Aluminium Forged Fittings, also referred to as Carpenter 20, is a nickel-iron-chromium-based alloy with additions of copper and molybdenum to improve corrosion resistance in chemical and acid environments. It is particularly ideal for use with sulfuric acid and other aggressive chemicals, thus being used in various applications in chemical processing, pharmaceuticals, food processing,... https://www.globalsteelindustries.com/aluminium-manufacturers-suppliers-stockists-exporters.html