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High-strength steel plate and manufacturing method thereof

A technology of high-strength steel plates and manufacturing methods, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as difficulty in meeting all these requirements

Inactive Publication Date: 2021-06-18
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] However, in the high-strength steel sheets disclosed in Patent Documents 1 to 4, it is difficult to satisfy all of these requirements, so a high-strength steel sheet that can satisfy all of these requirements is required.

Method used

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  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof

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Embodiment Construction

[0049] As a result of diligent research, the present inventors found that in steel having a predetermined composition, by making the steel structure (metal structure) achieve a ferrite fraction: 5% or less, tempered martensite and tempered bainite Total fraction of body: 60% or more, residual γ amount: 10% or more, average size of MA: 1.0 μm or less, corresponding to the half value of the Mn concentration distribution in the carbon-concentrated region of the retained austenite portion Width: 0.3% by mass or more, and the q value of small-angle X-ray scattering is 1nm －1 Scattering intensity: 1.0cm －1 Below, the product of tensile strength (TS), yield strength ratio (YR), (TS) and total elongation (EL) (TS×EL), hole expansion rate (λ), and fracture during tensile test can be obtained It is a high-strength steel sheet with a high level of thickness reduction ratio (RA) (impact resistance), ultimate bulging height, and spot-welded cross tensile strength (SW cross tensile).

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Abstract

A high-strength steel sheet containing C: 0.15% by mass to 0.35% by mass, the total of Si and Al: 0.5% by mass to 3.0% by mass, Mn: 1.0% by mass to 4.0% by mass, P: not more than 0.05% by mass, S: 0.01% by mass or less, the balance is composed of Fe and unavoidable impurities, in the steel structure, the ferrite fraction is 5% or less, and the total fraction of tempered martensite and tempered bainite is 60% As above, the amount of retained austenite is 10% or more, the average size of MA is 1.0 μm or less, and the half value width of the concentration distribution of Mn in the carbon-concentrated region equal to the amount of retained austenite is 0.3% by mass or more, Small angle X-ray scattering has a q value of 1nm －1 The scattering intensity at 1.0cm －1 the following.

Description

technical field [0001] The present disclosure relates to a high-strength steel sheet that can be used in various applications including automobile parts. Background technique [0002] Steel sheets used for automotive parts, etc., take into account the improvement of strength and the improvement of impact resistance in order to achieve both weight reduction and collision safety. [0003] For example, Patent Document 1 discloses a high-strength steel sheet in which fine TiN particles of 0.5 μm or less are generated by heating the slab to 1210° C. or higher and controlling hot rolling conditions, and suppressing the particle size as the starting point of low-temperature fracture from 1 μm or more. The generation of AlN particles, thereby trying to improve the impact resistance characteristics. [0004] Patent Document 2 discloses a high-strength steel sheet in which the amount of C is 0.45% to 0.77%, the amount of Mn is 0.1% to 0.5%, and the amount of Si is 0.5%. Al, N, O add...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D1/18C21D9/46C22C38/06
CPCC21D1/18C21D1/19C21D6/005C21D6/008C21D9/48C22C38/02C22C38/04C22C38/06C21D9/46C22C38/00C22C38/002
Inventor 柿内艾丽佳村上俊夫大谷茂生二村裕一村田忠夫
Owner KOBE STEEL LTD
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