CPC C22C 38/58 (2013.01) [C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/48 (2013.01); F01D 25/005 (2013.01)] | 18 Claims |
1. An austenitic stainless steel alloy, comprising, by weight:
20.0% to 21.5% chromium;
8.5% to 10.0% nickel;
4.0% to 5.0% manganese;
0.5 to 1.5% niobium;
0.5% to 1.0% silicon;
0.4% to 0.5% carbon;
0.24% to 0.3% nitrogen; and
a balance of iron with inevitable/unavoidable impurities,
wherein molybdenum, and tungsten are excluded from the alloy beyond impurity levels, and wherein the austenitic stainless steel alloy maintains a stable austenite phase up to a temperature above 1020° C. without a delta ferrite phase being substantially present, wherein the austenitic stainless steel alloy is in a form of a cast product and includes eutectic carbides of Nb, and wherein no delta ferrite phase is present or formed at any temperature above 1020° C. up to 1600° C.
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