690MPa-grade quenched and tempered high-strength steel plate and production method thereof

A high-strength steel plate and production method technology, applied in the field of metallurgy, can solve problems such as inability to meet market demand, and achieve strong market competitiveness, good application prospects, and great benefits

Inactive Publication Date: 2018-08-24
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the amount of high-strength steel in the domestic manufacturing industry gradually increases, the country cannot meet the growing market demand

Method used

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  • 690MPa-grade quenched and tempered high-strength steel plate and production method thereof
  • 690MPa-grade quenched and tempered high-strength steel plate and production method thereof
  • 690MPa-grade quenched and tempered high-strength steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The 690MPa level quenched and tempered high-strength steel plate in this example has a thickness of 13 mm, and its chemical composition and mass percentage are: C: 0.18%, Si: 0.21%, Mn: 1.72%, P: 0.015%, S: 0.005%, V: 0.093%, B: 0.0032%, N: 0.0068%, and the rest are Fe and unavoidable impurity elements.

[0032] The production method of the 690MPa grade quenched and tempered high-strength steel plate in this embodiment includes smelting, heating, rolling, cooling, slow cooling, quenched and tempered heat treatment process, and the specific process steps are as follows:

[0033] (1) Smelting process: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, fed with Al wire 3.0m / t steel, white slag retention time 55min; lime consumption 19kg / t steel, process and slag removal [Al]: 0.018 %; The total refining time is 65 minutes. After the refining is completed, vacuum treatment is carried out in the hanging bag VD furnace. Before v...

Embodiment 2

[0041] The 690MPa level quenched and tempered high-strength steel plate in this example has a thickness of 28 mm, and its chemical composition and mass percentage are: C: 0.20%, Si: 0.28%, Mn: 1.93%, P: 0.012%, S: 0.003%, V: 0.106%, B: 0.0039%, N: 0.0092%, and the rest are Fe and unavoidable impurity elements.

[0042] The production method of the 690MPa grade quenched and tempered high-strength steel plate in this embodiment includes smelting, heating, rolling, cooling, slow cooling, quenched and tempered heat treatment process, and the specific process steps are as follows:

[0043] (1) Smelting process: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, fed with Al wire 3.5m / t steel, white slag retention time 60min; lime dosage 20kg / t steel, process and slag removal [Al]: 0.020 %; The total refining time is 68 minutes. After the refining is completed, vacuum treatment is carried out in the hanging bag VD furnace. VN alloy is a...

Embodiment 3

[0051] The 690MPa level quenched and tempered high-strength steel plate in this example has a thickness of 42 mm, and its chemical composition and mass percentage are: C: 0.21%, Si: 0.34%, Mn: 2.20%, P: 0.012%, S: 0.003%, V: 0.114%, B: 0.0042%, N: 0.0102%, and the rest are Fe and unavoidable impurity elements.

[0052] The production method of the 690MPa grade quenched and tempered high-strength steel plate in this embodiment includes smelting, heating, rolling, cooling, slow cooling, quenched and tempered heat treatment process, and the specific process steps are as follows:

[0053] (1) Smelting process: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, fed with Al wire 3.2m / t steel, white slag retention time 57min; lime consumption 21kg / t steel, process and slag removal [Al]: 0.019 %; The total refining time is 66 minutes. After the refining is completed, vacuum treatment is carried out in the VD furnace, and VN alloy is adde...

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Abstract

The invention discloses a 690MPa-grade quenched and tempered high-strength steel plate and a production method of the 690MPa-grade quenched and tempered high-strength steel plate. According to the chemical components, the 690MPa-grade quenched and tempered high-strength steel plate comprises, by mass percentage, 0.18%-0.22% of C, 0.20%-0.40% of Si, smaller than or equal to 0.025% of P, smaller than or equal to 0.015% of S, 1.7%-2.2% of Mn, 0.0060%-0.0120% of N, 0.090%-0.12% of V, 0.003%-0.005% of B and the balance Fe and inevitable impurity elements. The production method comprises the steps of a smelting working procedure, a heating working procedure, a rolling working procedure, a cooling working procedure, a slow cooling working procedure and a quenching and tempering thermal treatmentworking procedure, wherein a quenching and tempering technology is adopted by the quenching and tempering thermal treatment working procedure. According to the 690MPa-grade quenched and tempered high-strength steel plate and the production method of the 690MPa-grade quenched and tempered high-strength steel plate, the organization type of the steel plate is tempered sorbite and tempered martensite, the yield strength Rp0.2 of the steel plate is larger than or equal to 670MPa, the tensile strength Rm is larger than or equal to 730MPa, A50 is larger than or equal to 20%, the -20 DEG C transverseimpact energy is larger than or equal to 80J, and the surface hardness HB is larger than or equal to 360.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 690MPa grade quenched and tempered high-strength steel plate and a production method thereof. Background technique [0002] Most of the 70kg high-strength steel used in the domestic construction machinery industry comes from imports such as Japan WELTEN70C, SUMITEN70, Sweden SUMTIN690, the United States A514Gr.B and DILLMAX690 steel plates produced by German DILLINGER Steel Company, and the content of C (0.18%) in DILLMAX690 steel plates produced by German DILLINGER Steel Company Higher, Cr (1.50%), Ni (1.80%) alloy content is higher, the cost price of steel plate rises. The prices of the above-mentioned imported steels are generally high. [0003] As the amount of high-strength steel used in the domestic manufacturing industry gradually increases, the country cannot meet the growing market demand. In order to alleviate the supply shortage of high-strength stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C21D8/02C21D1/18C21C5/52
CPCC21C5/52C21D1/18C21D8/0226C21D8/0263C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/12C22C38/32Y02P10/20
Inventor 邓建军李建朝李杰刘丹龙杰王青王会岭赵喜伟袁平付振坡宋庆吉
Owner WUYANG IRON & STEEL
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