Alloy resistant to seawater and corrosive process fluids

Details Alloy resistant to seawater and corrosive process fluids Alloy resistant to seawater and corrosive process fluids

1986-12-29

1989-04-04

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 46, 420 47, 420582, 420584, 420585, 420586, C22C 3842, C22C 3002

Patent

active

048184837

ABSTRACT:
An air-meltable, workable, castable, weldable, machinable, nonmagnetic alloy resistant to seawater and corrosive process fluids of the type that may be circulated in seawater-cooled heat exchangers. The alloy consists essentially of between about 3% and about 8% by weight manganese, between about 12% and about 28% by weight nickel, between about 17.3% and about 19% by weight chromium, between about 0.68% and about 3.51% by weight copper, between about 0.07% and about 0.25% by weight nitrogen, between about 5.9% and about 8% by weight molybdenum, up to about 0.08% by weight carbon, up to about 1.5% by weight silicon, up to about 0.66% by weight niobium, up to about 1.32% by weight tantalum, up to about 1% by weight vanadium, up to about 1% by weight titanium, up to about 0.6% by weight of a rare earth component selected from the group consisting of cerium, lanthanum, and misch metal, up to about 5% by weight cobalt, and between about 30% and about 56% by weight iron. The titanium equals at least five times any carbon contant in excess of 0.03% by weight. The sum of the cobalt and nickel contents should not be at least about 17% but not exceed about 28% by weight. The sum of the niobium content and one-half the tantalum content should not exceed about 0.66% by weight.

REFERENCES:
patent: 4400349 (1983-08-01), Kudo et al.
patent: 4421557 (1983-12-01), Rossomme et al.

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