... , welding, brazing. 1,Avariety of steam, Motorcycle high-frequency hardening heat treatment, such as: crankshaft, connecting rod, piston pin, camshaft, ... pump high frequency quenching. 4,Various electric tools gear shaft of the high-frequency hardening heat treatment. 5,A variety of ... recommendedStandard hot forging quenching Temperature protection50 degrees hot sell electric heat treatment furnace