... 4. High efficiency, energy saving is very clear, high-frequency devices than the traditional 60% saving Very even heating, ... power3kw-30kw Applications: 1,Avariety of steam, Motorcycle high-frequency hardening heat treatment, such as: crankshaft, connecting rod, ... of spline shaft, drive axle, various small shaft crank pin, a variety of rocker, rocker shaft, high-frequency hardening heat treatment ...