Hastelloy B-2 Tube Hastelloy B-2 alloy has excellent corrosion resistance in various reducing media, and can resist corrosion at any temperature and any concentration of hydrochloric acid under atmospheric pressure. It has excellent corrosion resistance in non-oxidizing sulfuric acid at medium concentrations of non-aerated sulfuric acid, various concentrations of phosphoric acid, high-temperature acetic acid, formic acid and other organic acids, bromic acid and hydrogen chloride gas, and it is also resistant to corrosion of halogen catalysts. Therefore, Hastelloy B-2 alloy is usually used in a variety of demanding petroleum and chemical processes, such as distillation and concentration of hydrochloric acid; Alkylation of ethylbenzene and low-pressure carbonyl synthesis of acetic acid and other production processes.