Monel K500 Pipe Fittings
Monel K500 Pipe Fittings ( UNS N05500 )
Monel K500 Pipe Fittings are manufactured from a high-strength nickel-copper alloy that combines the excellent corrosion resistance of Monel 400 with enhanced mechanical properties due to the addition of aluminum and titanium. Through age-hardening (precipitation hardening), Monel K500 (UNS N05500) achieves exceptional strength, hardness, and toughness, making it ideal for high-stress and high-temperature industrial applications.
These fittings exhibit outstanding resistance to seawater corrosion, chemical attack, erosion, and cavitation. Monel K500 Pipe Fittings maintain their performance even in sub-zero temperatures and elevated service conditions up to 1200°F (648°C). Their superior durability, combined with excellent weldability and formability, makes them a preferred choice in offshore engineering, chemical processing, pump shafts, valves, and petrochemical applications.
Key Features
Stronger than Monel 400 due to precipitation hardening
Outstanding corrosion resistance in seawater & marine environments
Excellent resistance to acids, alkalis & chemical attack
Superior mechanical strength, fatigue resistance, and toughness
Non-magnetic even at low temperatures
Excellent resistance to cavitation & erosion
High-temperature stability up to 648°C
Long-lasting performance in aggressive environments
Specification
| Specifications | Details |
|---|---|
| Standard | ASTM B366, ASME SB366 |
| Grade | Monel K500 |
| UNS Number | N05500 |
| WNR Number | 2.4375 |
| Dimensions | ASME B16.9, B16.28, MSS SP-43 |
| Size Range | ½” to 24” NB |
| Type | Seamless, Welded, Fabricated |
| Schedule | Sch 5S – XXS |
| Manufacturing | Hot-formed / Cold-formed / Age Hardened |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N05500 |
| WNR | 2.4375 |
| BS | NA 18 |
| JIS | NW 5500 |
| AFNOR | NU-30MD |
| ASTM | Monel K500 |
Available Sizes
Pipe Fittings Size: ½” – 24” NB
Thickness: Sch 5S, 10S, 40S, 80S, 160, XXS
Forms: Seamless, Welded, ERW, Fabricated
Custom-built fittings available on request
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 27.0 – 33.0 |
| Aluminum (Al) | 2.3 – 3.15 |
| Titanium (Ti) | 0.35 – 0.85 |
| Iron (Fe) | 2.0 max |
| Manganese (Mn) | 1.5 max |
| Carbon (C) | 0.25 max |
| Silicon (Si) | 0.50 max |
| Sulfur (S) | 0.010 max |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 965 MPa min |
| Yield Strength | 690 MPa min |
| Elongation | 20% min |
| Hardness (Age Hardened) | Rockwell C 35 max |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ |
| Melting Range | 1315 – 1350°C |
| Electrical Resistivity | 0.55 µΩ·m |
| Thermal Conductivity | 17.0 W/m·K |
| Modulus of Elasticity | 179 GPa |
| Specific Heat | 427 J/kg·K |
| Magnetic Permeability | Essentially non-magnetic |
Types of Monel K500 Pipe Fittings
Monel K500 45°, 90°, 180° Elbows
Long Radius & Short Radius Elbows
Equal Tee & Reducing Tee
Concentric & Eccentric Reducers
Monel K500 Pipe Cap
Cross Fittings
Short Stub Ends & Long Stub Ends
Seamless Monel K500 Pipe Fittings
Welded & Fabricated Monel K500 Fittings
Corrosion Resistance
Monel K500 provides excellent resistance against:
Seawater, saltwater & marine environments
Stress corrosion cracking in most environments
Non-oxidizing acids & alkalis
Erosion and cavitation
Hydrofluoric & sulfuric acids (under controlled conditions)
Sour gas environments (H₂S)
It offers improved resistance to cavitation corrosion compared to Monel 400.
Heat Resistance
Suitable for service temperatures up to 1200°F (648°C)
Maintains strength at elevated temperatures
Outstanding oxidation resistance
Performs well in cryogenic (-200°C) conditions
Heat Treatment
Monel K500 undergoes precipitation hardening:
Solution Annealing: 980°C
Quenching: Rapid cool
Age Hardening: 595°C – 605°C
Welding
Monel K500 can be welded using:
TIG (GTAW)
MIG (GMAW)
SMAW
Important Notes:
Prevent excessive heat input
Welds are not age-hardenable
Use suitable filler metal such as ENiCu-7 (Monel 400 filler)
Post-weld stress relief may be required for critical components
Fabrication
Hot worked
Cold worked
CNC machined
Forged
Deep drawn
Precision formed
Applications
Marine & Offshore Engineering
Oil & Gas (Sour Gas Service)
Petrochemical & Refinery Units
Chemical Processing Plants
Pump Shafts & Valve Components
Heat Exchangers & Condensers
Power Generation
Aerospace Components
Fasteners and Springs
Desalination Plants