... ,ASTM B381 3.Flange surface: FF,FG,RJ etc. 1.Titanium flange Item nameTitanium flange ASME/ANSI B16.5,DIN2630~2633 ... etcMaterialGr1,Gr2,Gr5,Gr7,Gr9,Gr12Size1/2''~80''(DN10~600)Pressure rating0.6~32Mp(DIN) PN6,PN10,PN16,PN25 though PN250 ... client needs. Best price standard ANSI B16.5 Gr2 Forged Titanium flange for pressure vessel