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Low-phosphorus SA542TypeDCL4a steel plate and production method thereof

A production method and steel plate technology, applied in the field of metallurgy, can solve problems such as harsh service conditions and unsatisfactory requirements

Inactive Publication Date: 2018-11-02
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the use conditions become more and more harsh, SA387Gr22CL2 can no longer meet the needs of some equipment

Method used

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  • Low-phosphorus SA542TypeDCL4a steel plate and production method thereof
  • Low-phosphorus SA542TypeDCL4a steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical composition and mass percentage of the low-phosphorus SA542TypeDCL4a steel plate of this embodiment are: C: 0.15%, Si: 0.1%, Mn: 0.53%, Cr: 2.4%, Mo: 1.1%, V: 0.35%, S: 0.005%, P: 0.005%, the balance is Fe and inevitable impurity elements.

[0018] The production method of low-phosphorus SA542TypeDCL4a steel plate in this embodiment includes steelmaking, heating rolling and heat treatment processes. The specific process steps are as follows:

[0019] (1) Steelmaking: adopt electric arc furnace + refining furnace + die casting production process to make steel and prepare steel ingots, control the P in the molten steel after the electric arc furnace tapping: 0.004%, and control the P: 0.002% after the removal of P in the refining furnace; steel The liquid keeps vacuuming time for 20min, after vacuuming, the standing time is 10min;

[0020] (2) Heating and rolling: the steel ingot is heated and kept warm in a soaking furnace at a heating temperature of 1280°C for 3 ...

Embodiment 2

[0025] The chemical composition of the low-phosphorus SA542TypeDCL4a steel sheet and its mass percentage content in this embodiment are: C: 0.10%, Si: 0.08%, Mn: 0.40%, Cr: 2.1%, Mo: 0.9%, V: 0.30%, S: 0.004%, P: 0.003%, the balance is Fe and unavoidable impurity elements.

[0026] The production method of low-phosphorus SA542TypeDCL4a steel plate in this embodiment includes steelmaking, heating rolling and heat treatment processes. The specific process steps are as follows:

[0027] (1) Steelmaking: adopt electric arc furnace + refining furnace + die casting production process to make steel and prepare steel ingots, control P in molten steel after electric arc furnace tapping: 0.003%, control refining furnace P after de-P: 0.002%; steel The liquid keeps vacuuming time for 22min, after vacuuming, the standing time is 12min;

[0028] (2) Heating and rolling: the steel ingot is heated and kept in a soaking furnace at a heating temperature of 1230°C for 4 hours. After the billet is ope...

Embodiment 3

[0033] The chemical composition and mass percentage of the low-phosphorus SA542TypeDCL4a steel sheet of this embodiment are: C: 0.13%, Si: 0.07%, Mn: 0.52%, Cr: 2.3%, Mo: 0.99%, V: 0.32%, S: 0.005%, P: 0.004%, the balance is Fe and unavoidable impurity elements.

[0034] The production method of low-phosphorus SA542TypeDCL4a steel plate in this embodiment includes steelmaking, heating rolling and heat treatment processes. The specific process steps are as follows:

[0035] (1) Steelmaking: adopt electric arc furnace + refining furnace + die casting production process to make steel and prepare steel ingots, control the P in the molten steel after the electric arc furnace tapping: 0.004%, and control the P: 0.001% after the removal of P in the refining furnace; steel The liquid keeps vacuuming time for 23min, after vacuuming, the standing time is 13min;

[0036] (2) Heating and rolling: the steel ingot is heated and kept in a soaking furnace at a heating temperature of 1250°C for 3.3h...

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Abstract

The invention discloses a low-phosphorus SA542TypeDCL4a steel plate and a production method thereof. The steel plate comprises the chemical compositions of, by mass, 0.10-0.15% of C, no more than 0.1%of Si, 0.40-0.53% of Mn, 2.1-2.4% of Cr, 0.9-1.1% of Mo, 0.30-0.35% of V, no more than 0.005% of S, no more than 0.005% of P, and the balance Fe and unavoidable impurity elements. The production method comprises the processes of steelmaking, heating rolling and heat treatment. As for the low-phosphorus SA542TypeDCL4a steel plate, P is no more than 0.005%, and flaw detection conforms to NB / T47013.3I grade; after the steel plate is subjected to high-temperature long-time die welding treatment, the yield strength is 415-620 MPa, the tensile strength is 590-760 MPa, the elongation is larger thanor equal to 18%, the cross section reduction rate is larger than or equal to 45%, the impact value at the temperature of minus 30 DEG C is larger than or equal to 60 J, and the requirements of users can be met.

Description

Technical field [0001] The invention belongs to the field of metallurgy technology, and specifically relates to a low-phosphorus SA542TypeDCL4a steel plate and a production method. Background technique [0002] SA387Gr22CL2 steel plate is a heat-resistant heat-resistant steel and hydrogen-resistant steel widely used in the world. It has good high-temperature mechanical properties, high-temperature oxidation resistance, corrosion resistance, good toughness and weldability. However, as the conditions of use become more and more demanding, SA387Gr22CL2 can no longer meet the demand in the use of some equipment. The improved SA542TypeDCL4a with V added is a newly developed high-temperature and high-pressure reactor material in the world. Its strength, hydrogen resistance, temper embrittlement resistance, and hydrogen-induced peeling resistance are significantly improved compared to SA387Gr22CL2 steel. The order quantity of SA542TypeDCL4a steel plate is gradually increasing, and its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/22C22C38/24C22C38/02C21D8/02C21D1/28C21D1/18
Inventor 李杰侯敬超龙杰袁锦程吴艳阳牛红星尹卫江李样兵王东阳顾自有
Owner WUYANG IRON & STEEL
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