Four methods for eliminating internal stress in steel balls

https://www.bearingroller.com/rolling-elements/steel-ball/

A.tempering heating method: using electric furnace, gas furnace, oil furnace heating - cooling;

B. Residual temperature tempering method: the steel ball after forging adopts the method of natural cooling by heat preservation;

C. Impact method: using a ball segment separator and a drum impact method;

D. Natural failure method: natural state, stress relief (the story of the turner is the natural failure method);