... 2.Material :SS400,A105 ,Q235 etc. 3.Size:DN15-DN2000 Carbon ANSI Flanges 1. Standard ANSI,ASTM,JIS,DIN,GB etc ... 3. Size 1/2-78 inch (DN15-DN2000)4. Material Carbon Steel Material: A105, SS400, SF440 RST37.2,S235JRG2,P250GH,C22 ... .8 etc.5. Used forPetroleum, chemical, power, gas, water, line pipe, heat exchanger, shipbuilding, construction, etc.6. Production processraw material--cutting ...