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Method for producing high-carbon steel by dual-flow slab continuous casting machine

A slab continuous casting machine and high-carbon steel technology, applied in the field of continuous casting, can solve problems affecting production stability, center segregation, internal cracks, etc., and achieve low steel inclusion content, reliable and stable quality, and stable molten steel quality Effect

Active Publication Date: 2021-03-30
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when high-carbon steel is produced by continuous casting of two-strand slabs, problems are likely to occur in the internal quality of the slab, such as defects such as central looseness, central segregation, and internal cracks. During the production of cast slabs, it is easy to access the slag circle, and operators need to frequently carry out slag removal operations, which not only affects the production stability but also affects the quality of the cast slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In our company, high carbon steel slabs with a thickness of 210mm and a width of 1290mm are produced.

[0023] (1) The composition of high carbon steel is C: 0.48wt%, Si: 0.28wt%, Mn: 0.63wt%, P: 0.018wt%, S: 0.011wt%, Als: 0.008wt%, the rest is Fe and unavoidable of impurities.

[0024] (2) The liquid high carbon steel molten steel temperature in the ladle tank is 1550°C.

[0025] (3) The ladle tank to the tundish tank is poured with long nozzle + sealing gasket + argon non-oxidation protection, and the surface of the molten steel in the tundish tank is artificially added with a covering agent to isolate it from the air.

[0026] (4) The pouring from the tundish tank to the crystallizer adopts submerged nozzle + argon gas protection, and high-carbon steel mold slag is artificially added into the mold to isolate it from the air. The mold slag consumption is 0.42kg / t steel.

[0027] (5) The temperature of the molten steel in the tundish tank is 1518°C.

[0028] (6) Th...

Embodiment 2

[0034] In our company, high carbon steel slabs with a thickness of 230mm and a width of 1290mm are produced.

[0035] (1) The composition of high carbon steel is C: 0.50wt%, Si: 0.28wt%, Mn: 0.72wt%, P: 0.016wt%, S: 0.003wt%, Als: 0.011wt%, the rest is Fe and unavoidable of impurities.

[0036] (2) The temperature of molten high carbon steel in ladle tank is 1540℃.

[0037] (3) The ladle tank to the tundish tank is poured with long nozzle + sealing gasket + argon non-oxidation protection, and the surface of the molten steel in the tundish tank is artificially added with a covering agent to isolate it from the air.

[0038] (4) The tundish tank to the crystallizer is poured with submerged nozzle + argon gas protection, and high-carbon steel mold slag is artificially added into the mold to isolate it from the air. The mold slag consumption is 0.41kg / t steel.

[0039] (5) The temperature of molten steel in the tundish is 1508°C.

[0040] (6) The cooling water of the crystalliz...

Embodiment 3

[0046] In our company, high carbon steel slabs with a thickness of 230mm and a width of 1290mm are produced.

[0047] (1) The composition of high carbon steel is C: 0.54wt%, Si: 0.28wt%, Mn: 0.68wt%, P: 0.015wt%, S: 0.008wt%, Als: 0.015wt%, the rest is Fe and unavoidable of impurities.

[0048] (2) The temperature of liquid high carbon steel molten steel in the ladle tank is 1545°C.

[0049] (3) The ladle tank to the tundish tank is poured with long nozzle + sealing gasket + argon non-oxidation protection, and the surface of the molten steel in the tundish tank is artificially added with a covering agent to isolate it from the air.

[0050] (4) The pouring from the tundish tank to the crystallizer adopts submerged nozzle + argon gas protection, and high-carbon steel mold slag is artificially added into the mold to isolate it from the air. The mold slag consumption is 0.43kg / t steel.

[0051] (5) The temperature of molten steel in the tundish is 1510°C.

[0052] (6) The crys...

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Abstract

The invention discloses a method for producing high-carbon steel by a dual-flow slab continuous casting machine. The method comprises the following steps: pouring liquid high-carbon steel molten steelfrom a steel ladle tank to a tundish tank through a long nozzle, pouring the liquid high-carbon steel molten steel into a crystallizer through a submersed nozzle, and cooling and solidifying the liquid molten steel in the crystallizer to form a slab shell with uniform thickness and a liquid core, along with the continuous casting pulling speed, solidifying the slab shell in a secondary cooling chamber, and finally cutting the slab shell into required fixed-length slab through a flame cutting machine. When the method is used for producing the high-carbon steel on the dual-flow slab continuouscasting machine, center porosity and center segregation of the high-carbon steel can be reduced, surface defects are reduced, and the quality of the high-carbon steel continuous casting is improved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and in particular relates to a method for producing high-carbon steel by a two-strand slab continuous casting machine. Background technique [0002] High carbon steel is mainly used to make precision tools, also known as tool steel. However, when high carbon steel is produced by continuous casting of two-strand slabs, the internal quality of the slab is prone to problems, such as defects such as central looseness, central segregation, and internal cracks, and severe horizontal and vertical cracks on the surface. During the production of cast slabs, the slag circle is easy to be connected, and operators need to frequently carry out slag removal operations, which not only affects production stability but also affects the quality of cast slabs. Contents of the invention [0003] The purpose of the present invention is to provide a method for producing high-carbon steel with a twin-stra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D11/111B22D11/115B22D11/22C22C38/02C22C38/04C22C38/06
CPCB22D11/18B22D11/111B22D11/225B22D11/115C22C38/02C22C38/04C22C38/06C22C38/002
Inventor 厚健龙曹树卫欧阳瑜黄重郭永谦孙拓高新军向华徐筱芗李洪燃陈丛虎张勇王向松李堃于永业成晓举刘伟云
Owner ANYANG IRON & STEEL