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A kind of 460mpa grade cold-rolled micro-alloy high-strength steel and its manufacturing method

A high-strength steel and micro-alloy technology, applied in manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of weldability, poor rebound performance, and small rebound deformation, and achieve excellent rebound performance, good formability, The effect of high elongation

Active Publication Date: 2020-06-19
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

[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

Method used

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  • A kind of 460mpa grade cold-rolled micro-alloy high-strength steel and its manufacturing method
  • A kind of 460mpa grade cold-rolled micro-alloy high-strength steel and its manufacturing method
  • A kind of 460mpa grade cold-rolled micro-alloy high-strength steel and its manufacturing method

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Embodiment Construction

[0042] In order to better explain the present invention, the main content of the present invention is further clarified below in conjunction with specific examples, but the content of the present invention is not limited to the following examples.

[0043] Each embodiment of the present invention is produced according to the following steps:

[0044] 1) Converter steelmaking: smelting is carried out according to the design composition described in Table 1, and after the top-bottom compound blowing test steel of the industrial converter, considering the requirements of this steel type and the needs of large-scale production, the target temperature of tapping is set at about 1650°C. The bottom of the top-bottom compound blowing converter originally used 4 pieces of pinhole type air-permeable bricks. In order to reduce the content of molten steel [O] at the end of blowing, the number of air-permeable bricks was increased to 6 pieces; the furnace shape was also reasonably controlle...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02C21D9/00C21D1/26
CPCC21D1/26C21D8/0236C21D9/0081C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 王立辉
Owner 武汉钢铁有限公司
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