... welding, brazing. 1,Avariety of steam, Motorcycle high-frequency hardening heat treatment, such as: crankshaft, connecting rod, piston pin, camshaft, ... rocker, rocker shaft, high-frequency hardening heat treatment. 2,The hardware high-frequency hardening heat treatment, such as pliers, hammers, strong pliers ... forging quenching Temperature protection50 degrees hot sell electric heat treatment furnace