STEEL SHEET, MEMBER, AND METHOD FOR PRODUCING SAME

Title:

STEEL SHEET, MEMBER, AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2023/188539

Kind Code:

A1

Abstract:

The present invention provides: a steel sheet having 590 MPa or greater TS, high YS, excellent press formability (ductility, hole expandability, and bendability), and fracture resistance characteristics (bending fracture characteristics and axial crushing characteristics) in a collision; a member; and a method for producing these.　A base steel sheet has a predetermined component composition, wherein when nano-hardness is measured at 300 or more points in a 50 µm x 50 µm region of a sheet plane located at the 1/4 depth position from the base steel sheet surface in a sheet thickness direction of a surface soft layer, the percentage of the points where the nano-hardness is 7.0 GPa or higher is 0.10 or less, a sheet plane located at the 1/4 depth position from the base steel sheet surface in the sheet thickness direction of the surface soft layer has a nano-hardness standard deviation σ of 1.8 GPa or lower, and a sheet plane located at the 1/2 depth position from the base steel sheet surface in the sheet thickness direction of the surface soft layer has a nano-hardness standard deviation σ of 2.2 GPa or lower.

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Inventors:

KAWASAKI YOSHIYASU (JP)
NAKAGAITO TATSUYA (JP)
YAMAMOTO SHUNSUKE (JP)
HOSHINO KATSUYA (JP)

Application Number:

PCT/JP2022/044175

Publication Date:

October 05, 2023

Filing Date:

November 30, 2022

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C21D9/46; C22C38/00; C22C18/00; C22C18/04; C22C38/06; C22C38/60; C23C2/06; C23C2/12; C23C26/00

Domestic Patent References:

WO2020184154A1	2020-09-17
WO2019181950A1	2019-09-26
WO2011025042A1	2011-03-03
WO2017168957A1	2017-10-05

Foreign References:

JP2017002384A

2017-01-05

Attorney, Agent or Firm:

KUMASAKA Akira et al. (JP)

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