Title:
薄鋼板及びその製造方法
Document Type and Number:
Japanese Patent JP6835046
Kind Code:
B2
Abstract:
To provide a thin steel sheet having tensile strength:780 MPa or more, and good strength homogeneity, steel sheet shape and surface quality, and a manufacturing method therefor.SOLUTION: There is provided a thins steel sheet having a specific component composition, and a steel structure with ferrite area percentage of 0% to 90%, bainite area percentage of 5% or less including 0%, martensite and tempered martensite area percentage of 10% or more including 100%, and retained austenite area percentage of 2.0% or less including 0%, and having standard deviation of yield strength in a width direction of 30 MPa or less, and maximum warpage of the sheet steel sheet when cut with length of 1 m of 10 mm or less.SELECTED DRAWING: Figure 1
Inventors:
High Noriaki Saka
Tomohiro Murakami
Kojiro Fujimoto
Takuya Hirashima
Tomohiro Murakami
Kojiro Fujimoto
Takuya Hirashima
Application Number:
JP2018143806A
Publication Date:
February 24, 2021
Filing Date:
July 31, 2018
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C22C38/00; C21D1/18; C21D9/46; C21D9/573; C22C38/06; C22C38/60
Domestic Patent References:
| JP2038532A | ||||
| JP2013177673A | ||||
| JP2011202195A | ||||
| JP2013227657A | ||||
| JP11193418A | ||||
| JP2003277833A |
Foreign References:
| WO2016084283A1 |
Attorney, Agent or Firm:
Isomura Tetsuro
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori