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Title:
HOT-DIP ZINC-COATED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/162562
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, 6 to 30% of retained austenite, 5% or more of bainite, 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%, the number density of tempered martensite having an equivalent circle diameter of 5.0 μm or more is 20 /1000 μm2 or less, and the area ratio of fresh martensite having an equivalent circle diameter of 2.0 μm or more after the application of 5% of plastic strain is 10% 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)
Application Number:
PCT/JP2020/004652
Publication Date:
August 13, 2020
Filing Date:
February 06, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/60; C23C2/02; C23C2/06; C23C2/28; C23C2/40
Domestic Patent References:
WO2015151427A12015-10-08
WO2018055695A12018-03-29
WO2019107042A12019-06-06
WO2019212047A12019-11-07
WO2017179372A12017-10-19
Foreign References:
JP2017053001A2017-03-16
Other References:
See also references of EP 3922744A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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