TWI263550B - Method for controlling flow of molten steel in mold, apparatus therefor and method for producing continuously cast product - Google Patents

Abstract

When a velocity (u) of molten steel at the surface of molten steel bath in the mold is more than powder entrapping critical velocity of 0.32 m/sec, shifting magnetic field is applied to a stream poured from the immersion nozzle to control the velocity (u) of molten steel within the predetermined range. When the velocity (u) of molten steel is less than inclusion adhering critical velocity of 0.20 m/sec and skinning critical velocity of 0.10 m/sec or more, shifting magnetic field is applied to the stream so as to rotate the molten steel horizontally and to control the velocity (u) of the molten steel within the range of 0.20-0.32 m/sec. When the velocity (u) of the molten steel is less than the skinning critical velocity, shifting magnetic field is applied to the stream so as to accelerate the velocity of the molten steel and to control the velocity (u) of the molten steel within the range of 0.20-0.32 m/sec.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control method and a flow control device for molten steel in an ingot mold of a continuous casting machine for a billet, and a method for producing the billet ingot using the same. [Prior Art] As one of the qualities required for a slab ingot cast by a slab continuous casting machine (hereinafter simply referred to as "cast sheet"), it is considered that there is less inclusion in the surface layer of the ingot. The inclusions caught in the surface layer of the ingot sheet are (1): a deoxidation product generated in a deacidification step of a molten steel material such as A1 (aluminum), suspended in a molten steel material; (2): Ar (argon) gas bubbles blown into the molten steel by the intermediate flow tank and the dip nozzle; and (3): the cast powder scattered on the molten steel surface in the ingot mold is taken up into the molten steel Become a survivor, etc. These are all surface defects on steel products, so it is particularly important to reduce these. Among them, as a method of reducing deoxidation products and Ar gas bubbles, a moving magnetic field is applied to the molten steel in the ingot mold, the molten steel in the ingot mold is rotated in the horizontal direction, and the molten steel is supplied to the interface of the molten steel. The flow rate is used to wash the solidification interface to prevent the inclusion of inclusions. A specific magnetic field application method for rotating the molten steel in the ingot mold in the horizontal direction is to move the magnetic field horizontally along the longitudinal direction of the ingot mold in opposite directions along the opposite long sides. In the present specification, the application method is called "EMRS", "EMRS mode" or 6 312 / invention specification (supplement) / 92, in order to induce a flow similar to the molten steel flowing in the horizontal direction along the solidification interface. -05/92104189 1263550 "Electromagnetic rotative stirring by EMRS mode" (E Ivl RS : e ] ectromagnetic rotative stirring). As an example of the technique, Japanese Patent Laid-Open No. 1 and Japanese Patent Publication No. 2 are cited. However, in the application of the magnetic field by the EMRS mode, since the swirling flow is also supplied to the molten steel surface in the ingot mold, the flow rate of the molten steel discharged from the dipping nozzle itself is increased in the case of increasing the casting speed, casting The flow rate of the molten steel at the level of the molten steel in the ingot mold also increases. Therefore, if applied in this state by the EMRS mode, the molten steel flow rate at the molten steel level in the ingot mold will further The speed is increased, which causes the entrainment of the cast powder. On the other hand, since the entrainment of the cast powder is generated in the case where the flow rate of the molten steel in the molten steel surface in the ingot mold is increased, therefore, as a method of reducing this, application can be applied for the impregnation nozzle. The discharge flow is a moving magnetic field that supplies a braking force, thereby reducing the flow rate of the molten steel in the molten steel surface of the ingot mold. A specific magnetic field application method for supplying a braking force to the discharge flow from the submerged nozzle is a magnetic field that moves horizontally along the longitudinal direction of the ingot mold from the short side of the ingot mold toward the side of the dip nozzle (also That is, it moves in a direction opposite to the discharge direction of the immersion nozzle, and is used to induce a method of applying a flow of molten steel similar to the supply pressure of the molten steel discharge flow. In the present specification, the application method is called "EMLS", "EMLS". Mode" or "EMLS · electromagnetic level stabilizer/sl o wing-down. In the case of applying a magnetic field in EMLS mode, even in the case of a fast casting speed (ie, per unit time) In the case of a large amount of molten steel injection), also 7 312 / invention specification (supplement) / 92-05 / 92104189 1263550 can attenuate the molten steel flow rate of the molten steel surface in the ingot mold, thus preventing the casting powder As an example of the technique, Japanese Patent Document 3 and Japanese Patent Document 4, etc. are mentioned. However, the casting speed is not fast and does not occur. In the casting condition of the molten powder caused by the molten steel stream of the molten steel surface in the ingot mold, since the flow rate of the molten steel along the solidification interface is also small, when applied in the EMLS mode in this state When the molten steel flow rate along the solidification interface is further decelerated, deoxidation products and easy-adhering Ar gas bubbles are generated. (Patent Document 1) Japanese Patent Publication No. 5 - 3 2 9 5 94 (Japanese Patent Literature) (2) Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The problem to be solved by the invention) However, in the conventional f-seeking red mold according to any of the EMLS mode or the e MRS mode; the t-grain steel material flow control method has a wide range of speeds. The present invention has been made in view of the above circumstances, and its object is to provide a cast lens table which can be obtained regardless of the casting speed during continuous casting of steel. 3] 2 / invention manual (supplement) /92-05/92104189 8 1263550 Flow control method and flow control device for molten steel in ingot mold with small amount of inclusions and good quality ingots, and manufacture of continuous casting ingots using the same The present invention has been deliberately reviewed in order to solve the above problems. Hereinafter, the contents of the review will be described in detail. First, the conventional techniques are arranged. As a result, it is found that on the high speed side of the casting speed, the EMRS mode is The effect of the magnetic field application is reduced, and conversely, on the low speed side of the casting speed, the effect of the magnetic field application of the EMLS mode is reduced. Here, it is judged whether or not the object to be moved, such as the entrapment of the cast powder in the ingot mold, is to be subjected to the determination of the moving magnetic field, or whether it is necessary to melt the molten steel material at the molten steel level in the ingot mold. The flow rate is judged. For this, the flow rate of the molten steel in the molten steel level in the ingot mold was investigated. Figure 1 shows the results. Fig. 1 is a view showing the casting ingots having a thickness of 22 mm and a width of 1 000 mm under the casting conditions of the three types of conditions 1 to 3 shown in Table 1 by numerical simulation. When the billet is ingot, the result of the distribution of the molten steel flow rate of the molten steel surface in the ingot mold along the central portion of the ingot mold thickness (that is, the width of the ingot mold in the central portion of the ingot mold thickness) Figure. In this case, none of the cases 1 to 3 were applied with a magnetic field. Further, Fig. 1 shows the results of measuring the flow rate of the molten steel at the molten steel level at three points in the width direction of the ingot mold in the practical machine, in the casting conditions of Case 2 and Case 3. In the figure, the symbol • indicates case 2, and the symbol 〇 indicates case 3. The measurement of the flow rate of the molten steel of the utility machine is based on the use of a thin rod of Μ 〇 - Z r Ο 2 cermet, with the upper end of the rod as the pivot point 9 W invention specification (supplement) / 92-05/921 〇 4189 1263550 Impregnated in (4) in-mold_medullary liquid level, by (4) (4) receiving the resistance of the molten steel stream and tilting the angle of the calculation of the force of the exchange, the method of obtaining the molten steel flow rate is carried out (refer to the Japanese literature iron and Steel, 8 6 (2 0 0 0), ρ271). Further, the table i - 倂 shows f 后 which will be described later. [Table 1] Prayer speed (m / min) F値 Impregnation nozzle Ar gas blown Case 1 2.8 5.1 Case 2 2 . 2 3.6 1 0NI/min Case 3 1.7 2.4

As shown in Fig. 1, it can be seen that the results of the numerical simulation of the fluid are very consistent with the results of the flow rate measurement of the practical machine. According to the numerical simulation results, the flow velocity of the molten steel in the width direction of the ingot mold is separated from the short side of the ingot mold. 5 〇mm~ 100 mm position (the following table is not "near the short side of the ingot mold"), which is the fastest. Further, it can be seen that if the casting speed (i.e., the casting flow rate per unit time of the molten steel) is increased or decreased, the flow rate of the molten steel near the short side of the ingot mold is increased or decreased in proportion thereto, and in the same manner, the ingot mold The flow rate of the molten steel at other positions in the width direction is also increased or decreased. Thus, it can be seen that the flow rate of the molten steel near the short side of the ingot mold for melting the molten steel surface in the ingot mold greatly changes with the casting conditions, so that the strength of the molten steel flowing in the ingot mold can be understood. The indicator used. As a result, it has been found that the state in which the moving magnetic field is to be applied can be sufficiently determined by using the flow rate of the molten steel in the ingot mold near the short side of the ingot mold as an index in a state where no magnetic field is applied.

In the case of application in the EMRS mode, it is known that generally, as the flow rate of the molten steel at the solidification interface is increased, the effect of preventing the adhesion of the inclusion by the cleaning effect of the EMRS is large. That is, it is known that the inclusions captured by the solidified shell are solved by E M R S 10 312 / invention description _ patch) / 92-05 / 92104189 1263550

As the flow rate at the solidification interface increases, the amount and the number decrease. The inclusion star captured also investigated the threshold flow rate of the attached inclusions (hereinafter referred to as "inclusion attachment flow rate"). As a result, it was confirmed that the flow rate of the molten steel in the vicinity of the short side of the ingot mold of the liquid crystal in the sharp mold was reduced to 0.20 m/sec or more, which became the cause of defects on the surface of a general steel product. The inclusions above the diameter of 1 0 0 # m are not captured by the solidified shell. That is, it was confirmed that the flow rate of inclusion adhesion was 〇 2 〇 m / sec. However, 疋 'in the case of 纟 造 速度 , , , , , , , , ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' The supply amount of the molten steel having a high temperature is reduced. In the EMRS, since the molten steel is horizontally rotated, the effect of promoting the renewal of the molten steel near the molten steel surface in the ingot mold is less, and conversely, the melting of the molten steel in the ingot mold is promoted. The average temperature of the steel material drops. Accordingly, in the case where the casting speed is as low as a minimum or less, there is a case where the molten steel surface is melted in the ingot mold to cause skin sticking, and the powder accompanying this occurs. Here, the inventors of the present invention conducted a test for changing the flow rate of the molten steel in the molten steel surface of the ingot mold, and investigated the threshold flow rate (hereinafter referred to as "liquid surface coating flow rate"). . As a result, it is understood that the flow rate of the molten steel near the short side of the ingot mold of the molten steel in the ingot mold is less than 0.10 m/sec, even if the magnetic field is applied by the EMRS mode, the ingot mold The tendency of the inner molten steel to induce skinning is still high. That is, the exact 11 312 / invention specification (supplement) / 92-05 / 92104189 1263550 recognizes that the liquid surface is limited to a flow rate of 〇 · 1 Om / sec. In such a case 5, it is preferable to apply a moving magnetic field in a manner from the immersion acceleration force. By accelerating the discharge flow rate by force, the rising of the molten steel into the ingot mold can be increased, and the molten steel in the molten steel surface of the ingot mold can be accelerated to accelerate the molten steel in the ingot mold. The melting of the liquid surface satisfies both the prevention of the skin and the adhesion of the inclusions. The method of applying the discharge flow from the immersion nozzle is to make the long field along the ingot mold from the side of the immersion nozzle to the short side of the mold. The direction in which the side stain nozzles are ejected in the same direction, and the molten steel material discharge flow is supplied to the molten steel in the specification of the molten steel, and the application method is called "EMLA", and the electromagnetic field is applied by the EMLA mode (EMLA: accelerating) ° by In the EMLA mode, the magnetic field is applied, and since the outflow collides with the short side of the ingot, the molten steel which is in the direction of the diverging steel side toward the immersion nozzle side in the upward diverging portion along the branch, "spit flow-short side" The circulating flow of the side upflow-melted steel stream. The inventors of the present invention have confirmed that the solid interface can maintain the adhesion prevention of the inclusions as the adhesion of the inclusions to the solidified casing 312/invention description (supplement)/92-05/92104189 The amount of molten steel after the discharge of the spit outflow accelerates the collision with the short side of the ingot mold, not only the renewal of the material, but also the flow rate of the steel, and therefore, can be prevented. The direction of the magnetic direction in which the specific magnetic edge direction is horizontally moved, that is, the application method similar to the immersion induction for the melt flow, the "EMLA mode" or the "electromagnetic level accelerates the discharge flow, so the short side of the spit is faced. The upper and lower direction surfaces are flowed from the surface of the short side of the ί & & E 模 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 12 1263550 EMLA can be used instead of the above Ε μ rs. On the other hand, it is known that the entrainment of the cast powder occurs as the flow rate of the molten steel in the molten steel level in the ingot mold increases. Then, the inventors of the present invention conducted a test for changing the flow rate of the molten steel in the molten steel surface of the ingot mold, and investigated the inflow velocity of the cast powder (hereinafter referred to as "the casting powder is involved in the threshold flow rate"). . As a result, it was confirmed that if the flow rate of the molten steel near the short side of the ingot mold for melting the molten steel surface in the ingot mold exceeds 0.3 2 m/sec', the casting powder is involved. That is, it was confirmed that the casting powder was involved in a threshold flow rate of 〇.32 m/sec. In addition, it is confirmed that if the flow rate of the molten steel in the molten steel surface of the ingot mold is between the casting powder and the flow rate of the inclusion and the flow rate of the inclusions, the quality of the ingot is stable, in particular, When the flow rate of the molten steel near the short side of the ingot mold was 0.2 5 m/sec, the casting powder was minimized and the inclusion of the inclusions in the solidified shell was the least. In other words, it was confirmed that it is preferable to maintain the flow rate of the molten steel near the short side of the ingot mold of the molten steel level in the ingot mold at 〇·25πι/sec. Hereinafter, the flow rate 最 which is the most desirable in the present invention is referred to as "optimal flow rate 値". According to these results, it was found that the flow rate of the molten steel which melts the molten steel surface in the ingot mold by setting the boundary of the flow rate of the molten steel is faster than the casting powder is wound into the threshold flow rate, and is applied in the EM LS mode. The magnetic field prevents the entrainment of the cast powder, and the flow rate of the molten steel in the molten steel surface in the ingot mold is delayed compared to the flow rate of the inclusion adhesion threshold, and the magnetic field is applied in the EMRS mode or the EMLA mode to maintain the solidification interface. Melting the flow rate of the steel to prevent the inclusion of inclusions, can be cast in a wide range of casting speeds. 13 312 / invention instructions (supplements) / 92_〇 5 / 921 〇 4189 1263550 is a good surface quality ingot sheet. Moreover, it was found that the flow rate of the molten steel in the molten steel surface in the casting mold was lower than the flow rate of the liquid surface, and the molten steel was melted in the ingot mold by applying a magnetic field in the EMLA mode. The molten steel is updated 'at the same time, maintaining the molten steel flow rate in the molten steel in the ingot mold' to cast a better surface quality ingot over a wide range of casting speeds. In addition, it was found that even if the flow rate of the molten steel in the molten steel surface of the ingot mold is between the optimum flow rate and the casting powder is involved in the confined flow rate, the surface velocity of the molten steel is made by applying a magnetic field in the EMLS mode. Nearly the optimum flow rate 値' can still cast ingots with better surface quality. Similarly, it is found that even if the molten steel flow rate of the molten steel surface in the ingot mold is flown, the inclusion flow rate and the most Between the good flow rates, by applying a magnetic field in the [gMrs mode or the EMLA mode, the molten steel surface flow rate is close to the optimum flow rate 値', and a better surface quality ingot can still be cast. There are many methods for obtaining the flow rate of the molten steel in the molten steel surface in the ingot mold in a state where no magnetic field is applied, and in this case, it is preferable to quote a handcuff or the like (refer to Japanese literature Iron and Steel, 7 9 (i 9 9 3 ), p 5 7 6 ) The proposed liquid level fluctuation index (hereinafter referred to as "F値") indicating the change in the liquid level in the ingot mold. The F 値 is represented by the following formula (5), and it is understood that the magnitude of the fluctuation of the liquid surface obtained from ρ 形成 is proportional to the flow rate of the molten steel in the molten steel surface of the ingot mold. Accordingly, in the calculation of the flow rate of the molten steel in the molten steel level, the molten steel flow rate 机器 on the machine can be estimated by using F値. Only 値=/? · · Fe · [(Ksin0 )/4] · (1/D)...(5)

312/Invention Manual (Supplement y92_05/92104189 H 1263550 Here, as a formula representing the flow rate of the molten steel in the molten steel surface in the ingot mold, the following formula (4) which deforms F値 is used. Based on the casting conditions, the following formula (4) can be used to estimate the flow rate of the molten steel in the molten steel surface of the ingot mold. The equation (4) is used to represent the molten steel near the short side of the ingot mold. The formula of the proposed formula for the flow rate. u = k · p · QL · Ve · [(l-sin6))/2] · (1/D) *··(4) However, in (4) And in the formula (5), u is the flow rate of the molten steel in the molten steel surface of the ingot mold [that is, the surface velocity of the molten steel (m / sec)], k is a coefficient, and P is the density of the molten steel ( Kg/m3), QL is the injected amount of molten steel per unit time (m3/sec), and Ve is the velocity (m/sec) when the molten steel discharge flow collides with the short side of the ingot mold, and 0 is melting. The angle (deg) formed by the horizontal position of the position where the steel material discharge flow collides with the short side surface of the ingot mold, and D is the position where the molten steel discharge flow collides with the short side surface side of the ingot mold to melt in the ingot mold. Steel level The distance (m) so far. In addition, the type of the molten steel solution in the ingot mold is generated from the amount of movement of the upward flow formed by separating the molten steel discharge flow that collides with the short side of the ingot mold into the upper and lower directions. The experimental formula derived from the experimental results of the rise and liquid level fluctuations is derived as follows. In other words, the amount of molten steel injected from the dipping nozzle having the two discharge holes at the lower side toward the short side of the one-side ingot mold is Q "2 °, and when the collision speed is short on the short side of the ingot mold. 'The amount of movement of the molten steel spitting out flow at the time of conflict becomes the molten steel flow system after the collision of P QL^e/2 ° with (向-sin Θ )/2 upward and (l+sin) The ratio of 0)/2 is assigned. According to this, the amount of movement of the upward molten steel stream after the conflict is represented by (p Q l Ve / 2 ) X ( si η 0 ) / 2. 312/Inventive Manual (Supplement)/92-05/921 (Μ 189 1263550 The movement is carried out in the case of the increase in the flow of the steel in the Shibuya Steel and reaching the level of the molten steel. For this reason, it is considered to melt the steel. The amount of movement that the flow has when it reaches the molten steel level is 'normally the amount of movement that is retained in the conflict. η is about])) According to this, the molten steel is raised in the ingot mold. Straight 'has the amount of motion shown in (5) above. Speed (ve), angle (0), and distance (D) can be derived from another regression In order to confirm the validity of the formula (4), in a practical machine, the flow rate of the molten steel near the short side of the ingot mold of the molten steel surface in the ingot mold is actually measured. Fig. 2 shows the result. 2 is a graph showing the relationship between the flow rate of the molten steel in the ingot mold near the short side of the ingot mold measured in the practical machine, and the F値 calculated from the casting conditions at this time. The measurement is the use of the discharge hole angle. It is an impregnation nozzle with an annular bottom which is 45° downward and has a hole shape of 88 mm, and has a casting speed of 2,200 mm and a twist of 1 5 5 at a casting speed of 1.4 m/min to 2.1 m/min. The result of the ingot tablet of 0 mm~1 600 mm. As is apparent from Fig. 2, in the actual measurement results of the practical machine, the flow velocity of the molten steel in the ingot mold near the short side of the F値 and the ingot mold Having a good proportional relationship, that is, it can be known that the flow rate of the surface of the molten steel in the ingot mold according to the formula (4) can be estimated. Therefore, the inventors confirmed the flow velocity on the surface of the F 値 and the molten steel. Between (u), "melted steel surface flow velocity u (m / s) = 0.0 7 4 XF値" relationship, which is consistent with all casting conditions. From this relationship, the above-mentioned cast powder is involved in a confined flow rate (= 〇.3 2 m/sec), an optimum flow rate 値 (= 0.2 5 m/sec), an inclusion adhesion threshold flow rate (= 0.2 0 m/sec), and The liquid surface is limited to the flow rate (=0.10 m / sec), all can be represented by F ,, for the 16 312 / invention manual (supplement) / 92-〇 5 / 921 〇 4189 1263550 should be _ powder roll The F値 of the flow rate into the threshold (hereinafter, referred to as “casting powder involved in the threshold F値”) becomes 4.3, which corresponds to the optimum flow rate 値 (the following is 'the best F値').値 値 而 而 値 値 値 値 値 値 値 値 値 値 値 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( Face-to-face skin limit F値”) became 1. 4 Accordingly, even if F値 is not converted to the molten steel flow rate by using the above formula (4), the flow of the glutenized steel in the f# mold can be directly controlled. In order to control the flow of the molten steel in the ingot mold by moving the magnetic field, it is necessary to set the magnetic field strength to a predetermined intensity. In the present invention, the magnetic field strength is set as follows. The moving magnetic field which causes the molten steel in the ingot mold to rotate in the horizontal direction, that is, the E MRS intensity, can be obtained by the following method. The Lorentz (L 〇 r e n t z ) force F per unit volume acting on the molten steel is represented by the following formula (6). However, in the formula (6), σ is the electrical conductivity of the molten steel 'R is the relative velocity of the molten steel and the magnetic field, and Β is the magnetic flux density. F X σ · R · B2 (6) The work Q formed when the Lorentz force ρ acts on the molten steel of the volume Z is expressed by the following formula (7). However, in the formula (7), r is the pole pitch of the moving magnetic field generating device, f is the input current frequency for the moving magnetic field generating device, and ρ is the density of the molten steel. Q = F · Ρ * ζ = ^ · 2γ · f · β2 · ρ · Ζ (7) If the work Q is converted to the kinetic energy of the molten steel without regard to the loss, 17 312 / invention specification (supplement) / 92 -05/92104189 1263550 The following formula (8) can be obtained. If the equation (8) is solved for the relative velocity R of the molten steel and the magnetic field, the following formula (9) can be obtained. 1/2 · P · Z · · 2 r . f · Β2 · ρ · z .·· (8) 7? = / (4 · τ · σ · f · b) ··· (9) On the ' Between the moving speed of the moving magnetic field and the moving speed of the molten steel to be driven, since there is also slip, if the coefficient 7 determined by each device is considered, the formula (9) is as follows (i) Expressed by the formula. That is, in the case where the moving magnetic field is applied by the EMRS mode, it is preferable that the magnetic flux density B determined by the following formula (1) is the applied moving magnetic field. R = Y · B · (1) Further, the moving magnetic field for supplying the acceleration force to the discharge flow from the submerged nozzle, that is, the EMLA intensity can be obtained by the following method. Under the condition of the relative speed R of the molten steel and the magnetic field, the magnetic field of the magnetic flux density B is applied to the molten steel having the density p and the electrical conductivity C7, and the Lorentz force F per unit volume of the molten steel is used. It is represented by the above formula (6). In the case where the Lorentz force F is applied only during the period Δt, the absolute 値Δu of the amount of change in the speed of the molten steel is expressed by the following formula (1 〇). Z\ u = (σ · R . B2 / ρ ) · △ t ...(10)

Here, when the molten steel surface flow rate in the state where EMLA is not applied is set, the average 値 in the width direction of the ingot mold along the linear velocity of the molten steel discharge flow from the discharge nozzle of the immersion nozzle is set to be U. , the flow rate of the molten steel after the application of μ LA is u !, and the average 値 in the width direction of the ingot mold along the linear velocity of the molten steel discharge flow is u 1, and the EMLA 18 312 / invention is set. In the specification (supplement)/92-05/92104189 1263550, the moving speed of the magnetic field is L, and the relative velocity of the magnetic field seen from the spitting flow is (L - U.). At this time, the rate of change of velocity Αν of the molten steel surface flow velocity by E M L A is expressed by the following formula (1 1 ).

Av = u ] /u 0〇c(U 〇+ Δ U) / U 〇= 1^((7//^) - (L - U 〇) / U 〇* B ~ r △ t .'*(11 Here, when the ratio of the flow velocity m of the discharge flow and the width w of the ingot mold represents time Δt, the speed change rate Αν is as follows (1 2). Αν = ] + (σ/ ^ ) ^ (L - U 0) / U 0 · Β2 · (W/U 〇) (12) Further, if ε = (σ / ρ ) · W, the speed change rate Αν becomes the following equation (2). In the case where a moving magnetic field is applied by the EMLA mode, it is preferable to apply a moving magnetic field by the magnetic flux density Β determined by the following formula (2).

Av = J+ s · (L- U0) / U02 · B2 (2) The inventors have investigated whether or not the formula (2) is actually established in the actual machine. The investigation phase changes the input current of the EMLA step by step, and uses the aforementioned method for measuring the flow rate of the molten steel, that is, the Μ-Zr Ο 2 cermet fine rod is immersed in the molten steel by receiving from the thin rod. The angle at which the resistance of the molten steel stream is inclined, and the method of obtaining the flow rate of the molten steel is carried out. The casting conditions at this time are the ingot piece thickness of 250 mm, the ingot piece width of 1 18 6 mm, the casting speed of 1.0 m/min, and the Ar gas insufflation amount blown into the dip nozzle by 1 2 N] / min' The dip nozzle is inclined downward by 25 using the discharge port. One side is a corner hole of 8 5 m m. Η 3 Fu can not obtain the relationship between the input current of £ μ l A and the surface flow velocity of the molten steel. In addition, Figure 4 shows that the vertical axis is the velocity change rate of the formula (2) Av 'the horizontal axis is (L- U .) / U. 2 · B2 and investigate the relationship between the two 19 312 / invention manual (supplement) / 92-05 / 921 〇 4189 1263550 results. Here u'. It can be obtained by averaging the discharge flow rates obtained by the equation (1 3 ) described later using the process of calculating the flow rate u of the molten steel surface from F 在 in the width direction of the mold. As shown in Fig. 4, from the case where the curve in Fig. 4 falls on a straight line, it is understood that the relationship of the formula (2) also holds in the application of the E M L A of the actual machine. The inclination of the approximate straight line in Fig. 4 corresponds to £ of the formula (2). According to this, if the same test is performed with a plurality of ingot mold widths and ε in the width of each ingot mold is obtained, the magnetic flux density of the EMLA corresponding to the necessary acceleration rate Αν can be calculated from the formula (2). . In addition, it is preferable to use the following formula (3) which is not disclosed by Japanese Patent No. 3125665 of the present inventors, for example, the moving magnetic field to which the braking force is supplied from the immersion nozzle, that is, the EM L S intensity. However, in the formula (3), Rv is a positive number 値 showing the flow rate of the molten steel from the short side of the ingot mold toward the side of the immersion nozzle, and the flow rate of the molten steel in the opposite direction is shown by a negative number ,. The surface velocity of the molten steel in the ingot mold when the moving magnetic field is applied is used as a denominator, and the surface flow velocity of the molten steel in the ingot mold when the moving magnetic field is applied by the magnetic flux density B is taken as a molecular ratio, wherein /3 is The coefficient, B is the magnetic flux density (tes 1 a ) of the moving magnetic field, V. The linear velocity (m/sec) of the flow of the molten steel discharged from the spout nozzle discharge port.

Rv^l - /9 · Β4/V〇 (3) In this case, the target flow rate after EMLS application of the molecule of Rv of the formula (3) should be substituted, and it is preferable to refer to Japanese Patent No. 3 according to the present inventors. The flow rate disclosed in 1 2 5 6 6 No. 4. That is to say, in a positive number, the flow rate of the molten steel from the short side of the ingot mold toward the side of the impregnation nozzle is shown as negative 20 312 / invention specification (supplement) / 92 - 〇 5 / 92104189 1263550 When the flow rate of the molten steel in the opposite direction is displayed, the molten steel of the molten steel level at the center of the thickness of the ingot of the ingot mold is only a quarter of the width of the ingot mold from the short side of the ingot mold. Material flow rate, controlled at -0. 0 7 m / sec ~ 0. In the range of 0 5 m / sec. ^ Here, the matter to be noted means that the flow rate of the molten steel in the above position after the application of E M L S is -〇.  〇 7 m / s ~ 0. 0 5 m / sec, as the flow rate enthalpy, is lower than the casting powder is involved in the threshold flow rate, and is also lower than the inclusion adhesion threshold flow rate and the liquid surface skinning limit flow rate when no magnetic field is applied. However, the inventors of the present invention have confirmed the flow rate of the solidification interface on the side where the inclusions are attached, and it is necessary to maintain the adhesion prevention to the inclusions as needed, and to maintain the heat supply to the molten steel surface in the ingot mold as needed. Moreover, the skin of the molten steel liquid surface is not produced. The reason for this is because the molten steel flow pattern in the ingot mold has a large difference in comparison with the case where the magnetic field is not applied in the case where EMLS is applied. Specifically, as shown in FIG. 5, in the case where no magnetic field is applied, a liquid surface forming molten steel stream 2 1 formed by melting the steel material discharge stream 4 and a solidification interface formed along with the flow are formed. The interface melts the steel stream 22, but with the application of EMLS, the original liquid surface formed by the molten steel discharge stream 4 before the EMLS is applied, the molten metal stream 2 1 is formed and applied by EMLS The molten steel stream formed by the molten molten steel stream forms a downward direction of the molten steel stream 2 3 in the opposite direction, and the flow rate of both of the molten steel streams is balanced by the balance, so that one quarter of the width of the ingot mold The flow rate of the molten steel material immediately below the liquid level at the central portion of the ingot piece thickness near the short side of the ingot mold is about 〇m/sec. 21 312/Invention Manual (Supplement)/92·〇5/921 〇4189 1263550 Thus, at this time, the molten steel discharged from the EMLS is applied to discharge the stream 4, and the divergence is performed by using the long side of the edge_red mold. The resulting interface along the solidification interface melts the steel stream 24, maintains the molten steel flow rate at the solidification interface, and 'also maintains a heat supply to the molten steel level. Further, Fig. 5 is a schematic view showing the flow of molten steel in the ingot mold, Fig. 5 (A) is a view showing that no magnetic field is applied, and Fig. 5 (B) is a view showing a state of application of e M L S . The component symbol 1 1 in the figure is an immersion nozzle. The present invention has been completed on the basis of the above-mentioned review results. Therefore, the flow control method for the molten steel in the ingot mold of the invention is to apply a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the steel billet to control A method for melting a molten steel in an ingot mold, characterized in that the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the flow rate of the molten powder in the impregnation flow, and the braking force is supplied to the discharge flow of the impregnation nozzle The method of applying a moving magnetic field to control the flow rate of the molten steel in the molten steel surface of the ingot mold to the specified molten steel flow rate, and the flow rate of the molten steel in the molten steel surface in the ingot mold is less than the inclusion of inclusions. When the flow rate is limited, the moving magnetic field is applied in such a manner as to increase the flow of the molten steel in the ingot mold, and the flow rate of the molten steel in the molten steel surface of the ingot mold is controlled to be above the flow rate of the inclusion adhesion limit, and The cast powder is involved in the range below the threshold flow rate. The flow control method of the molten steel in the ingot mold of the second invention is a method for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the steel billet to control the flow of the molten steel in the ingot mold, characterized in that When the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the flow rate of the molten powder into the threshold flow, the movement is applied in such a manner as to supply the braking force to the discharge flow of the submerged nozzle 22 312 / invention specification (supplement) / 92 -05/92104189 1263550 Field 'The flow rate of the molten steel in the molten steel surface of the ingot mold is controlled at the flow rate of the molten steel of the finger, and the molten steel in the molten steel surface in the ingot mold is not full. When the inclusion adheres to the limited flow rate, the moving magnetic field is applied by rotating the molten steel in the ingot mold horizontally, and the flow rate of the molten steel in the molten steel surface of the ingot mold is controlled to be above the flow rate of the inclusion adhesion limit. And while praying the powder is involved in the range below the threshold flow rate. A flow control method for molten steel in an ingot mold according to a third aspect of the invention, characterized in that, in the second aspect of the invention, when a moving magnetic field is applied to rotate the molten steel in the ingot mold in a horizontal direction, the movement is performed. The magnetic flux density of the magnetic field is the magnetic flux density determined by the above formula (1). The flow control method of the molten steel in the ingot mold of the fourth invention is a method of applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine to control the flow of the molten steel in the ingot mold, The method is characterized in that when the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the flow rate of the casting powder, the moving magnetic field is applied in such a manner as to supply the braking force to the discharge flow of the submerged nozzle, and the molten steel is melted in the ingot mold. The flow rate of the molten steel at the liquid level is controlled at the specified molten steel flow rate, and the flow rate of the molten steel flowing in the molten steel surface of the ingot mold is less than the flow rate of the inclusion adhesion limit, and the supply of the discharge flow to the submerged nozzle is accelerated. The force magnetic field applies a moving magnetic field to control the flow rate of the molten steel in the molten steel surface of the ingot mold above the flow rate of the inclusion adhesion limit, and in the range where the multi-seeking powder is wound below the threshold flow rate. According to a fourth aspect of the invention, in the fourth aspect of the invention, the magnetic field of the moving magnetic field is applied when a moving magnetic field is applied so that an acceleration force is supplied to the discharge flow of the submerged nozzle. Density specification 312 / invention specification (supplement) / 92-05 / 921 (Μ 1S9 23 1263550 is the magnetic flux density defined by the above formula (2). The flow control method of the molten steel in the ingot mold of the sixth invention, In the first to fifth inventions, when the moving magnetic field is applied so that the braking force is supplied to the discharge flow of the immersion nozzle, the magnetic flux density of the moving magnetic field is defined as the magnetic flux density determined by the above formula (3). The invention discloses a flow control method for molten steel in an ingot mold, characterized in that, in the inventions of the first to sixth inventions, the casting powder is required to be wound into a threshold flow rate of 0. 32 m / sec, the above-mentioned inclusion adhesion threshold flow rate is 〇 2 〇 m / sec. The flow control method of the molten steel in the ingot mold of the eighth invention is a method for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine for controlling the flow of the molten steel in the ingot mold, characterized in that When the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the flow rate of the casting powder, the moving magnetic field is applied in such a manner as to supply the braking force to the discharge flow of the submerged nozzle, and the molten steel in the sharp mold is melted. The flow rate of the molten steel is controlled at the specified molten steel flow rate. When the flow rate of the molten steel in the molten steel surface of the ingot mold is less than the flow rate of the inclusion adhesion limit, and the flow rate is higher than the liquid surface. Applying a moving magnetic field by rotating the molten steel in the ingot mold in a horizontal direction, and controlling the flow rate of the molten steel in the molten steel surface of the ingot mold to be above the flow rate of inclusion adhesion, while casting the powder roll In the range below the flow rate of the imminent flow rate, when the flow rate of the molten steel in the molten steel surface of the ingot mold is less than the flow rate of the liquid surface, the acceleration flow is applied to the discharge flow of the submerged nozzle. The dynamic magnetic field controls the flow rate of the molten steel in the molten steel surface of the ingot mold above the flow rate of inclusion adhesion, while in the casting powder 24 312 / invention specification (supplement V92-〇5/921 〇4189 l26355〇 And a flow control method of the molten steel in the ingot mold according to the ninth invention, characterized in that in the eighth invention, the molten material in the ingot mold is rotated in the horizontal direction When the moving magnetic field is applied, the magnetic flux density of the moving magnetic field is defined as the magnetic flux density determined by the above formula (1). The flow control method for the molten steel in the ingot mold of the first invention is characterized in that In the eighth or ninth aspect of the invention, when the moving magnetic field is applied so as to supply the acceleration force to the discharge flow of the immersion nozzle, the magnetic flux density of the moving magnetic field is defined as the magnetic flux density determined by the above formula (2). A flow control method for molten steel in an ingot mold according to the invention, characterized in that in the eighth to tenth invention, when a moving magnetic field is applied in such a manner that a braking force is supplied to a discharge flow of the submerged nozzle, the magnetic flux of the moving magnetic field is applied dense The magnetic flux density defined by the above formula (3) is defined by the flow control method of the molten steel in the ingot mold according to the first aspect of the invention, wherein the casting powder is involved in the invention according to the eighth to eleventh invention. The flow rate is limited to 0. 3 2 m / sec, the above-mentioned inclusion adhesion threshold flow rate is specified as 〇. 20 m / s, the above liquid level is specified to be 0.  1 0 m / sec. The flow control method of the molten steel in the ingot mold of the first invention is a method for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the steel billet to control the flow of the molten steel in the ingot mold, and the characteristics thereof In order to melt the molten steel in the ingot mold, the flow rate of the molten steel exceeds the minimum flow rate of the cast powder, and the optimum flow rate for the inclusion of the inclusions in the solidified shell is minimized, and the discharge flow is supplied to the impregnation nozzle. The dynamic mode applies a moving magnetic field, and the flow rate of the molten steel in the molten steel surface in the ingot mold is less than the above-mentioned optimum flow rate 25 312 / invention specification (supplement) / 92-05 / 92104189 1263550 値The moving magnetic field is applied in a direction to rotate the molten steel in the ingot mold. The flow control method for the molten steel in the ingot mold of the first invention is a method for applying a magnetic field to the molten steel in the ingot mold of the steel continuous casting machine to control the flow of the molten steel in the ingot mold, It is characterized in that the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the minimum flow rate of the cast powder, and the optimum flow rate 对于 for the adhesion of the inclusions of the solidified shell is , The discharge flow is applied to the braking force to apply a moving magnetic field, and in the I# sharp mode, when the molten steel flow rate of the molten steel surface is less than the above optimum flow rate ', the acceleration force is supplied to the discharge flow of the immersion nozzle. Apply a moving magnetic field. A flow control method for molten steel in an ingot mold according to a fifth aspect of the invention, characterized in that in the thirteenth or fourteenth aspect, the optimum flow rate 値 is specified as 〇. 25 m/s. The flow control method of the molten steel in the ingot mold of the first invention is a method for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the steel billet to control the flow of the molten steel in the ingot mold, and the characteristics thereof In order to melt the molten steel in the ingot mold, the flow rate of the molten steel exceeds the minimum flow rate of the cast powder, and the optimum flow rate for the inclusion of the inclusions in the solidified shell is minimized, and the discharge flow is supplied to the impregnation nozzle. The dynamic mode applies a moving magnetic field, and the molten steel flow rate in the molten steel surface of the ingot mold is not higher than the above-mentioned optimal flow rate 値, and is higher than the liquid surface coating flow rate, and the casting mold is rotated in the horizontal direction. The way in which the molten steel is applied is to apply a moving magnetic field 'When the flow rate of the molten steel in the molten steel surface of the ingot mold is not full, the liquid surface is at the limit flow rate'. For the 26 312 / invention specification (supplement) / 92 -05/92104189 1263550 The discharge magnetic field of the immersion nozzle applies a moving magnetic field in such a manner as to supply an acceleration force. The flow control method of the molten steel in the ingot mold according to the seventeenth aspect of the invention is characterized in that, in the first invention, the optimum flow rate 値 is defined as 〇.  2 5 m / sec, the above-mentioned liquid surface skinning limit flow rate is specified as 〇. 1 〇 m / sec. The flow control method of the molten steel in the ingot mold according to the invention of the present invention, characterized in that, in the invention according to any one of the first to seventh aspect, the moving magnetic field is applied in such a manner that a braking force is supplied to the discharge flow of the submerged nozzle, and the control is performed. When the flow rate of the molten steel in the molten steel surface is increased in the ingot mold, the flow rate of the molten steel from the short side of the ingot mold toward the side of the impregnation nozzle is displayed in a positive number, and the molten steel in the opposite direction is displayed in a negative number The flow rate of the molten steel is the flow rate of the molten steel at the center of the thickness of the ingot which is only a quarter of the width of the ingot mold from the impregnation nozzle on the short side of the ingot mold, and is controlled at -0. . 07 m / s ~ 〇. Within the range of 05 m/s. A flow control method for molten steel in an ingot mold according to a nineteenth aspect of the invention, characterized in that, in the invention of any one of the first to eighteenth, when the moving magnetic field is applied, it is estimated by I: (4) The molten steel flow rate of the molten steel surface in the ingot mold in a state where no magnetic field is applied, and a specified moving magnetic field is applied based on the estimated molten steel flow rate. A method for controlling the flow of molten steel in an ingot mold according to the invention of the present invention, characterized in that, in the invention of the above-mentioned [9], the molten steel in the ingot mold is repeatedly estimated every time in the casting using the above formula (4) The flow rate of the molten steel at the liquid level will be applied to the specified moving magnetic field based on the estimated molten steel flow rate. The flow control method for the molten steel in the ingot mold of the second invention is to apply a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the steel billet to control 27 312 / invention specification (supplement) / 92-05 / 92104189 1263550 A method for the flow of molten steel in an ingot mold, characterized in that the F値 shown in the above formula (5) obtained from the casting condition exceeds the discharge flow of the impregnation nozzle when the casting powder is wound into the threshold F値A method of supplying a braking force applies a moving magnetic field. When the F値 is less than the inclusion adhesion threshold 値, the moving magnetic field is applied to rotate the molten steel in the ingot mold in the horizontal direction. According to a second aspect of the invention, in the second aspect of the invention, in the invention of the second aspect, when a moving magnetic field is applied to rotate the molten steel in the ingot mold in a horizontal direction, The magnetic flux density of the moving magnetic field is defined as the magnetic flux density determined by the above formula (1). The flow control method of the molten steel in the ingot mold of the second invention is a method for applying a magnetic field to the molten steel in the ingot mold of the steel continuous casting machine to control the flow of the molten steel in the ingot mold, It is characterized in that when the F 所示 shown in the above formula (5) obtained from the casting condition exceeds the casting powder by the impending ρ ,, the moving magnetic field is applied in such a manner that the braking force is supplied to the discharge flow of the immersion nozzle. When the object adheres to the threshold ρ , the moving magnetic field is applied so that the acceleration flow is supplied to the discharge flow of the immersion nozzle. According to a twenty-third aspect of the invention, in the second aspect of the invention, the moving magnetic field is applied when a moving magnetic field is applied to the discharge flow of the immersion nozzle. The magnetic flux density is defined as the magnetic flux density, g determined by the above formula (2). According to a second aspect of the invention, in the second aspect of the invention, the method of controlling the flow of the molten steel in the injecting flow to the immersion nozzle The magnetic flux density of the moving magnetic field is defined as the magnetic flux density determined by the above formula (3). 312/Inventive Manual (Repair)/92-〇5/921〇4189 28 1263550 Brother 2 6 Invented the flow control method of molten steel in the mirror sharp mold, the special force, the invention of any of the 2nd to 25th In the above, it is stipulated that the above-mentioned casting powder is involved in the limit F値 is 4, 3 ', and the above-mentioned inclusion adhesion threshold F値 is 2. 7. The flow control method of the melted steel in the ingot mold of the invention is applied to the molten steel in the ingot mold of the copper I continuous casting machine to apply a magnetic field to control the inside of the mold; the flow of the C-grain steel The method is characterized in that, when the F値 shown in the above formula (5) obtained from the casting condition exceeds the casting powder being wound into the threshold F値, the moving magnetic field is applied in such a manner that the discharge flow is sealed by the discharge flow of the submerged nozzle. When the above F値 is less than the adhesion of the inclusions and is higher than the surface of the liquid surface, the moving magnetic field is applied in such a manner that the molten steel in the ingot mold is rotated in the horizontal direction. The liquid level is applied to the discharge flow of the submerged nozzle to apply an acceleration magnetic field. According to a second aspect of the invention, in the second aspect of the invention, in the invention of the seventh aspect, when the moving magnetic field is applied by rotating the molten steel in the ingot mold in the horizontal direction, The magnetic flux density of the moving magnetic field is defined as the magnetic flux density determined by the above formula (1). According to a twenty-seventh or twenty-eighthth aspect of the invention, in the second aspect of the invention, the method of applying a moving magnetic field so as to supply an acceleration force to the discharge flow of the immersion nozzle The magnetic flux density of the moving magnetic field is defined by the magnetic flux density defined by the above formula (2). A method of controlling the flow of molten steel in a mold ingot according to the invention of claim 30, wherein in the invention of any one of the second to seventh aspects, the moving magnetic field is applied while the braking force is supplied to the discharge flow of the immersion nozzle The magnetic flux density of the moving magnetic _ 29 31W invention specification (supplement) / 92-05/921 〇 4189 1263550 is defined as the magnetic flux density determined by the above formula (3). The flow control method of the molten steel in the ingot mold of the invention of the invention is characterized in that, in any one of the inventions of the seventh to third aspects, the casting powder is required to be wound into the threshold F. 3. It is stipulated that the above-mentioned inclusion adhesion threshold F値 is 2.  7, the specified liquid surface skin limit F値 is]· 4. The method for controlling the flow of molten steel in an ingot mold according to the third invention is a method for applying a magnetic field to a molten steel in an ingot mold of a continuous casting machine for controlling the flow of molten steel in the ingot mold, and is characterized by the method In order to obtain the optimum F値 of the optimum flow rate 对应 corresponding to the minimum of the entrapment of the cast powder and the least adhesion to the inclusions of the solidified shell, the F 所示 shown in the above formula (5) obtained from the casting condition is The moving magnetic field is applied to the discharge flow of the immersion nozzle to supply the braking force, and when the F 値 is not the best F 上述, the moving magnetic field is applied to rotate the molten steel in the ingot mold in the horizontal direction. The flow control method of the molten steel in the ingot mold of the third invention is a method for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the billet to control the flow of the molten steel in the ingot mold, and the characteristics thereof In order to obtain an optimum F 所示 of the optimum flow rate 对应 corresponding to the minimum of the entrainment of the cast powder and the least adhesion to the inclusions of the solidified shell, the F 所示 shown in the above formula (5) obtained from the casting condition is The moving magnetic field is applied to the discharge flow of the immersion nozzle to supply the braking force. When the F 値 is not the best F 上述, the moving magnetic field is applied so that the acceleration flow is supplied to the discharge flow of the immersion nozzle. A method of controlling the flow of molten steel in an ingot mold according to a third aspect of the invention is characterized in that, in the invention of claim 3 or 3, the optimum F値 is 3. 4. The flow control method for the molten steel in the ingot mold of the 35th invention is 30 312 / invention description _ patch) / 92-05 / 92104189 1263550 Applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the billet A method for controlling the flow of molten steel in an ingot mold, characterized in that the F値 shown in the above formula (5) obtained from the casting condition exceeds the inclusion corresponding to the cast powder and the inclusions for the solidified shell When F 値 of the optimum flow rate 附着 with the least adhesion, the moving magnetic field is applied in such a manner that the braking force is supplied to the discharge flow of the immersion nozzle, and the F 値 is not the best F 上述, and is higher than the liquid surface 値 F 値At this time, a moving magnetic field is applied so as to rotate the molten steel in the ingot mold in the horizontal direction, and when the F値 is not filled with the liquid surface, the acceleration force is applied to the discharge flow of the submerged nozzle. Move the magnetic field. According to a third aspect of the invention, in the third aspect of the invention, the method for controlling the flow of the molten steel in the ingot mold is characterized in that, in the 35th invention, the optimum jr値 is 3.4, and the liquid level is limited to F 1 .  4. According to a third aspect of the invention, in the second aspect of the invention, the method of controlling the flow of the molten steel in the ingot mold, wherein the moving magnetic field is applied to the discharge flow of the immersion nozzle, When controlling the flow rate of the molten steel in the molten steel surface in the ingot mold, the flow rate of the molten steel from the short side of the ingot mold toward the side of the impregnation nozzle is shown in a positive number, and the melting in the opposite direction is shown by a negative number The flow rate of the molten steel, the molten steel flow rate of the molten steel level at the center of the thickness of the ingot sheet which is only a quarter of the width of the ingot mold from the impregnation nozzle away from the short side of the ingot mold, is controlled at - 0. 07m / sec ~ 〇 .  〇 5 m / s range. A flow control method for molten steel in an ingot mold according to a third aspect of the invention, characterized in that, in any one of the inventions 2 to 3, the F(値) is repeatedly calculated every time in the casting using the above formula (5) The specified magnetic field will be applied based on the calculated F 値 31 312 / invention specification (supplement) / 92-05 / 92104189 1263550. A flow control method for molten steel in an ingot mold according to a thirty-ninth aspect of the invention, comprising the steps of: obtaining a thickness of an ingot as a casting condition, a width of a tablet, a casting speed, and entering a molten steel material in the first step At least five conditions of the inert gas blowing amount and the shape of the immersion nozzle in the outflow hole; and the second step, calculating the flow rate of the molten steel in the molten steel surface in the ingot mold based on the obtained casting conditions; The calculated flow rate of the molten steel material is compared with the flow rate of the casting powder and the flow rate of the inclusions, and it is judged whether the flow rate of the molten steel exceeds the flow rate of the recorded powder and is lower than the flow rate. The inclusions adhere to the limited flow rate; and in the fourth step, when the obtained molten steel flow rate exceeds the casting powder being wound into the threshold flow rate, the moving magnetic field is applied in such a manner as to supply the braking force to the discharge flow of the submerged nozzle, and the obtained molten steel material is obtained. When the flow rate is less than the inclusion of the inclusion flow rate, the moving magnetic field is applied by rotating the molten steel in the ingot mold horizontally; for the ingot of the steel continuous casting machine Applied to the molten steel material specified shifting magnetic field to control the molten steel within the ingot mold material flow. A flow control method for molten steel in an ingot mold according to a 40th aspect of the invention, comprising the steps of: obtaining a thickness of an ingot piece as a casting condition, a width of a crucible tablet, a speed of insulting, and melting into a melting step; At least five conditions of the inert gas blowing amount and the shape of the immersion nozzle in the steel material outflow hole; the second step, calculating the flow rate of the molten steel material in the molten steel material surface in the ingot mold based on the obtained casting conditions, '3 In the step, the flow rate of the molten steel obtained by the calculation is compared with the flow rate of the casting powder, the flow rate of the inclusion adhesion limit, and the flow rate of the liquid surface. The determined flow rate of the molten steel exceeds the casting powder 32 3 ] 2 /Inventive manual (supplement)/92-05/921 〇4189 1263550 At the end of the flow rate, whether it is lower than the flow rate of inclusion adhesion threshold and whether it is lower than the liquid level of the liquid surface; and the fourth step, When the obtained molten steel flow rate exceeds the casting powder being wound into the threshold flow rate, the moving magnetic field is applied in such a manner as to supply the braking force to the discharge flow of the submerged nozzle, and the flow rate of the obtained molten steel is not full. And when the flow rate is higher than the liquid surface, the moving magnetic field is applied in a manner of rotating the molten steel in the ingot mold in the horizontal direction, when the obtained molten steel flow rate is not full, and the liquid surface is not limited to the liquid flow rate. The moving magnetic field is applied to the discharge flow of the immersion nozzle to supply the acceleration force; a specified moving magnetic field is applied to the molten steel in the ingot mold of the slab continuous casting machine to control the flow of the molten steel in the ingot mold. A flow control method for molten steel in an ingot mold according to the fourth aspect of the invention, characterized in that in the invention of the third or fourth invention, the steps 1 to 4 are repeatedly performed in casting for the time point The casting conditions apply the best moving magnetic field. The flow control device for melting molten steel in the ingot mold of the 42nd invention is a device for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the billet to control the flow of the molten steel in the ingot mold, characterized in that : a casting condition obtaining mechanism is provided to obtain at least five conditions of the thickness of the ingot, the width of the ingot, the casting speed, the amount of inert gas injected into the outflow hole of the molten steel, and the shape of the immersion nozzle as casting conditions; Calculating the flow rate of the molten steel in the molten steel surface of the ingot mold based on the obtained casting conditions; determining the mechanism, comparing the calculated flow rate of the molten steel with the casting powder into the threshold flow rate and the inclusion flow rate Determine whether the obtained molten steel flow rate exceeds the casting powder entrapped into the threshold flow rate, and whether it is lower than the inclusion attachment 33 312 / invention manual (supplement) / 92-05 / 92104189 1263550 临 丨 丨 speed i ί The mechanism applies a moving magnetic field in a manner that supplies a braking force to the discharge flow of the submerged nozzle when the obtained molten steel flow rate exceeds the casting powder being drawn into the threshold flow rate, When the obtained molten steel flow rate is less than the inclusion adhesion limit flow rate, the moving magnetic field is applied in such a manner that the molten steel in the ingot mold is rotated in the horizontal direction; and the moving magnetic field generating device generates a designation based on the output of the control mechanism The moving magnetic field. The flow control device for melting molten steel in the ingot mold of the fourth invention is a device for applying a magnetic field to the molten steel in the ingot mold of the steel continuous casting machine to control the flow of the molten steel in the ingot mold, The invention is characterized in that the casting condition obtaining means is provided, and at least five conditions of the thickness of the ingot piece, the width of the ingot piece, the casting speed, the amount of inert gas blown into the outflow hole of the molten steel, and the shape of the immersion nozzle are obtained as casting conditions; The calculation mechanism calculates the flow rate of the molten steel in the molten steel surface in the ingot mold based on the obtained casting conditions; the determining mechanism 'calculates the obtained molten steel flow rate and the casting powder into the threshold flow rate and the inclusion adhesion limit Comparing the flow rate and the flow rate of the liquid surface to determine whether the obtained molten steel flow rate exceeds the flow rate of the casting powder, whether it is lower than the flow rate of the inclusion adhesion limit, and whether it is lower than the flow rate of the liquid surface; The mechanism 'applies a moving magnetic force in a manner that supplies a braking force to the discharge flow of the submerged nozzle when the obtained molten steel flow rate exceeds the casting powder involved in the confined flow rate 'When the obtained molten steel flow rate is less than the flow rate of inclusion adhesion, and the flow rate of the liquid surface is applied to the liquid surface, the moving magnetic field is applied by rotating the molten steel in the in-situ mold in the horizontal direction. When the flow rate of the molten steel is not full, the moving magnetic field is applied in such a manner as to supply an acceleration force to the discharge flow of the submerged nozzle; and the moving magnetic field generating device 34 312/invention specification (supplement)/92-05 /92104189 1263550 Set, based on the output of the control mechanism 'generates the specified moving magnetic field. The flow control method of the molten steel in the ingot mold according to the fourth aspect of the invention, characterized in that, by the flow control method according to any one of the first to fourth inventions, the flow control of the molten steel in the ingot mold is performed, At the same time, the molten steel in the intermediate flow tank is injected into the ingot mold, and the solidified shell formed in the ingot mold is drawn downward to manufacture a billet ingot. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. 6 to 8 are schematic views of a slab continuous casting machine used in the practice of the present invention. Fig. 6 is a schematic perspective view of the ingot mold portion, Fig. 7 is a schematic front view of the ingot mold portion, and Fig. 8 is a schematic structural view of the magnetic field control device for controlling the applied magnetic field. In Figs. 6 to 8, the intermediate portion 7 is provided with a long side 7 of the ingot mold and a predetermined position above the ingot mold 6 of the opposite ingot mold side 8 which is built in the long side 7 of the ingot mold. The flow tank 9 is provided with an upper nozzle 16 at the bottom of the intermediate flow tank 9, and a sliding nozzle 1 composed of a fixed plate 17 and a sliding plate 18 and a rectifying nozzle 1 is disposed under the upper nozzle 16 Further, a dip nozzle 1 1 having a pair of discharge holes 1 2 disposed at a lower portion of the sliding nozzle 1 接合 is disposed to form a molten steel outflow hole 20 that enters the ingot mold 6 from the intermediate flow groove 9. In order to prevent adhesion of aluminum to the inner wall surface of the immersion nozzle 1 1 , an inert gas such as argon gas or nitrogen gas is blown into the molten steel material outflow hole 2 from the upper nozzle 16 , the fixed plate 7 , the immersion nozzle 1 1 or the like. On the back surface of the long side 7 of the ingot mold, the total magnetic force of the four bases is divided into two by the width direction of the long side 7 of the ingot mold by the immersion nozzle 11 and the moving magnetic 35 312 / invention specification (supplement) / 92 -05/92104189 1263550 The field generating device 13 has a center position in the casting direction as a position directly below the discharge hole 1 2, and is disposed opposite to the long side 7 of the ingot mold. Each of the moving magnetic field generating devices 13 is connected to the power source 28, and the power source 28 is connected to the control device 27 for controlling the moving direction of the magnetic field and the magnetic field strength, by the moving direction of the magnetic field based on the input from the control device 27 and The magnetic field strength and the electric power supplied from the power source 28 respectively control the magnetic field strength and the magnetic field moving direction applied by the moving magnetic field generating device i3. The control device 27 is connected to the process control device 26 that controls the continuous casting operation, and controls the period of application of the magnetic field based on the work information sent from the process control device 26. The magnetic field applied by the moving magnetic field generating device 13 is a moving magnetic field, and the application of the braking force by the application of the EMLS mode for the molten steel discharge flow 4 of the submerged nozzle 11 is moved as shown in FIG. The moving direction of the magnetic field is from the short side 8 side of the ingot mold toward the side of the submerged nozzle 11 side, and on the other hand, the application of the EMRS mode is used to induce the molten steel flowing in the horizontal direction along the solidification interface. As shown in FIG. 1A, 'the moving direction of the moving magnetic field is formed in the opposite direction along the long side 7 of the opposite ingot mold, and in addition, the application of the EMLA mode is used to spout the molten steel for the dip nozzle 11. When the flow 4 is supplied with the acceleration force, as shown in Fig. 11, the moving direction of the moving magnetic field is from the side of the submerged nozzle 1 1 toward the short side 8 side of the ingot mold. In Fig. 10, the moving magnetic field forms a moving mode that rotates in the clockwise direction, but the same effect can be obtained by moving the magnetic field in the counterclockwise direction. Further, Fig. 9, Fig. 10, and Fig. 1 1 show the moving directions of the magnetic fields of the respective modes of EMLS, EMRS, and EMLA from the upper side of the ingot mold 6, and the arrows in the figure show the moving direction of the magnetic field. 36 312/Inventive Manual (Repair)/92-05/921 〇4189 1263550 Guide roller for ingot mold 6 (not shown for j pinch roller 1 4. His pinch roller. In this way, there are few inclusions. The product is taken from the pot (not in the field flow tank 9 through 8, in the melted. The molten steel material is discharged from the hole 1 2, and the flow is 4, and the injection is injected into the ingot mold to inject a specified amount into the solidified shell 25 Pulling. Pulling the casting speed in the ingot mold 6. Powder 1 5. Casting this oxidation prevents and condenses one of the short sides of the ingot mold during the casting, which is provided by the support below the molten steel surface. A plurality of ingot pieces 5 are used: and a plurality of ingot pieces 5 are drawn from the lower part of the praying die 6, and a continuous casting machine in which a pinch roll** is described in FIG. In order to cast the surface layer of the ingot sheet 5, the medium-quality ingot sheet is operated as follows. 丨)) The molten steel material 1 is injected into the intermediate flow tank 9, and when the amount of the molten steel material reaches a specified amount, the sliding plate is opened. The steel material outflow hole 20 injects the molten steel material 1 into the ingot mold 6 1 from the molten steel material impregnated in the ingot mold 6 toward the ingot The molten steel in the direction of the short side 8 of the mold is discharged into the ingot mold 6. The molten steel j 6 injected into the ingot mold 6 is cooled to form a solidified shell 2. Then, after the molten steel 1 of the ingot mold 6 is driven, the pinch roller 14 is driven to start the outer casing, and the ingot sheet having the unsolidified molten steel 1 inside is started, and the molten steel level 3 is melted. At a substantially specified position of the position control, the casting speed is increased by adding the casting powder 15 to the molten steel level 3 in the ingot mold 6 to be melted, and the solid shell 2 and the ingot as the molten steel 1 are used. The effect of the inflow of lubricant between the molds 6. The near molten steel flow rate of the molten steel level 3 is determined under various casting conditions. Determining the flow rate of the molten steel material The method of estimating the flow rate of the molten steel of 3 based on each casting condition using the above formula (4). In this case, it can be presumed on the table of 37 312 / invention manual (supplement) / 92-05 / 92104189 1263550 without the need for continuous measurement, and can quickly respond to various casting conditions, and therefore, as the flow rate of the molten steel is determined. The method is ideal. The other method is a method of continuously measuring the flow rate of the molten steel of the molten steel level 3. The molten steel flow rate of the molten steel level 3 is substantially determined by the conditions determined by the casting conditions. Therefore, the molten steel flow rate of the molten steel liquid level 3 is measured under the predetermined casting conditions. The conditions of prayer are determined. In this case, the measured enthalpy of the molten steel flow rate can also be taken in time, and the taken-in measurement is determined as the molten steel flow rate. The flow rate of the molten steel material is measured by immersing a thin rod made of a refractory material on the molten steel liquid level 3, and the kinetic energy obtained from the thin rod can be measured. In addition, when the flow rate of the molten steel near the short side of the ingot mold of the molten steel level 3 is less than the flow rate of inclusion adhesion, it is specifically not full. At 2〇111/sec, the moving magnetic field is applied by the EMRS or EMLA mode. On the other hand, when the flow rate of the molten steel near the short side of the ingot mold of the molten steel level 3 exceeds the flow rate of the casting powder, the specific flow rate is specific. When it is more than 0 · 3 2 m / s, the moving magnetic field is applied by the e MLS mode. Moreover, when the flow rate of the molten steel near the short side of the ingot mold of the molten steel level 3 is less than the flow rate of the inclusion adhesion, it is preferable to subdivide the application method of the moving magnetic field into two methods: in the molten steel When the flow rate of the material is not full, the flow rate is not sufficient. When the temperature is less than 0 · 10 m / sec, the moving magnetic field is applied by the EML Α mode; the flow rate of the molten steel is not full, and the inclusion flow rate is When it exceeds the liquid level of the liquid surface, it is 0. 1 0m / sec or more and less than 0. At 20 m / s, the moving magnetic field is applied by the E M R S mode. The magnetic flux density of the moving magnetic field is based on the above-described method of applying a moving magnetic field in such a manner as to rotate the molten steel 1 in the ingot mold 6 in the horizontal direction 38 312 / invention specification (supplement) / 92 - 〇 5 / 921 〇 4189 I263550 In the formula (i), when the moving magnetic field is applied in such a manner as to supply the accelerating force to the molten steel discharge stream 4 of the submerged nozzle 11, it is set based on the above formula (2); in the molten steel for the impregnation nozzle 11. When the moving magnetic field is applied to the material discharge/discharge flow 4 to supply the braking force, it is set based on the above formula (3). The target value of the molten steel flow rate of the molten steel level 3 after the application of the moving magnetic field is 〇. 25 m/s. Fig. 1 2 to Fig. 1 7 show a flow chart when the moving magnetic field can be applied as such based on F値. Fig. 1 is a flow chart (flowchart A · 1 ) when the moving magnetic field is applied by the EMRS mode when the flow velocity of the molten steel near the short side of the ingot mold of F is not full. 3 is a flow chart (flow chart A - 2) when the moving magnetic field is applied by the EMLA mode when the surface flow velocity of the molten steel near the short side of the ingot mold of F is not full. According to the surface flow velocity of the molten steel near the short side of the ingot mold of F値, when the liquid surface is not covered by the liquid surface, the moving magnetic field is applied by the EMLA mode, and the surface velocity of the molten steel near the short side of the ingot mold of the F値 is applied. Flowchart when the moving magnetic field is applied by the EMRS mode (flowchart A-3) when the flow rate of the inclusion is not full, and is higher than the flow rate of the liquid surface (Figure A-3), Figure 15 shows the movement applied by the EMLS mode. A flowchart of a method of determining the magnetic flux density in a magnetic field (flowchart B), and FIG. 16 is a flowchart (flowchart C) showing a method of determining the magnetic flux density when a moving magnetic field is applied by the EMLA mode, and FIG. The EMRS mode applies the magnetic flux density when moving a magnetic field A flowchart (flowchart D) given method. As shown in Fig. 12 to Fig. 14, the inertia based on the thickness of the ingot, the width of the ingot, the casting speed, the helium gas entering the molten steel outflow hole 20, etc. 39 312 / invention specification (supplement) / 92 -05/92104189 1263550 Information on the casting conditions of the shape of the gas-injecting weight and the dipping nozzle n in use. 'F値 under the casting condition is obtained using the above formula (5), and the above (4) β is obtained from m $ @f彳 directly calculates the surface velocity of the molten steel near the short side of the ingot mold. The surface flow rate of the molten steel obtained by the calculation and the impregnation flow rate of the casting powder, the inclusion flow rate of the inclusion and The liquid surface skinning velocity is divided into the EMLS mode, the EMLA mode, and the emrs mode by dividing the applied moving magnetic field from the parental response flow rate. When applied by the EMLS mode, based on the flowchart b of FIG. 15, the necessary magnetic flux density is calculated, and the specified current 决定 is determined and applied. When applied by the EMLA mode, the calculation is based on the flowchart C of FIG. The necessary magnetic flux density is determined, and the specified current 値 is determined and applied. When applied by the EMRS mode, the necessary magnetic flux density is calculated based on the flow chart D' of FIG. 17 to determine and apply the specified current 値. In this case, the casting condition is that the holding information of the process control device 26 is input to the control device 27, and in the control device 27, from the calculation step of F値 to the calculation step of generating the current 値 for the specified magnetic flux density. The power source 28 supplies power to the moving magnetic field generating device 13 based on the magnetic field mode and current input from the control device 27. In the prayer process, the control device 27 is at a time when the periodic or casting conditions are changed. When the type of the moving magnetic field and the magnetic flux density are obtained according to the above procedure, the power source 28 will not move toward the moving magnetic field. Type and current 値. According to this, the moving magnetic field can often be applied in the optimum mode even if the casting conditions are changed. Further, in Fig. 12 to Fig. 14, the F 値 is converted into the molten steel surface flow rate, but, as described above, since the F 値 and the molten steel flow rate are one-to-one 40 312 / invention specification (supplement) /92-〇5/921 〇41矽1263550 Relationship, even if F値 is not converted to molten steel surface flow rate, F値 can be used for control. In addition, in Fig. 15, "the flow rate of the liquid surface under molten steel at a 1 M width position is obtained by the regression equation from F 」" is described. However, the above formula (4) is melting near the short side of the ingot mold. The steel material flow rate can be obtained by changing the coefficient k of the formula (4) by calculating the flow rate of the molten steel directly under the liquid level at the 1 / 4 width position. The flow rate of the molten steel at the liquid level of the 1/4 width position and the flow rate of the molten steel near the short side of the ingot mold, as shown in the above figure, does not have a correlation, and the flow rate of the molten steel under the liquid level in the width position is It can also be obtained from F値. In the magnetic field application method described above, the flow velocity of the molten steel near the short side of the ingot mold is not applied to the moving field above the flow rate of the inclusion adhesion limit and the casting powder entrapment speed limit, but It is preferable to apply a moving magnetic field also in this range. That is to say, as described above, the flow rate of the molten steel in the molten steel surface of the ingot mold has an optimum flow rate in the quality of the ingot 〇 (=〇.  2 5 m / sec., preferably in a way that is often the best flow rate 値. According to this, in the ingot mold, the flow rate of the molten steel near the short side of the ingot mold of the liquid surface of the steel is the upper limit of the flow rate of the inclusions and less than the optimum flow rate, in order to melt the steel. The flow rate of the material surface is the optimum flow rate 値, which is applied by the EMRS mode or the EMLA mode. On the other hand, the flow rate of the molten steel near the short side of the ingot mold which melts the molten steel surface in the ingot mold exceeds the optimum flow rate. However, in the case where the casting powder is not involved in the confined flow rate, in order to make the flow rate of the molten steel surface the optimum flow rate, it is applied by the EMLS mode. In this case, the flow rate of the molten steel near the short side of the ingot mold that melts the molten steel surface in the ingot mold is close to the optimum 41 312 / invention specification (supplement V92-05/921 (Μ 189 1263550 flow rate 値, There is a need to reduce the density of the applied magnetic flux. In the application method, in the case of controlling based on F値, it is only necessary to convert the "casting powder into the threshold flow rate" of the flow of the graphs 2~_14 into " The flow of the optimum flow rate can be carried out. Figure 1 8 shows a schematic view of a method for controlling the flow of molten steel in an ingot mold by this method of thinking. The flow rate of the molten steel near the short side of the die is 0. In the case of a range of 20 m/sec or more to 〇32 m/sec or less, there is no need to apply a moving magnetic field, but as described above, in order to make the target of the molten steel flow rate 〇25 m/sec which is the optimum flow velocity ,, as shown in Fig. 18. The flow rate of the molten steel near the short side of the ingot mold of the molten steel level 3 is 〇. 20m / sec or more and not full. The range of 25 m / sec can be applied by EMRS or EMLA mode, but it is 0 when it exceeds 〇 25 m / sec. The case of the range of 32 m/sec or less can be applied by the EMLS mode. In this case, as the molten steel flow rate approaches the target enthalpy.  2 5 m / sec, while reducing the magnetic field strength. Thus, by continuously controlling the flow of the molten steel in the ingot mold 6 to continuously cast the molten steel 1, even in a wide range of casting speeds, not only the deoxidation product and the argon bubble, but also the entrainment of the cast powder 15 is extremely small. Therefore, it is possible to stably cast a pure high-quality ingot sheet 5. Further, in the above description, a sliding nozzle cymbal composed of two sheets is used. However, the sliding nozzle composed of three sheets can also be applied to the present invention according to the above method. Further, in the case of the stop mode, the present invention is also applicable to the above method. (Embodiment) 312/Invention Manual (Supplement)/92-05/92104189 42 1263550 Using the steel rushing continuous casting machine shown in Figs. 6 to 8, the magnetic field in the EMRS mode is changed under the condition of changing the casting speed at 4 levels. Casting was performed under the conditions of application, magnetic field application in the EMLS mode, magnetic field application in the EM LA mode, and no application of the magnetic field, and the influence of the surface quality of the ingot was affected by the application of the magnetic field. Table 2 shows the specifications of the continuous casting machine used, and Table 3 shows the conditions of the moving magnetic field generating device used. C: 0 when casting. 03 ～0·05 mass %, Si: 0. 03 mass % or less, Μη: 0. 2 ~ 0. 3mass%, Ρ: 0. 020mass% or less, sol. Al: 0·03 ～0. 06mass%, N: 0 · 0 0 3~0 · 0 0 6 m a s s % of low carbon aluminum bismuth steel. [Table 2] Item Continuous casting model Vertical bending type ~ Vertical part length 2. 5m pot melting steel capacity 3 0 01 ο η intermediate flow tank molten steel capacity 8 0 t ο η ingot thickness 2 3 5 mm ingot width 700 ~ 1650mm casting speed maximum 3. 0 m / mi η Immersion nozzle down 25 degrees, discharge hole 8 0 mm φ [Table 3] Magnetic field type linear motor type power supply Guari · 2000k VA-AC/Strand - Voltage Max 4 3 0V Max 2 700A Frequency Φ 〇~2. The flow rate (u) of the molten steel near the short side of the ingot mold of the molten steel surface in the 6 Hz ingot mold is estimated by the above formula (4). However, in order to obtain the molten steel flow rate of the molten steel surface in the ingot mold from the formula (4), as described above, it is necessary to obtain the velocity (Ve), the angle (Θ), and the distance (D). In the present embodiment 312/invention specification (supplement)/92-〇5/921 〇4189 43 1263550, this is obtained as follows. The velocity (Ve) was obtained by the following (i 3 ) equation obtained by multiple regression analysis of the results of the water model test on the molten steel discharge flow trajectory. In the formula (3), 'W is the full width of the cymbal (nim), the amount of molten steel injected per unit time (m 3 / sec), d is the discharge aperture (m), α is impregnation The discharge angle (deg) of the nozzle, Qg is the amount of gas blown into the molten steel outflow hole (N m3 / sec), A, B !, 1, m, n, p are constant, Table 4 shows value.

Ve= Aj · (W/2)1 · QLm - dp · (l/cosa)n · exp(Bj · Qg) (13) Constant ai a2 bi b2 C 1 c2 di d2 Number 389 0.0389 -0.3202 0.0078 0.0305 18.37 107.33 -0.1980 -2.0679 number r 1 r 2 r i1 r i2 r i3 wide 4 ζ 1 r 21 r 22 number 値1 .0 0.0120 -1 .5 8 9 3 1.1371 1.195 1.633 -1.5662 1.1647 number r 23 r 24 Ai Bi 1 Μ NP number 値 0.726 2.186 0.3716 100.9 -0.651 0.745 -0.5 07 -----—— -1 . 1 6 5 Again, the angle (Θ) and the distance (D) are derived from the trajectory of the molten steel discharge. In this case, first, the trajectory of the molten steel discharge flow is obtained by the following equation (1 4) obtained by multiple regression analysis of the results of the water model test on the molten steel discharge flow path. However, in the formula (1 4), y is the vertical direction distance (m) at which the outlet of the immersion nozzle discharge hole is the origin, and X is the horizontal distance (m) at which the outlet of the immersion nozzle discharge hole is the origin, and α is The discharge angle (deg) of the immersion nozzle, S is the average discharge aperture (m), and a, a2, b, b2, c!, c2, ch, and d2 are constants showing the 値 in Table 4, Gi, G2. For the purpose of the 44 312 / invention manual (supplement) / 92_05 / 921 (Μ 189 1263550 this 値 is shown in the specified number of the following (1 5 ) formula. However, in (1 5), QL is each The amount of molten steel injected per unit time (m 3 / sec) Qg is the amount of argon blowing into the molten steel outflow hole (Nm 3 / sec), r 1 Γ 2, ri 1, Γι2, Γι', Γι4, Γ21, Γ22, Γ2', Γ24 are constants, and Table 4 shows the 値. y = ( a ] + b ] a + c } S ^ d } a S)Gjx2- (a 2^ b 2 a + c 2 S + D2 a S) G 2X ...(14)

Gi= exp{- ^ , * Ql ', ] · Qgc ' · ^ * (90-a)c "} (15) Thus, the X of the trajectory of the molten steel from the molten steel obtained by the formula (14) = The differential of the W position is obtained by the angle (Θ), and the distance (D) is obtained based on the y x of the x = W/2 position of the trajectory of the molten steel discharge flow obtained by the equation (1 4). The following calculation methods are shown in (1 6 ) and (1 7 ). However, h of the formula (1 7 ) is the distance (m) from the molten steel surface in the ingot mold to the upper end of the discharge hole. ...(16) Dy\x^,2^h ---(17) (17) Speed (Ve), angle (0) and distance (D) obtained from such, as well as casting conditions and melting The molten steel material flow rate (u) was calculated from the steel density (7 00 Ok g/m 3 ). The constant k is 0.03 6. Table 5 shows the casting conditions for the test castings of Tests N 〇 1 1 1 1 . As shown in Table 5, the casting conditions are roughly classified into four grades of A, B, C, and D according to the casting speed, and the grade A is the molten steel flow rate of the molten steel surface in the ingot mold is excessively large and exceeds the casting. When the powder is involved in a confined flow rate, in contrast to 45 312 / invention specification (supplement) / 92-05/921 (Μ 189 1263550, grades B and D are the molten steel flow rate of the molten steel level in the ingot mold) If it is too small and lower than the flow rate of the inclusions, especially the level D is lower than the flow rate of the liquid surface. In each of the grades A, B and d, (〗): The mode and intensity of the best moving magnetic field are selected based on the method of the present invention (test No. 1, test Νο.5, test Νο·1〇; in this case, molten steel in the ingot mold after application of the magnetic field The target value of the molten steel flow rate of the liquid level is 0 · 2 5 m / sec., (2): the case where a moving magnetic field of a mode different from the mode of the optimum moving magnetic field is applied (test No. 2, test νο) ·4, test n〇.6, test No·9), (3): no moving magnetic field is applied (test N〇3, Three cases of test No. 7 and test No. U) are shown in Fig. 19. Fig. 19 shows a pattern diagram in which these conditions are superposed on the above-mentioned Fig. 18. Rank C (test N〇8) is the molten steel level in the ingot mold. The flow rate of the molten steel is in a suitable range, and no moving magnetic field is applied. [Table 5] Test No. Test grade cast mirror! Sheet i# Manufacturing speed F値 Melted steel stone stove field thickness (mm) Width (mm) ( m/min) Flow rate (m/s) Mode Magnetic flux density (T) its rp7 Frequency Φ (Hz) 1 A-1 235 1550 2.0 6.1 0.45 EMLS 0.09 1.0 2 A-2 EMRS 0.10 2.6 3 A-3 No application _ 4 B-1 EMLS 0.09 1.0 5 B-2 235 1550 1.0 1.5 0.10 EMRS 0.10 2.6 6 Β·3 EMLA 0.15 1.0 7 Β-4 No application 8 CM 235 1550 1.5 3.6 0.25 No application 9 Dl EMRS 0.10 2.6 10 D-2 235 1550 0 · 6 0.8 0.06 EMLA 0.15 1.0 11 D-3 1 --__ No application — 312/Invention manual (supplement) /92-05/92104189 46 1263550 Cutting the cast ingot from the long side surface 1 mm ' was subjected to hungry processing and observed by an optical microscope to count the number of inclusions having a diameter of 60 cm or more. In addition, the inclusions are determined from the color tone and shape at the time of mirror inspection, and the types of deoxidized products (aluminum) and cast powder are counted according to the type of the seed. The scope of the inspection was 3 600 m 2 for each test. Figure 2 0 to Figure 3 show the results of this inspection. As shown in the figure, in the grade A, the number of inclusions in the test N 〇 . 1 (grade A - 1 ) ' where E M L S was applied was extremely small, and no inclusions of the cast powder were determined. This can be considered to be the reason why the molten steel flow rate is controlled by the target enthalpy of the cast powder below the threshold flow rate by E M L S . On the other hand, in the other two tests (grades A - 2, A - 3), there are inclusions determined to be cast powder, and the size of these inclusions is 1 〇〇 / / m or more. There is a high possibility of generating surface defects such as cracks after the system. In the grade B, the number of inclusions was minimized in the test Νο·5 (level B-2) to which the EMRS was applied. This can be considered as the reason why the flow velocity of the solidification interface is well controlled by the EMRS to the target enthalpy above the inclusion flow rate. Further, the test Νο·6 (grade Β-3) to which EMLA was applied was the same as the test No. 5, and the number of inclusions was small and very good. However, in the case of EMLA, since the discharge flow is accelerated, when the application strength is excessively large, the entrainment frequency of the cast powder is increased, so that it is necessary to adjust the application strength of EMLA in response to F値, and the operation is complicated compared with EMRS. On the other hand, in Test No. 4 (Grade B-1) to which EMLS was applied and Test N 〇·7 (Grade B - 4) to which no moving magnetic field was applied, since the flow velocity at the solidification interface was considered to be too small, inclusions were present. The number of objects has increased. 47 3 ] 2/Inventive Manual (Supplement)/92-05/92104189 1263550 In Class D, the test Ν ο . . 1 (Grade D - 2 ) with E M L· A is applied, and the number of inclusions is minimized. This can be considered as the EM LA, the molten steel in the molten steel surface of the ingot mold is renewed' at the same time, the flow rate of the molten steel surface in the ingot mold is increased, and the skin and inclusions can be prevented. The reason for the attachment. In the test N 〇 . 9 (grade D - 1 ) to which E M R S was applied, it was observed that the total number of inclusions was small, and it was considered to be a large-sized cast powder inclusion which was caused by the application of the cast powder of the skin. In the test Ν 0.11 (grade D - 3) where no magnetic field is applied, since the flow velocity at the solidification interface is considered to be too small, the number of inclusions increases. Further, in Test No. 8 (Grade C-1), since the flow rate of the molten steel of the molten steel surface is lower than the flow rate of the casting powder, and is higher than the flow rate of the inclusion adhesion, it is known that In the absence of any EMLS, EMRS, EMLA mode, the number of inclusions is small. (Effect of the Invention) According to the present invention, it is possible to cast a mirror-quality mirror having a small amount of surface inclusions in a wide range of casting speeds. As a result, it is possible to directly perform rolling without the need to manually insert the prayer piece, thereby achieving a reduction in the manual operation cost of the ingot piece, the fuel unit of the rolling furnace, and the preparation time from the start of casting to the rolling. The effect of either. Thus, the present invention can greatly contribute to the reduction in the manufacturing cost of steel products. Moreover, the magnetic field applying force of each mode of the present invention by EMLS, EMRS, and EMLA can be obtained in one moving magnetic field generating device by the conversion of the moving direction of the magnetic field, and thus it is possible to control the flow of the molten steel material. The equipment cost on the magnetic field generating device is suppressed to a low level. 48 312/Invention Manual (Supplement)/92-05/92104189 1263550 [Simplified Schematic] Figure 1 shows the molten steel in the ingot mold along the width direction of the center of the thickness of the ingot mold by numerical simulation. A map of the flow rate of molten steel at the level of the feed. Fig. 2 is a graph showing the relationship between the liquid flow velocity of the glutinous steel in the vicinity of the short side of the ingot mold measured in a practical machine, and the F 値 calculated from the casting condition at this time. Figure 3 is a graph showing the relationship between the surface flow rate of molten steel and the input current of EMLA measured in a practical machine. Fig. 4 is a view showing a graph for correcting the map of Fig. 3 by the parameters of the equation (2). Fig. 5 is a schematic view showing the flow of molten steel in the mold cavity mold, Fig. 5 (Α) is a state diagram showing the magnetic field not applied, and Fig. 5 (( ) is a state diagram showing the application of ε M L S . Fig. 6 is a schematic view showing a slab continuous casting machine used in the practice of the present invention, and a schematic perspective view of a portion of the ingot mold. Fig. 7 is a schematic view showing a slab continuous casting machine used in the practice of the present invention, and is a schematic front view of a portion of the ingot mold. Fig. 8 is a schematic cross-sectional view showing a slab continuous casting machine used in the practice of the present invention, and a schematic diagram of a magnetic field control device for controlling an applied magnetic field. Fig. 9 is a view showing the moving direction of the magnetic field in the E M L S mode from directly above the ingot mold. Fig. 1 is a diagram showing the moving direction of the magnetic field in the E M R S mode from directly above the ingot mold. 49 312/Invention Manual (Supplement)/92-05/92104189 1263550 Fig. 11 is a view showing the moving direction of the magnetic field of the EMLA mode from directly above the ingot mold. Fig. 12 is a view showing an embodiment of the present invention, which is a flow when a moving magnetic field is applied by the EMRS mode when the flow rate of the surface of the molten steel near the short side of the ingot mold of F is less than the flow rate of inclusion adhesion. Figure. Fig. 13 is a view showing an embodiment of the present invention, which is a flow when a moving magnetic field is applied by the EMLA mode when the flow rate of the surface of the molten steel near the short side of the ingot mold of F is less than the flow rate of inclusion adhesion. Figure. Figure 14 is a view showing an embodiment of the present invention, in which the moving magnetic field is applied by the EMLA mode according to the surface flow velocity of the molten steel near the short side of the ingot mold of F値, according to the EMLA mode, according to The flow chart when the moving magnetic field is applied by the EMRS mode when the flow rate of the molten steel near the short side of the ingot mold of F is less than the flow rate of the inclusion adhesion limit and the flow rate of the liquid surface is higher than the liquid level. Fig. 15 is a view showing an embodiment of the present invention, and is a flowchart showing a method of determining the magnetic flux density when a moving magnetic field is applied by the e M L S mode. Fig. 16 is a view showing an embodiment of the present invention, and is a flowchart showing a method of determining the magnetic flux density when a moving magnetic field is applied by the EMLA mode. Fig. 17 is a view showing an embodiment of the present invention, and is a flowchart showing a method of determining the magnetic flux density when a moving magnetic field is applied by the EMRS mode. Fig. 18 is a schematic view showing a method of performing flow control of molten steel in the ingot mold of the present invention. Figure 9 is a schematic diagram showing the superposition of these conditions on the aforementioned Figure 18. Figure 20 is a 312/invention specification (supplement)/92-05/92104189 50 1263550 showing the results of the inspection of the ingot piece of the grade A-1 of the embodiment. Fig. 21 is a view showing the results of the inspection of the ingot piece of the grade A-2 of the embodiment. Fig. 2 2 is a view showing the results of the inspection of the ingot piece of the grade A - 3 of the embodiment. Fig. 23 is a view showing the results of the inspection of the ingot of the grade B-1 of the embodiment. H 2 4 Stomach _ $ Figure of the results of the spectroscopy results of the ingots of Grade B-2. Η 2 5 is a graph showing the results of the inspection of the ingot of the grade b _ 3 of the embodiment. Β 26 is a graph showing the results of the inspection of the ingot of the grade Β_4 of the Example. Fig. 27 is a view showing the results of the inspection of the ingot of the grade C-1 of the embodiment of the invention. Fig. 28 is a view showing the results of the inspection of the ingot of the grade D-1 of the embodiment of the invention. Fig. 29 is a view showing the results of the inspection of the ingot piece of the grade D-2 of the embodiment. Fig. 3 is a view showing the results of the inspection of the ingot of the grade D-3 of the embodiment of the invention. (Description of component symbols) 1 Melted steel 2 Solidified shell 312 / invention manual (supplement) / 92-05/92104189 51 1263550 3 molten steel level 4 molten steel discharge stream 5 ingot sheet 6 ingot mold 7 Ingot die long side 8 Ingot die short side 9 Intermediate flow cell 10 Slide nozzle 11 Dip nozzle 12 Extrusion hole 13 Moving magnetic field generating device 14 Pinch roller 15 Casting powder 16 Upper nozzle 17 Fixing plate 18 Sliding plate 19 Rectifying nozzle 20 Melting Steel material outflow hole 2 1 Liquid level melted steel stream 2 2 Interface melted steel stream 23 Liquid level melted steel stream 2 4 Interface melted steel stream 2 5 Ingot thickness central position 26 Control continuous casting Work process control device 52

312/Invention Manual (Supplement)/92-05/92104189 1263550 2 7 Control device for controlling the direction of movement of the magnetic field and the strength of the magnetic field 28 Power supply 53 312/Invention manual (supplement)/92-05/92104189

Claims (1)

1263550 Pick up, apply for patent scope 1 .  A flow control method for molten steel in a casting mold is a method for applying a magnetic field to a molten steel in an ingot mold of a continuous casting machine to control the flow of molten steel in the ingot mold, characterized in that: When the flow rate of the molten steel in the molten steel surface of the ingot mold exceeds the flow rate of the molten powder into the threshold flow rate, the moving magnetic field is applied in such a manner as to supply the braking force to the discharge flow of the impregnation nozzle, and the molten steel surface is melted in the ingot mold. The flow rate of the steel is controlled at the specified flow rate of the molten steel; when the flow rate of the molten steel in the molten steel surface of the ingot mold is less than the flow rate of inclusion adhesion, the flow of the molten steel in the ingot mold is increased. The method applies a moving magnetic field to control the flow rate of the molten steel in the molten steel surface of the ingot mold to be above the flow rate of the inclusion adhesion threshold, and in the range where the casting powder is involved in the flow rate below the threshold flow rate. 2 · The method for controlling the flow of molten steel in the ingot mold is a method for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the billet to control the flow of the molten steel in the ingot mold, and the characteristics thereof When the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the flow rate of the casting powder, the moving magnetic field is applied in such a manner as to supply the braking force to the discharge flow of the submerged nozzle, and the molten steel is melted in the ingot mold. The molten steel flow rate of the liquid level is controlled at the specified molten steel flow rate; when the flow rate of the molten steel in the molten steel surface of the ingot mold is less than the inclusion flow rate of the inclusions, the ingot mold is rotated in the horizontal direction. The molten steel material is applied in a manner to apply a moving magnetic field to control the flow rate of the molten steel in the molten steel surface of the ingot mold above the flow rate of the inclusion adhesion limit, and the casting powder is involved in the range below the threshold flow rate. 3 . Flow control of molten steel in an ingot mold as claimed in item 2 of the patent application 54 312 / Invention Description β: (Supplement) / 92-05/92104189 1263550 Method 'where the movement is applied in a horizontal manner In the case of a magnetic field, the magnetic flux density determined by the following formula (1), R = y · B · (1) but in the formula (1), R is the constant determined by the molten steel in each device, B ( Tes 1 a ) ' f is for the moving magnetic field to produce blue 4 .  A method for melting a flow of molten steel in an ingot mold of a continuous casting machine for molten steel in an ingot mold, which is wound into a threshold flow rate at the end of the molten steel surface in the ingot mold, The immersed method applies a moving magnetic field to control the flow rate of the molten ingot at the specified molten steel level. The flow rate of the molten steel is not full. The discharge flow of the impregnated nozzle is supplied to the molten steel. Above, while casting powder roll 5 . The method of claim 4, wherein when the moving magnetic field is applied to the immersion method, the magnetic flux density determined by the following formula (2) is shifted, Αν = 1 + ε · (L- U0) / U02 · Β2 However, in the formula (2), Αν is defined as the relative magnetic flux of the moving magnetic field to the molten steel in the rotating ingot mold, and r is the input current of the magnetic flux density device for the moving magnetic field. frequency. The flow control method is to apply a magnetic field to the steel material to control the characteristics of the ingot mold: the flow rate of the molten steel exceeds the flow rate of the molten steel flowing through the discharge flow of the cast powder nozzle to the molten steel in the mold; in the ingot mold When the inner molten steel material adheres to the confined flow rate, the moving magnetic field is applied in a corresponding manner, and the casting flow rate is controlled to a range in which the inclusion adheres below the threshold flow rate. The magnetic flux density of the kinetic magnetic field of the flow control nozzle for melting the molten steel in the ingot mold is specified as the number of ((...) £ 从 from the short side of the ingot mold 55 312 / invention manual (supplement) /92-〇5/921 〇4189 1263550 The flow rate of the molten steel on the side of the impregnated nozzle on the side, and the flow rate of the molten steel in the opposite direction in a negative number '. The surface of the molten steel when casting is performed without applying a moving magnetic field. The flow rate is used as the denominator, and the surface flow velocity of the molten steel when the moving magnetic field is applied by the magnetic flux density B is taken as the ratio of the molecules, ε is the coefficient, and L is the moving speed of the moving magnetic field, U. The average enthalpy (m/sec) in the width direction of the ingot mold along the linear velocity of the flow of the molten steel discharged from the discharge port of the immersion nozzle, and B is the magnetic flux density (t e s ] a) of the moving magnetic field. 6 . A flow control method for melting molten steel in an ingot mold according to the first aspect of the invention, wherein, when a moving magnetic field is applied in such a manner as to supply a braking force to the discharge flow of the submerged nozzle, the magnetic flux density of the moving magnetic field is defined as The magnetic flux density determined by the formula (3), Rv = l ^ /9 · B4/V 〇 (3) However, in the formula (3), R v is expressed as a positive number 从 from the short side of the ingot mold The flow rate of the molten steel toward the impregnation nozzle side is shown by a negative number 熔化, and the flow rate of the molten steel in the opposite direction is displayed. The surface velocity of the molten steel when casting is not applied is used as a denominator, and the moving magnetic field is applied at the magnetic flux density B. The ratio of the surface flow rate of the molten steel as the molecular time, ^ is the coefficient, and B is the magnetic flux density (tesla) of the moving magnetic field, V. The linear velocity (m/sec) of the flow of the molten steel discharged from the spout nozzle discharge port. 7. The flow control method for the molten steel in the ingot mold according to the first application of the patent scope, wherein the casting powder is required to be wound into a threshold flow rate of 0. 32m / sec, and the above-mentioned inclusion adhesion threshold flow rate is specified as 0. 20m / sec. 8 .  - a flow control method for molten steel in an ingot mold, which is to apply a magnetic field to the molten steel in the ingot mold of the continuous casting machine for controlling the ingot mold 56 312 / invention specification (supplement) / 92-05 / 92104189 1263550 A method for the flow of molten steel therein, characterized in that: the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the flow rate of the molten powder in the impregnated flow rate, and the braking force is supplied to the discharge flow of the impregnation nozzle. The method of applying a moving magnetic field 'controls the flow rate of the molten steel in the molten steel surface of the ingot mold to the specified molten steel flow rate; the flow rate of the molten steel in the molten steel surface in the ingot mold is less than the inclusion of the inclusion When the flow rate is limited to be higher than the flow rate of the liquid surface, the moving magnetic field is applied by rotating the molten steel in the ingot mold in the horizontal direction, and the flow rate of the molten steel in the molten steel surface of the ingot mold is controlled. Above the flow rate of inclusion adhesion, and the range below the flow rate of the casting powder; if the flow rate of the molten steel in the molten steel surface of the ingot mold is less than the flow rate of the liquid surface, Dip The discharge flow of the nozzle is applied to the acceleration force to apply a moving magnetic field, and the flow rate of the molten steel in the molten steel surface of the ingot mold is controlled to be above the flow rate of the inclusion adhesion threshold, and the casting powder is involved in the range below the flow rate. . 9 A flow control method for molten steel in an ingot mold as claimed in claim 8 wherein a magnetic field of the moving magnetic field is applied when a moving magnetic field is applied in a manner of rotating the molten steel in the ingot mold in a horizontal direction The density is defined by the magnetic flux density determined by the following formula (1), ϋ = γ · B · (1) However, in the formula (1), R is the relative velocity of the molten steel and the magnetic field, and T is the mother-in-1 The constant of the decision, B is the magnetic flux density of the moving magnetic field (tes 1 a ), and f is the input current frequency of the moving magnetic field generating device. 1 0 . A flow control method for molten steel in an ingot mold according to the eighth aspect of the patent application, wherein the accelerating force 312 is supplied to the discharge flow for the submerged nozzle (invention) _removal) / 92-05 / 92104189 1263550 When a moving magnetic field is applied, the magnetic flux density of the moving magnetic field is defined as the magnetic flux density determined by the following formula (2), Av = l + e .  (L- U〇) / U〇2 · B2 . (2) However, in the formula (2), Av is a positive number 値 showing the flow rate of the molten steel from the short side of the ingot mold toward the side of the immersion nozzle, and the molten steel in the opposite direction with a negative number 値The flow rate of the molten steel is used as a denominator when the surface of the molten steel is cast without applying a moving magnetic field, and the surface velocity of the molten steel when the moving magnetic field is applied by the magnetic flux density B is taken as a ratio of molecules, ε is a coefficient, and L is a moving magnetic field. The speed of movement, U. The average enthalpy (m/sec) in the width direction of the ingot mold along the linear velocity of the flow of the molten steel discharged from the discharge port of the immersion nozzle, and B is the magnetic flux density (t e s a) of the moving magnetic field. 1 1 . The flow control method of the molten steel in the ingot mold according to the eighth aspect of the patent application, wherein the magnetic flux density of the moving magnetic field is specified when a moving magnetic field is applied in such a manner as to supply a braking force to the discharge flow of the submerged nozzle For the magnetic flux density determined by the following formula (3), Rv = ] ^ /3 - B4/V〇...(3) But in the formula (3), RV is shown as a positive number 从 from the ingot mold The flow rate of the molten steel is directed to the side of the impregnating nozzle on the side, and the flow rate of the molten steel in the opposite direction is displayed in a negative number, and the surface velocity of the molten steel when casting is performed without applying a moving magnetic field as a denominator, which is applied at a magnetic flux density B When the magnetic field is moved, the surface velocity of the molten steel is taken as the ratio of the molecules, ^ is the coefficient, and B is the magnetic flux density (tesla) of the moving magnetic field, V. The linear velocity (m/sec) of the flow of the molten steel discharged from the spout nozzle discharge port. 1 2 . For example, the flow of molten steel in the ingot mold of claim 8 is 312 / invention specification (supplement) / 92-05 / 92104189 1263550 control method 'where the above-mentioned casting powder is required to be involved in the threshold flow rate (Κ 3 2 m / sec ' $ is set to the above-mentioned inclusion adhesion threshold flow rate (K20m / sec, the above-mentioned liquid surface skinning limit flow rate is 0.  1 0 m / sec. 1 3 · A flow control method for molten steel in an ingot mold is a method for applying a magnetic field to a molten steel in an ingot mold of a steel S continuous I die machine to control the flow of molten steel in the ingot mold , characterized in that: & _ @ in-mold molten steel material surface molten steel flow rate exceeds the minimum of the casting powder, and the best adhesion to the inclusions of the solidified shell, The moving magnetic field is applied in a manner that the discharge flow of the immersion nozzle supplies a braking force; when the flow rate of the molten steel in the molten steel surface of the ingot mold is less than the above optimum flow rate ,, the molten steel in the ingot mold is rotated in the horizontal direction. The way to apply a moving magnetic field. 1 4 · A flow control method for molten steel in an ingot mold, which is a method for applying a magnetic field to a molten steel in an ingot mold of a continuous casting machine for controlling the flow of molten steel in the ingot mold, characterized in that : When the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds the minimum flow rate of the cast powder and the minimum flow rate of the inclusions in the solidified shell, the discharge flow is supplied to the impregnation nozzle. The moving magnetic field is applied in a dynamic manner; when the flow rate of the molten steel in the molten steel surface in the ingot mold is less than the above optimum flow rate ,, the moving magnetic field is applied in such a manner as to supply an acceleration force to the discharge flow of the immersion nozzle. 1 5 · A flow control method for molten steel in an ingot mold according to the patent application category No. 13, wherein the optimum flow rate 値 is specified to be 0 · 2 5 m / sec. 1 6 · The flow control method for the molten steel in the ingot mold is for the ingot mold of steel 59 312 / invention specification (supplement) / 92 · 〇 5 / 921 (Μ 189 1263550 ± 5 continuous casting machine A method in which a magnetic field is applied to a molten steel material to control the flow of molten steel in an ingot mold, characterized in that: the flow rate of the molten steel in the molten steel surface in the ingot mold exceeds that of the cast powder, and is coagulated. When the optimum flow rate of the inclusions of the casing is minimized, the braking force is supplied to the discharge flow of the submerged nozzle, and the flow of the molten steel in the molten steel surface is not satisfied. When the above-mentioned optimum flow rate 値 is higher than the flow rate of the liquid surface, the moving magnetic field is applied by rotating the molten steel in the ingot mold in the horizontal direction; melting of the molten steel surface in the casting mold When the flow rate of the steel material is less than the flow rate of the liquid surface, the moving magnetic field is applied so as to supply an acceleration force to the discharge flow of the immersion nozzle. For example, in the flow control method of the molten steel in the ingot mold of claim 16 of the patent application, wherein the optimum flow rate 値 is specified as 0. 2 5 m / sec, the above liquid level is limited to the flow rate of 液. L〇m/second. 1 8 . A flow control method for molten steel in an ingot mold according to the first aspect of the invention, wherein a moving magnetic field is applied in a manner of supplying a braking force to a discharge flow of the submerged nozzle to control melting of the molten steel surface in the ingot mold. When the flow rate of the steel material is positive, the flow rate of the molten steel from the short side of the ingot mold toward the side of the impregnation nozzle is shown, and the flow rate of the molten steel in the opposite direction is indicated by a negative number, and the ingot is only removed from the impregnation nozzle. The flow rate of the molten steel at the central position of the molten steel at the center of the thickness of the ingot of the mold on the short side of the mold is controlled at -0. 0 7 m / s ~ 0 · 0 5 m / sec range. 1 9 . For example, in the flow control method of the molten steel in the ingot mold of claim 1, wherein, when the moving magnetic field is applied, the following formula (4) is used to push 60 312/invention specification (supplement)/92- 05/92104189 1263550 The molten steel flow rate of the molten steel surface in the ingot mold when the state of the magnetic field is increased is 'applied to the specified moving magnetic field based on the estimated molten steel flow rate, u=kf * βι * ^ * [ ( 1 -sin 0 )/2] · {HD)...(4) But 'in equation (4)' u is the molten steel flow rate of the molten steel surface in the ingot mold', ie the surface velocity of the molten steel (111/sec), k is the coefficient, p is the density of molten steel (kg/m3), ql is the injected amount of molten steel per unit time (m 3 / sec), and Ve is the molten steel discharge stream and ingot The speed at which the short side of the mold is in conflict (m/sec) '0 is the angle formed by the horizontal (deg) at the position where the molten steel discharge flow collides with the short side of the ingot mold, and D is from the molten steel The distance (rn) from the position where the discharge flow collides with the short side of the ingot mold to the molten steel surface in the ingot mold. 2 0. The flow control method for molten steel in an ingot mold according to claim 19, wherein the melting of the molten steel in the ingot mold is estimated by using the above formula (4) in casting. At the flow rate of the steel, the specified moving magnetic field will be applied based on the estimated flow rate of the molten steel. 2 1 · a flow control method for molten steel in an ingot mold, which is a method for applying a magnetic field to a molten steel in an ingot mold of a steel continuous casting machine to control the flow of molten steel in the ingot mold, When the F 所示 shown in the following formula (5) obtained from the 纟 1 condition exceeds the casting powder, the moving magnetic field is applied so that the braking force is supplied to the discharge flow of the immersion nozzle.値When the inclusions are not full, the moving magnetic field is applied by rotating the molten steel in the ingot mold horizontally, F Μ ^ p · Ql · Ve · [(l-sin0)/4] · ( Ι/D)...(5) 312/Invention Manual (Supplement)/92-05/92104189 1263550 However, in the formula, p is the density (kg/m3) of the molten steel, and QL is the melting per unit time. Steel injection amount (m 3 / sec), Ve is the speed (m / sec) of the melted steel material discharge flow and the short side of the f# ingot mold, 0 is the short side of the molten steel discharge flow and the ingot mold The angle formed by the horizontally conflicting position (deg)' D is the position where the molten steel discharge flow collides with the short side of the ingot mold. The distance (m) from the molten steel surface in the ingot mold. 2 2 - The flow control method of the molten steel in the ingot mold according to the second aspect of the patent application, wherein the moving magnetic field is applied when the molten steel in the ingot mold is rotated in the horizontal direction The magnetic flux density of the magnetic field is defined as the magnetic flux density determined by the following formula (1), R^y · B · ^f (1) However, in the formula (1), R is the relative velocity of the molten steel and the magnetic field, and τ is The constant determined by each device 'Β is the magnetic flux density (tesla) of the moving magnetic field 'f is the input current frequency for the moving magnetic field generating device. The flow control method for the molten steel in the ingot mold is a method for applying a magnetic field to the molten steel in the ingot mold of the steel continuous casting machine to control the flow of the molten steel in the ingot mold, which is characterized by : When the F値 shown in the following formula (5) obtained from the casting condition exceeds the casting powder being wound into the threshold F値, the moving magnetic field is applied in such a manner that the braking force is supplied to the discharge flow of the submerged nozzle; When the object adheres to the limit ρ値, the moving magnetic field is applied in such a manner that the acceleration force is supplied to the discharge flow of the immersion nozzle, FM = P · Qi · Ve · [(1 ^ sin Θ ) / 4 ] .  (}/D) (5) However, in the formula (5), p is the density (kg/m3) of the molten steel, which is 312/invention specification (supplement)/92-05/92104189 62 1263550 unit time The amount of molten steel injected (m3 / sec), Ve is the speed (m / sec) of the melted steel material discharge flow and the short side of the ingot mold, θ is short in the molten steel discharge flow and the ingot mold The angle (deg) formed by the horizontally conflicting position of the side of the side surface is the distance from the position where the molten steel discharge flow collides with the short side of the ingot mold to the molten steel surface in the ingot mold (m) ). twenty four . The flow control method of the molten steel in the ingot mold according to the second aspect of the patent application, wherein the magnetic flux density of the moving magnetic field is defined as when the moving magnetic field is applied in such a manner as to supply an acceleration force to the discharge flow of the submerged nozzle The magnetic flux density determined by the following formula (2), Av = J -l· s · (L- U〇) / U〇2 - B2 . . (2) However, in the formula (2), Αν is a positive number 値 showing the flow rate of the molten steel from the short side of the ingot mold toward the side of the immersion nozzle, and the molten steel in the opposite direction with a negative number 値The flow rate is the derivation of the surface velocity of the molten steel when the moving magnetic field is not applied, and the surface velocity of the molten steel when the moving magnetic field is applied as the magnetic flux density 作为 is taken as the ratio of the numerator, ε is the coefficient, and L is the moving magnetic field. Movement speed, U. The average enthalpy (m/sec) in the width direction of the ingot mold along the linear velocity of the flow of the molten steel discharged from the discharge port of the immersion nozzle, and B is the magnetic flux density (t e s 1 a) of the moving magnetic field. 2 5 . The flow control method of the molten steel in the ingot mold according to the second aspect of the patent application, wherein when the moving magnetic field is applied in such a manner that the braking force is supplied to the discharge flow of the submerged nozzle, the magnetic flux density of the moving magnetic field is defined as The magnetic flux density determined by the following formula (3), Rv = l ^ /9 · Β4/V 〇 (3) However, in the formula (3), Rv is expressed as a positive number 从 from the short side 63 of the ingot mold. 312/Invention Manual (Repair)/92-05/92104189 1263550 The flow rate of the molten steel on the side of the nozzle on the side of the smear, showing the flow rate of the molten steel in the opposite direction in a negative number, and casting without applying a moving magnetic field. When the surface velocity of the melted pin I is used as the denominator, the ratio of the magnetic flux density 表面 the surface velocity of the molten steel when the moving magnetic field is applied is taken as the molecular ratio, β is the coefficient, and Β is the magnetic flux density of the moving magnetic field (te S ; [ a) , V. The linear velocity (m/sec) of the flow of the molten steel discharged from the spout nozzle discharge port. 2 6 · The flow control method of the molten steel in the ingot mold according to the scope of claim _ Patent No. 2, wherein the above-mentioned casting powder is required to be involved in the threshold F値. 3, stipulate that the above-mentioned inclusion adhesion threshold F値 is 2. 7. 2 7 · a method for controlling the flow of molten steel in an ingot mold, which is a method for applying a magnetic field to a molten steel in an ingot mold of a steel continuous casting machine to control the flow of molten steel in the ingot mold, It is characterized in that, when F値 shown in the following formula (5) obtained from the casting condition exceeds the casting powder being wound into the threshold F値, the moving magnetic field is applied in such a manner that the braking force is supplied to the discharge flow of the submerged nozzle; When the full inclusion adheres to the limit F 値 and is higher than the surface of the liquid surface, the moving magnetic field is applied by rotating the molten steel in the ingot mold in the horizontal direction; When the skin is limited to F値, the moving magnetic field is applied so as to supply an acceleration force to the discharge flow of the submerged nozzle, F Μ = ^ Ql · Ve · [(l-sin0 )/4] · {HD) (5) However, In the formula (5), p is the density (kg/m3) of the molten steel, which is the injected amount of molten steel per unit time (m 3 / sec), and V e is the molten steel discharge stream and the short side of the ingot mold. Speed at the side collision (m / sec), 0 is the position where the molten steel discharge flow collides with the short side of the ingot mold Angle formed with the horizontal 64 312 / invention specification (supplement) / 92-05 / 921 〇 4189 1263550 (deg ) D is the position where the molten steel discharge flow collides with the short side of the ingot mold into the prayer mode The distance (m) from the molten steel surface. 2 8 · Flow control method for molten steel in an ingot mold as claimed in claim 27, wherein the movement is applied when a moving magnetic field is applied in a manner of rotating the molten steel in the ingot mold in a horizontal direction The magnetic flux density of the magnetic field is defined as the magnetic flux density determined by the following formula (1), · B · (1) However, in the formula (1), R is the relative velocity of the molten steel and the magnetic field, and 7 is for each device. The determined constant, B is the magnetic flux density (tesla) of the moving magnetic field 'f is the input current frequency for the moving magnetic field generating device. 29: A flow control method for melting molten steel in an ingot mold as claimed in claim 27, wherein 'the magnetic flux density of the moving magnetic field is specified when a moving magnetic field is applied in such a manner as to supply an acceleration force to the discharge flow of the submerged nozzle For the magnetic flux density determined by the following formula (2), Αν = 1+ ^ U0) / U〇^ - B2 (2) but in the equation (2), Av is expressed as a positive number from the ingot The short side of the mold faces the flow rate of the molten steel on the side of the impregnation nozzle, and the flow rate of the molten steel in the opposite direction is displayed in a negative number, and the surface velocity of the molten steel when casting is not applied with the moving magnetic field as the denominator, the magnetic flux density Β When the moving magnetic field is applied, the surface velocity of the molten steel is taken as the ratio of the molecules, e is the coefficient, L is the moving speed of the moving magnetic field, and U ◦ is the casting speed along the line of the molten steel discharged from the discharge nozzle of the immersion nozzle. The average 値 (m/sec) in the width direction of the ingot mold is the magnetic flux density (tesa) of the moving magnetic field. 3 0 · Flow of molten steel in ingot mold according to item 27 of the patent application scope 312 / invention specification (supplement) / 92-05/92104189 65 1263550 control method, in which the discharge flow for the impregnation nozzle When a moving magnetic field is applied by applying a braking force, the magnetic flux density of the moving magnetic field is defined as a magnetic flux density determined by the following formula (3), and Rv = ] · stone · B4 / V. (3) However, in the formula (3), RV is a positive number 値 showing the flow rate of the molten steel from the short side of the ingot mold toward the side of the dip nozzle, and the molten steel in the opposite direction with a negative number 値The flow rate of the molten steel is used as a denominator when the surface of the molten steel is cast without applying a moving magnetic field, and the flow velocity of the molten steel when the moving magnetic field is applied by the magnetic flux density B is taken as a ratio of molecules, /3 is a coefficient, and B is a movement. Magnetic flux density of the magnetic field (tesla), V. The linear velocity (m/sec) of the flow of the molten steel discharged from the spout nozzle discharge port. 3 1 . For example, the flow control method for the molten steel in the ingot mold of the patent application No. 27 is 'there is a specification that the above-mentioned mirror powder is involved in the threshold F値. 3, stipulate that the above-mentioned inclusion adhesion threshold F値 is 2. 7, the specified liquid surface skinning limit F 値 is 1 · 4. 3 2 · The flow control method for molten steel in the ingot mold is a method for applying a magnetic field to the molten steel in the ingot mold of the continuous casting machine of the billet to control the flow of the molten steel in the ingot mold, and the characteristics thereof It is: The optimum F値 shown in the following formula (5) obtained from the conditions of the above-mentioned formula (5) exceeds the optimum flow rate 对应 which is the least involved in the casting powder and has the least adhesion to the inclusions of the solidified shell. When the braking force is supplied to the discharge flow of the submerged nozzle, the moving magnetic field is applied; when the F値 is less than the optimum pH, the moving magnetic field is applied by rotating the molten steel in the ingot mold in the horizontal direction, 312/ BRIEF DESCRIPTION OF THE INVENTION (SUPPLEMENT) /92-05/92104189 66 1263550 F Μ ^ p * QL · Ve * [(1-sin 0 )/4] .  (1/D). . .  (5) However, in the formula (5), p is the density (kg/m3) of the molten steel, Ql is the molten steel injection amount per unit time (m 3 / sec), and Ve is the molten steel discharge flow and速度S The speed at which the sharp side of the sharp mold collides (m / sec), where 0 is the angle formed by the horizontal position (deg) at the position where the molten steel discharge flow collides with the _ sharp mode short side side. The distance (m) from the position where the molten steel discharge flow collides with the short side of the ingot mold to the molten steel surface in the ingot mold. 3 3 · A method for controlling the flow of molten steel in an ingot mold is a method for applying a magnetic field to a molten steel in a continuous ingot mold to control the flow of molten steel in the ingot mold, It is characterized in that: ρ 所示 shown in the following formula (5) obtained from the casting condition exceeds the optimum flow rate 对应 corresponding to the minimum flow rate of the cast powder and the least adhesion to the inclusions of the solidified shell 値When the braking force is supplied to the discharge flow of the immersion nozzle, the moving magnetic field is applied. When the F 値 is less than the optimum F ,, the moving magnetic field is applied so as to supply the acceleration force to the discharge flow of the immersion nozzle, F Μ ^ P · Ql · Ve · [(l-sin^)/4] · ( 1 / D) (5) But 'in equation (5)' p is the density of molten steel (kg / m 3), QL is the unit Time of molten steel injection (m 3 / sec), Ve is the velocity (m / sec) of the melted steel material discharge flow and the short side of the ingot mold conflict, 0 is the molten steel discharge stream and ingot The angle formed by the position of the short side of the die side and the horizontal formed angle (deg)' D is the flow from the molten steel and the ingot The distance from the short side of the mold to the distance (m) from the molten steel level in the ingot mold. 34. Flow of molten steel in an ingot mold according to item 32 of the patent application scope 67 312 / invention specification (supplement) / 92-05/92104189 1263550 control method, wherein the above-mentioned optimum F値 is specified as 3. 4 . 3 5 .  The method for controlling the flow of molten steel in an ingot mold is a method for applying a magnetic field to a molten steel in an ingot mold of a continuous casting machine for controlling the flow of molten steel in the ingot mold, characterized in that: The F値 shown in the following formula (5) obtained from the casting condition exceeds the optimum F値 corresponding to the optimum flow rate 对应 corresponding to the minimum of the casting powder and the least adhesion to the inclusions of the solidified shell, The moving magnetic field is applied in a manner that the discharge flow of the immersion nozzle supplies a braking force; when the F 値 is less than the optimum F 値 and is higher than the liquid surface lining F ,, the molten steel in the ingot mold is rotated in the horizontal direction. In the manner of applying a moving magnetic field; when the F 値 is not full of the liquid surface, the moving magnetic field is applied in such a manner as to supply an acceleration force to the discharge flow of the immersion nozzle, F Μ = p · QL - Ve · [(l -sin^)/4] · {HD) (5) However, in (5), 'p is the density of molten steel (kg/m3), which is the amount of molten steel injected per unit time (m3/sec) ), Ve is the speed (m / sec) at which the molten steel discharge flow collides with the short side of the ingot mold. The angle (deg) formed at a position where the molten steel discharge flow collides with the short side of the ingot mold, and D is a position where the molten steel discharge flow collides with the short side of the ingot mold to the ingot. The distance (m) from the molten steel surface in the mold. 3 6 · For the flow control method of the molten steel in the ingot mold of claim 35, wherein the above-mentioned optimum F値 is 3·4, and the above-mentioned liquid surface protection F値 is 1.  4. 3 7 · A flow control method for molten steel in an ingot mold as claimed in claim 2, wherein a braking force is supplied at a discharge flow for the submerged nozzle 68 312 / invention specification (supplement) / 92-05 / In the manner of 92104189 1263550, when the moving magnetic field is applied to control the flow rate of the molten steel in the molten steel surface in the ingot mold, the flow rate of the molten steel from the short side of the ingot mold toward the side of the impregnation nozzle is displayed in a positive number to When the negative number indicates the flow rate of the molten steel in the opposite direction, the molten steel liquid at the center of the thickness of the ingot sheet will be separated from the dip nozzle by a quarter of the width of the ingot mold on the short side of the ingot mold. The flow rate of the molten steel of the surface is controlled in the range of -〇· 〇7 m / s to 0 · 0 5 m / sec. 3 8 · The flow control method for the molten steel in the ingot mold according to the scope of claim 2, wherein the F 値 is calculated every time in the casting using the above formula (5), based on the calculated F 値Apply the specified moving magnetic field. 3 9 · A method for controlling the flow of molten steel in an ingot mold, characterized in that the following steps are carried out: In the first step, the thickness of the ingot, the width of the ingot, the casting speed, and the molten steel into the molten steel are obtained as casting conditions. At least five conditions of the inert gas blowing amount and the shape of the immersion nozzle in the outflow hole; the second step, calculating the flow rate of the molten steel in the molten steel surface in the ingot mold based on the obtained casting conditions; The calculated flow rate of the molten steel is compared with the flow rate of the casting powder and the flow rate of the inclusions, and it is determined whether the obtained molten steel flow rate exceeds the flow rate of the casting powder and is lower than the adhesion of the inclusions. Limiting the flow rate; and in the fourth step, when the obtained molten steel flow rate exceeds the casting powder being wound into the threshold flow rate, the moving magnetic field is applied in a manner that the braking force is supplied to the discharge flow of the submerged nozzle, and the obtained molten steel flow rate is not full. Object attachment limit 69 312/Invention manual (supplement)/92-〇5/92 HM1S9 1263550 At the flow rate, the side of the molten steel in the ingot mold is rotated in the horizontal direction. Applying a shifting magnetic field; the molten material to the inner ingot mold steel slab continuous casting machine applied to designated mobile magnetic field to control the molten steel within the ingot mold material flow. 40. a flow control method for molten steel in an ingot mold, characterized in that the following steps are provided: In the first step, the thickness of the ingot piece, the width of the ingot piece, the casting speed, and the inflow hole of the molten steel are obtained as casting conditions. At least 5 conditions of the inert gas blowing amount and the shape of the immersion nozzle; the second step, calculating the flow rate of the molten steel in the molten steel surface in the ingot mold based on the obtained casting conditions; The flow rate of the molten steel is compared with the casting powder impregnated ilL·speed, the inlet flow rate of the inclusions, and the flow rate of the liquid surface. The determined flow rate of the molten steel exceeds the flow rate of the cast powder. It is lower than the flow rate of inclusion adhesion and is lower than the flow rate of the liquid surface; and the fourth step, when the flow rate of the molten steel obtained exceeds the flow rate of the casting powder, the discharge flow is supplied to the immersion nozzle. The dynamic mode applies a moving magnetic field, and when the obtained molten steel flow rate is less than the inclusion adhesion threshold flow rate, and is higher than the liquid surface skinning limit flow rate, the horizontal direction is rotated Applying a moving magnetic field in a manner of melting the steel material in the ingot mold, and applying a moving magnetic field in a manner of supplying an acceleration force to the discharge flow of the submerged nozzle when the obtained molten steel material flow rate is less than the liquid surface coating flow rate; The molten steel in the ingot mold of the continuous casting machine is applied with the specified 70 312 / invention specification (supplement) / 92-05 / 92104189 1263550 to move the magnetic field to control the flow of molten steel in the ingot mold. 4 1 . A flow control method for molten steel in an ingot mold according to claim 39, wherein the steps 1 to 4 are repeatedly performed in casting, and an optimum moving magnetic field is applied to casting conditions at the time point. 42. A flow control device for molten steel in an ingot mold, which is a device for applying a magnetic field to a molten steel in an ingot mold of a steel: 3⁄4 continuous casting machine to control the flow of molten steel in the ingot mold, The method is characterized in that the casting condition obtaining means is provided, and at least five conditions of the thickness of the ingot piece, the width of the ingot, the casting speed, the amount of inert gas blown into the outflow hole of the molten steel, and the shape of the immersion nozzle are obtained as casting conditions; The calculation mechanism calculates the flow rate of the molten steel in the molten steel surface in the ingot mold based on the obtained casting conditions; the determining mechanism calculates the obtained molten steel flow rate and the casting powder into the threshold flow rate and the inclusion adhesion limit The flow rate is compared to determine whether the obtained molten steel flow rate exceeds the flow rate of the cast powder and is lower than the flow rate of the inclusion adhesion limit; the control mechanism, when the obtained molten steel flow rate exceeds the casting powder and enters the threshold flow rate Applying a moving magnetic field in such a manner as to supply a braking force to the discharge flow of the submerged nozzle, and the obtained molten steel flow rate is less than the inclusion adhesion limit At the time of the flow rate, the moving magnetic field is applied to rotate the molten steel in the ingot mold in the horizontal direction; and the moving magnetic field generating means generates a specified moving magnetic field based on the output of the control means. 43 .  - a flow control device for molten steel in an ingot mold, applying a magnetic field to the molten steel in the ingot mold of the steel 71 312 / invention specification (supplement) / 92-05/921 〇 4189 1263550 continuous casting machine An apparatus for controlling the flow of molten steel in an ingot mold, comprising: a casting condition obtaining mechanism, obtaining a thickness of the ingot piece as a casting condition, a width of the ingot piece, a casting speed, and entering the molten steel material outflow hole At least five conditions of the inert gas blowing amount and the shape of the immersion nozzle; the calculation mechanism calculates the flow rate of the molten steel material of the molten steel surface in the ingot mold based on the obtained casting conditions; the determining mechanism, the calculated molten steel material The flow rate is compared with the flow rate of the casting powder, the flow rate of the inclusion adhesion limit, and the flow rate of the liquid surface. It is determined whether the flow rate of the molten steel obtained exceeds the flow rate of the casting powder and is lower than the adhesion of the inclusion. Limiting the flow rate and whether it is lower than the liquid level of the liquid surface; the control mechanism, when the obtained molten steel flow rate exceeds the casting powder, the impregnation flow rate is The discharge flow of the nozzle is applied to the braking force to apply a moving magnetic field, and when the obtained molten steel flow rate is less than the flow rate of the inclusion adhesion limit, and is higher than the flow rate of the liquid surface, the rotation of the ingot mold is performed in the horizontal direction. Applying a moving magnetic field in a manner of melting the steel material, applying a moving magnetic field in such a manner as to supply an acceleration force to the discharge flow of the submerged nozzle when the obtained molten steel flow rate is not full of the liquid surface coating flow rate; and moving the magnetic field generating device based on The output of the control mechanism produces a specified moving magnetic field. 4 4 .  A flow control method for molten steel in an ingot mold, characterized in that: the flow control method of the molten steel in the ingot mold is carried out by the flow control method according to the first application of the patent scope, and at the same time, in the ingot mold Injection intermediate flow 72 312 / invention specification (supplement) / 92-05 / 92104189 1263550 The molten steel in the moving groove draws the solidified shell formed in the ingot mold downward to produce a steel ingot. 73 31W invention manual (supplement) /92-05/92104189