Monel® K-500
Monel K-500 is a precipitation-hardenable nickel-copper alloy. It combines the excellent corrosion resistance characteristic of Monel 400 with the added advantages of greater strength and hardness, achieved through the addition of aluminum and titanium and a controlled heat treatment cycle.
- Common Forms: Round Bar, Shafting, Rod, Forgings, Wire.
- Key Feature: High strength (approx. 3x the yield strength of Monel 400).
- Special Property: Non-magnetic, even at temperatures as low as -200°F.
- Condition: Typically supplied in the age-hardened condition.
Select Monel K-500 when you need the corrosion resistance of the standard nickel-copper alloy but require significantly higher mechanical properties. Its unique combination of high strength, corrosion resistance, and non-magnetic properties makes it ideal for demanding applications.
High Strength & Hardness
Through age-hardening, K-500 achieves yield strengths up to 110 ksi (compared to ~30 ksi for annealed Monel 400), making it suitable for heavy-duty shafts.
Corrosion Resistance
Maintains virtually the same outstanding resistance as Monel 400 to sea water, sour gas environments, and various chemical process streams.
Non-Magnetic
Remains non-magnetic down to cryogenic temperatures, a critical property for electronic housing and specialized oilfield survey instruments.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 27.0 - 33.0 |
| Aluminum (Al) | 2.30 - 3.15 |
| Titanium (Ti) | 0.35 - 0.85 |
| Iron (Fe) | 2.0 max |
| Manganese (Mn) | 1.5 max |
| Carbon (C) | 0.18 max |
*Note: The additions of Aluminum and Titanium are what allow this alloy to be age-hardened.
| Product Form | ASTM / ASME Standards |
|---|---|
| Bar, Rod, Wire | ASTM B865, ASME SB865 (Supersedes B164 for K-500) |
| Forgings | ASTM B564, ASME SB564 |
| Pipe & Tube (Seamless) | ASTM B163 (Condenser Tubes), ASTM B165 |
Because of its exceptional strength and non-magnetic properties, we primarily supply Monel K-500 in robust product forms optimized for heavy machining in the marine, oil and gas, and chemical pump industries.
Bar, Rod & Shafting
The most popular form for K-500. Precision round bar stock used for CNC machining high-strength marine propeller shafts, pump impellers, and oil well drill collars.
Fasteners
Age-hardened bolts, studs, and nuts that offer extreme tensile strength and refuse to corrode or gall in harsh seawater and offshore environments.
Forgings
Custom forged blocks and rings designed for high-stress oil and gas valve bodies, safety lifts, and heavy-duty marine hardware.
Wire & Springs
High-strength wire utilized for manufacturing heavy-duty springs and specialized components requiring strict non-magnetic properties.
Plate & Sheet
High-strength flat rolled stock used for fabricating wear-resistant marine fixtures, scraper blades, and specialized chemical vessels.
Pipe & Tube
Seamless tubing engineered for high-pressure, corrosive downhole oilfield environments and demanding sour gas (H2S) service.
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 140 - 190 ksi (965 - 1310 MPa) |
| Yield Strength (0.2% Offset) | 100 - 160 ksi (690 - 1100 MPa) |
| Elongation | 30 - 20 % |
| Hardness (Rockwell C) | 27 - 38 HRC |
*Note: Properties shown are for material in the fully age-hardened condition, which provides maximum strength.
Marine Propeller Shafts
Used for high-performance boat shafts requiring high fatigue strength and seawater corrosion resistance.
Oil & Gas Drilling
Non-magnetic drill collars, safety lifts, and valve components for sour gas (H2S) service.
Pump & Valve Trim
Impellers, pump shafts, and valve stems handling corrosive liquids where high wear resistance is needed.
Springs & Fasteners
High-strength springs and fasteners that must operate in corrosive environments without failing.
Need High-Strength Monel K-500?
We specialize in Monel K-500 shafting and bar stock. Contact our metallurgists today for pricing and heat treatment options.
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