30-10-2017 дата публикации
Номер: KR1020170119876A
Принадлежит:
The present invention relates to a cold-rolled steel sheet and a manufacturing method thereof and, more specifically, to a cold-rolled steel sheet with excellent surface properties, high strength, and high elongation, and a manufacturing method thereof. According to an embodiment of the present invention, the manufacturing method of a cold-rolled steel sheet comprises: a step of reheating a steel slab comprising 0.01-0.25 wt% of carbon (C), 0.01-1.5 wt% of silicon (Si), 3-8 wt% of manganese (Mn), 0.01-0.5 wt% of aluminum (Al), 0.05-0.15 wt% of tin (Sn), 0-1 wt% of chrome (Cr) (not including 0), 0-1 wt% of nickel (Ni) (not including 0), 0-0.1 wt% of titanium (Ti) (not including 0), 0-0.01 wt% of phosphorus (P) (not including 0), 0-0.001 wt% of sulfur (S) (not including 0), 0-0.005 wt% of nitrogen (N) (not including 0), and the remainder consisting of iron (Fe) and inevitable impurities; a step of hot-rolling, cooling, and rolling the steel slab to manufacture a hot-rolled steel sheet; a ...
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