... annealing furnace is applied for seam annealing, fusion, heat penetration, quenching, brazing, siphon, sintering steel pipe seam annealing furnace ... .This equipment widely apply for steel pipe seam annealing, fusion, heat penetration, ... quenching, brazing, siphon, sintering etc.Power grade: 50 kW~1500kWFrequency range: 500Hz~8kHz steel pipe seam annealing furnace ...