... Neck Flange 1.Material :SS400,A105 ,Q235 ect. 2.Size:DN15-DN2000 3.Standard:ANSI,ASTM,MSS,JIS,DIN,EN HY carbon steel ... Welding Neck Flange We started to product flanges from 1986.With the ... -DN2000)4. MaterialCarbon Steel Material: A105,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8 ect.5. Used forpetroleum, chemical, power, gas, water ...