Q: Is there any advantage of using a Hastelloy B3 fastener over a B2 fastener?

A: Both Hastelloy B2 and B3 fasteners provide good resistance to non-oxidizing acids, such as hydrochloric acid and sulfuric acid. The only advantages of Hastelloy B3 fasteners over B2, is that they offer enhanced thermal stability and improved fabrication characteristics. Remember, both B2 and B3 fasteners should not be used in oxidizing media or in the presence of ferric or cupric salts, as it will cause corrosion failure.