S-816

UNS R30816 cobalt
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Cobalt superalloy with high strength from 540–870 °C. One of the first cobalt alloys developed for jet engine turbine buckets. Good hot corrosion and oxidation resistance.

Applicable Standards

  • AMS 5765
  • UNS R30816

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Co 40.0 100.0 ~70.0
Cr 19.0 21.0 ~20.0
Ni 19.0 21.0 ~20.0
Fe — 4.0 ~2.0
Mo 3.5 4.5 ~4.0
W 3.5 4.5 ~4.0
Nb 3.5 4.5 ~4.0
Co 40.0–100.0% Cr 19.0–21.0% Ni 19.0–21.0% Fe 0.0–4.0% Mo 3.5–4.5% W 3.5–4.5% Nb 3.5–4.5%

Typical Applications

  • Turbine buckets
  • Stator vanes
  • Industrial gas turbines
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