Monel® Nickel Alloys

Uncategorised / Thursday, September 1st, 2016

monel suppliers monel 400 monel k500 monel 405 monel 404

Monel® metals, a family of nickel-copper alloys, are used for everything from guitar strings and valve pistons on high-quality musical instruments to aircraft construction and aviation safety wiring.

We can supply stocks of all grades of Monel® products, including (but not limited to):

Monel® 400

Monel® K-500

Monel® R-405

Monel® 404

Monel® 60 (filler metal)

Monel® 401

Monel® 67 (filler metal)


We are suppliers of Monel® sheet, plate, tube / pipe, round bar, wire and fittings.  With our vast processing and machining services, we can supply small or large orders cut to size and finished as required. Please call us today on 0800 0217010 for more information or to get a quote. Alternatively, please email

Composition and uses of Monel® metal

A trademark of Special Metals Corporation, along with nickel and copper, Monel® contains small amounts of iron, manganese, carbon, and silicon. It carries high tensile strength and strong resistance to corrosion. Its use is generally limited to applications where there are no cheaper alternatives because, compared to carbon steel, Monel® can cost over 3 times as much (and 5 to 10 times more than copper and nickel).

Oil production and refining

Within the oil industry, Monel® is used in direct contact with concentrated hydrofluoric acid. Monel® offers exceptional resistance to hydrofluoric acid in all concentrations up to the boiling point. It is arguably the most resistant of all the commonly used engineering alloys and has a resistance to many forms of sulphuric and hydrochloric acids under reducing conditions. Monel® K-500 is often used in oil and gas production safety lifts and valves as well as oil-well tools and instruments, such as drill collars, whilst Monel® 400 is employed in crude petroleum stills and crude oil distillation towers.


Considered similar to steel in a number of ways, Monel® has a high resistance to weight-bearing stress (known as tensile strength) and can be welded easily. Aircraft have Monel® in their exhaust manifolds, carburettor valves and sleeves, as well as the gears and chains that control landing gear. In the 1960s, Monel® metal found bulk uses in aircraft construction, especially in making the frames and skins of experimental rocket planes, such as the United States’ X-15, to resist the great heat generated by aerodynamic friction during immensely high-speed flight. Monel® metal retains its strength at very high temperatures, allowing it to maintain its shape at high atmospheric flight speeds, a trade off against the increased weight of the parts due to Monel®’s high density.

Monel® is also used for safety wiring in the aircraft maintenance in high-temperature areas to ensure that fasteners cannot come undone, while stainless wire is used in other areas for its lower cost.

Marine applications

Monel® 400 is also often used for the high tolerance tubing. It exhibits excellent weldability, and it is often found in marine applications such as seawater valves and pump shafts (these tubes can also be found in chemical plant equipment, boiler feeders, and heat exchangers). Monel®’s corrosion resistance makes it ideal in applications such as piping systems, pump shafts, seawater valves, trolling wire, and strainer baskets. The combination of very low corrosion rates in high-velocity sear water and high strength make Monel® K-500 particularly suitable for centrifugal pump shafts in marine applications. Monel® is used for water and fuel tanks as well as numerous other underwater applications. It is also used for propeller shafts and for keel bolts.



Monel® use within the chemical industry is widespread due to the high resistance against corrosion by acids and oxygen. Even corrosive fluorides can be handled within Monel® apparatus. Another example of its usage is in regulators for reactive cylinder gases like hydrogen chloride, where PTFE is not appropriate because of the high delivery pressures required. This will sometimes include a Monel® manifold and taps in line before the regulator that allow the regulator to be flushed with a dry, inert gas after use to add further protection to the system.


For information and downloadable data sheets for all Monel® alloys, visit the Special Metals website  here.