... neck flanges ,socket welding flanges ,blind flanges and so on Materials, Grades (stainless steel) Available:EN10222-5/DIN17440: 1.4301, 1.4306/1.4307, 1 ... .4401, 1.4404 and 1.4541, 1.4571 etc.ASTM SA/A182 F304, F304L ... / Lap Joint FlangeANSI B16.47 Series A/B Blind/Weld Neck Flanges2) DIN 2527 (PN6, PN10, PN16 PN25, PN40, PN64, ...