Title:
HOT-DIP GALVANIZED STEEL SHEET AND ALLOYED HOT-DIP GALVANIZED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2019/187124
Kind Code:
A1
Abstract:
A hot-dip galvanized steel sheet and an alloyed hot-dip galvanized steel sheet exhibiting an improved uniform ductility and local ductility, an improved yield strength and tensile strength, and improved low-temperature impact properties are characterized by having a prescribed component composition, and are characterized in that the metallographic structure of the steel sheets contains, in volume%, more than 5.0% retained austenite and more than 5.0% tempered martensite, the retained austenite contains at least 0.85 mass% C, and the ratio between the amount of C segregation (number of atoms/nm2>), [C]γgb and the amount of P segregation (number of atoms/nm2), [P]γgb at the prior austenite grain boundaries, i.e. [C]γgb/[P]γgb is at least 4.0.
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Inventors:
HAGA JUN (JP)
SANO KOHICHI (JP)
HAYASHI KOUTAROU (JP)
HAYASHI KUNIO (JP)
KAMEDA MASAHARU (JP)
UENISHI AKIHIRO (JP)
KAWATA HIROYUKI (JP)
SANO KOHICHI (JP)
HAYASHI KOUTAROU (JP)
HAYASHI KUNIO (JP)
KAMEDA MASAHARU (JP)
UENISHI AKIHIRO (JP)
KAWATA HIROYUKI (JP)
Application Number:
JP2018/013915
Publication Date:
October 03, 2019
Filing Date:
March 30, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/06; C21D9/46; C22C38/58; C23C2/06
Domestic Patent References:
WO2016199922A1 | 2016-12-15 | |||
WO2016113789A1 | 2016-07-21 | |||
WO2011111330A1 | 2011-09-15 | |||
WO2009096344A1 | 2009-08-06 |
Foreign References:
JP2001200338A | 2001-07-24 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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