... /GOSTMaterialCarbon Steel: A105Connectionbutt-weldingApplication rangeOil, Chemical, industry, water conservancy ,electric power ,boiler, machinery, metallurgy, etc.QualityISO9001, CRN in CanadaPackagingWooden or Plywood ... to establishing business relationships with you 6" ASTM A105 CL150 RF ASME B16.5 BLIND FLANGE