Internally nitrided ferritic stainless steel strip, sheet and fa

Details Internally nitrided ferritic stainless steel strip, sheet and fa Internally nitrided ferritic stainless steel strip, sheet and fa

1976-06-30

1977-09-13

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

75126D, 148 37, 148 166, C22C 3840, C21D 148

Patent

active

040479811

ABSTRACT:
Internally nitrided ferritic stainless steel cold reduced strip and sheet and products fabricated therefrom having an elevated temperature creep strength and oxidation resistance superior to AISI Type 316 austenitic stainless steel, and good room temperature formability. A non-hardenble AISI Type 400 series ferritic stainless steel containing a nitride former (titanium, zirconium, hafnium, columbium, vanadium, tantalum or rare earth metals) in excess of the amount required to react completely with residual nitrogen and carbon in the steel is reacted with nitrogen internally by heat treatment in a nitrogen-hydrogen atmosphere at a temperature of at least about 800.degree. C but below that at which austenite will form under conditions precluding formation of chromium nitrides, chromium oxides, and austenite.

REFERENCES:
patent: 3615904 (1971-10-01), Kindlimann
patent: 3632456 (1972-01-01), Sakakura et al.
patent: 3928088 (1975-12-01), Schlosser et al.

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