Gold-colored steel sheet and manufacturing method thereof
AssigneePosco
InventorsJung-Hyun Kong, Sang Seok Kim, Mi Nam Park
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Abstract
The present invention discloses a gold-colored steel sheet capable of expressing color without peeling of a modified layer and the gold-colored steel sheet capable of forming a color-modified layer through a conventional annealing process without expensive facilities. A method of manufacturing the gold-colored steel sheet according to an embodiment of the present invention can form a TiN modified layer on a surface of a steel sheet comprising 0.3 to 1.5 wt % of titanium (Ti) by an annealing treatment in a nitrogen (N2) atmosphere at 900 to 1,200° C. for 30 to 300 seconds.
Claims6
A gold-colored steel sheet comprising a base material and a modified layer provided on an outermost surface layer of the base material,
- wherein the modified layer is a TiN modified layer comprising 30 wt % or more of Ti and 10 wt % or more of N,
- wherein the TiN modified layer has a thickness of 20 to 120 nm, and
- wherein alloy element contents in the TiN modified layer satisfy the following formula (1):
- 0.1 wt %≤C+Si+Al+Mn+Cr+Ni+Nb+Zr≤35.0 wt % (1)
- here, C, Si, Al, Mn, Cr, Ni, Nb and Zr mean the content (wt %) of each element.
Dependencies are inferred from the claim text.