610MPa automobile girder steel and production method thereof

A manufacturing method, 610mpa technology, applied in the direction of temperature control, etc., can solve problems such as difficult to meet the requirements of forming process, plasticity reduction, etc.

Active Publication Date: 2010-06-23
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For general high-strength steel, when the strength reaches 600MPa, the plasticity is significantly ...

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  • 610MPa automobile girder steel and production method thereof
  • 610MPa automobile girder steel and production method thereof
  • 610MPa automobile girder steel and production method thereof

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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0011] A kind of 610MPa automobile girder steel of the present invention, the mass percent (wt%) of its chemical composition is: C: 0.08~0.12; Si: 0.10~0.30; Mn: 1.40~1.60; P≤0.010; S≤0.005; Nb : 0.040~0.060; V: 0.020~0.030; Ti: 0.010~0.030; Al: 0.030~0.060, a trace amount of Ca, the rest is iron and residual trace impurities.

[0012] The preferred mass percent (wt%) of the chemical composition of a kind of 610MPa automobile girder plate steel of the present invention is: C: 0.09~0.11; Si: 0.12~0.27; Mn: 1.45~1.59; P≤0.008; S≤0.003; Nb : 0.050~0.060; V: 0.020~0.030; Ti: 0.010~0.020; Al: 0.032~0.055, trace Ca, the rest is iron and residual trace impurities.

[0013] The role of the above chemical composition and its influence on the properties of the material are as follows:

[0014] C is a very important solid solution strengthening element. Increasing the...

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Abstract

The invention discloses a 610MPa automobile girder steel, and the weight percentage (wt%) of the chemical composition of the steel is as follows: C: 0.08 to 0.12; Si: 0.10 to 0.30; Mn: 1.40 to 1.60; P: less than or equal to 0.010; S: less than or equal to 0.005; Nb: 0.040 to 0.060; V: 0.020 to 0.030; Ti: 0.010 to 0.030; Al: 0.030 to 0.060; Ca: tiny amount; and the rest is iron and residual trace impurities. The invention also discloses a production method for the 610MPa automobile girder steel, which adopts a 2250mm hot rolling line, and a continuously cast slab is heated to 1200 DEG C to 1250 DEG C; after rough rolling, the temperature is 1000 DEG C to 1050 DEG C, the continuously cast slab enters a finishing mill via a heat cover and is rolled, the finish rolling temperature is 820 DEG C to 880 DEG C, and the rolled steel coil is rapidly cooled to 530 DEG C to 580 DEG C by way of laminar cooling, and is then coiled. Since the chemical composition and the production technique are adopted, the tensile strength of an automobile girder is larger than 610MPa, the yield strength is larger than 500MPa, the specific elongation is larger than 20 percent, minus 60 DEG C longitudinal impact energy AKV is larger than 70J, and the automobile girder has excellent cold formability and high fatigue strength. The product is applicable to heavy-duty automobile members such as side members and cross members, which are produced by cold-roll forming and stamping forming techniques.

Description

technical field [0001] The invention relates to the technical field of continuous hot-rolled metal strips, in particular to a steel material for high-strength automotive structural parts such as automotive longitudinal beams and beams and a manufacturing method thereof. Background technique [0002] Automobile girder is the most important safety component of the vehicle, and its material must have comprehensive properties such as good forming, welding, and fatigue resistance while requiring high strength. At present, the materials used in domestic commercial vehicle beams are mostly 510MPa and 550MPa beam plates. In the invention patent K with the application number CN200510024059.5, a kind of steel for elongated automobile beams and its manufacturing method is disclosed. The tensile strength can reach 580MPa by adding Nb, V, Ti multi-element micro-alloying elements, and the scope of application is only for manufacturing automobile beams by rolling process. The invention pa...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/74
Inventor 胡学文张建王炜杨兴亮刘永刚张宜赵勇闻成才张翠
Owner MAANSHAN IRON & STEEL CO LTD
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