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The macrostructure of bearing steel is generally loose, central porosity and flat, microscopic (high times tissues including the annealing microstructure, carbide, steel mesh strip and liquid etc.. Carbide eliquation of hard and brittle, harmfulness and its the same brittle inclusion. Net carbide decreases the impact toughness of the steel, the organization and make no uniform, easy to deformation and cracking when quenching. The banded carbide effect of annealing and quenching and tempering organization and contact fatigue strength. Low, high times organization quality has great influence on the performance, and the service life of the rolling bearing in the bearing material so, standard of low, high times the organization has strict requirements.
Special surface and internal defects strict requirements
On the import of IKO bearing steel, surface defects include cracks, slag, burrs, scarring, oxide, internal defects including shrinkage, bubbles, white spot, serious osteoporosis and segregation. Have a great impact on these defects for processing, the performance and service life of bearing, the bearing material standards specified does not allow these defects.
Particularly strict requirements of carbide nonuniformity
In the bearing steel, if appear serious uneven distribution of carbides, uneven in the heat treatment process is easy to cause the microstructure and hardness of the steel, the structure inhomogeneity on contact fatigue strength has great influence. In addition, serious heterogeneity of carbides is also easy to make the bearing parts crack in quenching, carbide nonuniformity will lead to import IKO bearing life reduces therefore, bearing material in standard, special requirements of different specifications of the steel are clearly.