With the advances in smelting technology

 such as vacuum smelting technology, which will enable the intrinsic quality of steel greatly reforms, especially oxygen content in steel and the formation of non-metallic inclusions have significantly reduced. With this high-carbon chromium bearing steel bearings, the fatigue life can grow exponentially.
According to a large experimental comparative data show that different methods to obtain smelting GCr15, GCr15SiMn, ZGCr15, ZGCr15SiMn bearing steel bearings.
(2) carburizing bearing steel
Carburizing Taper bearingsteel manufacturing rings and rolling elements, its hardness is: rings and rolling elements of HRc60 ~ 64, generally applicable, and the operating temperature range of -40 to 140 degrees Celsius, the oil and greased properly, can greater shock and vibration conditions, such as locomotives and rolling mill bearings, etc., but the steel heat treatment process is more complex.
   (3) heat-resistant bearing steel
 Bearing heat-resistant steel rolling the ferrule body, the hardness: ring and the roller is HRc60 ~ 64, the ball is HRc61 ~ 65, in the case of the normal lubrication is applicable to the temperature of 120 to 250 degrees Celsius, such as aircraft engines, gas turbines and other spindle working conditions.
(4) corrosion-resistant bearing steel
Corrosion resistant bearing steel rings and rolling elements, its hardness is: rings and rolling elements should not be less than HRc58, suitable for water, nitric acid, chemical reagents and other corrosive media, the temperature is -253 to 350 degrees Celsius.