A method for reducing flow and increasing production of a multi-strand continuous casting machine

Abstract

The present application belongs to the technical field of continuous casting machine production, and specifically discloses a method for reducing flow and increasing production of a multi-billet continuous casting machine, which comprises adjusting the amount of molten steel generated in a converter: reducing the amount of molten steel tapped from the converter from 165 t to 140 t, and shortening the pouring cycle from 83 min to 73 min; formulating flow blocking according to the pouring condition of a tundish: dividing the flow channel of the continuous casting machine into pouring forms of "2-flow rectangular billets + 4-flow square billets" and "2-flow rectangular billets + 3-flow square billets"; controlling the billet drawing speed: setting different pouring stages, and adjusting the aperture size of the sliding blocks of rectangular billets and square billets according to the corresponding pouring stages, so as to control the billet drawing speed; and adjusting the pouring flow of a ladle: adjusting the amount of molten steel poured from the ladle into the tundish according to the billet drawing speed. By adjusting the amount of molten steel tapped, the pouring flow, the aperture of the sliding blocks, the flow number and the tonnage of square billets, the problem of square billet redundancy and resource waste caused by the original 8-machine 8-flow continuous casting machine is solved, and the tonnage of square billet production and the tonnage of rectangular billet production gradually balance in the total amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of continuous casting machine, and particularly relates to a method for reducing flow and increasing production of a multi-steel type continuous casting machine. BACKGROUND

[0002] A continuous casting machine is an industrial device used to continuously cast molten steel into a casting blank with a certain cross-sectional shape and size specification. The continuous casting machine pours liquid metal into a condensing device, and under the condition of partial condensation of the metal, a casting piece of a specific length and shape is pulled out from the other end of the condensing device. There are various types of continuous casting machines, including vertical continuous casting machines, vertical-bending continuous casting machines, etc. according to the structure and shape, slab continuous casting machines, billet continuous casting machines, etc. according to the cast section, and single-flow, double-flow or multi-flow continuous casting machines according to the number of casting blank flows. These different types of continuous casting machines meet different production needs, further expanding the application range and flexibility of the continuous casting machine.

[0003] The known 8-machine 8-flow continuous casting machine is a high-efficiency continuous casting device that can simultaneously process eight steel flows to produce multiple casting blanks. This type of continuous casting machine generally has high production efficiency and flexibility, and is suitable for large-scale steel production. The application scenarios of the 8-machine 8-flow continuous casting machine mainly include: replacing old equipment: replacing old continuous casting equipment in newly built steel plants to improve production efficiency and product quality; high-quality steel production: used for producing high-carbon steel, tire cord steel, bearing steel and spring steel, etc. The main features of the 8-machine 8-flow continuous casting machine include: multiple steel flow processing: capable of simultaneously processing eight steel flows to improve production efficiency; flexible production line: suitable for producing multiple specifications of casting blanks to meet different needs; efficient cooling system: ensures the quality of the casting blank through the secondary cooling zone; advanced control system: ensures that the production parameters of each steel flow are consistent to ensure product quality.

[0004] Although the 8-machine 8-flow continuous casting machine has the advantages of high efficiency, stability, flexibility and advancement, etc., in the case of full-flow operation of the continuous casting machine, there are two flow rectangular blanks + six flow square blanks, and the output of the rectangular blanks is small, while the output of the square blanks is redundant, which leads to the problem of overstock of square blank profiles, resulting in unnecessary resource consumption and cost waste. SUMMARY

[0005] The purpose of the present application is to provide a method for reducing flow and increasing production of a multi-steel type continuous casting machine to solve the problem of small output of rectangular blanks and redundant output of square blanks, resulting in resource consumption and cost waste in the case of full-flow operation of an 8-machine 8-flow continuous casting machine.

[0006] To achieve the above-mentioned purpose, the basic scheme provided by the present application is as follows: a method for reducing flow and increasing production of a multi-steel type continuous casting machine, including adjusting the amount of molten steel generated in a converter, formulating a flow blocking scheme according to the pouring condition of a tundish, controlling the casting speed of a steel blank, and adjusting the pouring flow of a ladle, the method being as follows:

[0007] Adjusting the amount of molten steel generated in the converter: reducing the amount of molten steel from the converter from 165t to 140t, shortening the pouring cycle from 83min to 73min;

[0008] According to the pouring condition of the tundish, the flow is blocked: the flow channel of the continuous casting machine is divided into "2 flow rectangular billet + 4 flow square billet" and "2 flow rectangular billet + 3 flow square billet" pouring form;

[0009] Control the speed of the billet: set different pouring stages, and adjust the aperture size of the rectangular billet and the square billet according to the corresponding pouring stage, so as to control the speed of the billet;

[0010] Adjust the pouring flow of the ladle: according to the speed of the billet, adjust the amount of molten steel poured into the tundish from the ladle.

[0011] The working principle of the present application is that: first, reducing the amount of molten steel from the converter from 165t to 140t, thereby reducing the pouring cycle and reducing the temperature drop, adjusting the flow from the previous "2+6" operation to "2+4" and "2+3" operation, setting the aperture of the slide block to 19mm, 16mm, 14.5mm three kinds, respectively matching different billet type and different pouring period, in order to reduce the waste of resources caused by square billet redundancy, finally adjusting the pouring operation rhythm, balancing the production of square billet and rectangular billet.

[0012] The beneficial effects of the present application are that: by adjusting the amount of molten steel, the pouring flow, the aperture of the slide block, the number of flows and the tonnage of the square billet, the problem of square billet redundancy and resource waste caused by the simultaneous casting of 2 flow rectangular billet and 6 flow square billet in the previous "2+6" operation is solved, and according to this method, the tonnage of square billet production and the tonnage of rectangular billet production gradually balance in the total proportion.

[0013] Scheme two, which is the preferred embodiment of the basic scheme, the specific blocking flow mode is as follows:

[0014] When performing 2 flow rectangular billet + 4 flow square billet pouring operation, use the blocking cone to block the upper water inlet of 4, 5 flow channel, the rectangular billet passes through 1, 2 flow channel for operation, and the square billet passes through 3, 6, 7, 8 flow channel for operation;

[0015] When performing 2 flow rectangular billet + 3 flow square billet pouring operation, use the blocking cone to block the upper water inlet of 3, 4, 5 flow channel, the rectangular billet passes through 1, 2 flow channel for operation, and the square billet passes through 6, 7, 8 flow channel for operation.

[0016] Use the specially set blocking cone to block the upper water inlet that needs to be blocked by artificial way, so as to control the production flow number and tonnage of the square billet.

[0017] Scheme three, this is the preferred basic scheme, the method of controlling the billet speed is, the pouring is divided into the first 3 furnace steel, the 4-6 furnace steel and the 7 furnace steel and after three stages, different flow and different aperture slider are set according to different stages, the specific setting method is as follows:

[0018] When pouring the first 3 furnace steel, 2 flow rectangular billet and 4 flow square billet pouring operation are carried out, the rectangular billet is set with 19mm aperture slider, at this time the average speed of rectangular billet is controlled at 1.7m / min; The square billet flow channel is set with 16mm aperture slider for operation, at this time the average speed of square billet is controlled at 2.15m / min;

[0019] When pouring the first 3 furnace steel, 2 flow rectangular billet and 4 flow square billet pouring operation are carried out, the rectangular billet is set with 19mm aperture slider, at this time the average speed of rectangular billet is controlled at 1.7m / min; The square billet flow channel is set with 16mm aperture slider for operation, at this time the average speed of square billet is controlled at 2.15m / min;

[0020] When pouring the first 3 furnace steel, 2 flow rectangular billet and 4 flow square billet pouring operation are carried out, the rectangular billet is set with 19mm aperture slider, at this time the average speed of rectangular billet is controlled at 1.7m / min; The square billet flow channel is set with 16mm aperture slider for operation, at this time the average speed of square billet is controlled at 2.15m / min.

[0021] The first stage reduces the flow of square billet by 2, forming a "2+4" operation flow; The second stage has the same flow as the first stage, but the aperture of the square billet slider is reduced, thereby slowing down the speed of the square billet; The third stage further reduces the flow of square billet by 1 based on the flow and aperture of the second stage, forming a "2+3" operation flow; The output of square billet is gradually and slowly reduced.

[0022] Scheme four, this is the preferred basic scheme, the method of adjusting the ladle pouring flow is, according to the aperture slider used at different times, the speed of the billet is controlled, according to the service life of the tundish, the average pouring amount, the pouring period and the production amount are calculated, the calculation method is as follows:

[0023] The pouring period of each furnace steel = 140t (ladle water amount) / per minute pouring water amount,

[0024] The per minute pouring water amount = per minute pouring rectangular billet + per minute pouring square billet,

[0025] The per minute pouring square billet amount = square billet average speed * square billet flow number * 0.17325,

[0026] The per minute pouring rectangular billet amount = rectangular billet average speed * rectangular billet flow number * 0.17325 * 165 * 225 / 150 / 150,

[0027] Billet production = amount of billet pouring per minute * pouring cycle,

[0028] Rectangular bloom production = ladle steel amount - billet production.

[0029] According to the pulling speed and pouring amount of each stage, 17 furnaces of steel can be poured within 20h, so the third stage is the 7-17 furnace steel stage, according to the different slide hole diameters, the corresponding flow has a corresponding pulling speed, according to the mutual cooperation of pouring amount, pulling speed and pouring cycle, the ideal production of rectangular bloom and billet is obtained.

[0030] Scheme five, which is a preferred scheme of scheme three or scheme four, the ladle standby time between each furnace of steel is controlled to be 5-10min. If the standby time is lower than 5min, it is not conducive to the stability of the continuous casting production rhythm, and serious accidents of continuous casting abnormal stop may occur; if the standby time is higher than 10min, the temperature drop of the molten steel in the ladle will increase, resulting in insufficient molten steel temperature during pouring

[0031] Scheme six, which is a preferred scheme of scheme five, the temperature measurement frequency during pouring is 1 time per 5min, when the molten steel temperature in the tundish is ≤1530℃, the pouring of the ladle is stopped and the high-temperature ladle is replaced, and the low-temperature ladle is returned to the smelting area for heating. DETAILED DESCRIPTION

[0032] The application will be further described in detail through specific embodiments:

[0033] Example one

[0034] A method for reducing flow and increasing production of a multi-billet type continuous casting machine, including adjusting the amount of molten steel generated in the converter, formulating a flow blocking scheme according to the tundish pouring condition, controlling the billet pulling speed, and adjusting the ladle pouring flow, the method is as follows:

[0035] Adjusting the amount of molten steel generated in the converter: reducing the molten steel amount from 165t to 140t when tapping the converter, shortening the pouring cycle from 83min to 73min;

[0036] Formulating a flow blocking scheme according to the tundish pouring condition: dividing the continuous casting machine flow channel into “2 flow rectangular bloom + 4 flow billet” and “2 flow rectangular bloom + 3 flow billet” pouring forms, and the flow blocking mode is as follows:

[0037] When performing 2 flow rectangular bloom + 4 flow billet pouring operation, the upper water inlet of 4, 5 flow channel is blocked by a blocking cone, the rectangular bloom is operated through 1, 2 flow channel, and the billet is operated through 3, 6, 7, 8 flow channel;

[0038] When the casting operation of 2 flow rectangular billets and 3 flow square billets is carried out, the upper water inlets of the 3rd, 4th and 5th flow channels are blocked by the blocking cone, the rectangular billets are cast through the 1st and 2nd flow channels, and the square billets are cast through the 6th, 7th and 8th flow channels.

[0039] The control of the billet casting speed is achieved by setting different casting stages and adjusting the aperture size of the sliding block of the rectangular billet and the square billet according to the corresponding casting stage, and the method for controlling the billet casting speed is as follows: the casting is divided into the first 3 heats, the 4th-6th heats and the 7th heat and later, different flow numbers and different aperture sizes of the sliding block are set according to different stages, and the specific setting mode is as follows:

[0040] When the first 3 heats are cast, the casting operation of 2 flow rectangular billets and 4 flow square billets is carried out, the aperture size of the sliding block of the rectangular billet is set to 19 mm, at this time the average casting speed of the rectangular billet is controlled to be 1.7 m / min, and the aperture size of the sliding block of the square billet is set to 16 mm, at this time the average casting speed of the square billet is controlled to be 2.15 m / min;

[0041] When the 4th-6th heats are cast, the casting operation of 2 flow rectangular billets and 4 flow square billets is carried out, the aperture size of the sliding block of the rectangular billet is set to 19 mm, at this time the average casting speed of the rectangular billet is controlled to be 1.7 m / min, and the aperture size of the sliding block of the square billet is set to 14.5 mm, at this time the average casting speed of the square billet is controlled to be 1.85 m / min;

[0042] When the 7th heat is cast, the casting operation of 2 flow rectangular billets and 3 flow square billets is carried out, the aperture size of the sliding block of the rectangular billet is set to 19 mm, at this time the average casting speed of the rectangular billet is controlled to be 1.7 m / min, and the aperture size of the sliding block of the square billet is set to 14.5 mm, at this time the average casting speed of the square billet is controlled to be 1.85 m / min.

[0043] The method for adjusting the ladle casting flow is as follows: the casting speed of the billet is controlled according to the aperture size of the sliding block used at different time periods, and the average casting amount, the casting cycle and the production amount are calculated according to the service life of the tundish, and the calculation method is as follows:

[0044] The casting cycle of each heat of steel = 140 t (the amount of molten steel in the ladle) / the amount of molten steel cast per minute,

[0045] The amount of molten steel cast per minute = the amount of rectangular billet cast per minute + the amount of square billet cast per minute,

[0046] The amount of square billet cast per minute = the average casting speed of the square billet * the flow number of the square billet * 0.17325,

[0047] The amount of rectangular billet cast per minute = the average casting speed of the rectangular billet * the flow number of the rectangular billet * 0.17325 * 165 * 225 / 150 / 150,

[0048] Billet production = amount of billets cast per minute * pouring cycle,

[0049] Rectangle billet production = ladle steel amount - billet production.

[0050] In the first 3 heats of steel: amount of billets cast per minute is 2.15*4*0.17325=1.49t, amount of rectangle billets cast per minute is 1.7*2*0.17325*165*225 / (150*150)=0.97t, amount of steel poured per minute is 1.49+0.97=2.46t, and pouring cycle of each heat of steel is 140 / 2.46=56.87min,

[0051] Thus, we have:

[0052] Billet production is 1.49*56.87=87.73t,

[0053] Rectangle billet production is 140-87.73=55.27t;

[0054] In the 4th-6th heats of steel: amount of billets cast per minute is 1.85*4*0.17325=1.28t, amount of rectangle billets cast per minute is 1.7*2*0.17325*165*225 / (150*150)=0.97t, amount of steel poured per minute is 1.28+0.97=2.25t, and pouring cycle of each heat of steel is 140 / 2.25=62.77min,

[0055] Thus, we have:

[0056] Billet production is 1.25*62.77=79.63t,

[0057] Rectangle billet production is 140-79.63=60.37t;

[0058] In the 7th heat of steel and later: amount of billets cast per minute is 1.85*3*0.17325=0.96t, amount of rectangle billets cast per minute is 1.7*2*0.17325*165*225 / (150*150)=0.97t, amount of steel poured per minute is 0.96+0.97=1.93t, and pouring cycle of each heat of steel is 140 / 1.93=72.41min,

[0059] Thus, we have:

[0060] Billet production is 0.96*72.41=69.62t,

[0061] Rectangle billet production is 140-69.62=70.37t.

[0062] Wherein 165*225 and 150*150 refer to the cross-sectional area of rectangular billet and square billet respectively, and 0.17325 is the weight per meter of 150*150 cross-section continuous casting billet.

[0063] The embodiment of the present application is:

[0064] When casting steel billets using a continuous casting machine, the amount of molten steel in the converter is adjusted to 140 t, and the casting operation is divided into "2+4" operation flow and "2+3" operation flow:

[0065] 2+4 operation, which means that there are 8 flow channels in total, 2 of which produce rectangular billets, 4 of which produce square billets, and the steel flow upper nozzle of flow channels 4 and 5 is blocked by a plug, and only through flow channels 1, 2, 3, 6, 7, and 8 to carry out the operation of 2 rectangular billets and 4 square billets; 2+3 operation, which means that there are 8 flow channels in total, 2 of which produce rectangular billets, 3 of which produce square billets, and the steel flow upper nozzle of flow channels 3, 4, and 5 is blocked by a plug, and only through flow channels 1, 2, 6, 7, and 8 to carry out the operation of 2 rectangular billets and 3 square billets; and then the casting stage is divided into the first 3 heats of steel, the 4th-6th heats of steel, and the 7th heat of steel and later three stages:

[0066] When casting the first 3 heats of steel, the casting operation of 2 rectangular billets and 4 square billets is carried out, the rectangular billet is set with a 19mm aperture slide block, at this time the average pulling speed of the rectangular billet is controlled at 1.7m / min; the square billet flow channel is set with a 16mm aperture slide block for operation, at this time the average pulling speed of the square billet is controlled at 2.15m / min;

[0067] When casting the 4th-6th heats of steel, the casting operation of 2 rectangular billets and 4 square billets is carried out, the rectangular billet is set with a 19mm aperture slide block, at this time the average pulling speed of the rectangular billet is controlled at 1.7m / min; the square billet flow channel is set with a 14.5mm aperture slide block for operation, at this time the average pulling speed of the square billet is controlled at 1.85m / min;

[0068] When casting the 7th heat of steel, the casting operation of 2 rectangular billets and 3 square billets is carried out, the rectangular billet is set with a 19mm aperture slide block, at this time the average pulling speed of the rectangular billet is controlled at 1.7m / min; the square billet flow channel is set with a 14.5mm aperture slide block for operation, at this time the average pulling speed of the square billet is controlled at 1.85m / min.

[0069] Finally, through the calculation of the corresponding pulling speed, flow number and casting cycle of each stage, the yield and proportion of the steel billet are obtained as:

[0070] The first stage: the rectangular billet production tonnage is 55.27t, the square billet production tonnage is 84.73t, and the rectangular billet yield proportion is 55.27 / 140=39.48%;

[0071] Second stage: rectangular blank production tonnage is 60.37t, square blank production tonnage is 79.63t, rectangular blank yield ratio is 60.37 / 140=43.12%;

[0072] Third stage: rectangular blank production tonnage is 70.38t, square blank production tonnage is 69.62t, rectangular blank yield ratio is 70.37 / 140=50.27%.

[0073] Example two

[0074] The continuous casting machine flow is divided into "2 flow rectangular blank + 4 flow square blank" pouring form, the upper nozzle of 4, 5 flow is blocked by blocking cone, rectangular blank is operated through 1, 2 flow, square blank is operated through 3, 6, 7, 8 flow, the rectangular blank is set with 19mm aperture slide block, and the square blank flow is set with 16mm aperture slide block for operation. DETAILED DESCRIPTION:

[0076] The square blank is poured every minute: 2.15*4*0.17325=1.49t, the rectangular blank is poured every minute: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the molten steel pouring amount per minute is: 1.49+0.97=2.46t, the pouring period of each furnace steel is: 140 / 2.46=56.87min,

[0077] Therefore:

[0078] The square blank production is: 1.49*56.87=87.73t,

[0079] The rectangular blank production is: 140-87.73=55.27t;

[0080] At this time, the rectangular blank yield ratio is: 39.48%.

[0081] Example three

[0082] The continuous casting machine flow is divided into "2 flow rectangular blank + 4 flow square blank" and "2 flow rectangular blank + 4 flow square blank" pouring form, the upper nozzle of 4, 5 flow is blocked by blocking cone, rectangular blank is operated through 1, 2 flow, square blank is operated through 3, 6, 7, 8 flow,

[0083] When pouring the first 3 furnaces of steel, 2 flow rectangular blank and 4 flow square blank pouring operation is implemented, the rectangular blank is set with 19mm aperture slide block, the average drawing speed of rectangular blank is controlled at 1.7m / min, the square blank flow is set with 16mm aperture slide block for operation, and the average drawing speed of square blank is controlled at 1.85m / min;

[0084] When pouring the 4th furnace steel, the pouring operation of 2 flow rectangular billets and 4 flow square billets was implemented, the slide block with a 19mm aperture was arranged for the rectangular billet, and the average drawing speed of the rectangular billet was controlled at 1.7m / min; the slide block with a 14.5mm aperture was arranged for the square billet flow channel to implement the operation, and the average drawing speed of the square billet was controlled at 1.85m / min. DETAILED DESCRIPTION

[0086] The first 3 furnace steels: the square billet poured per minute is: 2.15*4*0.17325=1.49t, the rectangular billet poured per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the molten steel poured per minute is: 1.49+0.97=2.46t, and the pouring period of each furnace steel is: 140 / 2.46=56.87min,

[0087] Therefore, it can be obtained that:

[0088] The square billet production is: 1.49*56.87=87.73t,

[0089] The rectangular billet production is: 140-87.73=55.27t;

[0090] At this time, the proportion of the rectangular billet production is: 39.48%.

[0091] The 4th furnace steel: the square billet poured per minute is: 1.85*4*0.17325=1.28t, the rectangular billet poured per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the molten steel poured per minute is: 1.28+0.97=2.25t, and the pouring period of each furnace steel is: 140 / 2.25=62.11min,

[0092] Therefore, it can be obtained that:

[0093] The square billet production is: 1.25*62.11=79.63t,

[0094] The rectangular billet production is: 140-79.63=60.37t;

[0095] At this time, the proportion of the rectangular billet production is: 43.12%.

[0096] Table 1. Comparison table of yield change of square billet and rectangular billet

[0097]

[0098] Therefore, it can be obtained that:

[0099] The square billet produced by one pouring of the method of the comparative example 1 is 84.73t, the rectangular billet is 55.27t, and the proportion of the rectangular billet is 39.48%;

[0100] The square billet produced by one pouring of the method of the comparative example 2 is 84.73t, the rectangular billet is 55.27t, and the proportion of the rectangular billet is 39.48%; the square billet produced by one pouring of the 4th steel and the following steels is 79.63t, the rectangular billet is 60.37t, and the proportion of the rectangular billet is 43.12%,

[0101] The square billet produced by one pouring of the method of the comparative example 2 is 84.73t, the rectangular billet is 55.27t, and the proportion of the rectangular billet is 39.48%; the square billet produced by one pouring of the 4th steel and the following steels is 79.63t, the rectangular billet is 60.37t, and the proportion of the rectangular billet is 43.12%,

[0102] The above-mentioned is only the embodiment of the present application, and the well-known specific structure and characteristics in the scheme are not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A method for reducing flow and increasing production in a multi-bill continuous casting machine, characterized in that, This includes adjusting the amount of molten steel produced in the converter, developing a flow blocking plan based on the tundish pouring situation, controlling the billet casting speed, and adjusting the ladle pouring flow rate. The methods are as follows: Adjust the amount of molten steel generated in the converter: reduce the amount of molten steel tapped from the converter from 165t to 140t, thereby shortening the casting cycle from 83min to 73min; The flow blocking method is formulated based on the tundish pouring situation: the continuous casting machine runner is divided into pouring patterns of "2 rectangular slabs + 4 square slabs" and "2 rectangular slabs + 3 square slabs". The specific flow blocking method is as follows: 1) When casting 2 rectangular billets and 4 square billets, use a plugging cone to block the inlet of the 4th and 5th flow channels. The rectangular billets are cast through the 1st and 2nd flow channels, and the square billets are cast through the 3rd, 6th, 7th and 8th flow channels. 2) When casting 2 rectangular billets and 3 square billets, use a plugging cone to block the inlet of channels 3, 4 and 5. The rectangular billets are cast through channels 1 and 2, and the square billets are cast through channels 6, 7 and 8. Controlling billet casting speed: Different casting stages are set, and the slider hole diameter of rectangular and square billets is adjusted according to the corresponding casting stage to control the billet casting speed. The specific control method is as follows: 1) The casting process is divided into three stages: the first 3 heats, the 4th-6th heats, and the 7th heat and beyond. Different flow rates and different orifice diameter sliders are set according to different stages. The specific settings are as follows: 2) When casting the first 3 heats of steel, the casting operation is carried out with 2 stream rectangular billets and 4 stream square billets. The rectangular billets are equipped with a slider with a 19mm diameter hole, and the average casting speed of the rectangular billets is controlled at 1.7m / min. The square billet runner is equipped with a slider with a 16mm diameter hole, and the average casting speed of the square billets is controlled at 2.15m / min. 3) When casting steel for the 4th to 6th heats, the casting operation is carried out with 2 stream rectangular billets and 4 stream square billets. The rectangular billets are equipped with a 19mm diameter slide block, and the average casting speed of the rectangular billets is controlled at 1.7m / min. The square billet runner is equipped with a 14.5mm diameter slide block, and the average casting speed of the square billets is controlled at 1.85m / min. 4) When the casting of the 7th heat of steel begins, the casting operation is carried out with 2 stream rectangular billets and 3 stream square billets. The rectangular billets are equipped with a 19mm diameter slide block, and the average casting speed of the rectangular billets is controlled at 1.7m / min. The square billet runner is equipped with a 14.5mm diameter slide block, and the average casting speed of the square billets is controlled at 1.85m / min. Adjust the ladle pouring flow rate: Adjust the amount of molten steel poured from the ladle into the tundish according to the billet casting speed.

2. The method for reducing flow and increasing production in a multi-slab continuous casting machine according to claim 1, characterized in that, The method for adjusting the ladle pouring flow rate is as follows: Based on the orifice slider used at different times, control the billet casting speed; and calculate the average pouring volume, pouring cycle, and production volume based on the tundish's service life and the ladle's molten steel volume. The calculation method is as follows: The pouring cycle for each heat of steel is calculated as 140t / the amount of molten steel poured per minute, where 140t represents the volume of molten steel in the ladle. Steel pouring rate per minute = Rectangular billet pouring rate per minute + Square billet pouring rate per minute Billet pouring rate per minute = Average billet casting speed * Number of billet flows * 0.17325 The amount of rectangular billet poured per minute = average casting speed of rectangular billet * number of rectangular billet flows * 0.17325 * 165 * 225 / (150 * 150). Where 165*225 and 150*150 refer to the cross-sectional areas of the rectangular billet and the square billet, respectively, and 0.17325 is the weight per meter of the 150*150 cross-section continuously cast billet. Billet production rate = Billet quantity poured per minute * Pouring cycle Rectangular billet production volume = molten steel volume in ladle - square billet production volume.

3. A method for reducing flow and increasing production in a multi-slab continuous casting machine according to claim 1 or 2, characterized in that, The ladle preparation time between each heat of steel should be controlled at 5-10 minutes.

4. The method for reducing flow and increasing production in a multi-slab continuous casting machine according to claim 3, characterized in that, Temperature is measured every 5 minutes during the casting process. When the temperature of the molten steel in the tundish is ≤1530℃, the casting is stopped and the high-temperature ladle is replaced. The low-temperature ladle is returned to the smelting area for heating.

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