... Q235B, A105,16Mn, 316L 20#; Stainless steel; Alloy steel pipe joint Flanges of welding neck, socket welding, threaded, blind, slip ... on, lap joint are in accordance with ANSI B 16.5 from 1 ... RST37.2,S235JRG2,P250GH,C22.85. Surface TreatmentAnti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,6. ... .Supply Capacity: 10000tons per year High quality pipe joint