WO2020158465A1 - Procédé de commande de dispositif de buse coulissante et procédé de fabrication de dalle - Google Patents

Procédé de commande de dispositif de buse coulissante et procédé de fabrication de dalle Download PDF

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Publication number
WO2020158465A1
WO2020158465A1 PCT/JP2020/001590 JP2020001590W WO2020158465A1 WO 2020158465 A1 WO2020158465 A1 WO 2020158465A1 JP 2020001590 W JP2020001590 W JP 2020001590W WO 2020158465 A1 WO2020158465 A1 WO 2020158465A1
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WIPO (PCT)
Prior art keywords
molten steel
nozzle
sliding
ladle
nozzle hole
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PCT/JP2020/001590
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English (en)
Japanese (ja)
Inventor
亮祐 三原
篤 熊谷
長谷川　貴士
佑介 渡邉
山内　崇
上原　博英
Original Assignee
Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN202080011512.1A priority Critical patent/CN113365759B/zh
Priority to JP2020520082A priority patent/JP6733854B1/ja
Publication of WO2020158465A1 publication Critical patent/WO2020158465A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection

Definitions

  • the present invention relates to a method for controlling a sliding nozzle device and a method for manufacturing a slab.
  • Some molten steel (molten metal) holding containers, such as tundish and ladle, used in the steelmaking process of steelworks have a sliding nozzle device installed at the bottom.
  • the sliding nozzle device installed at the bottom of the ladle is generally used to prevent the molten steel from entering and solidifying into the nozzle hole until the start of pouring, etc. Is filled. Since this clogging sand causes a decrease in cleanliness in casting of high cleanliness steel, there is a case where an operating method is performed in which the clogging sand is once discharged and then casting is performed.
  • the sliding nozzle device is opened in a state where the ladle is placed at the sand discharging position, and the sand and a part of the molten steel are taken out from the ladle. Then, the sliding nozzle device is closed to stop the pouring of the molten steel. Further, the ladle is placed at the casting position where casting is performed, and the sliding nozzle device is opened to take out the molten steel from the ladle and transfer the molten steel to the tundish or the mold. Then, the cast molten steel is solidified to produce a slab having a predetermined cross-sectional shape.
  • a plate is intermittently operated at the initial opening in a sliding nozzle device of a tundish, and gas is blown from the plate into the nozzle holes. (Hereinafter, also referred to as “gas bubbling”) is disclosed.
  • Patent Document 1 is a technique for initial opening in a tundish sliding nozzle device, and not for re-pouring of a ladle sliding nozzle device. Further, in Patent Document 1, it is preferable that the gas bubbling time is short, but even if the gas bubbling is performed in the ladle at this time, non-open holes are unavoidably generated at a constant frequency. ..
  • the present invention has been made by paying attention to the above-mentioned problems, and it is possible to suppress the generation of non-open holes at the time of re-pouring of molten steel in a ladle, a control method for a sliding nozzle device, and a casting method. It is intended to provide a method for manufacturing a piece.
  • a sliding nozzle device control method for pouring the molten steel from a ladle containing molten steel through a sliding nozzle device provided in the ladle, wherein the sliding nozzle is provided.
  • the device comprises an upper plate provided on the lower surface of an upper nozzle fixed to the bottom of the ladle and having a first nozzle hole, and a sliding plate provided on the lower surface of the upper plate and having a second nozzle hole.
  • the sliding plate has the second nozzle hole that does not overlap the first nozzle hole from the open position in which at least a part of the second nozzle hole overlaps the first nozzle hole.
  • the plate is configured to be movable up to a closed position where the first nozzle hole is closed by sliding on the lower surface of the upper plate, and an inert gas is blown to the first nozzle hole at the closed position.
  • the sliding plate In the state in which the molten steel is stored in the ladle, the sliding plate is set to the open position, and the gas is introduced through the first nozzle hole and the second nozzle hole.
  • a pouring step of pouring out a part of the molten steel from the pan and after the pouring step, the sliding plate is moved to the closed position, and the gas is injected from the gas injection hole through the first nozzle hole.
  • a method for controlling a sliding nozzle device is provided, in which the flow rate of the above-mentioned inert gas blown in is 3.9 Nm 3 /(min ⁇ m 2 ) or more and 26.0 Nm 3 /(min ⁇ m 2 ) or less. It
  • the molten steel is poured out through a sliding nozzle device provided in the ladle, and the poured molten steel is cast.
  • a method for manufacturing a slab which comprises casting the molten steel poured in the re-pouring step by using the method for controlling the sliding nozzle device described above.
  • the above-mentioned problems are taken into consideration, and it is possible to suppress the generation of non-open holes when re-pouring molten steel in a ladle, the control of a sliding nozzle device.
  • Methods and methods of making slabs are provided.
  • the slab manufacturing method according to the present embodiment is intended for a manufacturing method in a continuous casting facility which is a casting facility for continuously casting the molten steel 4 contained in the ladle 1 shown in FIGS. 1 and 2.
  • the ladle 1 is a molten steel holding container that contains the molten steel 4 and the slag 5.
  • the molten steel 4 contained in the ladle 1 has been subjected to refining treatment with predetermined components and temperatures in advance. Further, in the present embodiment, it is preferable that the steel type of the molten steel 4 is a high cleanliness steel such as a bearing steel.
  • the ladle 1 is provided with an upper nozzle 2 and a sliding nozzle device 3.
  • the upper nozzle 2 is a refractory nozzle fixed to the bottom of the ladle 1.
  • the sliding nozzle device 3 is a nozzle mechanism provided on the lower surface of the upper nozzle 2, and has an upper plate 31, a sliding plate 32, and a lower nozzle 33.
  • the upper plate 31 is a plate made of refractory material, and has a circular first nozzle hole 311 that is opened in the vertical direction (vertical direction in FIGS. 1 to 4) which is the vertical direction in the plate surface.
  • the upper plate 31 is fixedly provided on the lower surface of the bottom of the ladle 1, and the circular hole of the upper nozzle 2 and the first nozzle hole 311 are provided so as to be concentric with each other when viewed from above and below.
  • the hole diameter of the upper nozzle 2 is substantially the same as the hole diameter of the first nozzle hole 311, and also the hole diameters of the second nozzle hole 321 and the lower nozzle 33, which will be described later.
  • the sliding plate 32 is a refractory plate, and has a circular second nozzle hole 321 opened vertically in the plate surface and a gas blowing hole 322.
  • the sliding plate 32 is provided on the lower surface of the upper plate 31, and is configured to be movable in the horizontal direction (the horizontal direction in FIGS. 1 to 4) by sliding on the lower surface of the upper plate 31.
  • the sliding operation of the sliding plate 32 is performed by a sliding mechanism (not shown) such as a cylinder.
  • the gas blowing hole 322 is provided at a position separated from the second nozzle hole 321 by a predetermined distance in the sliding direction of the sliding plate 32.
  • One end of the gas blowing hole 322 opens on the upper surface of the sliding plate 32, and the other end is connected to a gas supply device (not shown).
  • a gas blowing hole 322 when Ar gas is supplied from the gas supply device, the gas is injected from the upper surface of the sliding plate 32 where one end of the gas blowing hole 322 is formed.
  • the gas injection hole 322 is not particularly limited in shape as long as the molten steel 4 is unlikely to enter the inside and the Ar gas can be injected.
  • the gas blowing hole 322 may have a slit shape, a porous shape, or the like.
  • the gas injection hole 322 overlaps with the first nozzle hole 311 when viewed from above and below, and the sliding plate 32 closes the first nozzle hole 311.
  • the position of the moving plate 32 is set to the closed position.
  • the position of the sliding plate 32 in which at least a part of the second nozzle hole 321 overlaps with the first nozzle hole 311 when viewed from above and below is defined as an open position.
  • the sliding nozzle device 3 is in the closed state when the sliding plate 32 is in the closed position, and the sliding nozzle device 3 is in the open state when the sliding plate 32 is in the open position. That is, the sliding plate 32 is configured to move at least from the open position to the closed position by sliding on the lower surface of the upper plate 31.
  • the sliding plate 32 can be moved in the sliding direction at the open position to adjust the overlapping margin, which is the region where the second nozzle hole 321 and the first nozzle hole 311 overlap.
  • the overlapping margin is the region where the second nozzle hole 321 and the first nozzle hole 311 overlap.
  • the lower nozzle 33 is a refractory nozzle.
  • the lower nozzle 33 is a lower surface of the sliding plate 32, and is fixedly provided at a position where the circular hole of the lower nozzle 33 and the second nozzle hole 321 concentrically overlap each other when viewed from the up and down direction.
  • the sliding nozzle device 3 is closed, and as shown in FIG. 1, the upper nozzle 2 and the first nozzle hole of the ladle 1 are connected.
  • the inside of 311 is in a state where the filling sand 6 is contained.
  • the plugging sand 6 is for preventing opening failure at the time of initial opening of the ladle 1, and prevents solidification of the molten steel 4 in the upper nozzle 2 and the first nozzle hole 311.
  • a pouring process for discharging the filling sand 6 is performed before starting casting.
  • the sliding plate 32 is moved to the open position to open the sliding nozzle device 3 to open the sand 6 Is exhausted.
  • a part of the molten steel 4 is poured out together with the filling sand 6.
  • all of the filling sand 6 is discharged from the ladle 1, and the sliding nozzle device 3 may be warmed by the sensible heat of the poured molten steel.
  • the pouring time which is the time for pouring a part of the molten steel from the ladle 1, is preferably 5 seconds or more and 13 seconds or less.
  • the pouring time is 5 seconds or more, the sliding nozzle device 3 is warmed to the extent that molten steel does not solidify in the sliding nozzle device 3 in the re-pouring process.
  • the pouring time exceeds 13 seconds, the amount of molten steel that is poured out will be too large, and the yield reduction cannot be ignored, for example, the yield of cast slabs relative to molten steel will be less than 99%.
  • the sliding plate 32 is moved to the closed position to close the sliding nozzle device 3, and Ar gas is blown from the gas blowing hole 322 (gas bubbling is performed) to perform the gas blowing process. Be seen.
  • Ar gas is blown into the molten steel 4 in the ladle 1 through the gas blowing hole 322 for a predetermined time or longer.
  • the time for blowing the Ar gas is also referred to as the blowing time or the bubbling time.
  • the Ar gas blown from the gas blowing hole 322 moves upward into the ladle 1 through the first nozzle hole 311 and the upper nozzle 2, and stirs the molten steel 4 contained in the ladle 1.
  • blowing flow rate is the volume blown in per unit of Ar gas time, 3.9 nm per nozzle Anadan area of the upper nozzle 3 / (min ⁇ m 2) or more 26.0Nm 3 / (min ⁇ m 2 ) below.
  • the nozzle diameter of the upper nozzle 2 is 70 mm
  • the nozzle hole cross-sectional area of the upper nozzle 2 is 3.8 ⁇ 10 ⁇ 3 m 2
  • the flow rate of Ar gas blown from the upper nozzle 2 per unit time is , 15 NL/min or more and 100 NL/min or less.
  • the molten steel 4 When the blowing flow rate of Ar gas is less than 3.9 Nm 3 /(min ⁇ m 2 ), the molten steel 4 easily flows into the sliding nozzle device 3 after the clogging sand is discharged and solidifies.
  • the flow rate of the Ar gas blown exceeds 26.0 Nm 3 /(min ⁇ m 2 )
  • the flow velocity of the Ar gas blown into the sliding nozzle device 3 becomes high, so that the sliding that accompanies the Ar gas occurs.
  • the molten steel flow in the vicinity of the nozzle device 3 is accompanied by turbulent vortices. In this case, a stagnation part of the molten steel flow is formed in a region adjacent to the turbulent vortex, and the molten steel 4 in this part easily solidifies.
  • the flow rate of Ar gas per nozzle hole cross-sectional area of the upper nozzle is set within a suitable range, and the flow rate of Ar gas per unit time is set regardless of the nozzle hole cross-sectional area of the upper nozzle. It is preferably 15 NL/min or more and 100 NL/min or less, and more preferably 15 NL/min or more and 50 NL/min or less.
  • the flow rate of Ar gas is less than 15 NL/min, the stirring force is too small, so that the blowing time must be lengthened, which may lead to a decrease in productivity and an increase in manufacturing cost to compensate the molten steel temperature. There is a nature.
  • the flow rate of Ar gas is more than 50 NL/min
  • the temperatures of the first nozzle hole 311 and the upper nozzle 2 are lowered by cooling the first nozzle hole 311 and the upper nozzle 2, and the first nozzle hole 311 is cooled.
  • the molten steel 4 may solidify and adhere in the upper nozzle 2.
  • the flow rate of Ar gas is more than 100 NL/min
  • the swing of the bath surface becomes large, and the work of moving the ladle 1 from the packed sand discharge position to the casting position where continuous casting is performed is accompanied with the blowing of Ar gas. Become dangerous. Further, there is a concern that the cleanliness of the molten steel 4 may be deteriorated due to slag inclusion.
  • the molten nozzle 4 is temporarily closed to stop the pouring of the molten steel 4 and then opened to restart the pouring of the molten steel 4. Doing is also called re-pouring.
  • Blowing time in the gas blowing step is 1/4 or more uniform mixing time of the molten steel 4 in the ladle 1 by stirring the Ar gas t m (s).
  • Uniformly mixing time t m is an agitation by Ar gas powered ⁇ (W / T), is a calculated value obtained from a bath shape of the molten steel 4 in the ladle 1.
  • the value obtained by the following equation (1) is used as the stirring power ⁇ .
  • ⁇ is the stirring power (W/T)
  • V g is the flow rate of the Ar gas blown (Nm 3 /min)
  • T 1 is the temperature (K) of the molten steel 4
  • W is the molten steel 4.
  • weight (t) h v denotes blowing depth (Yokufuka of) (m)
  • P a is atmospheric pressure (Pa)
  • T 0 is the standard state temperature (K), respectively.
  • h v is Yokufuka of (m)
  • d v denotes the bath diameter (m) to each.
  • (2) homogeneously mixing time t m required by the formula are those calculated by simulating the ladle 1 shown in FIGS. 1 and 2 as a bottomed cylindrical shape. That is, the bath depth h v indicates the vertical depth of the molten steel 4 contained in the ladle 1, and the bath diameter d v is the average of the inner diameters of the truncated cone ladle 1 in the region containing the molten steel 4. Indicates a value.
  • Patent Document 1 describes that in a tundish sliding nozzle device, increasing the gas bubbling time leads to solidification of molten steel.
  • the sliding nozzle device 3 of the ladle 1 the results of investigating the relationship between blowing time and not opening, less than 1/4 of the blowing time is uniform mixing time t m and shorter It was found that the probability of denudation increases in. It is estimated that this is due to the following phenomenon. In gas bubbling in the ladle 1, as shown in FIG. 3, when the blowing time is short, the molten steel 4 is not sufficiently stirred, and a large temperature gradient is generated in the molten steel 4 between the top and bottom of the ladle 1.
  • the temperature inside the upper nozzle 2 and the inside of the first nozzle hole 311 decreases, and the possibility that the solidification of the molten steel 4 progresses increases, so that the probability that a non-open hole will occur increases.
  • the molten steel 4 is sufficiently stirred, so that the temperature of the molten steel 4 is made uniform at the top and bottom of the ladle 1. For this reason, the temperature inside the upper nozzle 2 and the inside of the first nozzle hole 311 increases, and the solidification of the molten steel 4 is suppressed, so that the generation of non-open holes is suppressed.
  • the upper limit of the blowing time is preferably set to 2/5 or less of the uniform mixing time.
  • the blowing of Ar gas blowing time it is sufficient that 1/4 or more uniform ⁇ between t m as results.
  • the ladle 1 is moved from the packed sand discharging position to the casting position where continuous casting is performed together with the blowing of Ar gas.
  • a re-pouring step of pouring the molten steel 4 from the ladle 1 is performed.
  • the sliding plate 32 is moved to the open position to open the sliding nozzle device 3, thereby opening the upper nozzle 2, the first nozzle hole 311, and the like.
  • Molten steel 4 is poured from the ladle 1 through the second nozzle hole 321 and the lower nozzle 33. Then, the poured molten steel 4 is continuously cast.
  • a general method can be used. For example, a long nozzle is connected to the lower nozzle 33, the molten steel 4 poured out through this long nozzle is transferred to a tundish, and further poured from the tundish into a mold (mold), whereby casting is performed. Done.
  • the sliding nozzle device 3 is subjected to the control described in the above-described pouring step, blowing step, and re-pouring step. Then, by controlling the sliding nozzle device 3 by this control method to perform continuous casting, a slab having a predetermined cross-sectional shape according to the mold is manufactured.
  • the sliding nozzle device 3 is a two-layer type having two plates, the upper plate 31 and the sliding plate 32, but the present invention is not limited to this example.
  • the sliding nozzle device 3 may be of the three-layer type shown in FIGS. 5 and 6.
  • the sliding nozzle device 3 shown in FIGS. 5 and 6 has an upper plate 31, a sliding plate 32, a lower plate 34, and a lower nozzle 33.
  • the upper plate 31, the sliding plate 32, and the lower nozzle 33 are the same as those in the above embodiment.
  • the lower plate 34 is a refractory plate, and has a circular third nozzle hole 341 that is vertically opened in the plate surface.
  • the lower plate 34 is provided on the lower surface of the sliding plate 32 so as to be fixed to the upper plate 31 so that the first nozzle hole 311 and the third nozzle hole 341 are concentric with each other when viewed from above and below. It is provided so as to overlap. That is, in the sliding nozzle device 3 shown in FIGS. 5 and 6, the sliding plate 32 is provided so as to be sandwiched between the upper plate 31 and the lower plate 34, and slides between the upper plate 31 and the lower plate 34. ..
  • the lower nozzle 33 is the lower surface of the lower plate 34, and is fixedly provided at a position where the circular hole of the lower nozzle 33 and the third nozzle hole 341 are concentrically overlapped with each other when viewed from above and below. Further, as shown in FIG.
  • the sliding nozzle device 3 is in a closed state when the gas blowing hole 322 is arranged between the first nozzle hole 311 and the third nozzle hole 341.
  • the state in which the second nozzle holes 321 are arranged between the first nozzle holes 311 and the third nozzle holes 341 is the state in which the sliding nozzle device 3 is in the open state.
  • the sliding nozzle device 3 is not limited to the above-described modified example, and is not particularly limited as long as it is the sliding nozzle device 3 provided in the ladle 1 and is capable of gas bubbling in the closed state.
  • the slab production facility may be an ingot casting facility for casting an ingot instead of the continuous casting facility.
  • the re-pouring operation is not the pouring for the purpose of discharging the plugged sand 6 in the pouring process, but the pouring of the molten steel 4 for the purpose of normal casting. It may be served.
  • molten steel 4 may be transferred to a plurality of injection pipes, and therefore a re-pouring operation may be performed when changing the injection pipe to which molten steel 4 is transferred. ..
  • casting may be temporarily interrupted due to equipment troubles, and in this case re-pouring operation may be performed.
  • re-pouring operation may be performed similarly to the above-described embodiment, by performing the blowing step when re-pouring, it is possible to suppress the occurrence of non-open holes in the re-pouring step.
  • the steel type of the molten steel 4 is not limited to the high cleanliness steel, and is suitably used in the molten steel 4 of any steel type. be able to.
  • (1) and equation (2) was used time calculated from the equation, the present invention is not limited to such an example.
  • Uniformly mixing time t m is the time required for the component concentration of the molten steel 4 is asymptotic to within a certain range around the final value, it may be those generally defined in refining art. Therefore, (1) and (2) time calculated from the calculation formula other than the formula, may be used as a uniform mixing time t m.
  • a uniform mixing time calculation equation for a model closer to the actual shape of the ladle 1 may be used.
  • the gas blown in the blowing step was Ar gas, but the present invention is not limited to this example.
  • the gas blown in the blowing step may be an inert gas, and a gas other than Ar gas may be used.
  • the molten steel 4 is poured from the ladle 1 containing the molten steel 4 through the sliding nozzle device 3 provided in the ladle 1.
  • a method for controlling the sliding nozzle device 3 wherein the sliding nozzle device 3 is provided on the lower surface of the upper nozzle 2 fixed to the bottom of the ladle 1 and has an upper plate 31 having a first nozzle hole 311 and an upper plate 31.
  • a slide plate 32 having a second nozzle hole 321 provided on the lower surface of the second plate, and the slide plate 32 has an opening position where at least a part of the second nozzle hole 321 overlaps with the first nozzle hole 311.
  • the second nozzle hole 321 does not overlap the first nozzle hole 311, and can be moved by sliding the lower surface of the upper plate 31 up to the closed position where the first nozzle hole 311 is closed by the sliding plate 32.
  • the sliding plate 32 is further provided with a gas blowing hole 322 for blowing an inert gas into the first nozzle hole 311 and the molten steel 4 is accommodated in the ladle 1.
  • the pouring step of pouring a part of the molten steel 4 from the ladle 1 through the first nozzle hole 311 and the second nozzle hole 321, and after the pouring step, the sliding plate 32 is moved to the closed position.
  • the blowing time which is the time for blowing the inert gas
  • the temperature of the molten steel 4 in the ladle 1 can be made uniform by stirring the inert gas, and the solidification of the molten steel 4 in the sliding nozzle device 3 can be suppressed. ..
  • the blowing time is a uniform mixing time t m obtained from the equation (2) using the stirring power ⁇ (W/T) of the equation (1). It is 1/4 or more of (s).
  • the uniform mixing time can be calculated with a simple and highly accurate calculation model, and the blowing time can be calculated with a simple calculation method.
  • the pouring time which is the time for pouring a part of the molten steel 2 from the ladle 2 is 5 seconds or more and 13 seconds or less.
  • the sensible heat of the molten steel 4 that is poured out provides the amount of molten steel 4 that is needed to warm the sliding nozzle device 3 and solidifies the molten steel 4 in the sliding nozzle device 3. Can be suppressed. As a result, the occurrence of non-open holes can be further suppressed during re-pouring of the molten steel 4 in the ladle 1 (re-pouring process) without significantly lowering the molten steel yield.
  • the molten steel 4 is poured out from the ladle 1 containing the molten steel 4 through the sliding nozzle device 3 provided in the ladle 1.
  • a method for controlling the sliding nozzle device 3 according to any one of (1) to (4) above is used to cast the molten steel 4 poured in a re-pouring step.
  • the same effects as those of the configurations of (1) to (4) above can be obtained.
  • the quality of the cast product and the casting yield can be improved.
  • Example 1 performed by the present inventors will be described.
  • casting was performed using the method for producing a slab according to the above-described embodiment, and the reopening hole success rate, which is the success rate of opening in the re-pouring process, was investigated.
  • the investigation was conducted using a ladle 1 having a filling amount of the molten steel 4 of 190 t and a nozzle diameter of the upper nozzle 2 of 70 mm (nozzle cross-sectional area 3.8 ⁇ 10 ⁇ 3 m 2 ).
  • Example 1 in the pouring process, the sliding plate 32 was placed in the open position for 7 seconds, and the filling sand and the molten steel were poured out. Then, the sliding plate 32 was returned to the closed position, and Ar gas was blown into the molten steel 4 in the ladle 1 from the gas blowing hole 322 through the first nozzle hole 311. The flow rate of Ar gas was 30.0 NL/min (7.8 Nm 3 /(min ⁇ m 2 )). On the other hand, as a comparison, in the pouring process, after the sliding plate 32 is opened for 3 seconds to pour the sand and molten steel, the sliding plate 32 is returned to the closed position, and the first nozzle hole 311 is used.
  • the sliding plate 32 is left in the open position for 14 seconds to pour out the clogging sand and the molten steel, then the sliding plate 32 is returned to the closed position, and gas is blown through the first nozzle hole 311.
  • Ar gas of 30.0 NL/min was blown into the molten steel 4 in the ladle 1 through the hole 322 (Comparative Example 1-3).
  • Example 2 prior to the investigation, the uniform mixing time under the conditions of the actual machine was calculated.
  • the temperature T 1 of the molten steel 4 was 1827 (K)
  • the weight W of the molten steel 4 was 190 t
  • the blowing depth (bath depth) h v was 2.29 m
  • the atmospheric pressure P a was 0.1 MPa.
  • the standard temperature T 0 was 300 K
  • the bath diameter d v was 3.375 m.
  • the calculation result is shown in FIG. As shown in FIG. 7, it was confirmed that 1/4 of the uniform mixing time was 61.0 s when the Ar gas blowing flow rate of 30.0 NL/min, which is the condition of the actual machine.
  • Example 2 From the above results, continuous casting of molten steel was performed with 1/4 of the uniform mixing time set to 61.0 s, and the reopening hole success rate was investigated.
  • continuous casting of molten steel 4 was performed under the same conditions as those for calculating 1/4 of the uniform mixing time, and Ar gas was blown at a blowing flow rate of 30.0 NL/min in the blowing process. went.
  • continuous casting was performed under the condition of less than 61.0 s, which is less than 1 ⁇ 4 of the uniform mixing time, and the success rate of reopening hole was investigated (Comparative Example 2).
  • FIG. 8 shows the results of the reopening hole success rate in Example 2 and Comparative Example 2.
  • the re-opening hole ratio was 75.0% (12 successful opening operations/16 casting operations), which was low.
  • the re-opening hole ratio was 93.8% (30 successful opening operations/32 casting operations), and the re-opening hole rate was significantly improved. I was able to confirm that

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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

L'invention concerne un procédé de commande d'un dispositif de buse coulissante et un procédé de fabrication d'une dalle, avec lesquels il est possible de supprimer l'apparition d'un trou de non-ouverture lorsque de l'acier fondu dans une poche de coulée doit être versé de nouveau. Le procédé comprend une étape de soufflage de gaz dans laquelle, dans un état dans lequel de l'acier fondu (4) est reçu dans une poche de coulée (1), une plaque coulissante (32) est réglée à une position ouverte et une partie de l'acier fondu (4) est versée hors de la poche de coulée (1) à travers un premier trou de buse (311) et un second trou de buse (321), après quoi la plaque coulissante (32) est déplacée vers une position fermée et un gaz inerte est soufflé à partir d'un trou de soufflage de gaz (322) dans l'acier fondu (4) dans la poche de coulée (1) à travers le premier trou de buse (311) et, après l'étape de soufflage de gaz, une étape de nouveau versage dans laquelle la plaque coulissante (32) est réglée à la position ouverte et de l'acier fondu (4) est versé à partir de la poche de coulée (1) à travers le premier trou de buse (311) et le second trou de buse (321), la quantité de gaz inerte soufflé dans l'étape de soufflage de gaz étant au moins égale à 3,9 Nm3/(min∙m2) et au plus égale à 26,0 Nm3/(min∙m2).
PCT/JP2020/001590 2019-01-30 2020-01-17 Procédé de commande de dispositif de buse coulissante et procédé de fabrication de dalle WO2020158465A1 (fr)

Priority Applications (2)

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CN202080011512.1A CN113365759B (zh) 2019-01-30 2020-01-17 滑动水口装置的控制方法及铸片的制造方法
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