toughness to maintain its core part Slewing bearing

The main features of wind power bearing:
1 use in harsh environments
2 high maintenance costs
3 requires high life
Therefore, generally using a 42CrMo material after quenching IF quenching increase the surface hardness, toughness to maintain its core part.
58HRC surface hardness generally require more hardened layer depth control in general 3.5-5.0mm. (We processed products is such requirements) but the mechanical performance Rolling mill bearings requirements Slewing bearing more stringent, such as tensile strength, yield strength, reduction of area, elongation, impact energy J, hardness, etc. These parameters have specified national standards, but each agreement also based on technical requirements, often subject to change Roller Bearings Such as the national standard hardness 229-269HB, in order to improve its performance, in this many home instead 240-280HB.
Processing of this product:
1, to control the forging temperature, not coarse grains;
2, to control the modulation quality process to ensure that quenched their core part of the organization to ensure its mechanical properties;
3, IF quenching surface hardened layer depth control;
4, to avoid surface micro cracks.