What is N05500? Nickel Alloys

N05500 is the Unified Numbering System (UNS) designation for a nickel-based alloy most commonly known as Monel K500. The UNS system was created by a number of trade groups working together in the 1970’s, to reduce confusion from the same alloy being called different things or vice-versa. Each metal is indicated by a letter followed by five numbers, where the letter indicates the family of metals i.e. N for nickel-based alloys.

Monel K500 is almost entirely made up from nickel (>63%) and copper (28-34%). It is particularly resistant to seawater corrosion, as a complex but thin, adherent protective surface film forms very quickly when exposed to clean seawater. This protective film will protect the alloy in most circumstances, the only exceptions being where there is very slow flow rates that might support fouling. As well as seawater, Monel K500 is also resistant to corrosion in other chloride solutions, and a range of acids including sulphuric acid. It is resistant to hydrofluoric and hydrochloric acid as long as the solutions contain minimum oxygen content i.e. in reducing conditions. It is used is a wide variety of marine and chemical engineering applications that predominantly exploit its excellent corrosion resistance.

The high strength of Monel K500 means that it can be used effectively in more challenging components, such as marine shafts, valve stems, fasteners, mixer and agitator shafts and doctor blades, drill collars and heat exchanger components.

Monel is a registered trademark of Special Metals Corporation.

Langley Alloys carries a significant stock of Alloy K500 solid bar, from 5/8″ (15.875mm) up to 10″ (254mm) in a large number of incremental sizes.


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For more information about nickel based alloys, please don’t hesitate to contact us today. We would be happy to answer any questions that you may have regarding specifications and common applications.