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A Method for Solving Cracks of High Carbon Crack Sensitive Steel Slabs

A technology that is sensitive to cracks and steel types, applied in the field of converter steelmaking, can solve the problems of waste products, achieve the effect of improving the pass rate and reducing the surface defects of the billet

Active Publication Date: 2021-11-02
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem to be solved: This application mainly proposes a method to solve the cracks of high-carbon crack-sensitive steel slabs, and solves the technical problems existing in the prior art such as the use of strong cooling to easily produce waste products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for solving high-carbon crack-sensitive steel slab cracks, comprising the steps of:

[0022] Step 1: Divide the cooling section into four parts, which are Zone 1, Zone 2, Zone 3 and Zone 4;

[0023] Step 2: Reduce the specific water volume of the secondary cooling water from the initial 1.4 liters / kg to 1.3 liters / kg. It is found that the waste and defective products caused by transverse cracks have decreased but the carbon segregation has not increased. The reduction is 7.1%, which is based on the empirical formula get conclusion;

[0024] Step 3: Adjust the proportion of cooling water in each zone at a specific water volume of 1.3 liters / kg. It is found that the proportions of the first to fourth zones are 34.98%, 42.36%, 12.32% and 10.34%, and the proportion of waste and defective products is the lowest, at 32.11% and 46.79%. , 11.47%, and 9.63% correspond to the highest proportion of waste and defective products. The judgment of waste and defective product...

Embodiment 2

[0032] A method for solving high-carbon crack-sensitive steel slab cracks, comprising the steps of:

[0033] Step 1: Divide the cooling section into four parts, which are Zone 1, Zone 2, Zone 3 and Zone 4;

[0034] Step 2: Reduce the specific water volume of the secondary cooling water from the initial 1.4 liters / kg to 1.3 liters / kg. It is found that the waste and defective products caused by transverse cracks have decreased but the carbon segregation has not increased. The reduction is 7.1%, which is based on the empirical formula get conclusion;

[0035] Step 3: Adjust the proportion of cooling water in each zone at a specific water volume of 1.3 liters / kg. It is found that the proportions of the first to fourth zones are 34.98%, 42.36%, 12.32% and 10.34%, and the proportion of waste and defective products is the lowest, at 32.11% and 46.79%. , 11.47%, and 9.63% correspond to the highest proportion of waste and defective products. The judgment of waste and defective product...

Embodiment 3

[0044] A method for solving high-carbon crack-sensitive steel slab cracks, comprising the steps of:

[0045] Step 1: Divide the cooling section into four parts, which are Zone 1, Zone 2, Zone 3 and Zone 4;

[0046] Step 2: Reduce the specific water volume of the secondary cooling water from the initial 1.4 liters / kg to 1.3 liters / kg. It is found that the waste and defective products caused by transverse cracks have decreased but the carbon segregation has not increased. The reduction is 7.1%, which is based on the empirical formula get conclusion;

[0047] Step 3: Adjust the proportion of cooling water in each zone at a specific water volume of 1.3 liters / kg. It is found that the proportions of the first to fourth zones are 34.98%, 42.36%, 12.32% and 10.34%, and the proportion of waste and defective products is the lowest, at 32.11% and 46.79%. , 11.47%, and 9.63% correspond to the highest proportion of waste and defective products. The judgment of waste and defective product...

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Abstract

This application discloses a method for solving the cracks of high-carbon crack-sensitive steel slabs. The secondary cooling section of the casting machine is divided into four parts, which are the first zone, the second zone, the third zone and the fourth zone; the specific water volume of the secondary cooling water It was lowered from the initial 1.4 liters / kg to 1.3 liters / kg, and it was found that the waste and defective products caused by transverse cracks decreased while the carbon segregation did not increase; the specific water volume was lowered by 7.1%, which was concluded based on experience. Under the specific water volume of 1.3 liters / kg, the proportion of cooling water in each zone was adjusted, and it was found that the proportion of waste and defective products was the lowest when the proportions of zones 1 to 4 were 34.98%, 42.36%, 12.32%, and 10.34%, and the proportion of water in zone 2 was 33.64% and 43.78%. , 12.44%, and 10.14%, the proportion of waste and defective products is relatively high, and the judgment of waste and defective products is based on the level of surface quality defects of the wire rod, including defects such as scars, zigzags, and shrinkage cavities, of which 32.11%, 46.79%, 11.47%, 9.63% corresponds to the highest proportion of waste and defective products, and the lowest waste and defective products are determined when the specific water volume is 1.3 liters / kg and the ratio of the second zone and the second cold water is 34.98%, 42.36%, 12.32%, and 10.34%.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a method for solving the cracks of high-carbon crack-sensitive steel billets. Background technique [0002] In the production process of billet high-carbon steel, in order to control carbon segregation, strong cooling is generally used; but for high-carbon steel with high alloy content such as 65Mn or steel types SWRH72BCr and SWRH82BCr with trace strengthening elements V added, Still according to the water distribution model of carbon steel with the same carbon content, waste products due to transverse cracks in the slab appear, so it is necessary to find a way to solve it and improve the product qualification rate. Contents of the invention [0003] The technical problem to be solved: This application mainly proposes a method for solving the cracks of high-carbon crack-sensitive steel slabs, and solves the technical problems existing in the prior art...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/124B22D11/22
CPCB22D11/124B22D11/225
Inventor 黄永林李解倪汉平张鲲陈志远
Owner ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD
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