These are of Carbon Steel conforming to ASTM A-105 & IS2062, Alloy Steel to ASTM A-182 Gr. F-5, F-11 & F-22, low temperature Carbon Steel to ASTM A-350 Gr. LF-2,Stainless Steel conforming to ASTM A 182 Gr. F-304, F-304L, F-316, F-316L, F-321, F-347 & Monel K 400. Flanges are manufactured as per ANSI B 16.5, BS 4504, BS 1560, BS 10, IS 6392 & DIN Specifications in Sizes 1/2" to 48”.