Monel K500 Flanges (UNS N05500)
Monel K500 flanges are made from a high-strength, corrosion-resistant alloy composed primarily of nickel and copper. They are ideal for harsh environments, such as marine, chemical processing, and aerospace industries, due to their excellent resistance to seawater, acids, and alkalis. The alloy also offers good mechanical properties at both high and low temperatures. Monel K500 flanges are commonly used in applications requiring superior durability and performance in extreme conditions.
Monel K500 Specifications:
- Standard: ASTM B564, ASME SB564
- Material Grade: Monel K500 (UNS N05500)
- Flange Types: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Orifice
- Size Range: 1/2" to 48"
- Pressure Ratings: 150#, 300#, 600#, 900#, 1500#, 2500#
- Manufacturing Process: Forged, Machined, Heat Treated
Monel K500 Chemical Composition:
| Element | Composition (%) |
|---|---|
| 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 |
| Silicon (Si) | 0.5 max |
| Carbon (C) | 0.25 max |
| Sulfur (S) | 0.01 max |
Monel K500 Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | 965 MPa min |
| Yield Strength (0.2% Offset) | 690 MPa min |
| Elongation | 20% min |
| Hardness (Rockwell B) | 85 max |
Monel K500 Physical Properties:
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ |
| Melting Point | 1350 - 1370°C |
| Thermal Conductivity | 17.0 W/m.K |
| Electrical Resistivity | 0.65 μΩ·m |
Possible Alternative Grades:
| Alternative Grade | Similar Properties |
|---|---|
| Monel 400 | Lower strength, similar corrosion resistance |
| Inconel 625 | Higher strength, superior corrosion resistance |
| Hastelloy C22 | Better resistance to oxidizing environments |
Chemical Formula:
Monel K500 is primarily a nickel-copper (Ni-Cu) alloy with additions of Aluminum and Titanium for precipitation hardening.
Grade Specification Comparison:
| Specification | Equivalent Grade |
|---|---|
| ASTM B564 | Monel K500 |
| UNS | N05500 |
| DIN | 2.4375 |
Corrosion Resistance:
Monel K500 exhibits excellent corrosion resistance in:
- Marine Environments: Resists seawater, brine, and saline conditions.
- Chemical Processing: Withstands acids, alkalis, and reducing agents.
- High-Temperature Applications: Performs well in oxidation and pitting environments.
Heat Resistance:
- Good resistance to oxidation: Up to 982°C.
- Retains mechanical properties: At sub-zero temperatures.
Heat Treatment:
- Solution Annealing: 980–1050°C followed by rapid cooling.
- Age Hardening: 595–620°C to improve hardness and strength.
Welding:
- Method: Gas-Tungsten Arc Welding (GTAW), Gas-Metal Arc Welding (GMAW), Shielded Metal Arc Welding (SMAW)
- Filler Metal: Monel 60 or Nickel-Copper alloy electrodes
- Precautions: Avoid excessive heat input to prevent loss of mechanical properties.
Fabrication:
- Easily machinable using conventional methods.
- Cold working increases strength and hardness.
- Annealing is recommended after severe deformation.
Applications:
- Marine Industry: Pumps, valves, and heat exchangers.
- Aerospace: Landing gear and turbine components.
- Chemical Processing: Acid-resistant equipment and piping.
- Oil & Gas: Sour gas and offshore drilling components.
- Power Plants: Heat exchanger tubes and condenser systems.