... accessories high-frequency hardening heat treatment. For example: crank shaft, ram, piston pin, camshaft, vavle. transmission within the ... hydranlic components: for example:the plunger, rotor, reversing shaft in vavle,gear high-frequency hardening machine.all kinds ... induction melting machines are mainly used for the melting of steel, stainless steel, copper, brass, silver, gold, and aluminium materials ...