800MPa grade high-ductility low-density steel and manufacturing method thereof

A manufacturing method and low-density technology, applied in the field of low-density steel and its manufacturing, can solve the problems of poor cold bending performance of steel plate, high manufacturing cost, center and edge cracks, etc.

Active Publication Date: 2015-09-23
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, the high content of C and Mn brings great difficulties to the manufacturability of the steel plate, which is manifested in the serious macro and micro segregation of the alloy elements insid

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  • 800MPa grade high-ductility low-density steel and manufacturing method thereof
  • 800MPa grade high-ductility low-density steel and manufacturing method thereof
  • 800MPa grade high-ductility low-density steel and manufacturing method thereof

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Embodiment Construction

[0074] The present invention will be further described in conjunction with the embodiments and the accompanying drawings.

[0075] Table 1 is the composition of the steel grades of the embodiments of the present invention and comparative examples, Table 2 is the manufacturing process of the steel grades of the embodiments of the present invention and comparative examples, and Table 3 is the retained austenite in the microstructure of the steel plates of the embodiments of the present invention and comparative examples The volume fraction, C content and mechanical properties of the steel plate.

[0076] The steel materials with the composition shown in Table 1 are smelted and cast to make billets. After the slab is heated at a reheating temperature (RHT) of 1200°C, the slab is hot-rolled, and the hot-rolling finish rolling is completed at a finishing temperature (FT) above 880°C. The thickness of the hot-rolled steel plate is about 3.2 mm. The hot-rolled steel plate is rapidly...

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Abstract

An 800MPa grade high-ductility low-density steel and a manufacturing method thereof. The steel comprises the following chemical composition by weight percentage: 0.25-0.50% of C, 0.25-4.0% of Mn, 3.0-7.0% of Al, no more than 0.02% of P, no more than 0.01% of S, no more than 0.01% of N, and the balance of Fe and inevitable impurity elements, and these elements meet the following relationship: 0.14<= (1.5C + 0.1Mn) /Al<=0.30. The manufacturing method comprises hot rolling, pickling, cold rolling and continuous annealing to prepare a low-density steel plate. In addition to ferrite, the microstructure of the steel plate also contains 6-30% of residual austenite, wherein the content of C in the residual austenite is not less than 0.8%. The steel plate has tensile strength higher than 800MPa, elongation higher than 25%, and density less than 7500kg/m<3>.

Description

technical field [0001] The invention relates to an 800MPa grade high ductility low-density steel and a manufacturing method thereof. Background technique [0002] The application of high-strength steel and advanced high-strength steel to replace traditional low-strength grade steel can increase the specific strength (ratio of strength to density) of automotive steel and reduce the thickness of structural parts to achieve lightweight automotive structures. Another effective way to increase the specific strength of automotive steel is to reduce the density of the steel on the basis of maintaining the excellent mechanical properties of the above-mentioned high-strength steel. Therefore, the development of low-density, high-strength and toughness steel plates is to meet the urgent need to further realize the lightweight of automobiles. [0003] The mechanical properties of high-strength steel are determined by its chemical composition and manufacturing process. These two factor...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/38C22C38/32C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C21D8/02
Inventor 杨旗张红王利金鑫焱王国栋毕文珍
Owner BAOSHAN IRON & STEEL CO LTD
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