... .4539, F44, F51, SUS304/304L, F304/304L, F321, F304H, F347 Stainless steel Blind Flanges 1. Standard: DIN, ANSI/ASME B16.5 ... flange. Our annual productioni comes to 5000 tons of the stainless steel flanges, duplex flange and alloy steel flange, which can ... , pipe industry, oil and gas industry, space, machinery accessory etc... Stainless steel Blind Flanges