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High-strength, high-toughness and easy-to-weld structural steel plate with yield strength of 620 MPa and preparation method thereof

A technology of yield strength and welded structure, which is applied in the field of high-strength, high-toughness and easy-to-weld structural steel plates with a yield strength of 620MPa and its preparation, can solve the problems of reducing the strength and yield ratio of steel plates, and achieve excellent welding performance and low cold crack sensitivity index , the effect of excellent low temperature toughness

Active Publication Date: 2021-05-18
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It focuses on the production of Q620E steel plate with good performance and easy welding by DQ+T process, but the strength and yield ratio of its steel plate are reduced

Method used

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  • High-strength, high-toughness and easy-to-weld structural steel plate with yield strength of 620 MPa and preparation method thereof
  • High-strength, high-toughness and easy-to-weld structural steel plate with yield strength of 620 MPa and preparation method thereof
  • High-strength, high-toughness and easy-to-weld structural steel plate with yield strength of 620 MPa and preparation method thereof

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preparation example Construction

[0034] The preparation method of the high-strength, high-toughness and easy-to-weld structural steel plate with a yield strength of 620MPa includes the following processes: molten iron pretreatment-converter steelmaking-LF refining outside the furnace-RH vacuum degassing-continuous casting-heating-phosphorus removal-rough rolling-finish rolling - cooling - straightening - shot blasting - quenching - tempering - cold straightening - ultrasonic flaw detection; of which:

[0035] In the molten iron pretreatment process: after the molten iron desulfurization pretreatment, the S content is ≤0.003%;

[0036] In the converter steelmaking process: the converter adopts low-sulfur scrap steel, adds nickel plate and other alloys, and the tapping temperature is ≥1620°C;

[0037] In the LF refining process: blow argon throughout the process to ensure that the white slag formation time is ≥ 15 minutes, and then add ferrochrome and ferromolybdenum to adjust the composition;

[0038] In the ...

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Abstract

The invention discloses a high-strength, high-toughness and easy-to-weld structural steel plate with yield strength of 620 MPa. The chemical components of the high-strength, high-toughness and easy-to-weld structural steel plate comprise, by weight, 0.06%-0.08% of C, 0.15%-0.25% of Si, 1.40%-1.50% of Mn, being less than or equal to 0.015% of P, being less than or equal to 0.005% of S, 0.10%-0.20% of Cr, 0.15%-0.25% of Ni, 0.20%-0.30% of Mo, 0.015%-0.025% of Nb, 0.010%-0.020% of Ti, 0.030%-0.040% of V, 0.0010%-0.0020% of B, 0.030%-0.050% of Al, and the balance Fe and inevitable impurities. The provided structural steel plate has more uniform and higher strength and excellent low-temperature toughness and welding performance.

Description

technical field [0001] The invention belongs to the technical field of metallurgical plate production, and in particular relates to a high-strength, high-toughness and easy-to-weld structural steel plate with a yield strength of 620 MPa and a preparation method thereof. Background technique [0002] High-strength structural steel plates with a yield strength of 620MPa have the characteristics of high strength, good toughness, excellent low-temperature toughness, good processability and weldability, wear resistance, and corrosion resistance. They are widely used in construction machinery, coal mining machinery, shipbuilding, and steel structures. [0003] Patent document CN103045966A discloses a high-quality high-yield strength structural steel S620QL1 steel plate and a production method thereof. It focuses on the smelting, rolling and heat treatment processes, and obtains S620QL1 with excellent mechanical properties, but the disclosed method consumes a lot of energy and incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/44C22C38/48C22C38/50C22C38/46C22C38/54C22C38/06C22C38/002C22C33/04C21D8/0205C21D8/0226C21D8/0263
Inventor 卢晓禹王少炳黄利杨雄袁晓鸣任丽芳董丽丽魏淼王海明王婷魏慧慧
Owner BAOTOU IRON & STEEL GRP
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