... frequency heating quenching furnace for auto parts shaft Heat treatmentVarious kind of automobile parts, motorcycle parts, hardware tools, gears, chain ... bit, saw teeth, steel pipe, copper pipes, braze welding. SmeltingGold, silver, copper, aluminous and other metal smelting,. ... Machine Tool, etc. quenching;5, various hardware metal parts, machining parts. Such as shaft, gear (sprocket), cam, clamps, ...