Monel® alloys are nickel-based alloys that contain between 29 and 33 percent copper. Initially created by metallurgist Robert Crooks Stanley and patented in 1905 by the International Nickel Company. The metal was given the name Monel in honor of the then-director of International Nickel. Not surprisingly, Stanley later became Director of International Nickel.
By 1908, Monel was being used as a roofing material for Pennsylvania Station in New York. During the 1920s and later, Monel was used for countertops, sinks, appliances, and roof flashing. While Monel was among the most popular metals on the market through the 1940s, it was largely replaced by the more versatile stainless steels from the 1950's onward.
Types of Monel
There are six types of Monel. All contain a large percentage of nickel (up to 67%), while some iron, manganese, carbon, and/or silicon. Small additions of aluminum and titanium, which form the K-500 alloy, increase strength, particularly at high temperatures, making it useful in aerospace applications.
Designation Cu % Al % Ti % Fe % Mn % Si % Ni % Monel 400 28-34 - - 2.5 max. 2.0 max. - 63 min. Monel 405 28-34 - - 2.5 max. 2.0 max. 0.5 max. 63 min. Monel K-500 27-33 2.3-3.15 0.35-0.85 2.0 max. 1.5 max. - 63 min.Source: SubsTech. Substances & Technology
Uses for Monel
Monel® alloys are most often found in chemical plant equipment due to their strong resistance to chemical corrosion. They are also used in the aerospace industry. Products built with Monel (particularly before the advent of stainless steel) include heat exchangers, screw machine products, wind instruments, piping systems, fuel and water tanks, kitchen sinks, and roofing.
Pros of Monel
Monel® alloys have a great deal to offer. Prior to the 1950s, they were the "go to" choice for many critically important industries. It could also be easily welded, soldered, and brazed. This is because of its:
Cons of Monel
While Monel has a number of advantages, it is far from the perfect metal. The machinability of these alloys is poor because of their tendency to quickly work-harden. What's more:
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