Which of the following types of surface hardening heat treatment heat treatment does not belong to?① cementation② quality speech③ flame hardening law④ tempering
Which of the following does not belong to the surface hardening heat treatment of the type of heat treatment? ① carburizing ② nitriding ③ flame hardening method ④ quench
in the heat treatment of the surface hardening heat treatment does not belong to it.① carburizing method② oxidation method③ flame hardening method④ quenching