1)Standard:ANSI,DIN,JIS,BS,GB 2)Type:slip on,thread,socket weld,blind 3)Material:A105,A182,Q235,A3,20# ... 4)Size:DN15-DN1000 Forged Process,all kind of flanges ... , A182, Q235,A3,20#,16Mn,0Cr18Ni9,1Cr18Ni9Ti and so on.Type:SOP,SOH,WELDING NECK,SLIP ON,BLIND Rf and So ...