... 1.Low energy 2.Heat treatment of metal 3.simple 4:igbt power supply high frequency quenching heat treatment for steel Quenching categories1 ... accessories quenching.2, the mechanical parts of the heat treatment. Such as the various gears, sprockets, all kinds ... machine tool industry, the rail surface hardening treatment.4, pliers, wrenches, screwdrivers, hammers, axes and other heat treatment.