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API 5L ASTM A53 A106 Gr. B Psl1 Psl2 A179 A192 A333 X52 X56 X60 X70 Round Seamless Carbon Steel Pipe, Find Details and Price about Carbon Steel Pipe Seamless Steel Tube from API 5L ASTM A53 A106 Gr. B Psl1 Psl2 A179 A192 A333 X52 X56 X60 X70 Round Seamless Carbon Steel Pipe - TIANJIN BOER KING STEEL CO., LIMITED