Title:
COLD-ROLLED STEEL SHEET, METHOD FOR MANUFACTURING SAME, AND WELDED JOINT
Document Type and Number:
WIPO Patent Application WO/2023/063288
Kind Code:
A1
Abstract:
This cold-rolled steel sheet has a prescribed chemical composition and is such that the metal structure at a position 1/4-3/4 of the sheet thickness in the sheet thickness direction from the surface includes, by volume, 0-10.0% of retained austenite and 90.0-100% of one or two types of structures from among martensite and tempered martensite. In the metal structure at the aforementioned position, the P content at old γ grain boundaries is 10.0 mass% or less, the Mn content at the old γ grain boundaries is 10.0 mass% or less, and the tensile strength is 1,310 MPa or greater.
Inventors:
HASEGAWA ARISA (JP)
Application Number:
PCT/JP2022/037779
Publication Date:
April 20, 2023
Filing Date:
October 11, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/60
Domestic Patent References:
| WO2020129402A1 | 2020-06-25 | |||
| WO2020129403A1 | 2020-06-25 | |||
| WO2020209275A1 | 2020-10-15 | |||
| WO2020189767A1 | 2020-09-24 | |||
| WO2020026838A1 | 2020-02-06 |
Foreign References:
| JP2010248565A | 2010-11-04 | |||
| JP2021168157A | 2021-10-21 | |||
| JP6729835B1 | 2020-07-22 | |||
| JP2013104081A | 2013-05-30 |
Other References:
ANALYTIC CHEMISTRY, vol. 35, 1986
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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