AUSTENITIC STEEL ALLOY HAVING EXCELLENT CREEP STRENGTH AND RESISTANCE TO OXIDATION AND CORROSION AT ELEVATED USE TEMPERATURES

摘要

An austenitic steel alloy having excellent creep strength and resistance to oxidation and corrosion at elevated use temperatures up to approximately 750° C. has the following chemical composition (in weight %): 0.02≦̸C≦̸0.15%; 0.1≦̸Si≦̸2.0%; 25≦̸Cr≦̸33%; 22≦̸Ni≦̸38%; 1≦̸Mo≦̸6%; 0.4≦̸Nb≦̸1.5%; B≦̸0.0120%; 0.01≦̸N≦̸0.2%; Mn≦̸2%; Co≦̸5%; W≦̸2%; Al≦̸0.05%; Cu≦̸5%; Ti≦̸0.5%; Ta≦̸0.5%; V≦̸0.5%; P≦̸0.05%; S≦̸0.05%, Remainder iron with melting related impurities and optional addition of rare earths and reactive elements such as Ce, Hf, La, Re, Sc and/or Y of together 1%.