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Carbon Steel Seamless Pipe API 5L ASTM A106 A53 Gr. B Sch40 Black Steel Tube for Gas Oil Pipeline, Find Details and Price about Seamless Steel Pipe Carbon Steel Pipe from Carbon Steel Seamless Pipe API 5L ASTM A106 A53 Gr. B Sch40 Black Steel Tube for Gas Oil Pipeline - Yangtze Steel Group (China) Co., Ltd.