Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1983-04-12
1985-07-23
Rutledge, L. Dewayne
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75125, 75128A, 75128F, 75128P, 75128G, 75128T, 376900, 148 12E, 148 12B, C22C 3840
Patent
active
045307199
ABSTRACT:
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 maximum, N; 0.02 to 0.08 P; 0.002 to 0.008 B; 0.004-0.010 S; 0.02-0.05 Nb; 0.01-0.05 V; 0.005-0.02 Ta; 0.02-0.05 Al; 0.01-0.04 Cu; 0.02-0.05 Co; 0.03 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.
REFERENCES:
patent: 4158606 (1979-06-01), Bloom et al.
patent: 4234385 (1980-11-01), Ozaki et al.
patent: 4407673 (1983-10-01), Korenko
patent: 4421572 (1983-12-01), Bates et al.
Y. Kondo et al., The Effects of Metallurgical Variables on Creep of Type 316 Stainless Steel, Radiation Effects in Breeder Reactor Structural Materials, Proceeding Confer., Jun. 19-23, 1977, Arizona, Met. Society of AIME, pp. 253-267.
M. Terasawa et al., The Influence of Metallurgical Variables on Void Swelling in Type 316 Steel.
Ibid, pp. 687-707.
Johnson Gerald D.
Powell Roger W.
Prizzi John J.
Rutledge L. Dewayne
Westinghouse Electric Corp.
Yee Debbie
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