Cast stainless steel having excellent heat resistance and machinability

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PROBLEM TO BE SOLVED : To provide austenitic stainless cast steel which has high heat resistance so as to be usable even at a high temperature exceeding 950 deg.C, and has good machinability as well. SOLUTION : The stainless cast steel has an alloy composition containing, by weight, 0.2 to 0.4% C, 0.5 to 2.0% Si, 0.5 to 2.0% Mn, <=0.10% P, 0.04 to 0.2% S, 8.0 to 42.0% Ni, 15.0 to 28.0% Cr, 0.5 to 7.0% W, 0.5 to 2.0% Nb, <=0.02% Al, <=0.05% Ti, <=0.15% N and 0.001 to 0.50% Se, and the balance Fe with inevitable impurities. If required, the stainless cast steel may contain Mo, Zr, B, Co, Ca and rare earth metals in specified amounts.