structural steel pipe with ASTM A106 GradeB 1.standard: ASTM JIS API ... B,X42,X46,X52,X56,X60,X70,X80.......Thickness2.11 - 100 mmSection ShapeRoundOuter Diameter21.3~1219.2mmPlace of OriginShandong, China ( ... petroleum and natural gasTechniqueHot Rolled CertificationAPISurface TreatmentBlack paint,varnishi coating,galvanized,cooper coated or as your requirementSpecial PipeAPI PipeAlloy Or NotNon ...