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Ultrahigh strength hot-rolled complex phase steel plate and production method thereof

A production method and ultra-high-strength technology, applied in the field of hot-rolled steel plate rolling, can solve the problems of low grade, achieve good extension flangeability, reduce the difference in mechanical properties, and excellent hole expansion performance

Active Publication Date: 2018-12-18
ANGANG STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The tensile strength of the steel plate of this invention is partly 780MPa, which is a lower level

Method used

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  • Ultrahigh strength hot-rolled complex phase steel plate and production method thereof
  • Ultrahigh strength hot-rolled complex phase steel plate and production method thereof
  • Ultrahigh strength hot-rolled complex phase steel plate and production method thereof

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Embodiment

[0037] Ultra-high-strength hot-rolled multiphase steel plate and its production method, the chemical composition percentages of the hot-rolled multiphase steel plate are: C: 0.05% to 0.15%, Si: 0.1% to 0.8%, Mn: 1.2% to 2.3%, P≤0.012% , S≤0.005%, Cr: 0.20%~0.70%, Mo: 0.10%~0.50%, Nb: 0.02%~0.06%, Ti: 0.05%~0.13%, Als: 0.015%~0.060%, the rest are Fe and unavoidable impurities.

[0038] The production method of ultra-high-strength hot-rolled multi-phase steel plate, through two-stage controlled rolling and three-stage controlled cooling, the tensile strength can reach above 980MPa, and the microstructure is ferrite and bainite with a small amount of martensite and residual Austenitic multiphase steel plate.

[0039] The continuous casting slab of the above composition is heated to 1180-1280°C, and the slab is rolled in multiple passes on the rolling mill. The thickness of the intermediate slab is 35-45mm, preferably 40mm. The temperature is 840-950°C, and the cooling after rol...

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Abstract

The invention relates to an ultrahigh strength hot-rolled complex phase steel plate and a production method thereof. The ultrahigh strength hot-rolled complex phase steel plate comprises the followingchemical components of, by weight percentage, 0.05-0.15% of C, 0.1-0.8% of Si, 1.2-2.3% of Mn, no more than 0.012% of P, no more than 0.005% of S, 0.20-0.70% of Cr, 0.10-0.50% of Mo, 0.02-0.06% of Nb, 0.05-0.13% of Ti, 0.015-0.060% of Als and the balance Fe and inevitable impurities. The ultrahigh strength hot-rolled complex phase steel plate has the advantages that by controlling rolling and cooling, the effects of fine-grain strengthening, phase transformation strengthening and precipitation strengthening are comprehensively utilized, and the purposes that the high-strength performance of materials is maintained, the microhardness difference between two phases is reduced through precipitation strengthening, and the performance of chambering is improved are achieved.

Description

technical field [0001] The invention relates to the field of hot-rolled steel plate rolling, in particular to an ultra-high-strength hot-rolled multi-phase steel plate with a strength of 980 MPa and good hole expansion performance used in the field of automobile manufacturing and a production method. Background technique [0002] At present, the most challenging issues in the automobile manufacturing industry are the improvement of safety and crash performance, the reduction of fuel consumption and the reduction of environmental impact, and the application of cheap and reliable precision equipment. With regard to these aspects, the successful development of high-strength steels has solved some problems. The development and application of ultra-high-strength steel is an effective means to realize the lightweight of automobiles, which is in line with the development trend of energy saving, consumption reduction, environmental protection and safety of the new generation of auto...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/22C22C38/26C22C38/28C22C38/06C21D8/02
CPCC21D8/0226C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/38
Inventor 张宇时晓光韩斌董毅孙成钱陈妍刘仁东乔磊张吉富
Owner ANGANG STEEL CO LTD
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