Our diameter:219.1mm-3040mm(8-120 inch) Wall Thickness:5 -30mm Length:4-22m Steel Grade:API 5L GR.B,X42,X46,X56,X65,X70 ASTM A53 GRADE A,GRADE B EN:S275,S275JR,S355JRH,S355J2H Surface:Fusion Bond Epoxy Coating,Coal Tar Epoxy,3PE,Varnish coating,Bitumen coating,Black Oil coating as per customers requirement Test:Chemical Component Analysis,Mechanical Properties(Utimate Tensile Strength,Yield Strength,Elongation),Technical Properties(Flattening Test,Bending Test,Blow Test,Impact Test),Exterior Size Inspection,Hydrostatic Test.,X-ray test Mill Test Certificate:EN10204/3.1B