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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.
