Heat treatment for ball bearing steel to improve resistance to r

Details Heat treatment for ball bearing steel to improve resistance to r Heat treatment for ball bearing steel to improve resistance to r

1976-02-02

1977-05-17

Stallard, W.

Metal treatment

Compositions

Heat treating

148 36, 148144, C21D 940

Patent

active

040239888

ABSTRACT:
A method (and resulting product) for preparing bearing components is disclosed. Utilizing a low alloy steel shape containing carbon in the range of 0.6-1.5% and containing alloying ingredients in the range of 1-2% selected from the group consisting of Cr, Mn, Ni, Cu and Mo (and preferably the ingredients of SAE 52100 steel), the steel shape is subjected sequentially to a spheroidizing-anneal heat treatment, a rough forming treatment, and a hardening-heat treatment. Immediately prior to the hardening-heat treatment, a fine bainitic or preferably pearlitic microstructure is established having relatively thin carbide films at prior austenite grain boundaries. Austenitizing of said pearlitic or bainitic microstructure is carried out at a temperature in the range of 1625.degree.-1675.degree. F for a period of time preferably between 15 seconds and one-half hour, but operationally for a period of time as short as 5 seconds and as long as 1 hour.

REFERENCES:
patent: 3595711 (1971-07-01), Faunce et al.
patent: 3895972 (1975-07-01), Woodilla, Jr. et al.

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