... machine for pipe and tube, IGBT design, used for pipe and tube induction heating, annealing. 160KW Induction heating for pipe and tube 1.Technical ... , over voltage, water failure, phase failure and unfit lad and so on, machine can be protected from ... 3, metal quenching, annealing, quenching, tempering and heat treatment.4, metal forging, hot forming.5, powder metallurgy sintering, and metal smelting. ...