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High-frequency straight seam welded pipe device is a specification of the steel must be fed into the machine, by forming rollers for the steel belt and curl into the tube, then use high frequency proximity effect skin effect and make the tube quickly heated to welding temperature and roll extrusion welding under pressure, cooling, sizing and specifications required for rough straightening as steel pipes. Produced by roll forming machine, FFX forming machine, roll forming machine production X80 J55 grade API casing, oil and gas pipe, in line with the API-5L,API-5CT standard. The unit can also be power plants, steel mills using a special shaped tubes for condensers air cooled island.