2.4683 / Alloy 188 / Haynes 188 is a cobalt-nickel-chromium-tungsten alloy with excellent resistance to oxidizing environments up to 1095 ° C with excellent high temperature resistance for long-term use and excellent resistance to hot corrosion of sulphate deposit. It is easily manufactured with conventional techniques. Other important properties include excellent resistance to molten chloride salts and good resistance to gaseous sulfidation. Also called UNS R30188, this cobalt-based superalloy has good forming and welding properties. As a result of its good ductility, the material 2.4683 / Alloy 188 / Haynes 188 is also easily formed by cold working. The alloy hardens by machining quickly, so frequent intermediate annealing operations may be required for complex component forming processes. All hot or cold worked parts must be annealed and rapidly cooled to achieve balance. The alloy can be welded by both manual and automatic welding methods. 2.4683 / Alloy 188 / Haynes 188 is normally solution heat treated at 1163-1191 ° C and rapidly cooled or water quenched for optimum properties. Annealing at temperatures lower than the solution heat treatment temperature will produce some carbide precipitation that can affect the properties of the material.
2.4683 / Alloy 188 / Haynes 188 has properties suitable for a variety of fabrication component applications in the aerospace industry. It is widely used in built-in military and commercial gas turbine engines for combustion boxes, transition ducts and afterburner components. It is also used in applications in new engine programs.
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