Ultrahigh-strength welding structure steel plate and its manufacturing method

A welding structure and ultra-high strength technology, applied in the field of metal materials, can solve the problems of high steel cost, poor low temperature toughness, and high content of precious element Ni in the steel plate, and achieve the advantages of improving hardenability, good plasticity and reducing production costs. Effect

Inactive Publication Date: 2013-03-06
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] From the comparison of the above patents, we can see that the current patents for ultra-high-strength steel plates with a yield strength of about 900-1050 MPa have the main disa

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  • Ultrahigh-strength welding structure steel plate and its manufacturing method
  • Ultrahigh-strength welding structure steel plate and its manufacturing method
  • Ultrahigh-strength welding structure steel plate and its manufacturing method

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Embodiment Construction

[0024] Below in conjunction with specific embodiment the present invention is further described:

[0025] According to the chemical composition of the present invention and production process, smelting and rolling the steel grade of the present invention and the actual chemical composition of the comparison steel grade are as Table 1 and Table 2, and each embodiment of the invention steel carries out pretreatment of molten iron and deep desulfurization; adopts converter smelting, through Top-blowing or top-bottom combined blowing to control the P content; use VD, RH, LF, etc. for refining treatment, further desulfurization, degassing, control the H, O, N content in the steel, and carry out microalloying; carry out Ca treatment, Combining the S content in the steel and the tapping amount, feed the Si-Ca wire to ensure the Ca / S content Ca / S=0.5~2.0, so that the sulfide can be spheroidized, so as to improve the ductility, transverse impact energy and cold bending performance of th...

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Abstract

The invention discloses an ultrahigh-strength welding structure steel plate. The steel plate comprises 0.11-0.19% of C, 0.20-0.50% of Si, 0.90-1.40% of Mn, 0.005-0.030% of Ti, 0.30-1.00% of Cr, 0.1-0.5% of Cu, 0.15-0.35% of Ni, 0.15-0.60% of Mo, 0.010-0.050% of Als, 0.020% or less of P, 0.010% or less of S, 0.025-0.070% of V, 0.005% or less of Zr, and the balance Fe and inevitable impurities. Quenching and tempering treatments of the steel plate are carried out after rolling, the reheating temperature is 860-930DEG C, the temperature insulation is carried out for 1.0-2.5min/mm, and water quenching is carried out to obtain a quenching martensite structure; and a tempering treatment is carried out at 500-600DEG C, the heat insulation time is 1.0-3.0min/mm, and air cooling is carried out.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a steel plate for an ultra-high-strength welded structure with a yield strength of more than 900 MPa and a manufacturing method thereof. Background technique [0002] At present, the development trend in the field of machinery manufacturing such as truck cranes, heavy-duty trucks, concrete pump trucks, semi-trailers, and containers is to develop in the direction of high parameters and large-scale, so more and more ultra-high-strength welded structural steels are used. It is to reduce the weight, improve the carrying capacity and save energy. At the same time, ultra-high-strength steel plates are required to have the characteristics of low cost, good welding performance, and high low-temperature toughness. [0003] Ultra-high-strength steel plates are manufactured by quenching + tempering (Q+T), direct quenching + tempering (DQ+T) after rolling, controlled rolling and c...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21D8/02C21D1/18
Inventor 侯华兴张哲张涛杨颖刘明
Owner ANGANG STEEL CO LTD
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