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500mpa grade hot-rolled automotive structural steel plate with good weldability and manufacturing method

A technology for welding performance and automobile structure, applied in the field of hot-rolled steel strip production, can solve the problems affecting the application and promotion of materials, poor weldability of high-strength steel, etc., and achieve the effects of green manufacturing, excellent welding performance and stable performance.

Active Publication Date: 2020-02-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the structural parts in the body-in-white need to be welded, and the weldability of high-strength steel is generally poor, which affects the application and promotion of materials. Therefore, the production of 500MPa-class hot-rolled automotive structural steel plates with good weldability based on short processes is an urgent problem in this field. One of the technical difficulties of

Method used

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  • 500mpa grade hot-rolled automotive structural steel plate with good weldability and manufacturing method
  • 500mpa grade hot-rolled automotive structural steel plate with good weldability and manufacturing method
  • 500mpa grade hot-rolled automotive structural steel plate with good weldability and manufacturing method

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Effect test

Embodiment 1

[0039] The 500MPa grade of this embodiment has the hot-rolled automobile structural steel plate of good weldability, adopts " low carbon, low silicon, low manganese " Nb-Ti microalloy composition system to produce, and each element chemical composition mass percentage wt% is controlled as follows: C : 0.05%, Si: ≤0.07%, Mn: 1.05%, S: ≤0.005%, P: ≤0.015%, Nb: 0.036%, Ti: 0.035%, N: ≤40ppm, Als: 0.025~0.050%;

[0040] Its manufacturing method comprises the following steps:

[0041] 1) Smelting

[0042] According to the composition and weight percentage, it is uniformly mixed to form molten steel, and the deep desulfurization pretreatment-converter steelmaking-LF-RH process is used for smelting;

[0043] Hot metal desulfurization pretreatment requirements S: ≤0.005%, converter molten steel smelting requirements C 0.05%, tapping temperature at 1690°C; deoxidation and slagging in LF furnace, leaving station temperature ≥1653°C; molten steel enters RH furnace, Decarburization, deo...

Embodiment 2

[0063] The 500MPa grade of this embodiment has the hot-rolled automobile structural steel plate of good weldability, adopts " low carbon, low silicon, low manganese " Nb-Ti microalloy composition system to produce, and each element chemical composition mass percentage wt% is controlled as follows: C : 0.055%, Si: ≤0.08%, Mn: 1.10%, S: ≤0.004%, P: ≤0.015%, Nb: 0.036%, Ti: 0.037%, N: ≤40ppm, Als: 0.025~0.050%;

[0064] Its manufacturing method comprises the following steps:

[0065] 1) Smelting

[0066] According to the composition and weight percentage, it is uniformly mixed to form molten steel, and the deep desulfurization pretreatment-converter steelmaking-LF-RH process is used for smelting;

[0067] Hot metal desulfurization pretreatment requirement S: ≤0.004%, converter molten steel smelting requirement C is 0.055%, tapping temperature at 1674°C; deoxidation and slagging in LF furnace, leaving station temperature ≥1635°C; molten steel enters RH furnace, Decarburization, ...

Embodiment 3

[0087] The 500MPa grade of this embodiment has the hot-rolled automobile structural steel plate of good weldability, adopts " low carbon, low silicon, low manganese " Nb-Ti microalloy composition system to produce, and each element chemical composition mass percentage wt% is controlled as follows: C : 0.055%, Si: ≤0.07%, Mn: 1.15%, S: ≤0.003%, P: ≤0.015%, Nb: 0.036%, Ti: 0.038%, N: ≤40ppm, Als: 0.025~0.050%;

[0088] Its manufacturing method comprises the following steps:

[0089] 1) Smelting

[0090] According to the composition and weight percentage, it is uniformly mixed to form molten steel, and the deep desulfurization pretreatment-converter steelmaking-LF-RH process is used for smelting;

[0091] Hot metal desulfurization pretreatment requires S ≤ 0.003%, converter molten steel smelting requires C to be 0.055%, and the tapping temperature is 1680°C; deoxidation and slag formation in the LF furnace, the leaving station temperature is ≥ 1645°C; molten steel enters the RH ...

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Abstract

The invention discloses a 500MPa-grade hot-rolled automotive structural steel plate with a good welding property and a manufacturing method. The 500MPa-grade hot-rolled automotive structural steel plate comprises the following chemical elements in percent by weight: 0.03-0.06% of C, 1.0-1.3% of Mn, 0.035-0.045% of Nb, 0.035-0.045% of Ti, smaller than 0.10% of Si, smaller than or equal to 0.005% ofS, smaller than or equal to 0.015% of P, smaller than or equal to 40ppm of N, 0.025-0.050% of acid-soluble aluminum and the balance of Fe and unavoidable impurities. An Nb-Ti microalloying technologyis adopted in a short process; through adoption of a low-carbon component design, the carbon equivalent in steel is reduced; meanwhile, trace Ti is used for fixing S and N in steel (S is smaller thanor equal to 0.005% and N is smaller than or equal to 40ppm); the fine grain effects and the precipitation strengthening effects of Nb and Ti are fully played, and a fine F+P texture and fine precipitates of Nb and Ti are obtained; the welding property of a steel grade is improved while relatively high strength is achieved.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled iron and steel strip production, and in particular relates to a 500MPa-level hot-rolled automotive structural steel plate with good welding performance and a manufacturing method. Background technique [0002] In recent years, my country's automobile industry has continued to develop at a high speed, which has had a huge impact on social energy supply and environmental protection. With the increasing pressure of environmental protection, a series of programmatic documents have been promulgated in China, clearly pointing out that my country's manufacturing industry should accelerate the transformation of green manufacturing and ecological development. Existing research shows that lightweight is the most effective measure to achieve energy saving and emission reduction of automobiles, and high strengthening of steel materials is an important technical path to realize lightweight automobiles. Gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/12C22C38/14C22C38/02C22C38/06C22C33/04C21D8/02
Inventor 魏兵毛新平张超刘永前孔君华汪水泽朱万军刘斌郑海涛黄海娥
Owner 武汉钢铁有限公司
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