ASME/ANSI B16.9 fittings standard specification are cover only the butt weld fittings. That are followed to connect pipes with other fittings components in industrial piping systems. These fittings are made from a wide variety of materials, like carbon steel, stainless steel, alloy steels, nickel alloys, and titanium for high-temperature applications. The specifications set out by ASM... https://www.growmechanical.com/asme-ansi-b16-9-elbow-dimensions-chart/