A range of different heat treatment processes are employed to achieve required mechanical properties.
Main heat treatment processes include hardening&tempering and case hardening.
hardening&tempering:
Hardening at 800℃~900℃, tempering at 420℃~650℃
case hardening:
Including carburizing and carbonitriding; hardening at 800℃~900℃, tempering at 160℃~250℃; With hardening layer 0.2mm-0.5mm.