Process for producing stainless steels for spring having a high

Details Process for producing stainless steels for spring having a high Process for producing stainless steels for spring having a high

1979-08-23

1981-05-05

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 38, 148125, C21D 702

Patent

active

042656796

ABSTRACT:
Stainless steels for springs having a high strength and an excellent fatigue resistance are produced by heat treating austenitic stainless steels having such a composition that austenite stability index, Md.sub.30. is 0.degree. C. to +80.degree. C. at a final annealing temperature of 750.degree.-1,150.degree. C., subjecting the thus treated steels to a primary working at a temperature from Md.sub.30 to 500.degree. C. at a reduction rate of not less than 20% and then subjecting said steels to a secondary working at a temperature lower than Md.sub.30 at a reduction rate of not less than 30%.

REFERENCES:
patent: 3871925 (1975-03-01), Nunes
patent: 3917492 (1975-11-01), Backman et al.
patent: 4042421 (1977-08-01), Van Den Sype et al.

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