... steel 3.Standard: ANSI, JIS, DIN, UNI, Carbon steel flanges weld neckANSI B16.5 FlangesWe are Factory Outlet & Offer OEM Service ... ,UNI,GOST12820-805.Types: plate, slip on, welding neck, blind, thread, socket weld flange6.Process: free forging, plate cutting, heat treat, ... :Carbon Steel:A105,SS400,SF440,RST37.2,S235,C22.8 Stainless Steel:F304,F304L,F316,F316L,316Ti etc Carbon Steel Flanges weld neck