460MPa grade cold-rolled microalloy high strength steel, and manufacturing method thereof

Abstract

The invention discloses 460MPa grade cold-rolled microalloy high strength steel. The 460MPa grade cold-rolled microalloy high strength steel comprises, by mass, 0.051 to 0.059% of C, 0.01 to 0.02% ofSi, 1.17 to 1.27% of Mn, 0.2 to 0.5% of Al, P<=0.010, S<=0.006, 0.03 to 0.05% of Nb, 0.07 to 0.08% of Ti, and the balance Fe and unavoidable impurities. A manufacturing method is combined with component design and manufacturing technology improvement, so that the obtained steel products are high in strength, percentage elongation, spot welding performance, and moulding performance, excellent platability is achieved, rebound deformation performance is small, problems in the prior art such as poor formation performance, weldability, and rebound performance of high strength steel of the same grade are solved, and obvious social benefit and economic benefit are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production and research, and in particular relates to a 460MPa grade cold-rolled micro-alloy high-strength steel and a manufacturing method thereof. Background technique [0002] Low-alloy high-strength steel is based on low-carbon manganese or silicon-manganese series. By adding a small amount of alloying elements, it forms carbides and nitrides with carbon, nitrogen and other elements and precipitates on the ferrite matrix to improve the strength of the steel. The strength is mainly used for automobile inner and outer covering parts, structural parts, supporting parts, etc. With the increasingly high strengthening requirements of automotive steel, high-strength steel with good formability and weldability has become a research hotspot in the automotive and other fields. [0003] Patent CN106929758A discloses a multi-stage cold-rolled low-alloy high-strength steel strip, its chemical compo...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of 460MPa grade cold-rolled micro-alloy high-strength steel and its manufacturing method in view of the deficiencies in the prior art. Combining composition design and manufacturing process improvement, the obtained steel product has high strength, high elongation, Good spot weldability and good formability, good platability and small springback deformation, solves the problems of poor formability, weldability, and poor springback performance of existing high-strength steels of the same level, and has significant social benefits and economic benefits

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