Ferrite-austenite stainless steel

Details Ferrite-austenite stainless steel Ferrite-austenite stainless steel

1976-05-14

1977-10-25

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

75125, 75128A, 75128F, 75128G, 75128N, 75128Z, 75128T, 75128W, C22C 3842

Patent

active

040554481

ABSTRACT:
Disclosed is an improved stainless steel in ferrite-austenite condition caused by solution heat treatment at a temperature of 1000.degree. - 1150.degree. C, composed of by weight percent, carbon up to 0.06%, silicon up to 1.0%, manganese up to 1.5%, nickel from 3.0% to 7.0%, chromium from 21.0% to 28.0%, copper up to 3.0%, molybdenum from 1.0% to 4.0%, boron from 0.0008% to 0.0080%, niobium from 0.08% to 0.7%, titanium from 0% to 0.5%, tantalum from 0% to 0.5%, zirconium from 0% to 0.5%, nitrogen up to 0.1%, and the remainder of iron and an inevitable amount of impurity, with the values of nickel equivalent and chromium equivalent calculated by the following equations:

REFERENCES:
patent: 2750283 (1956-06-01), Loveless
patent: 3306736 (1967-02-01), Rundell
patent: 3352666 (1967-11-01), Foster
patent: 3499802 (1970-03-01), Lagneborg
patent: 3567434 (1971-03-01), Richardson et al.
patent: 3740213 (1973-06-01), Hellner et al.
patent: 3785787 (1974-01-01), Yokota et al.
patent: 3795507 (1974-03-01), Allen
patent: 3856515 (1974-12-01), Brandis et al.
patent: 3865644 (1975-02-01), Hellner et al.
patent: 3926685 (1975-12-01), Gueussier et al.

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