... , F44, F51, SUS304/304L, F304/304L, F321, F304H, F347 Stainless steel Blind Flanges 1. Standard: DIN, ANSI/ASME B16.5, GOST, EN1092-1 ... annual productioni comes to 5000 tons of the stainless steel flanges, duplex flange and alloy steel flange, which can be used in pharmacy, tube ...