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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.

Inventors:
HAGA, Jun (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
SANO, Kohichi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
HAYASHI, Koutarou (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
HAYASHI, Kunio (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
KAMEDA, Masaharu (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
UENISHI, Akihiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
KAWATA, Hiroyuki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/013915
Publication Date:
October 03, 2019
Filing Date:
March 30, 2018
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
C22C38/06; C21D9/46; C22C38/58; C23C2/06
Domestic Patent References:
WO2016199922A12016-12-15
WO2016113789A12016-07-21
WO2011111330A12011-09-15
WO2009096344A12009-08-06
Foreign References:
JP2001200338A2001-07-24
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, 〒1058423, JP)
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