NSK bearing parts in the heat treatment process, if it is heating in oxidizing medium, NSK bearing surface oxidation occurs so that spare parts surface mass fraction of carbon reduction, resulting in removal of carbon from the surface. Surface decarburized layer depth exceeds the final machining allowance for makes parts for scrap. Surface decarburization layer in metallographic test for determination of depth available in metallographic method and micro-hardness method. The distribution curve of surface layer hardness measurement shall prevail, may make the criterion of arbitration. Common quality defects after heat treatment, the NSK bearing parts: quenching microstructure of overheating, lack of heat, quench cracks, hardness, heat treatment deformation and surface decarbonization, soft enough points of NSK bearings, such as maintenance and repair. Overheating from the bearing components can be observed on the rough after quenching microstructure of overheating.
The importance of NSK bearings, mean when it is damaged, will cause the device to shut down, so this type of bearings should preferably install temperature scanners. Under normal circumstances, NSK bearings in the lubrication and lubrication of natural after rising temperatures and lasts 1-2 days.


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