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Spiral welded steel pipe is a electric arc furnace routed coiled flat sheet that is wrapped in a spiral shape and brought into a pipe form and joined the band edges from inside and outside by submerged arc welding method. Spiral submerged arc welded steel pipe is formed by spiral bending of hot-rolled strip steel, and spiral seam steel pipe (also called spiral welded pipe, spiral pipe, spiral steel pipe) is formed by automatic welding of submerged arc for inner and outer joints. It can be widely used in the production of large diameter steel pipes