AMS 5845 is a sub-type specification of Cobalt M35N, a Multiphase cobalt-based alloy with a high percentage of nickel, chromium, and molybdenum. This specification is already heat-treated, cold-worked, and age-hardened for ultra-high-tensile strength of up to 300 ksi (2070 mPa). AMS 5845 can be used in the fully-hardened condition at service temperatures up to 750° F (400° C).
Tech Steel & Materials offers AMS 5845 as a bar. The bars are produced using vacuum induction melting and consumable vacuum arc re-melting methods. The material is then solution heat-treated at 1900° F to 1925° F and aged for 4 to 8 hours.
The bars are then strengthened using the cold-working method. Finally, the bars are aged again at 1000° F to 1200° F (540° C to 650° C) for 4 hours, unlike the AMS 5844 specification which only comes in the cold-worked form. Cold-working, followed by aging, produces the highest tensile strengths, but slightly reduces sulfide resistance.
AMS 5845 possesses ultra-high-strength, combined with excellent stress corrosion cracking resistance and crevice corrosion resistance. These qualities make it an excellent choice for use in harsh environments in many fields, such as Aircraft and Aerospace industries, Oil & Gas Industry, Chemical Industry, and Marine Industry.