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China Products/Suppliers. ASTM A36 A53 A192 Q235 Q235B 1045 4130 Sch40 10mm 60mm Hot Rolled Welded or Seamless Round Carbon Steel Pipe for Oil and Gas Pipeline, Find Details and Price about Steel Pipe Seamless Steel Pipe from China Products/Suppliers. ASTM A36 A53 A192 Q235 Q235B 1045 4130 Sch40 10mm 60mm Hot Rolled Welded or Seamless Round Carbon Steel Pipe for Oil and Gas Pipeline - Cangzhou Chengsheng Pipeline Equipment Co., Ltd.