... steel: Q235B, A105,16Mn, 316L 20#; Stainless steel; Alloy steel pad flange Flanges of welding neck, socket welding, threaded, blind, slip ... ,P250GH,C22.85. Surface TreatmentAnti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,6. Inspection:factory in-house self check ... time:Within 30days for 1000tons10.Supply Capacity: 10000tons per year High quality pad flange