What is Alloy 188 per AMS 5608?

AMS 5608 is a specification for 188, a Cobalt based high strength corrosion and heat resistant alloy. Primary constituents are Cobalt, Nickel, Chromium, and Tungsten. UNS designation for this alloy is R30188. It is used in applications that require corrosion resistance and high strength at temperatures as high as 1800 deg F. It is oxidation resistant up to 2000 deg F
A solid solution alloy, it cannot be further strengthened by heat treatment. Cold work followed by aging can increase strength. Product to this specification is in the form of Sheet, Strip, and Plate in the solution treated
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