... controlled adjustable heating, insulating power and time, will help provide high quality of the repetitive heating and simplify workers to operate;Heat ... hardening heat treatment. For example: crank shaft, ram, piston pin, camshaft, vavle. transmission within the various gears, shifting fork, spline ... . 2. Melting capacity can be from 3KG to 300KG. 70KW high frequency induction pin hardening machine