Monel 400 Rod is a nickel-copper alloy (Ni~67%, Cu~30%) solid solution strengthened rod, and its single-phase austenite structure exhibits unique physical metallurgical properties. The alloy forms a dense crystal structure through atomic-level solid solution of nickel and copper elements, which makes it have intrinsic corrosion resistance in acidic, alkaline and salt spray environments. Its corrosion resistance mechanism originates from the passivation characteristics of nickel and the synergistic protection of copper, rather than relying on the protection of the surface oxide film.