... energy 4:almost no oxide layer high frequency quenching heat treatment for steel Quenching categories1. All kinds of gears, sprockets, ... motorcycle 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.