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China Factory Large Diameter Spiral Welded Black Mild Carbon Steel Tube Round Square Rectangle SSAW API 5L Galvanized Stainless Steel ERW Welded Steel Pipe, Find Details and Price about Steel Pipe Seamless Steel Pipe from China Factory Large Diameter Spiral Welded Black Mild Carbon Steel Tube Round Square Rectangle SSAW API 5L Galvanized Stainless Steel ERW Welded Steel Pipe - Cangzhou Chengsheng Pipeline Equipment Co., Ltd.