The material factors that affect the bearing life

   6812ZZ  6203N  NJ317EM  7319C/DF  LB8NY  7020AC/DB  6301-RS
  61812-2Z  6226-Z  HH224310  M84510  HR31311J  629Z  6311Z  71936CDF
Rolling the early failure mode of cracks, plastic deformation, wear, corrosion and fatigue, under normal conditions,

Main contact fatigue. In addition to the failure of the bearing parts outside service conditions, mainly due to the hardness, strength, toughness, wear

Resistance, corrosion resistance and stress state constraints. Affect the performance and status of these main underlying factors that have the following several.
1.1 quenched martensite in steels
Carbon chromium steel original organization granular pearlite, in state quenching and tempering, quenching martensite carbon content was significantly

Affect mechanical properties of steel. Strength, toughness, about 0.5%, the contact fatigue life of about 0.55%, compressive crushing capacity

0.42% or so, when the GCr15 steel quenched martensite carbon content of 0.5% to 0.56%, you can get the strongest anti-failure

Mechanical properties.
It should be noted, in this case obtained cryptocrystalline martensite
      6812ZZ 6203N NJ317EM 7319C/DF LB8NY 7020AC/DB 6301-RS
   61812-2Z 6226-Z HH224310 M84510 HR31311J 629Z 6311Z 71936CDF