★ Monel 400, K-500
Monel 400 is in a large amount of versatile, good performance, high corrosion resistance of nickel-copper alloy. Mainly by the chemical composition and Cu30% Ni65% or so, plus a small amount of Fe (1-2%) of the composition, also known as MCu-28-1.5-1.8. Organizational structure for the single-phase austenite.

Corrosion resistance of Monel capacity generally superior than the nickel-copper, which are more resistant than the pure nickel reductive medium corrosion, oxidation resistance than the copper corrosion medium of sulfuric acid, phosphoric acid, and carbon corrosion resistance is very good, particularly resistant to hydrochloric acid corrosion of hot concentrated alkali has excellent corrosion resistance.