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A Bending Control Method of Air-cooled Bainitic Steel Bloom

A technology of bainite steel and control method, which is applied in the field of metallurgy, can solve problems such as application of bloom billets, quantitative research on bending degree, cumbersome actual operation, etc., so as to save equipment investment and maintenance costs, and reduce production costs , the effect of reducing the degree of bending

Active Publication Date: 2019-04-23
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The document "Study on Reducing Bending of Alloy Cold Heading Billet" only studies the bending problem of billet SCM435 alloy cold heading steel with billet, and does not mention whether this method is applicable to bloom billet
In addition, the control method involves the control of molten steel purity, slab segregation control, continuous casting equipment working condition adjustment, slab conveying, and turning cooling bed billet discharge mode, etc. The actual operation is too cumbersome and no quantitative research has been done on the curvature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Stove number 2344

[0018] The bending control method of the air-cooled bainite steel bloom (specification: section 280mm*380mm, fixed length 5.0m) in this embodiment includes the process of casting slab transportation, casting slab off-line, and casting slab slow cooling, and the specific process steps are as follows:

[0019] (1) Slab conveying process: the slab is cut to length and passes through the conveying roller table, and the surface temperature in front of the upper cooling bed is 691°C;

[0020] (2) Slab off-line process: the slab is continuously pushed on the cooling bed, and the surface temperature of the slab is 437°C;

[0021] (3) Slab slow cooling process: The slab is stored in the slow cooling pit after it comes down from the cooling bed, and is slowly cooled by close-packed stacking, and the slow cooling pit is covered and kept for 48 hours.

[0022] The curvature of the air-cooled bainitic steel bloom is 0-3mm per meter, and the curvature of the air-...

Embodiment 2

[0024] Furnace end number 2871

[0025] The bending control method of the air-cooled bainitic steel bloom (specification: cross-section 280mm*380mm, fixed length 8.0m) of this embodiment includes casting slab transportation, casting slab off-line, and casting slab slow cooling process, and the specific process steps are as follows:

[0026] (1) Slab conveying process: the slab is cut to length and passed through the conveying roller table, and the surface temperature before the upper cooling bed is 612°C;

[0027] (2) Slab off-line process: the slab is continuously pushed on the cooling bed, and the surface temperature of the slab is 403°C;

[0028] (3) Slab slow cooling process: The slab is stored in the slow cooling pit after it comes down from the cooling bed, and is slowly cooled by close-packed stacking, and the slow cooling pit is covered and kept for 28 hours.

[0029] The curvature of the air-cooled bainitic steel bloom is 0-3mm per meter, and the curvature of the air...

Embodiment 3

[0031] Heat number 3606

[0032] The bending control method of the air-cooled bainitic steel bloom (specification: cross-section 280mm*380mm, fixed length 6.2m) in this embodiment includes casting slab transportation, casting slab off-line, and casting slab slow cooling process, and the specific process steps are as follows:

[0033] (1) Slab conveying process: the slab is cut to length and passes through the conveying roller table, and the surface temperature in front of the upper cooling bed is 655°C;

[0034] (2) Slab off-line process: the slab is continuously pushed on the cooling bed, and the surface temperature of the slab is 427°C;

[0035] (3) Slab slow cooling process: the slab is stored in the slow cooling pit after it comes down from the cooling bed, and is slowly cooled by close-packed stacking, and the slow cooling pit is covered and kept for 26 hours.

[0036] The curvature of the air-cooled bainitic steel bloom is 0-2mm per meter, and the curvature of the air-c...

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PUM

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Abstract

The invention discloses a control method for air cooling bainite steel bloom bending. The control method comprises the steps of casting bloom conveying, casting bloom discharging and casting bloom slow cooling, wherein the casting bloom slow cooling step adopts a close-packed stacking mode for slow cooling. According to the control method, under the condition that no device is additionally arranged, the purposes of reducing the cast bloom curvature, equipment investment, maintaining cost and production cost are achieved; the curvature of an air cooling bainite steel bloom is effectively controlled, the curvature of the casting bloom is not larger than 3 mm per meter, the process is simple and reliable, and the quality defect that the curvature of the casting bloom is prone to exceeding the standard in the casting bloom discharging and cooling processes during production is overcome.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling the bending of an air-cooled bainite steel bloom. Background technique [0002] Air-cooled bainitic steel blooms are used for rolling bainitic steel rails. They have relatively high content of silicon, chromium, molybdenum, nickel and other alloying elements, and are typical high-carbon and high-alloy steels. During the production process, the casting slab is offline and the cooling process is prone to quality defects such as the casting slab bending exceeding the standard. If the casting slab exceeds the standard, it will not be able to push the steel into the heating furnace normally and must be scrapped, resulting in serious quality loss and cost increase. . [0003] Exceeding the standard of billet bending is a relatively common quality defect, so there have been some related researches on the control of billet bending, such as the uti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/84C21D11/00B22D11/124B22D11/22
CPCB22D11/124B22D11/22C21D1/84C21D11/005
Inventor 韩健王建锋郭朝军张海旺崔恺汪鹏杨正宗韩志杰
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY