Patent ID: 7922968

Claim:
A steel sheet for an automotive muffler, comprising: 0.01% by weight or less of C; 0.1 to 0.3% by weight of Si; 0.3 to 0.5% by weight of Mn; 0.015% by weight or less of P; 0.015% or less by weight of S; 0.02 to 0.05% by weight of Al; 0.004% or less of N; 0.2 to 0.6% by weight of Cu; 0.01 to 0.04% by weight of Co; and a remainder of Fe and unavoidable impurities, wherein 60−280*C(%)−15*Si(%)−20*Mn(%)−12*Cu(%)−10*Co(%)≧35.