JPH09108796A - Continuous casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cast slab without center segregation by executing casting while controlling fluid of supplied molten steel in a mold with electromagnetic force and executing continuous rolling reduction to unsolidified range of the cast slab to form the optimum unsolidified range, i.e., a crater end shape. SOLUTION: In the case of using two pieces of immersion nozzles 1, each one side hole immersion nozzle 1-1 having one molten steel spouting hole 1a is used and also, arranged so that each of the spouting holes 1a mutually faces to the inside. In the fluid pattern of the molten steel 5 at the time of supplying the electromagnetic force is exerted on the downward stream F1, and the patterns becomes the comparatively intensive descending stream F1 at the center part in the width direction of the cast slab 6 and the ascending stream f1 near the short wall sides. Then the casting is executed so as to obtain the velocity distribution V1, in which the solidified range at the center part in the width direction of the cast slab 6 projects in the projection state toward the casting direction. Therefore, the casting is executed so as not to form such nonuniform solidification completion points as to be recessed toward the casting upstream side at the center part in the width direction of the cast slab and projects toward the downstream side of the casting at both end parts.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a continuous casting method for molten steel.

[0002]

2. Description of the Related Art When a slab is manufactured by a continuous casting method,
Often an internal defect called central segregation is a problem.
This center segregation is the center of the slab in the thickness direction (final solidification part).
Is a phenomenon in which molten steel components such as C, S, P and Mn are positively segregated. This phenomenon is a particularly serious problem in thick plate materials, and is known to cause deterioration in toughness in the segregated portion and hydrogen-induced cracking.

Such center segregation is caused by the fact that unsolidified molten steel (hereinafter referred to as residual molten steel) between dendrite (dendritic) trees at the final stage of solidification is finally solidified due to solidification shrinkage of the molten steel or bulging of the solidified shell. Macroscopically moves toward the solidification completion point of the part, and C, S, P and M
It is known that this occurs due to localized accumulation of molten steel in which n and the like are concentrated.

Therefore, as a countermeasure for preventing the center segregation, there is a method of preventing the movement of the residual molten steel and the accumulation of the concentrated molten steel by reducing the vicinity of the solidification point by some method using a roll, a mold or the like. A method based on the above technical idea has been proposed.

For example, in Japanese Patent Laid-Open No. 63-252655, the surface temperature of the final solidified portion of the cast slab is 700 to 80 by increasing the amount of secondary cooling water sprayed on the surface of the cast slab.
The bulging between rolls is suppressed by increasing the solidification shell thickness within the range of 0 ° C, and a rolling force of a strain rate of 0.2 to 0.4% per minute is applied to the slab with a light rolling roll group. Has proposed a method of preventing the flow of concentrated molten steel and preventing center segregation.

[0006] In the light reduction by the above-mentioned reduction roll group, since it can be reduced only in a dot shape in the longitudinal direction of the slab, solidification shrinkage and bulging cannot be sufficiently prevented. Further, since each reduction acts as a concentrated load, internal cracks are likely to occur at the solidification interface, and there is a drawback that the reduction amount cannot be made large.

The method of continuously forging the slab near the solidification completion point with a flat die has a drawback that the equipment cost becomes very high. As a method for solving this, a continuous casting method has been proposed in JP-A-61-42460.

In the method disclosed in the above-mentioned JP-A-61-42460, the dendrite is cut by the flow of molten steel by using an electromagnetic stirrer or an ultrasonic wave applying device installed on the upstream side of the solidification completion point, and the like near the solidification completion point. After the axial crystal zone is formed, a large reduction of 3 mm or more is given by the pair of reduction rolls arranged immediately before the solidification completion point to forcibly form the solidification completion point and the center is formed without causing internal cracking. It is intended to eliminate segregation.

[0009]

However, in the conventional center segregation improving method described above, no matter whether roll rolling or die rolling is adopted, when there is uneven solidification in the width direction of the slab, Since there is no uniform reduction in the width direction of the slab, there is a drawback that the center segregation deteriorates at both ends in the width direction of the slab where the solidification is delayed. This problem will be described in detail with reference to FIG.

FIG. 4 is a view for explaining the progress of solidification in a conventional curved type continuous casting apparatus in which the molten steel is supplied to one place in the mold and a molten steel flow direction control device is not provided. 4 (a) is a vertical cross-sectional view of the main part of the mold and its peripheral portion, FIG. 4 (b) is a perspective view showing the immersion nozzle, the slab and the progress of solidification thereof, and FIG. ) [C]
FIG. 4D is a cross-sectional view of the slab at the position, and FIG. 4D is a cross-sectional view of the slab after the solidification of the slab is completed.

In FIG. 4, 1'-2 is a two-hole immersion nozzle, 1'a is a molten steel discharge hole, 2 is a mold, 5 is molten steel, 6'is a slab, W is a mold width, A is a center segregation, and B. Is an unsolidified region (residual molten steel part), SH is a solidified shell, CE 'is a solidification completion point, F
od is a molten steel downflow, Fou is a molten steel upflow that rises in the center of the slab 6 ', and Fo is a large molten steel circulation downflow.

In FIG. 4 (b), the wavy line with an arrow shows the solidification rate distribution at the central portion in the thickness direction of the corresponding portion of the cast slab 6 '.

The solidification of the molten steel 5 is such that the flow of the residual molten steel is an upward flow (Fou) as shown in FIG. 4 (b) even if cooling is uniform in the widthwise direction of the slab 6 '. It is fast in the central part, slow in the width direction end part which is a down flow (Fod), and progresses unevenly in the width direction.

When there is uneven solidification in the width direction of the slab 6 ', as shown in FIG. 4 (c), the width center portion (1/4
When the solidification progresses slowly at the width end (1/4 width to edge side, 3/4 width to edge side) compared to (width to 3/4 width), uniform reduction in the width direction of the slab 6 '. Therefore, the center segregation A shown in FIG. 4 (d) becomes worse at both ends in the width direction of the slab where the solidification is delayed.

The uneven solidification in the width direction of the cast slab 6'is usually caused by the two molten steel discharge holes 1'a located outside in the width direction of the cast slab 6'in the conventional method shown in FIG. 4 (a). It occurs because the two-hole immersion nozzle 1'-2 formed slightly downward is used. That is, when the molten steel 5 is discharged from the two-hole immersion nozzle 1′-2 into the mold 2, the downflow Fod (FIG. 4 (b)) descending along the short side of the cast piece 6 ′ and the cast piece 6 ′. A large circulating downward flow Fo (FIG. 4 (a)) composed of an upward flow Fou (FIG. 4 (b)) rising in the center is formed in the unsolidified region B, and this circulating downward flow Fo causes the slab 6 ' This is because uniform cooling becomes impossible.

As a result, the thickness of the solidified shell SH in the final solidified portion of the unsolidified region B becomes thicker in the widthwise central portion of the cast slab 6'and thinner in both end portions as shown in FIG. 4 (c). .

Therefore, as shown in FIG. 4 (b), the shape of the solidification completion point CE 'is recessed in the casting upstream side at the widthwise center of the cast piece 6', and at the casting downflow side at both ends. And it becomes uneven.

In this state, if the cast piece 6'is subjected to unsolidified rolling, the amount of reduction corresponding to the solidification shrinkage cannot be obtained at both widthwise end portions of the cast piece 6 ', and the concentrated molten steel flows into both end portions. , The central segregation A shown in FIG. 4 (d) is generated.

Japanese Unexamined Patent Publication (Kokai) No. 5-185186 proposes a method of eliminating such nonuniform solidification in the width direction of the cast piece to improve center segregation. This will be described with reference to FIG.

FIG. 5 is a cross-sectional view of the slab and the mold.
As shown in the drawing, a concave portion 2b having a depth of 1.0 to 5.0 mm is formed in the widthwise center of the slab 6'of the long side 2a of the mold 2 over a range of 50 to 80% of the length of the long side 2a. The slab 6 ′ is formed by the convex portion formed in the widthwise center of the slab 6 ′.
The thickness of the residual molten steel portion B is ensured evenly across the width direction of the.

However, in order to obtain a sufficient effect by this method, it is necessary to set the projection of the cast slab to 3 mm or more, which makes it difficult to set the pass line of the cast slab, and also, in the step portion. Internal cracking of the slab is likely to be induced by slab bulging.

Another method for improving center segregation is to add electromagnetic stirring within a specific range (Japanese Patent Laid-Open No. 63-157749).
Japanese Patent Application Publication) or a method of applying ultrasonic vibration to a slab (Japanese Patent Laid-Open No. HEI-1)
No. 113,157), but in any case, there was no fundamental solution when there was uneven solidification in the width direction of the slab.

The present invention has been made to solve the above problems. The object of the present invention is to eliminate the flow of molten metal (direction and flow velocity), in particular, the uneven solidification in the width direction of the slab due to the downward flow along both short sides of the slab, and to optimize the unsolidified region, that is, the crater end. An object of the present invention is to provide a continuous casting method capable of obtaining a slab without center segregation by forming a shape.

[0024]

The gist of the present invention resides in the following continuous casting method.

When continuously producing cast slabs by cooling the molten steel supplied into the mold while cooling, the molten steel is supplied to the mold at two or more positions in the width direction of the slab, and the molten steel is supplied into the mold. A continuous casting method, characterized in that casting is performed while controlling the internal flow with an electromagnetic force, and the unsolidified region of the slab is continuously rolled down.

A desirable upper limit of the supply location of the molten steel into the mold is about 10 locations.

According to the present invention, in order to prevent the segregation of trace elements found in the center of the cast slab and obtain a homogeneous product, two or more supply locations of the molten steel into the mold are provided in the width direction of the cast slab, and an electromagnetic field is provided. By controlling the molten steel flow (direction and flow velocity) using force, the shape of the solidification completion point is made appropriate, and the thickness of the solidified shell in the unsolidified region of the slab is made uniform in the slab width direction while The solidification region is continuously rolled down.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION A configuration example of an apparatus for carrying out the method of the present invention will be described with reference to FIG.

FIG. 1 is a diagram showing an example of the construction of a bending type continuous casting apparatus for carrying out the method of the present invention.

FIG. 1 (a) is a schematic vertical cross-sectional view in the side direction, FIG.
(b) is a schematic vertical cross-sectional view in the front direction of only the peripheral portion of the mold. In this example, as shown in the drawing, two molten steel supply points (two dipping nozzles 1), a mold 2, an electromagnetic brake 3 near the meniscus of the molten steel 5 in the mold 2, an electromagnetic brake 4 immediately below the mold 2, and a support roll group. 7, a reduction roll group 8 and a pinch roll 9. Electromagnetic brakes 3 and 4
Is a device provided to control the flow direction and flow velocity of the molten steel 5 supplied into the mold 2 from the two immersion nozzles 1.

In this apparatus, the molten steel 5 is supplied into the mold by the immersion nozzle 1 and the solidified shell SH is formed by the primary cooling of the mold 2. Solidification of the cast slab 6 is promoted by secondary cooling with spray water or the like in the subsequent support roll group 7, complete solidification within the range of the reduction roll group 8, and pulled out by the pinch roll 9.

At this time, in the final stage of coagulation, the uncoagulated region B
The cast slabs 6 having No. 1 are pressed by the pressing roll group 8 and a pressing amount corresponding to the solidification shrinkage amount is applied to prevent inflow and accumulation of the concentrated molten steel and prevent center segregation.

The method of the present invention will be described in detail below with reference to FIGS.

FIG. 2 is a diagram for explaining the progress of solidification in the case of the continuous casting apparatus shown in FIG. Fig. 2 (a) is a vertical cross-sectional view of the main part of the mold and its peripheral portion, Fig. 2 (b) is a perspective view showing the dipping nozzle, the slab and the progress of its solidification, and Fig. 2 (c) is Fig. 2 (b FIG. 7B is a transverse cross-sectional view of the cast piece at the position [C] shown in FIG.

As shown in FIG. 2 (a), the immersion nozzle 1 is
In the case of this use, the single-hole immersion nozzle 1-1 having one molten steel discharge hole 1a is provided, and each discharge hole 1 is provided.
It is arranged so that a faces inward and faces each other. Reference numerals 3 and 4 are the electromagnetic brakes shown in FIG.

In FIGS. 2 (a) and 2 (b), f1 is the molten steel upflow at the widthwise end (near the short side) of the cast slab 6, F1
Is a relatively strong downward flow in the widthwise central portion of the slab 6, f3 is an upward flow toward the meniscus opposite to the downward flow F1, V1
Means a velocity distribution in which solidification at the widthwise center of the slab 6 proceeds in a convex shape in the casting direction (downstream).

In the method of the present invention, as shown in FIG. 2 (a), the flow pattern of the molten steel 5 at the time of supply is such that a relatively strong downward flow F1 at the widthwise central portion of the slab 6 and an upward flow f1 near the short side. Therefore, casting is performed so that the solidification of the widthwise central portion of the slab 6 proceeds in a convex shape in the casting direction (downstream) to obtain a velocity distribution V1.

That is, due to the action of the relatively strong downward flow F1 in the widthwise central portion of the slab 6, as shown in FIG. 2 (b), one convex shape is formed in the widthwise central portion toward the downstream side. A solidification completion point CE having is formed, and as shown in FIG. 4 (b),
Solidification completion point CE 'where the center of the slab width direction is recessed upstream of casting and both ends are projected downstream of casting to be uneven
The casting is performed so that no pits are formed.

FIG. 2 (c) shows the situation in which the thickness of the solidified shell SH in the final solidification portion of the slab 6 is thin at the central portion in the width direction of the slab and thick at both ends due to the above effects. FIG.

In the method of the present invention, the electromagnetic force is used to effectively achieve the above-mentioned casting condition even under various casting conditions.

That is, the throughput (throughput =
(Mold width × mold thickness × casting speed) increases, the discharge flow rate from the dipping nozzle 1 increases, and the downward flow F1 formed after each discharge flow collides with each other becomes too large. As a result, a solidification completion point is formed which is extremely uneven and protrudes downstream of the casting. FIG.
In the case of the casting condition shown in (b), the downward flow F1 is the solidified shell S.
A collision such as a breakout occurs due to the collision with the lower (ground) side of H and remelting of the solidified shell SH.

In order to solve the above problem, an electromagnetic force is applied to the downward flow F1 to control the downward flow F1 so that the flow velocity does not exceed a certain value. The desirable flow rate range of F1 is about 0.3 to 2.5 times the casting speed.

When an electromagnetic brake using a DC magnetic field is used, an eddy current is induced by the interaction between the static magnetic field and the downward flow F1, and the interaction between the induced eddy current and the applied magnetic field is opposite to the downward flow F1. The Lorentz force acts in the direction to give a braking force to the downward flow F1.

When a moving magnetic field by alternating current is used as an electromagnetic brake, an electromagnetic force acts in the direction of the moving magnetic field, and driving or braking can be selected for the downward flow F1.

By controlling the flow velocity of the downward flow F1 by the electromagnetic force in this manner, the thickness of the solidified shell SH in the final solidified portion of the unsolidified region B is equal to that of the slab 6 as shown in FIG. 2 (c). It becomes thinner at the center in the width direction and thicker at both ends, and the cross-sectional shape of the unsolidified region B becomes an optimal spindle type.

When the upward flow f3 (see FIG. 2 (a) and FIG. 2 (b)) toward the meniscus opposite to the downward flow F1 becomes large, longitudinal cracking due to local solidification delay due to the upward flow f3 occurs. Occurrence or operation troubles such as powder entrainment due to fluctuations in the molten metal level occur. In order to prevent these operational troubles, it is also important to apply an electromagnetic force near the meniscus.

The optimum position for applying the electromagnetic force is determined at a predetermined position from the meniscus to the solidification completion point where solidification is completed, depending on the number of dipping nozzles, dipping depth, discharge hole shape, discharge angle and the like.

Next, an example of using three or more immersion nozzles in the method of the present invention will be described.

FIG. 3 is a diagram for explaining the progress of coagulation when five dipping nozzles are used.

FIG. 3 (a) is a vertical cross-sectional view of the main part of the mold and its peripheral portion, and FIG. 3 (b) is a perspective view showing the immersion nozzle, the slab, and the progress of solidification thereof. In this way, dip nozzle 3
In the case of using more than one pipe, only two pipes at both end portions in the width direction of the cast slab 6 are used as the single-hole dipping nozzles 1-1, and the respective discharge holes 1a are arranged toward the inside. On the other hand, the other submerged nozzle in the middle part is a normal two-hole submerged nozzle 1'-2, and the ejection holes 1'a are arranged so that the direction thereof matches the width direction of the mold 2.

In FIG. 3, f2 is an ascending flow of molten steel at the widthwise end of the slab 6, F2 is a relatively uniform downward flow at the widthwise center of the slab 6, and V2 is the width of the slab 6. It means a velocity distribution in which solidification at the center of the direction proceeds in a smooth convex shape in the casting direction.

As shown in FIG. 3 (a), in the molten steel flow pattern in this case, a plurality of opposed discharge holes 1a and 1'are provided.
The discharge flow from a collides, the flow velocity is reduced more than in the case of FIG. 2, and the descending flow F2 becomes a descending flow that is relatively uniform in the width direction of the slab, and the solidification of the width direction central portion of the slab 6 occurs. A velocity distribution V2 is obtained which progresses in a smooth convex shape downstream. Due to the action of the relatively uniform downward flow F2 in the widthwise central portion of the slab 6, as shown in FIG. 3 (b), a smooth convex shape toward the downward flow in the widthwise central portion of the slab 6 is obtained. A solidification completion point CE is formed. Therefore, also in this case, similarly, as shown in FIG. 4 (b), a dent is formed at the center in the width direction of the slab toward the casting upstream side,
The solidification completion points CE ′ that project to the casting downstream side at both ends and become uneven are not formed.

A desired upper limit of the molten steel supply position into the mold, that is, when there are a plurality of dipping nozzles, is about 10 positions.

The reason for utilizing the electromagnetic force is the same as that described above, but the more the number of immersion nozzles used, the more uniform the downflow F2, and the smaller the electromagnetic force required.
For this reason, the electromagnetic field generator is a relatively small facility,
Workability can be improved and manufacturing cost can be reduced.

In the method of the present invention, the same effect as described above can be obtained not only by the curved continuous casting apparatus but also by the vertical type as long as the apparatus has the structure as shown in FIG.

Furthermore, in the method of the present invention, it is desirable that the following conditions be satisfied.

[Immersion Nozzle] Body inner diameter: 30 to 150 mmφ Discharge hole shape: 20 to 150 mm × 20 to 150 mm square for two holes and one hole Discharge angle: 15 ° to 15 downward for two holes and one hole ° Nozzle distance: 100 to 2000 mm [Electromagnetic brake] Near meniscus: Range 50 mm × 200 mm to 300 mm × 3000 mm Magnetic field strength 0.15 to 0.50 Tesla Directly below the mold: Range 50 mm × 200 mm to 300 mm × 3000 mm Magnetic field strength 0.15 to 1.0 Tesla [Mold] Mold Width: 400 to 3000 mm Mold thickness: 90 to 350 mm [Casting speed] 0.4 to 3.0 m / min [Unsolidified reduction] Reduction zone length: 1.0 to 10 m Reduction gradient: 0.2 to 30 mm / m

[0058]

EXAMPLE Carbon steel for thick plates was prepared by using the method of using two dipping nozzles as shown in FIGS. 1 and 2 and the method of using five dipping nozzles as shown in FIG. 3 in the apparatus shown in FIG. A slab was cast.

Specific casting conditions for the above test are shown below.

(1) Equipment specifications, casting conditions Continuous casting machine: Curved continuous casting machine (curving radius: 12.5 m) Slab size: thickness 250 mm x width 2000 mm Steel type: [C] = 0.15 to 0.20% For thick plate 40 kg steel Molten steel Superheat: 20 ° C Casting speed: 1.0 m / min Unsolidified final stage of solidification Rolling down: Length of rolling zone 5 m Rolling down gradient 1.0 mm / m (2) Specifications of molten steel supply system (a) Inventive Example 1 (Fig. 2) In the case of the structure shown in (a)) Nozzle body inner diameter: 85 mmφ Discharge hole shape: 80 × 80 mm square Discharge angle: 5 ° downward Nozzle distance: 1500 mm (b) Inventive Example 2 (of the structure shown in FIG. 3 (a)) Case) Nozzle body inner diameter: 85 mmφ Discharge hole shape: 80 × 80 mm square Discharge angle: 5 ° downward Nozzle distance: 400 mm (3) Electromagnetic brake specifications (a) Inventive example 1 (of the structure shown in FIG. 2 (a)) Case) Near the meniscus: Range 200 mm × 2300 mm Magnetic field strength 0.3 Tesla Directly under the mold: Range 500 mm × 2300 mm Magnetic field strength 0.4 Tesla (b) Inventive Example 2 (Figure) In the case of the structure shown in 3 (a)) Near the meniscus: Range 200 mm × 2300 mm Magnetic field strength 0.15 Tesla Directly under the mold: Range 500 mm × 2300 mm Magnetic field strength 0.25 Tesla As a comparative example, continuous casting with one conventional two-hole immersion nozzle with the following structure And in this case as well, by the group of rolling rolls,
Under the same conditions as in the examples of the present invention, uncoagulated light reduction at the final stage of coagulation was performed.

Nozzle body inner diameter: 85 mmφ Discharge hole shape: 80 × 80 mm square Evaluation was carried out by cutting the obtained slab in a cross section perpendicular to the casting direction, collecting a test piece from the center in the thickness direction, and measuring the surface of this sample. Was divided into coarseness of 200 μm mesh, the average concentration P of [P] in each mesh was examined, and compared with the [P] concentration P _{0 of} the mother molten steel to investigate the segregation degree distribution. Table 1
The results are shown in FIG.

[0062]

[Table 1]

In the example of the present invention, by controlling the flow of molten steel supplied into the mold, the shape of the solidification completion point of the slab is improved, and the rolling in the non-solidified region of the slab is effectively performed. As described above, the center segregation of the portion close to the slab edge was significantly improved as compared with the comparative example, and the slab having a uniform composition in the width direction could be manufactured.

[0064]

According to the method of the present invention, the shape of the solidification completion point of the slab is controlled and optimally improved by forming an appropriate downward flow in the central portion of the slab in the unsolidified region in the width direction of the slab. However, reduction in the unsolidified region of the cast piece can be effectively performed. As a result, it is possible to manufacture a slab with a uniform composition in the entire width direction of the slab and without center segregation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a curved continuous casting apparatus for carrying out the method of the present invention. (a) is a schematic vertical cross-sectional view in the side direction, and (b) is a schematic vertical cross-sectional view in the front direction only around the mold.

FIG. 2 is a diagram for explaining the progress of solidification in the case of the continuous casting device shown in FIG. (a) is a vertical cross-sectional view of the mold and the main part of its periphery, (b) is a perspective view showing the immersion nozzle, the cast piece and the progress of its solidification, (c) is shown in (b) [C]
It is a cross-sectional view of the slab at the position.

FIG. 3 is a diagram for explaining the progress of solidification when five immersion nozzles are used. (a) is a vertical cross-sectional view of the mold and its peripheral part, and (b) is a perspective view showing an immersion nozzle, a slab, and progress of solidification thereof.

FIG. 4 is a diagram for explaining the progress of solidification in a conventional curved continuous casting apparatus. (a) is a vertical cross-sectional view of the main part of the mold and its peripheral portion, (b) is a perspective view showing the immersion nozzle, the slab and the progress of its solidification, (c) is the [C] position shown in (b). FIG. 3 (d) is a cross-sectional view of the slab after the solidification of the slab is completed.

FIG. 5 is a cross-sectional view of a cast product and a mold showing a conventional method for eliminating uneven solidification in the cast product width direction.

[Explanation of symbols]

1: Immersion nozzle, 1-1: Single hole immersion nozzle, 1'-2:
2-hole immersion nozzle, 1a, 1'a: Molten steel discharge hole, 2: Mold, 2a: Mold long side, 2b: Recessed part, 3: Electromagnetic brake installed near the meniscus, 4: Electromagnetic brake installed directly under the mold, 5 : Molten Steel, 6, 6 ': Cast Piece, 7: Support Roll Group, 8: Rolling Roll Group, 9: Pinch Roll, A: Center Segregation, B: Unsolidified Region (Residual Molten Steel Part), CE, CE': Solidified Completion point, SH: solidified shell,
W: Mold width, f1, f2, f3, Fou: Molten steel upflow, F1, F2, Fod: Molten steel downflow, Fo: Molten steel circulation downflow, V1, V2: Solidification velocity distribution

Claims (1)

[Claims] 1. When continuously producing cast slabs by cooling the molten steel fed into the mold while cooling, the molten steel is fed into the mold at two or more locations in the width direction of the cast slab. The continuous casting method is characterized in that casting is performed while controlling the flow in the mold by electromagnetic force, and the unsolidified region of the slab is continuously pressed.