... , measuring tools, screwdrivers, picks, knives, scissors, gardening tools and other tools of the quenching, shaft, pin, gears, sprockets, ... ) Compared with other heating methods (such as gas, oxygen, acetylene, coking coal, electric furnace, high frequency tube etc.), ... Veryfast temperature rise, reducing the surface oxide layer and the workpiece deformation degree8 )Environmental protection ,no noise, ...