C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/122
C22C 38/40 (2006.01) C22C 38/58 (2006.01) G21C 3/06 (2006.01) G21C 3/07 (2006.01)
Patent
CA 1217359
17 ABSTRACT OF THE DISCLOSURE This invention describes a composition for an austenitic stainless steel which has been found to exhibit improved high temperature stress rupture properties. The composition of this alloy is about (in wt.%): 12.5 to 14.5 Cr; 14.5 to 16.5 Ni; 1.5 to 2.5 Mo; 1.5 to 2.5 Mn; 0.1 to 0.4 Ti; 0.02 to 0.08 C; 0.5 to 1.0 Si; 0.01 maxi- mum, N; 0.02 to 0.08 P; 0.002 to 0.008 B; 0.004-0.010 S; 0.02-0.05 Nb; .01-.05 V; 0.005-0.02 Ta; 0.02-0.05 Al; 0.01-0.04 Cu; 0.02-0.05 Co; .03 maximum, As; 0.01 maximum, O; 0.01 maximum, Zr; and with the balance of the alloy being essentially iron. The carbon content of the alloy is adjusted such that wt.% Ti/(wt.% C+wt.% N) is between 4 and 6, and most preferably about 5. In addition the sum of the wt.% P + wt.% B + wt.% S is at least 0.03 wt.%. This alloy is believed to be particularly well suited for use as fast breeder reactor fuel element cladding.
442973
Johnson Gerald D.
Powell Roger W.
Oldham And Company
Westinghouse Electric Corporation
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