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Invar alloy and continuous casting production method thereof

A technology of Invar alloy and production method, applied in the field of Invar alloy and its continuous casting production, can solve the problems of decreased strain resistance, easy occurrence of hot cracks on the surface, large temperature difference between the billet shell and the core, etc., so as to improve the tensile strength. Stress capacity, reduced crack susceptibility, effect of reduced cooling rate

Inactive Publication Date: 2020-06-23
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reasons for steel breakout accidents are: (1) Invar alloy has a large thermal expansion coefficient in the high temperature range above 500 ° C. During the pouring process of molten steel in the mold, the temperature drop of molten steel is large, resulting in the molten steel in the casting slab. There is a large thermal stress between the core and the shell, and the temperature difference between the shell and the core formed in the crystallizer is large, the strain resistance is reduced, and thermal cracks are prone to appear on the surface, and it is easy to break; (2) The high temperature toughness is poor, During the straightening process, the surface cracks are easy to expand, and the problem of steel breakout occurs

Method used

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  • Invar alloy and continuous casting production method thereof
  • Invar alloy and continuous casting production method thereof
  • Invar alloy and continuous casting production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The vertical bending continuous casting machine is used for the production method of Invar alloy continuous casting. The arc radius of the casting machine is 8000mm, the length of the vertical section is 2510mm, and the metallurgical length is 27600mm. The length of the slab is 9800mm, the width is 1260mm, and the thickness of the slab is 220mm. When smelting Invar alloy, the composition is controlled as follows by weight percentage: C: ≤0.05%, Si: ≤0.30%, Mn: 0.20-0.60%, P≤0.020%, S≤0.010%, Ni: 35.0-37.0% .

[0053] In the smelting stage of the converter, the phosphorus content in the molten steel and slag is reduced by slag removal or slag blocking after the furnace, wherein the phosphorus content in the outbound converter is reduced to below 0.003% (weight). The LF refining stage increased the reduction time to reduce the sulfur content to 0.001% by weight.

[0054] Control the cooling water flow rate of the crystallizer to 200-260m during the pouring stage 3 / h; ...

Embodiment 2

[0060] The vertical bending continuous casting machine is used for the production method of Invar alloy continuous casting. The arc radius of the casting machine is 8000mm, the length of the vertical section is 2510mm, and the metallurgical length is 27600mm. The length of the slab is 9800mm, the width is 1260mm, and the thickness of the slab is 220mm. When smelting Invar alloy, the composition is controlled as follows by weight percentage: C: ≤0.05%, Si: ≤0.30%, Mn: 0.20-0.60%, P≤0.020%, S≤0.010%, Ni: 35.0-37.0% .

[0061] In the smelting stage of the converter, the phosphorus content in the molten steel and slag is reduced by slag removal or slag blocking after the furnace, wherein the phosphorus content in the outbound converter is reduced to below 0.003% (weight). The LF refining stage increased the reduction time to reduce the sulfur content to 0.001% by weight.

[0062] Control the cooling water flow of the crystallizer to 240~260m in the pouring stage 3 / h; the emerg...

Embodiment 3

[0068] The vertical bending continuous casting machine is used for the production method of Invar alloy continuous casting. The arc radius of the casting machine is 8000mm, the length of the vertical section is 2510mm, and the metallurgical length is 27600mm. The length of the slab is 9800mm, the width is 1260mm, and the thickness of the slab is 220mm. When smelting Invar alloy, the composition is controlled as follows by weight percentage: C: ≤0.05%, Si: ≤0.30%, Mn: 0.20-0.60%, P≤0.020%, S≤0.010%, Ni: 35.0-37.0% .

[0069] In the smelting stage of the converter, the phosphorus content in the molten steel and slag is reduced by slag removal or slag blocking after the furnace, wherein the phosphorus content in the outbound converter is reduced to below 0.003% (weight). The LF refining stage increased the reduction time to reduce the sulfur content to 0.001% by weight.

[0070] Control the cooling water flow rate of the crystallizer to 200-230m during the pouring stage 3 / h; ...

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Abstract

The invention belongs to the field of a metallurgical continuous casting process, and particularly relates to an invar alloy and a continuous casting production method thereof. In the continuous casting production method of the invar alloy, a vertical-bending caster is adopted for continuous casting, wherein the flow rate of cooling water of a crystallizer is controlled to be 200-260 m<3> / h, the seedling emergence time is controlled to be 40-60 s, the cast-on casting speed is controlled to be 0.1-0.2 m / min, the speed raising acceleration at a cast-on speed raising stage is 0.04-0.06 m / min<2>,and the target casting speed is 0.70+ / -0.1 m / min. By means of the continuous casting production method of the invar alloy, the smooth production at the continuous casting stage of a continuous castingmachine can be ensured, and breakout accidents are prevented.

Description

technical field [0001] The invention belongs to the field of metallurgical continuous casting technology, and in particular relates to an invar alloy and a continuous casting production method thereof. Background technique [0002] In the range of room temperature - 200 ℃, Invar alloy is a special alloy with a very low coefficient of thermal expansion, which is almost constant with the change of external temperature, and has abnormal mechanical and magnetic properties. Because of its excellent low expansion characteristics, it was originally mainly used to manufacture precision instruments and parts that require constant dimensions in instruments, such as standard measuring tools and geodesic rulers. With the expansion of technology and application scope, such as liquefied natural gas storage tanks for long-distance ocean transportation, special transmission cables, base positioning devices for large electronic telescopes, Invar alloy molds for aerospace industry, liquid hyd...

Claims

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Application Information

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IPC IPC(8): B22D11/043B22D11/16B22D11/114B22D11/22B22D11/18C22C38/08C22C38/04C22C38/02
CPCB22D11/043B22D11/16B22D11/114B22D11/225B22D11/18C22C38/08C22C38/04C22C38/02C22C38/002
Inventor 薛利强张志鹏谷宇元鹏飞
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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