C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 7/06 (2006.01) C21D 7/02 (2006.01) C21D 7/13 (2006.01) C21D 8/02 (2006.01) C23C 28/00 (2006.01) C25D 5/26 (2006.01) C25D 5/48 (2006.01)
Patent
CA 2058678
ABSTRACT OF THE DISCLOSURE A nickel electroplated cold-rolled steel sheet excellent in press-formability and phosphating-treatability, which comprises: a cold-rolled steel sheet consisting of: carbon (C) : up to 0.06 wt.% silicon (Si) : up to 0.5 wt.%, manganese (Mn) : up to 2.5 wt.%, phosphorus (P) : up to 0.1 wt.%, sulfur (S) : up to 0.025 wt.%, soluble aluminum (Sol.Al) : up to 0.10 wt.%, nitrogen (N) : up to 0.005 wt.%, and the balance being iron (Fe) and incidental impurities; a nickel electroplating layer, formed on at least one surface of the cold-rolled steel sheet, in which layer nickel particles are precipitated at a distribution density of at least 1 x 1012/m2, the plating weight of the nickel electroplating layer being within a range of from 5 to 60 mg/m2 per surface of the cold-rolled steel sheet; and a nickel oxide film, formed on the surface of the nickel electroplating layer, having an average thickness within a range of from 0.0005 to 0.003 µm. The above-mentioned cold-rolled steel sheet may additionally contain at least one of up to 0.15 wt.% titanium (Ti) and up to 0.15 wt.% niobium (Nb). In the case where titanium and/or niobium are added, up to 0.003 wt.% boron (s) may also be additionally added.
Furuta Akihiko
Iwado Shuichi
Ono Tadashi
Watanabe Toyofumi
Yomura Yoshinori
Furuta Akihiko
Iwado Shuichi
Macrae & Co.
Nkk Corporation
Ono Tadashi
LandOfFree
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