Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/209839
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a high-strength steel sheet having tensile strength, press formability, and bendability, and to provide a method for manufacturing the same.　The high-strength steel sheet has a predetermined component composition, and the mircostructure thereof has a specific structure in a surface layer region from the steel sheet surface to a position 1/10 of the sheet thickness and in an inner region from the position 1/10 of the sheet thickness to a position 3/10 of the sheet thickness. The average crystal grain size in the surface layer region from the steel sheet surface to a position 1/10 of the sheet thickness is at most 6 μm. The difference (HV2-HV1) between the hardness (HV1) of the surface layer region from the steel sheet surface to the position 1/10 of the sheet thickness and the hardness (HV2) of the inner region from the position 1/10 of the sheet thickness to the position 3/10 of the sheet thickness is 5-15% of [0.3 × tensile strength (Mpa)]. The high-strength steel sheet has a tensile strength of at least 980 Mpa, a uniform elongation of at least 6%, and the ratio R/t of the critical bending radius R and the sheet thickness t thereof is at most 1.5.

More Like This:
JP4743198Refractory steel for construction and its manufacturing method
WO/2015/029873THICK STEEL SHEET HAVING EXCELLENT FATIGUE PROPERTIES, AND METHOD FOR PRODUCING SAME
JPH0747772[Title of the Invention] A method for producing a high-strength hot-rolled steel sheet having excellent workability.
Inventors:
DOAN THI HUYEN (JP)
HASEGAWA HIROSHI (JP)
KIMURA HIDEYUKI (JP)
Application Number:
PCT/JP2022/011493
Publication Date:
October 06, 2022
Filing Date:
March 15, 2022
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; C21D9/46; C22C38/00; C22C38/06; C22C38/60
Domestic Patent References:
WO2018150955A12018-08-23
WO2016010004A12016-01-21
WO2020110855A12020-06-04
WO2020110843A12020-06-04
Foreign References:
JP2016050335A2016-04-11
JP2015190015A2015-11-02
JP2007100190A2007-04-19
JP2012012701A2012-01-19
JP2013117068A2013-06-13
JP2017115191A2017-06-29
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Next Patent: ULTRAVIOLET REFLECTIVE MATERIAL, METHOD FOR PRODUCING SAME, AND RAW MATERIAL COMPOSITION THEREFOR