Monel Alloy 400, Monel Alloy
K-500, and Inconel 625 & 718 are high nickel alloys with distinguishing characteristics of strength, hardness and corrosion resistance which have been developed for special applications. Monel Alloy 400 is approximately 2/3 nickel and 1/3 copper; Monel Alloy K-500 is similar except that it has about 3% aluminum; Inconel contains about 50-71% nickel, 17-23% chromium, and 5-17% iron.
The distinguishing characteristics of these materials are their exceptional qualities of strength, versatility and resistance to heat and corrosion.
Monel Alloy 400 is the Nickel Alloy most commonly used for fastenings because it combines these qualities with relative economy and good adaptability to cold heading and roll threading processes. Monel Alloy K-500 is heat treatable and is, in effect, a high strength version of Monel Alloy 400.
Inconel is an outstanding material for applications where fastenings must retain high strength and resistance to oxidation at extremely high temperatures ranging up to 1600o F.
Monel Alloy 400 has wide use in chemical, mechanical and electrical equipment, marine and building construction and for appearance uses. Monel Alloy K-500 finds use in marine applications, among others, where high strength is required, as in submarines. Inconel is found in tanks, nuclear reactors, pumps and valves, coils, coolers, racks, evaporators, and pipe lines, where toughness and immunity to discoloration, corrosion and heating/cooling cycles is required.