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Title:
COATED STEEL MEMBER, COATED STEEL SHEET, AND METHODS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/203979
Kind Code:
A1
Abstract:
This coated steel member comprises a steel sheet base member of a given chemical composition, and a coating that contains Al and Fe and is formed on a surface of the steel sheet base member. The coating has a low Al content region that contains Al in an amount of 3 mass% to less than 30 mass%, and a high Al content region that contains Al in an amount of at least 30 mass% and is formed closer to the surface in comparison to the low Al content region. The maximum C content in the high Al content region is at most 25% of the C content of the steel sheet base member, the maximum C content in the low Al content region is at most 40% of the C content in the steel sheet base member, and the maximum C content in a range from the interface between the steel sheet base member and the coating to a depth of 10 μm on the steel sheet base member side is at most 80% of the C content in the steel sheet base member.

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Inventors:
TABATA SHINICHIRO (JP)
MAEDA DAISUKE (JP)
Application Number:
PCT/JP2020/014581
Publication Date:
October 08, 2020
Filing Date:
March 30, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C28/02; C21D9/46; C22C38/00; C22C38/60; C23C2/02; C23C2/12; C23C2/28; C23C10/28
Domestic Patent References:
WO2015182596A12015-12-03
WO2015182591A12015-12-03
WO2015033177A12015-03-12
WO2018151333A12018-08-23
WO2018151330A12018-08-23
WO2018151332A12018-08-23
WO2018151325A12018-08-23
Foreign References:
JP2004244704A2004-09-02
JPH08155572A1996-06-18
JP2007146201A2007-06-14
JP2016504488A2016-02-12
JPH07157883A1995-06-20
JP2019068658A2019-04-25
JP2002102980A2002-04-09
JP2012180594A2012-09-20
JP2012001802A2012-01-05
Other References:
See also references of EP 3951012A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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