... USD1000~50000/set Certification:CE&ISO:9002 usage:quenching the metal IF quenching equipment is comprised of IF power supply ... pieces, such as diamond, saw blade, drill bit, turning tool, hard metal, gear, crank shaft, axle shaft, and fastener, tooth-by-tooth ... hardness of quenching, no change of internal crystal structure of metal, and high automatic degree assuring quality and enabling semi-automatic ...