Three phase heat treatment of steel sheet

Details Three phase heat treatment of steel sheet Three phase heat treatment of steel sheet

1976-05-20

1977-07-26

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

148 165, 148 166, 148134, C21D 714, C21D 178, C23C 1112, C23C 1118

Patent

active

040381099

ABSTRACT:
A medium-hard to hard thin steel sheet and a strip cut or stamped therefrom, both having an increased fatigue strength, are prepared by cold rolling a soft steel sheet, carburizing or carbo-nitriding the soft thinned sheet until a medium-hard to hard thin steel sheet is obtained and subjecting the resulting sheet or strip cut or stamped therefrom to a three-part heat treatment, which heat treatment involves first and second different austenizing operations, each followed by an identical two-step cooling operation, and a third lesser reheating and cooling operation.

REFERENCES:
patent: 3891474 (1975-06-01), Grange
patent: 3936324 (1976-02-01), Uchida et al.

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