for long pole type, axle, ring type, flange such heat heating: such as cannon muzzles workpiece axis, turbine rotor, (1) use: for long pole type, axle, ring type, flange such heat heating: such as cannon muzzles workpiece axis, turbine rotor, Marine diesel engine, generator of quenching workpiece axis etc, normalizing, tempering etc.(2) heating mode: resistance, fuel and gas3) features:In the ...