Specs: AMS 5616
Stainless Steel 418, known as Greek Ascoloy, is a hardenable Chromium-Nickel-Tungsten martensitic stainless, intended for applications with service temperatures up to 1200°F.
418 Stainless has good resistance to scaling and oxidation at temperatures up to 1400°F. It resists atmospheric corrosion, weak organic acids and oxidizing acids. It has best corrosion resistance in the hardened and tempered condition.
Typically, Stainless 418 is used in such applications as steam turbine buckets and blades as well as compressor parts in gas turbines and high temperature bolts.