US 11,725,266 B2
Stainless steel alloys, turbocharger components formed from the stainless steel alloys, and methods for manufacturing the same
Pavan Chintalapati, Bangalore (IN); Philippe Renaud, Sanchey (FR); Piotr Gawron, Cracow (PL); and Bjoern Schenk, Commugny (CH)
Assigned to Garrett Transportation I Inc., Torrance, CA (US)
Filed by Garrett Transportation I Inc., Torrance, CA (US)
Filed on Oct. 30, 2019, as Appl. No. 16/668,997.
Prior Publication US 2021/0130942 A1, May 6, 2021
Int. Cl. C22C 38/02 (2006.01); C22C 38/48 (2006.01); C22C 38/04 (2006.01); C22C 38/58 (2006.01); C22C 38/00 (2006.01); F01D 25/00 (2006.01)
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
OG exemplary drawing
 
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.