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Method for solving high-carbon crack sensitive steel billet crack

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: 2020-04-10
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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PUM

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Abstract

The invention discloses a method for solving a high-carbon crack sensitive steel billet crack. The secondary cooling section of a casting machine is divided into four parts respectively including an area I, an area II, an area III and an area IV; when the specific water flow of secondary cooling water is reduced to 1.3 liter per kilogram from 1.4 liter per kilogram at first, waste and defective products caused by transverse cracks are reduced, but carbon segregation is not increased; and the lowered specific water flow is reduced by 7.1%, and a conclusion is drawn as a matter of experience. After the proportion of cooling water in each area is adjusted under the specific water flow of 1.3 liter per kilogram, the proportion of the waste and defective products is the minimum when the proportions of the area I, the area II, the area III and the area IV are 34.98%, 42.36%, 12.32% and 10.34% respectively, the proportion of the waste and defective products is high when the proportion of water in the area II is 33.64%, 43.78%, 12.44% and 10.14%, the waste and defective products are determined according to the surface quality defect level of wires including scabs, sawteeth, shrinkage and other defects, the proportion of the waste and defective products which correspond to 32.11%, 46.79%, 11.47% and 9.63% is the maximum, and the proportion of the waste and defective products is the minimum when the specific water flow is 1.3 liter per kilogram and the proportion of the secondary cooling water in the area II 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(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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