Title:
HIGH-STRENGTH Zn-Al-Mg-BASED SURFACE-COATED STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2018/220873
Kind Code:
A1
Abstract:
[Problem] To provide a high-strength hot dip Zn-Al-Mg-based plated steel sheet in which the in-steel concentration of hydrogen entering the steel in a plating line is remarkably lowered, and which exhibits the inherent excellent corrosion resistance of a Zn-Al-Mg-based plated layer. [Solution] A high strength surface-coated steel sheet comprising a Zn-Al-Mg-based coating layer disposed on the surface of a substrate steel sheet containing, in terms of % by mass, 0.01%-0.20% of C, 0.01%-0.50% of Si, 0.10%-2.50% of Mn, 0.005%-0.050% of P, 0.0005%-0.010% of B, 0.01%-0.20% of Ti, 0%-0.10% of Nb, 0%-0.50% of Mo, 0%-0.50% of Cr, 0.01%-0.10% of Al, and the balance Fe and inevitable impurities, wherein the diffusible hydrogen concentration in the substrate steel sheet is 0.30 ppm or less, and the time until rust is generated in a salt spray test is 7000 hours or longer.
Inventors:
FUJIWARA SUSUMU (JP)
UESUGI SHINYA (JP)
SHIGETOMI TOMOHARU (JP)
UESUGI SHINYA (JP)
SHIGETOMI TOMOHARU (JP)
Application Number:
PCT/JP2017/031654
Publication Date:
December 06, 2018
Filing Date:
September 01, 2017
Export Citation:
Assignee:
NISSHIN STEEL CO LTD (JP)
International Classes:
C23C2/06; C22C18/00; C22C18/04; C22C38/00; C22C38/38; C23C2/02; C23C2/26; C23C2/28
Domestic Patent References:
WO2013133270A1 | 2013-09-12 | |||
WO2007052683A1 | 2007-05-10 |
Foreign References:
JP2013142198A | 2013-07-22 | |||
JP2008279071A | 2008-11-20 | |||
JP2013241665A | 2013-12-05 | |||
JPH10317121A | 1998-12-02 | |||
JPH07150241A | 1995-06-13 | |||
JP2012172247A | 2012-09-10 | |||
JP5097305B1 | 2012-12-12 |
Other References:
YASUHIDE MORIMOTO ET AL.: "Kenzaimuke Kotaishokusei Yoyu Zn-Al-Mg-Si Gokin Mekki Koban "Superdyma"", NIPPON STEEL TECHNICAL REPORT, vol. 377, no. 377, 2002, pages 22 - 24, XP009517586, ISSN: 0300-306X
KOBE STEEL ENGINEERING REPORTS, vol. 50, no. 1, pages 65
See also references of EP 3633062A4
KOBE STEEL ENGINEERING REPORTS, vol. 50, no. 1, pages 65
See also references of EP 3633062A4
Attorney, Agent or Firm:
KOMATSU Takashi (JP)
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