HOT-DIP GALVANIZED STEEL SHEET AND ALLOYED HOT-DIP GALVANIZED STEEL SHEET

WIPO Patent Application WO/2019/187124

A1

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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HAGA JUN (JP)
SANO KOHICHI (JP)
HAYASHI KOUTAROU (JP)
HAYASHI KUNIO (JP)
KAMEDA MASAHARU (JP)
UENISHI AKIHIRO (JP)
KAWATA HIROYUKI (JP)

JP2018/013915

October 03, 2019

March 30, 2018

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NIPPON STEEL CORP (JP)

C22C38/06; C21D9/46; C22C38/58; C23C2/06

WO2016199922A1	2016-12-15
WO2016113789A1	2016-07-21
WO2011111330A1	2011-09-15
WO2009096344A1	2009-08-06

JP2001200338A

2001-07-24

AOKI, Atsushi et al. (JP)

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