Title:
HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/080553
Kind Code:
A9
Abstract:
A hot-rolled steel sheet has a specified chemical composition, wherein, when the thickness of the steel sheet is defined as "t", a metallographic structure lying between a surface of the steel sheet and a depth t/4 from the surface in the steel sheet contains tempered martensite and/or lower bainite in a total volume fraction of 90% or more, the tensile strength is 980 MPa or more, and the average Ni concentration in the surface is 7.0% or more.
Inventors:
YOKOI TATSUO (JP)
HAYASHIDA TERUKI (JP)
SAKAKIBARA MUTSUMI (JP)
ANDO JUN (JP)
KAI SHINSUKE (JP)
SHUTO HIROSHI (JP)
HAYASHIDA TERUKI (JP)
SAKAKIBARA MUTSUMI (JP)
ANDO JUN (JP)
KAI SHINSUKE (JP)
SHUTO HIROSHI (JP)
Application Number:
PCT/JP2019/041314
Publication Date:
September 17, 2020
Filing Date:
October 21, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/58
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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