Patent ID: 8815146
Filing Date: 2014-08-26
Classification: C21D,C22C

Abstract:
1. An austenitic stainless steel alloy, consisting essentially of, in weight percent: 2.5 to 4 Al; 25 to 35 Ni; 12 to 19 Cr; at least 1, up to 4 total of at least one element selected from the group consisting of Nb and Ta; 0.5 to 3 Ti; less than 0.5 V; 0.1 to 1 of at least one element selected from the group consisting of Zr and Hf; greater than 0.05, to 0.2 C; greater than 0.01, to 0.1 B; and base Fe, wherein the weight percent Fe is greater than the weight percent Ni, wherein said alloy forms an external continuous scale comprising alumina, and contains coherent precipitates of γ′-Ni