About 276|Hastelloy C-276 (57% nickel, 16% chromium, 16% molybdenum, 4% tungsten). The original “will resist almost anything” superalloy. Exceptional resistance to pitting, stress corrosion cracking, and both oxidizing and reducing chemicals. Used for chemical processing, flue gas desulfurization, pulp and paper, and pharmaceutical manufacturing. Machines like other nickel superalloys, which is to say, badly. Sharp coated carbide, rigid setup, aggressive feed, flood coolant. One of the most expensive common engineering alloys. Compare to
Alloy 22 (wider chemical resistance, newer formulation) and
625 (adequate for many of the same environments, slightly less expensive).