carbon steel ring 4" A105 the flanges we supplied enjoy great reprtation in abroad market with high quality and competitive pri carbon steel ring 4" A105 Materialcarbon steel(A105,Q235,A350),alloy steel(F5,F9,F11),stainless steel (304,316);Size from 1/2"to64"standard ANSI,JIS,DIN,ASME,BS,ENtypeWN,PL,SW,BL,SO,TH,LJpaintingblack,yellow, galvanizing,antirusting oil;packing plywood case, pallet; ...