Dispersion strengthened ferritic stainless steel

Details Dispersion strengthened ferritic stainless steel Dispersion strengthened ferritic stainless steel

1978-08-14

1984-08-07

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 37, C22C 3828, C23C 1116

Patent

active

044642075

ABSTRACT:
Through-nitrided light gage ferritic stainless steels having a dispersion of metal-nitride particles at an interparticle spacing of less than about 10 microns. The resulting material has substantially improved strength at room and elevated temperatures over conventional ferritic stainless steels, exhibits ductility markedly above that commonly associated with nitrided articles, and is stronger than conventional 18Cr-8Ni austenitic stainless steel (T-304) for prolonged service above about 1400.degree. F. The nitriding is accomplished with atomic nitrogen at 1500.degree.-1800.degree. F. followed by heating to above 1800.degree. F. in a non-oxidizing atmosphere to remove excess nitrides.

REFERENCES:
patent: 3615904 (1971-10-01), Kindlimann et al.
patent: 3632456 (1972-01-01), Sakakura et al.
patent: 3804678 (1974-04-01), Kindlimann
patent: 3928088 (1975-12-01), Schlosser et al.
patent: 4046601 (1977-09-01), Hook
Smith et al., "Identification of Phases in a Nitrided Stainless Steel", Jour. Iron & Steel Inst., Jan. 1973, pp. 34-36.
Chen, "Dispersion Strengthening of Iron Alloys by Internal Nitriding", PhD Thesis, RPI, Troy, N.Y., 8/65.
Kindlimann et al., "Dispersion Strengthening Austenitic Stainless Steels by Nitriding", Metallurgical Transactions, vol. 1, (2/70), pp. 507-515.

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