Metal treatment – Stock – Ferrous
Patent
1990-01-12
1991-01-15
Yee, Deborah
Metal treatment
Stock
Ferrous
420 61, C22C 3842
Patent
active
049850911
ABSTRACT:
Low-nickel, low-molybdenum, air-meltable air-castable, fabricable, weldable, duplex stainless steel alloys of an austenitic-ferritic matrix that are essentially free of martensite and sigma phase. The alloys are not only substitutable for the various austenitic 18% chromium - 8% nickel grades of stainless steels but possess superior corrosion resistance properties to those prior art steels. The alloys consist essentially of between about 2% and about 5% of weight nickel, between about 23% and 28% by weight chromium, between about 0.50% and about 1% by weight molybdenum, between about 0.50% and about 4% by weight copper, between about 0.10% and about 0.60% by weight tungsten, between about 0.08% and about 0.32% by weight nitrogen, up to about 2% by weight manganese, up to about 1% by weight silicon, up to about 0.08% by weight carbon, and the balance essentially iron. The alloys may optionally contain up to about 0.45% by weight vanadium, up to about 0.65% by weight columbium, up to about 0.6% by weight cobalt, up to about 0.0007% by weight boron, up to about 0.6% by weight tantalum and up to about 0.5% by weight titanium.
REFERENCES:
patent: 3082082 (1963-03-01), Bidwell et al.
patent: 4721600 (1988-01-01), Maehara et al.
patent: 4798635 (1989-01-01), Bernhardsson et al.
Carondelet Foundry Company
Yee Deborah
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