Heat-resistant austenitic stainless steel and a production process thereof

摘要

To provide a heat-resistant austenitic stainless steel having high-temperature strength and sag-resistance capable of resisting working temperatures of not less than 550 DEG C as well as being low in cost, and a production process thereof. The steel consistent with the present invention contains not more than 0.1wt% C, less than 1.0wt% Si, 1.0wt% to 10.0wt% Mn, not more than 0.03wt% P, not more than 0.01wt% S, 0.01wt% to 3.0wt% Cu, 7.0wt% to 15.0wt% Ni, 15.0wt% to 25.0wt% Cr, 0.5wt% to 5.0wt% Mo, not more than 0.03wt% Al, 0.4wt% to 0.8wt% N, and the remainder substantially consisting of Fe and unavoidable impurities.