Monel® Metal Alloys
Nickel-Copper superalloys famous for their high strength and toughness over a wide temperature range, and exceptional resistance to many corrosive environments, particularly sea water and hydrofluoric acid.
Monel 400
The standard Nickel-Copper alloy (UNS N04400). It offers great resistance to sea water and steam at high temperatures, as well as to salt and caustic solutions.
View Monel 400 Details
Monel R-405
The free-machining version of Monel 400 (UNS N04405). Controlled sulfur is added to create sulfide inclusions, which act as chip breakers during machining operations.
View Monel R-405 Details
Monel K-500
A precipitation-hardenable Nickel-Copper alloy (UNS N05500). By adding Aluminum and Titanium, it combines the corrosion resistance of 400 with 3x the yield strength and hardness.
View Monel K-500 DetailsWhy Choose Monel Alloys?
Monel alloys are unique because they contain a large amount of Copper (about 30%) in addition to Nickel (about 63%). This composition makes them superior to commercially pure Nickel in resisting corrosion by rapidly flowing brackish water or seawater.
They are also one of the few alloys that can withstand Hydrofluoric Acid, making them indispensable in the chemical processing industry.
| Alloy | Key Characteristics | Machinability | Typical Application |
|---|---|---|---|
| Monel 400 | Solid solution alloy. High strength and toughness over wide temperature range. Excellent corrosion resistance. | Good | Marine fixtures, Chemical piping, Heat exchangers. |
| Monel R-405 | Similar to 400 but with added Sulfur for enhanced machinability. | Excellent | Automatic screw machine parts, Fasteners, Valve inserts. |
| Monel K-500 | Precipitation hardenable. 3x stronger than 400. Non-magnetic down to -200°F. | Fair (Hard) | Propeller shafts, Pump shafts, Oil well drill collars. |
To conquer highly corrosive marine environments and aggressive chemical processing plants, we supply the complete Monel® alloy family in a wide range of industrial mill forms ready for fabrication:
Pipe & Tube
Seamless piping engineered to resist rapidly flowing seawater and hydrofluoric acid. Essential for offshore rigs and desalination plants.
Pipe Fittings
Corrosion-resistant elbows, tees, and reducers required to assemble durable, leak-proof chemical and marine piping systems.
Flanges
Weld neck, slip-on, and blind flanges providing exceptional resistance to pitting and stress-corrosion cracking in salt water.
Bar & Rod
Supplied in solid round and hex forms for CNC machining critical marine pump shafts, high-strength propeller shafts (K-500), and valve stems.
Plate & Sheet
Heavy plate stock utilized for fabricating durable chemical reactor vessels, heat exchanger baffles, and robust marine fixtures.
Fasteners
Bolts, nuts, and studs (often machined from free-cutting R-405) that refuse to corrode or seize in harsh offshore environments.
Can Monel be welded?
Yes, Monel 400 has excellent weldability. Monel K-500 can also be welded, but it requires post-weld heat treatment (PWHT) to restore its strength and ductility.
What is the difference between Monel 400 and K-500?
K-500 has Aluminum and Titanium added, allowing it to be heat-treated (aged) for much higher strength and hardness. Monel 400 is strictly a solid-solution alloy and cannot be hardened by heat treatment, only by cold working.
Looking for Monel Stock?
We carry a comprehensive inventory of Monel 400 piping and Monel K-500 bars.
Request a Quote