Carbon ANSI Flanges 1.Features :carbon steel flange 2.Material :SS400,A105 ,Q235 etc. 3.Size:DN15-DN2000 ... . Size 1/2-78 inch (DN15-DN2000)4. Material Carbon Steel Material: A105, SS400, SF440 RST37.2,S235JRG2,P250GH,C22. ... pipe, heat exchanger, shipbuilding, construction, etc.6. Production processraw material--cutting--heating--forging--heat treatment--marching--inspection.7. Inspection factory in ...