... steel pipe: 5.49~7.11mml Type of pipe: round pipel Mill speed: 30~60m/min KGPS series thyristor (controllable silicon) M ... regulation on rectifying and inverting.This equipment widely apply for steel pipe seam annealing, fusion, heat penetration, quenching, brazing, siphon ... , sintering etc.Power grade: 50 kW1500kWFrequency range: 500Hz8kHz Iron steel pipe tube seam M.F. integral annealing Equipment