Monel K500(alloy K500), UNS N05500 (QQ-N-286), is a precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of Monel alloy 400 with greater strength (over 2x as strong) and hardness. It also has low permeability and is nonmagnetic to temperatures as low as -150¡ãF (-101¡ãC). This alloy shows the corrosion resistant characteristics of grades such as Alloy 400 but with enhanced strength and hardness after precipitation hardening. However, it can be further strengthened by cold working before the precipitation hardening.