Heat treatment for ball bearing steel

Details Heat treatment for ball bearing steel Heat treatment for ball bearing steel

C - Chemistry, Metallurgy

21

D

75/144, 148/31

C21D 6/00 (2006.01) C21D 1/78 (2006.01) C21D 9/36 (2006.01) C21D 9/40 (2006.01)

Patent

CA 1090620

A NEW HEAT TREATMENT FOR BALL BEARING STEEL TO IMPROVE RESISTANCE TO ROLLING CONTACT FATIGUE ABSTRACT OF THE DISCLOSURE A method (and resulting product) for preparing bearing components is disclosed. Utilizing a low alloy steel shape containing carbon in the range of .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 peralitic or bainitic microstructure is carried out at a temperature in the range of 1625-1675°F for a period of time preferably between 15 seconds and 1/2 hour, but operationally for a period of time as short as 5 seconds and as long as 1 hour.

270614

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