Hastelloy G-30

Hastelloy G-30 also referred to as the UNS N06030/W.Nr. 2.4603
alloy. Alloy G-30 is a nickel-chromium-iron material highly resistant to “wet process” phosphoric acid.

P2O5 is one of the most important industrial chemicals, being the primary source of phosphorus for agrichemical fertilizers. G-30 alloy is also moderately resistant to chloride-induced localized attack, which can be a problem beneath deposits in the evaporators used to concentrate P2O5. Furthermore, G-30 alloy is less susceptible to chloride-induced stress corrosion cracking than the stainless steels.

As a result of its high chromium content, G-30 alloy is also very resistant to other oxidizing acids, such as nitric, and mixtures containing nitric acid. It possesses moderate resistance to reducing acids, such as hydrochloric and sulfuric, as a result of its appreciable molybdenum and copper contents.

Hastelloy G-30 alloy is available in the form of plates, sheets, strips, billets, bars, wires, pipes, tubes, and covered electrodes. Applications include P2O5 evaporator tubes and nitric acid-based, metal pickling hardware.