HEAT AND CORROSION RESISTANT CAST AUSTENITIC STAINLESS STEEL ALLOY WITH IMPROVED HIGH TEMPERATURE STRENGTH

摘要

A heat and corrosion resistant cast austenitic stainless steel alloy which contains less than about 15% nickel. The alloy has a creep rupture life exceeding 3,000 hrs and a minimum creep rate of less than 1 x 10-3 at a stress of 100 MPa and a temperature of 75O°C, when creep tested in the as-cast state under ASTM El 39 test conditions. The alloy also has a 0.2% yield strength exceeding 130 MPa at 750°C in the as-cast state, and a decrease in 0.2% yield strength from 750 to 900°C of less than 20%; and, a completely austenitic microstructure after casting.