... and 4 tons induction furnaces; electric arc furnace of 10t ,refining furnace vacuum furnace, electric slag furnaces of 0.3 ... 1t, 3t, 5t, especially 3 and 5 tons electric slag furnaces which feature both unipolar and bipolar series functions ... , reheating furnace, gas annealing furnace, electric annealing furnace, electric-hydraulic grinding machine, electric band saw and gantry saw,etc. Inspection ...