then pass into the carbon, medium carbon into the workpiece surface, chain in order to improve the hardness and wear resistance. quenching. parts :after heated to a certain temperature in heat treatment equipment, heat preservation time, and then according to the requirements in different mediumcooling...
then pass into the carbon, medium carbon into the workpiece surface, chain in order to improve the hardness and wear resistance. quenching. parts :after heated to a certain temperature in heat treatment equipment, heat preservation time, and then according to the requirements in different mediumcooling...
then pass into the carbon, medium carbon into the workpiece surface, chain in order to improve the hardness and wear resistance. quenching. parts :after heated to a certain temperature in heat treatment equipment, heat preservation time, and then according to the requirements in different mediumcooling...
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