High-strength Q630GJ steel plate and production method thereof

A technology of Q630GJ and production method, which is applied in the field of high-strength Q630GJ steel plate and its production, can solve the problems of increasing steel plate production cost, complex process, long cycle, etc., to increase tempering stability, reduce residual stress and brittleness, and improve strength and toughness effects

Inactive Publication Date: 2017-08-29
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese patent with the publication number CN105132826A discloses a thick-gauge low-yield-ratio high-strength structural steel and its preparation method, which adds a variety of microalloying elements (V, Cr, Mo, Ti, Nb, Ni, Cu, B) to ensure the strength and toughness of the steel, which relatively increases the production cost of the steel plate. This high-energy-consuming production technology does not have an advantage in the reduced-volume production of high-quality steel market, and the heat treatment process implements quenching+returning Fire, complex process, long cycle, high cost

Method used

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  • High-strength Q630GJ steel plate and production method thereof
  • High-strength Q630GJ steel plate and production method thereof
  • High-strength Q630GJ steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The thickness of the high-strength Q630GJ steel plate in this example is 10 mm, and the V-Ni-Nb-Ti microalloy composition design is adopted. The chemical composition and mass percentage are: C: 0.07%, Si: 0.20%, Mn: 1.40%, P: 0.012%, S: 0.005%, Alt: 0.015%, V: 0.040%, Ni: 0.40%, Nb: 0.02%, Ti: 0.025%, and the balance is Fe and trace unavoidable impurities.

[0030] The production process of the high-strength Q630GJ steel plate of this embodiment includes rolling and heat treatment, and the specific steps are as follows:

[0031] (1) Rolling process: Type II controlled rolling process is adopted, the cumulative reduction in the first stage reaches 40%, and the thickness of the steel is 80mm; the starting temperature of the second stage is 900°C, and the final rolling temperature is 780°C. After rolling, the steel plate enters the ACC quickly. After cooling, the red temperature is 500°C.

[0032] (2) Heat treatment process: the steel plate is tempered, the tempering temp...

Embodiment 2

[0035] The thickness of the high-strength Q630GJ steel plate in this example is 30mm, and the V-Ni-Nb-Ti microalloy composition design is adopted. Its chemical composition and mass percentage are: C: 0.10%, Si: 0.30%, Mn: 1.45%, P: 0.010%, S: 0.010%, Alt: 0.045%, V: 0.041%, Ni: 0.45%, Nb: 0.025%, Ti: 0.015%, and the balance is Fe and trace unavoidable impurities.

[0036] The production process of the high-strength Q630GJ steel plate of this embodiment includes rolling and heat treatment, and the specific steps are as follows:

[0037] (1) Rolling process: Type II controlled rolling process is adopted, the cumulative reduction in the first stage reaches 35%, and the thickness of the steel is 100mm; the starting temperature of the second stage is 890°C, the final rolling temperature is 815°C, and the rolled steel plate enters the ACC quickly. After cooling, the red temperature is 532°C.

[0038] (2) Heat treatment process: Temper the steel plate, the tempering temperature is 2...

Embodiment 3

[0041] The thickness of the high-strength Q630GJ steel plate in this embodiment is 50 mm, and the V-Ni-Nb-Ti microalloy composition design is adopted. The chemical composition and mass percentage are: C: 0.14%, Si: 0.60%, Mn: 0.95%, P: 0.020%, S: 0.003%, Alt: 0.040%, V: 0.044%, Ni: 0.38%, Nb: 0.028%, Ti: 0.018%, and the balance is Fe and trace unavoidable impurities.

[0042] The production process of the high-strength Q630GJ steel plate of this embodiment includes rolling and heat treatment, and the specific steps are as follows:

[0043](1) Rolling process: Type II controlled rolling process is adopted. The cumulative reduction in stage I reaches 36%, and the thickness of the steel is 120mm; After cooling, the red temperature is 550°C.

[0044] (2) Heat treatment process: the steel plate is tempered, the tempering temperature is 250°C, and the total heating time is 75min.

[0045] The mechanical properties and organization of the steel plate obtained are shown in Table 1; ...

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Abstract

The invention discloses a high-strength Q630GJ steel plate and a production method thereof. A V-Ni-Nb-Ti microalloy component design is adopted by the steel plate. The steel plate is prepared from the following microalloy chemical components in percentage by weight: 0.04%-0.045% of V, 0.35%-0.45% of Ni, 0.02%-0.03% of Nb and 0.015%-0.025% of Ti. The production method comprises a rolling procedure and a thermal treatment procedure. Through reasonable component design, controlled rolling and cooling and a low-temperature tempering process, the high-strength steel plate with good mechanical property is obtained. According to the steel plate, the tissue is tempered ferrite+martensite+bainite, the yield ratio is smaller than or equal to 0.83, the maximal thickness of the steel plate is 80mm and the localization of the tempered high-strength steel plate with low yield ratio is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength Q630GJ steel plate and a production method thereof. Background technique [0002] With the increasing number of large-scale high-rise buildings in China and the rapid development of steel frame structures, the use of high-strength construction steel can greatly reduce the amount of steel used, and the steel plates for construction are developing in the direction of high strength, high performance and large size. The domestic market of high-grade construction steel is in short supply, and the supply is tight, and the price of imported steel is generally high. In this economic situation, the market demand for high-strength steel is increasing, and higher requirements are put forward in terms of strength and toughness. Foreign companies such as Japan's Nippon Steel JFE and Kobe Steel have developed ultra-high-strength earthquake-resistant steel plates...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/08C22C38/14C22C38/04C22C38/02C22C38/06C21D8/02
CPCC22C38/12C21D8/0226C21D8/0263C21D2211/002C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14
Inventor 邓建军王晓书高雅张朋张海军张志军徐腾飞耿宽宽
Owner WUYANG IRON & STEEL
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