... heating equipment Main specifications:1. Maximum input power: 70KW2. Input voltage: three-phase380V,50or60HZ3. Oscillation frequency: 30-80KHZ4. Cooling water requirements ... frequency hardening heat treatment. For example: crank shaft, ram, piston pin, camshaft, vavle. transmission within the various gears, shifting fork, ... be from 3KG to 300KG. 70KW high frequency induction pin hardening machine