... the heating process for stainless steel tube, cramp iron, epoxy powder coating for steel tube, the hardening for the high tensile ... 4.Hardware: the pre-forging for screws and nuts, silver soldering for lathe tool, the soldering for air gauge, the temper ... the hardening of surface for high tensile screw, epoxy powder coating for locking nut etc. IGBT magnetic Induction stove for macine parts forging