Automotive cold-rolled high-strength steel and production method thereof

A high-strength steel and production method technology, applied in the field of metallurgical materials, can solve the problems of high carbon content and poor welding performance, and achieve the effects of high elongation after fracture, good stamping performance, and high elongation after fracture

Active Publication Date: 2019-01-04
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to realize the above-mentioned manufacturing method, the invention chooses to increase the content of carbon and manganese elements and reduce the alloying elements. Although the production cost is reduced, the content of carbon elements is high, and the weldability of the prepared product is not good in the later stage.

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  • Automotive cold-rolled high-strength steel and production method thereof
  • Automotive cold-rolled high-strength steel and production method thereof
  • Automotive cold-rolled high-strength steel and production method thereof

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with embodiment, but is not limited to the content on the description.

[0023] A cold-rolled high-strength steel for automobiles, the model is SPFC390, its chemical composition and mass percentage are: C≤0.006; Si: 0.10-0.20; Mn: 0.50-0.80; P: 0.06-0.10; S≤0.005; Al≤ 0.040; Ti: 0.040~0.060; N≤50ppm; the rest is Fe and unavoidable inclusions.

[0024] A production method of cold-rolled high-strength steel for automobiles comprises: blast furnace molten iron→converter smelting→RH refining→slab continuous casting→hot rolling→cold rolling.

[0025] Converter smelting adopts KR pre-desulfurized molten iron, deoxidation alloying of ferrosilicon, ferromanganese, ferroniobium and ferro-titanium alloys, and argon blowing and stirring in the whole process of molten steel.

[0026] After RH cycle for more than 3 minutes, add metal manganese, phosphorus iron, titanium iron and other alloys to adjust the composit...

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Abstract

The invention discloses automotive cold-rolled high-strength steel and a production method thereof. The high-strength steel comprises the following chemical components in percentages by mass: less than or equal to 0.006 of C, 0.10-0.20 of Si, 0.50-0.80 of Mn, 0.06-0.10 of P, less than or equal to 0.005 of S, less than or equal to 0.040 of Al, 0.040-0.060 of Ti, less than or equal to 50 ppm of N and the balance of Fe and inevitable impurities. The production method successively comprises the following steps: preparation of molten iron through a blast furnace, converter smelting, RH refining, slab continuous casting, hot rolling and cold rolling. By P, Si and Mn solution strengthening and Ti, C and N precipitation strength, the strength is improved, the tensile strength is improved while high fracture elongation is ensured, and meanwhile, high fracture elongation and good stamping property are ensured.

Description

technical field [0001] The invention relates to the field of metallurgical materials, in particular to a cold-rolled high-strength steel for automobiles and a production method thereof. Background technique [0002] At present, the rapid development of automobiles at home and abroad and the increasing attention to environmental issues, the energy-saving and safety of automobiles have attracted much attention from the industry. An important part of automobile energy saving focuses on the use of high-strength plates to reduce the weight of the car body. High-strength steel produced by aluminum-killed steel can meet the strength requirements for use, but there are deficiencies in stamping performance. [0003] Chinese invention patent (application number: CN201310442711X, application date: 2013-09-25) discloses a 440MPa grade cold-rolled high-strength automotive structural steel and its manufacturing method. The weight percentage of its chemical composition is: carbon: 0.06% ~ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C33/04B21C37/02
CPCB21C37/02C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 刘朋成刘妍宿成刘恩泽吴明明武利平孙婷婷
Owner BAOTOU IRON & STEEL GRP
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