Birch, Stewart, Kolasch & Birch, LLP
Surface-treated steel sheet and method for manufacturing surface-treated steel sheet
A surface-treated steel sheet of the present invention includes a base steel sheet and a Ni—Co—Fe alloy-plated layer on at least one surface of the base steel sheet, in which, in the alloy-plated layer, a Ni coating weight is 7.1 to 18.5 g/m2, a Co coating weight is 0.65 to 3.6 g/m2, and a total of the Ni coating weight and the Co coating weight is in a range of 9.0 to 20.0 g/m2. In a surface layer of the alloy-plated layer, a Co concentration is in a range of 20 to 60 atom %, and a Fe concentration is in a range of 5 to 30 atom %. In the alloy-plated layer, a region having a thickness of 2 μm or more, in which a total of a Ni concentration and the Co concentration is 10 atom % or more and the Fe concentration is 5 atom % or more, is present. The base steel sheet has a predetermined chemical composition, and a ferrite grain size number is 10 or more.
NIPPON STEEL CORPORATION
C C H H C C B C C H C C C C C C C Y C C C C H C H C
C21D C22C H01M H01M C21D C21D B32B C22C C25D H01M C21D C25D C25D C21D C25D C21D C21D Y02E C25D C21D C21D C21D H01M C22C H01M C22C
additional inventional inventional additional additional additional inventional inventional inventional inventional additional inventional inventional additional inventional inventional additional additional inventional additional additional additional additional inventional inventional inventional
Kiyokazu Mamoru Takehiro Yasuto
Ishizuka Saito Takahashi Goto