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Control method for air cooling bainite steel bloom bending

A technology of bainite steel and control method, which is applied in the field of metallurgy, can solve problems such as the application of bloom billet, cumbersome actual operation, and quantitative research on bending degree that have not been mentioned, so as to save equipment investment and maintenance costs, and reduce production costs , the effect of reducing the degree of bending

Active Publication Date: 2017-12-15
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] Heat Tail No. 2344

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

[0019] (1) Casting billet conveying process: The casting billet is cut to a fixed length and then passes through the conveying roller table, and the surface temperature before the cooling bed is 691 °C;

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

[0021] (3) Slow cooling process of casting billet: The casting billet is stored in the slow cooling pit after being released from the cooling bed, and the slow cooling is carried out by means of dense stacking.

[0022] Inspect the air-cooled bainitic steel blooms with a curvature of 0-3mm per meter. The air-...

Embodiment 2

[0024] Heat Tail No. 2871

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

[0026] (1) Casting billet conveying process: The casting billet is cut to a fixed length and then passes through the conveying roller table, and the surface temperature before the cooling bed is 612 °C;

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

[0028] (3) Slow cooling process of casting billet: After the casting billet is released from the cooling bed, it is stored in the slow cooling pit, and the slow cooling is carried out by means of dense stacking.

[0029] Inspect the air-cooled bainitic steel blooms with a curvature of 0-3mm per meter. ...

Embodiment 3

[0031] Heat Tail No. 3606

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

[0033] (1) Casting billet conveying process: The casting billet is cut to a fixed length and then passes through the conveying roller table, and the surface temperature before the cooling bed is 655 °C;

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

[0035] (3) Slow cooling process of casting billet: The casting billet is stored in the slow cooling pit after being released from the cooling bed, and the slow cooling is carried out by means of dense stacking.

[0036] Check that the air-cooled bainitic steel bloom is 0-2mm per meter. The air-cooled bainitic steel bloom is effect...

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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 air-cooled bainitic steel blooms. Background technique [0002] Air-cooled bainitic steel blooms are used for rolling bainitic rails, with relatively high content of alloying elements such as silicon, chromium, molybdenum, and nickel, and are typical high-carbon and high-alloy steel grades. During the production process, the casting billet goes off the assembly line and during the cooling process, the quality defect of the billet bending exceeding the standard is easy to occur. If the casting billet exceeds the standard seriously, the steel cannot be pushed into the heating furnace normally and can only be scrapped, resulting in serious quality loss and cost increase. . [0003] Excessive billet bending is a relatively common quality defect, so there have been some related researches on billet bending control, such as the ut...

Claims

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Application Information

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Patent Type & Authority Applications(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
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