The industry standard for pipeline flanges and fittings. B16.1, B16.5, and B16.47 are the most recognized standards nationwide.
Deutsches Institut fur Normung developed a metric standard for flanges and fittings which are most commonly used as an ANSI equivalent for Europe, as well as pressure vessels being sent to foreign markets.
American Petroleum Institute flanges and fittings are reference under API 6A and utilized for high pressure oilfield applications.
A Japanese specification for materials utilized almost exclusively in Japan, but often found in maritime vessels world wide.
The American Water Works Association specification C207 provides flanges mostly of the plate variety and for use in low pressure and low temperature applications
Low Temp Carbon Steel
ASME/ASTM SA/A350 LF1/2/3/6
ASME/ASTM SA/A182F1, F2, F5, F9, F11, F12, F22, F91
ASME/ASTM SA/A182F304/304L, 316/316L, 317/317L, 321/321H,347/347H,310
Duplex / Super Duplex
UNS S31803, S32750, S32760, S32205, S31254 ASME/ASTM SA/A182 F51, F53, F55, F60, F44
ASME/ASTM SB/B564, UNS2200 (Nickel 200)
UNS2201 (Nickel 201), UNS4400 (Monel 400)
UNS5500 (Monel K500), UNS6600 (Inconel 600)
UNS6601 (Inconel 601), UNS6625 (Inconel 625)
UNS8810/8811 (Incoloy 800H/HT), UNS8825 (Inconel 825)
UNS10276 (Hastelloy C-276), UNS6622 (Hastelloy C-22)