Surface-treated steel sheet
AssigneeNippon Steel Corporation
InventorsKosuke KAWAMOTO, Yasuto GOTO, Masaharu OKA, Yuta DAIROKUNO, Yuji KAJII, Koki SHIMADA
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Abstract
A surface-treated steel sheet is provided that has excellent strength even when the surface-treated steel sheet is provided with a Ni—Co—Fe alloy layer. A surface-treated steel sheet of the present disclosure includes a steel sheet, and a Ni—Co—Fe alloy layer on a steel sheet surface. The steel sheet has a microstructure containing: ferrite, and one or more kinds selected from the group consisting of cementite, pearlite, and bainite having an area fraction of 1.2 to 5.0% in total. The Ni—Co—Fe alloy layer contains Ni, Co and Fe.
Claims14
1-6. (canceled)
A surface-treated steel sheet, comprising:
- a steel sheet having a microstructure containing:
- ferrite, and one or more kinds selected from a group consisting of cementite, pearlite, and bainite having an area fraction of 1.2 to 5.0% in total;
- and
- on a steel sheet surface,
- a Ni—Co—Fe alloy layer containing Ni, Co and Fe.
Dependencies are inferred from the claim text.