Standard:GB3091-2015,BS1387-1985,ASTM A500 GRADE A,B,C, Grade Q235B,Q345B,SS400, S235JR ASTM A500 GRADE A,B,C Thickness 2.0mm-10.0mm Section Shape :Circular Place of Origin Hebei  Province Outer Diameter 21.3mm-219mm TechniqueERW Certification ISO CE SRIM Application GAS TRANSFER,fire-fighting water transfer Surface Treatment :hot dipped galvanized/ OILED / BLACK PAINTING /lacquer End finished:  BS / ANSI /GB standard threaded with or without couple Packaging&Deliver Packaging Details: BulkBundle Delivery Detail:  bulk or container
