Steels combining toughness and machinability

Details Steels combining toughness and machinability Steels combining toughness and machinability

C - Chemistry, Metallurgy

22

C

75/15, 148/28, 1

C22C 38/00 (2006.01) C21D 8/00 (2006.01)

Patent

CA 1092861

STEELS COMBINING TOUGHNESS AND MACHINABILITY ABSTRACT OF THE DISCLOSURE 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 mixtutre, 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.

283667

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