Effect on high carbon chrome rolling bearings components the service life of main material factors and control degree:

 

(1) steel quenching the original organization in before the carbide requirements small, dispersion. Can use austenite turn 630 ℃, 420 ℃ high temperature, also can use forged waste heat fast annealing process to achieve.

 

(2) for GCr15 steel quenching, asking for an average of around 0.55% the carbon content of hidden crystal martensite, about 9% Ar and 7% is well , round the state not dissolve the microstructure of carbon. Available quench heating temperature and time to control get this microstructure.

 

(3) the low temperature quenching parts after tempering requirement surface residual have larger compressive stress, which will help to the improvement of the fatigue resistance. Can be used in quench heating surface short time when carburizing or filter nitrogen treatment process technology, make a larger surface residual stress.

 

(4) manufacturing steel bearing parts, the requirement is of high grade, main is to reduce O2, N2, P, oxides and phosphate content of content. Can use electricity slag remelting, vacuum smelting technology measures to make materials oxygen levels than 15 PPM is advisable.
Make the high quality bearing, the most key link in here.
 



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