The Webb Law Firm
Stainless steel having superior surface quality and moldability for fuel cell divider sheet, and method for manufacturing same
Provided is a ferrite-based stainless steel having superior moldability when molding a fuel cell divider sheet from a material by controlling yield point elongation in accordance with alloy components. The ferrite-based stainless steel comprises, in weight percentages: no more than 0.02% of C; no more than 0.02% of N; no more than 0.4% of Si; no more than 0.2% of Mn; no more than 0.04% of P; no more than 0.02% of S; 25.0-32.0% of Cr; 0-1.0% of Cu; no more than 0.8% of Ni; no more than 0.01-0.5% of Ti; no more than 0.01-0.5% of Nb; no more than 0.01-1.5% of V; and residual Fe and inevitable elements, wherein the content of Ti, Nb, V, C, and N in terms of weight % of steel uses Formula (1) to render a yield point elongation of the material of no more than 1.1%, and wherein a steel material has superior moldability.9.1C−1.76V+5.37(C+N)/Ti−1.22Nb≦0.7.  Formula (1)
POSCO
C C C H C C C C Y C C C C C C C C Y C C
C22C C21D C22C H01M C21D C22C C22C C21D Y02P C22C C22C C22C C21D C22C C21D C21D C22C Y02E C22C C21D
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Jong Hee Yang Jin Ki-Hoon Yun Yong Sang Woo
Kim Chung Jo Lee Lee