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For railway and rolling mill bearings that bear large impact loads, the main failure forms when used after M quenching are: inner sleeve cracking during assembly, outer ring flange falling off and inner ring cracking during use, while isothermal quenched bearings have good impact toughness and surface compressive stress, no matter whether the inner sleeve cracking during assembly or the tendency of outer sleeve flange falling off and inner sleeve cracking during use is greatly reduced, And it can reduce the edge stress concentration of the roller. Therefore, the average service life and reliability after isothermal quenching are higher than those after M quenching. Provided by Longma bearing
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