Steels combining toughness and machinability

Details Steels combining toughness and machinability Steels combining toughness and machinability

1976-07-29

1978-05-09

Stallard, W.

Metal treatment

Compositions

Heat treating

148 124, 148 36, C21D 120

Patent

active

040885119

ABSTRACT:
A method for strengthening of carbon and low alloy steels and steels produced thereby wherein a carbon or low alloy steel is partially austenitized to produce a ferrite-austenite mixture, the resulting ferrite-austenite mixture is quenched to an intermediate temperature to render the austenite metastable, with the quenching being at a rate sufficient to avoid transformation of the austenite to ferrite and pearlite, and working the quenched steel at a temperature up to the maximum temperature at which bainite can exist whereby the ferrite-austenite mixture is converted to a ferrite-bainite mixture having high levels of machinability, strength and toughness.

REFERENCES:
patent: 3240634 (1966-03-01), Nachtman
patent: 3340102 (1967-09-01), Kulin et al.
patent: 3423252 (1969-01-01), Grange
patent: 3444008 (1969-05-01), Keough
patent: 3806378 (1974-04-01), Bramfitt et al.

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