③ Long Service Life of Bearing Steel, Surface Defects, Including Cracks, Slag, Burrs, Oxide, Etc., Internal Defects, Including Shrinkage, Bubbles, White Spots, Strict Loose and Segregation. These Defects Have a Great Impact on the Processing Performance and Life of Bearings, Bearing Material Standards Clearly Stipulate That These Defects Are Not Allowed to Appear!
eBay