Title:
HIGH-STRENGTH GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/124157
Kind Code:
A1
Abstract:
Provided are a high-strength galvanized steel sheet that can ameliorate shear end cracking, and a method for manufacturing the same. The high-strength galvanized steel sheet is characterized by comprising a base steel sheet, and a zinc coating layer formed on the base steel sheet, the base steel sheet including a specific component composition and a steel structure comprising bainite, which has no ferrite or carbide, at an area ratio of 0-65%, bainite, which has martensite and a carbide, at an area ratio of 35-100%, and retained austenite at an area ratio of 0-15%, with the amount of diffusible hydrogen in the steel sheet being at most 0.00008% (including 0%) in terms of mass%, wherein the density of gaps that split the entire thickness of the zinc coating layer in a sheet thickness cross section perpendicular to the rolling direction of the zinc coating layer being at most 10 per mm.
Inventors:
HASEGAWA HIROSHI (JP)
NAKAGAITO TATSUYA (JP)
IKEDA GOSUKE (JP)
YOSHITOMI HIROMI (JP)
NAKAGAITO TATSUYA (JP)
IKEDA GOSUKE (JP)
YOSHITOMI HIROMI (JP)
Application Number:
PCT/JP2017/046839
Publication Date:
July 05, 2018
Filing Date:
December 27, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/06; C21D9/46; C22C38/60; C23C2/06; C23C2/40
Domestic Patent References:
WO2013047820A1 | 2013-04-04 | |||
WO2011065591A1 | 2011-06-03 | |||
WO2013018726A1 | 2013-02-07 | |||
WO2017131054A1 | 2017-08-03 | |||
WO2013047830A1 | 2013-04-04 |
Foreign References:
JP2009068039A | 2009-04-02 | |||
JP5971434B2 | 2016-08-17 |
Other References:
See also references of EP 3564400A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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