Title:
HOT-DIP ZINC-COATED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/162561
Kind Code:
A1
Abstract:
Provided are: a hot-dip zinc-coated steel sheet, in which a hot-dip zinc-coating layer is provided on at least one surface of a matrix steel sheet, wherein the matrix steel sheet has a specified composition, and contains, in terms of volume fractions, 0 to 50% of ferrite, 0 to 30% of retained austenite, 5% or more of tempered martensite and 0 to 10% of fresh martensite and also contains perlite and cementite in a total amount of 0 to 5%, and, when a remainder structure is present, the remainder structure is made up by bainite, and wherein the concentration of B atom in a prior austenite grain boundary is 2.0 atm% or more, and the average effective crystal grain diameter is 7.0 μm or less; and a method for manufacturing the hot-dip zinc-coated steel sheet.
Inventors:
YOKOYAMA TAKAFUMI (JP)
KAWATA HIROYUKI (JP)
HAYASHI KUNIO (JP)
YAMAGUCHI YUJI (JP)
UCHIDA SATOSHI (JP)
KAWATA HIROYUKI (JP)
HAYASHI KUNIO (JP)
YAMAGUCHI YUJI (JP)
UCHIDA SATOSHI (JP)
Application Number:
PCT/JP2020/004651
Publication Date:
August 13, 2020
Filing Date:
February 06, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/60; C23C2/02; C23C2/06; C23C2/28; C23C2/40
Domestic Patent References:
| WO2018011978A1 | 2018-01-18 | |||
| WO2018055695A1 | 2018-03-29 | |||
| WO2019003541A1 | 2019-01-03 | |||
| WO2019187124A1 | 2019-10-03 | |||
| WO2014020640A1 | 2014-02-06 | |||
| WO2016113789A1 | 2016-07-21 |
Foreign References:
| JP2016050343A | 2016-04-11 | |||
| JP2006104532A | 2006-04-20 | |||
| JP2011184757A | 2011-09-22 | |||
| JP2013144830A | 2013-07-25 |
Other References:
See also references of EP 3922745A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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