Alloy K500，Monel K500 Tube，UNS N05500，EFORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA18，American Specs:AMS 4676 Bar and Forgings QQ-N-286，German Specs:WS 2.4375

### **Alloy K-500 / Monel K-500 Tube / UNS N05500 - Age-Hardenable Nickel-Copper Alloy Tube** **Product Overview** Monel K-500 Tube (UNS N05500) represents a premium precipitation-hardenable nickel-copper alloy in tubular form, combining the exceptional corrosion resistance of Monel 400 with enhanced mechanical properties achieved through controlled age-hardening treatment. This tube product is specifically engineered for heat exchangers, condensers, instrumentation, and mechanical applications where superior strength, excellent corrosion resistance, and reliable performance in demanding environments are required. **Chemical Composition (ASTM B163 / ASTM B165)** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 63.0 min (Balance) | | **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)** | 0.25 max | | **Silicon (Si)** | 0.5 max | | **Sulfur (S)** | 0.01 max | *Precipitation hardening occurs through formation of Ni₃(Ti,Al) intermetallic compounds during aging treatment.* **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.44 g/cm³ (0.305 lb/in³) | | **Melting Range** | 1315-1350°C (2400-2460°F) | | **Electrical Resistivity** | 65.0 μΩ·cm (Annealed) | | **Thermal Conductivity** | 17.0 W/m·K (at 100°C) | | **Thermal Expansion Coefficient** | 13.9 μm/m·°C (20-100°C) | | **Modulus of Elasticity** | 179 GPa (26,000 ksi) | | **Magnetic Permeability** | <1.005 (Essentially non-magnetic) | **Mechanical Properties (After Standard Aging Treatment)** *Aging Treatment: 1100°F (593°C) for 16 hours, furnace cool* | Property | Seamless Tube | Welded Tube | |----------|---------------|-------------| | **Tensile Strength** | 895-1170 MPa (130-170 ksi) | 860-1130 MPa (125-164 ksi) | | **Yield Strength (0.2% Offset)** | 620-965 MPa (90-140 ksi) | 585-895 MPa (85-130 ksi) | | **Elongation in 2"** | 20-35% | 25-40% | | **Hardness** | 25-35 HRC | 24-32 HRC | | **Collapse Strength** | Excellent | Good | **Tube Specifications & Available Forms** **Tube Types** - Seamless Heat Exchanger Tubes (ASTM B163) - Seamless Pipe & Tube (ASTM B165) - Welded Tubes (ASTM B725) - Instrumentation Tubes - Mechanical Tubes - Hydraulic Line Tubes **Size Ranges** - **Outer Diameter**: 1/8" to 4" (3.2 mm to 101.6 mm) - **Wall Thickness**: 0.015" to 0.250" (0.38 mm to 6.35 mm) - **Length**: Up to 50 feet (15 meters) continuous length **Tolerances** - **OD Tolerance**: ±0.005" for precision tubes - **Wall Tolerance**: ±10% standard, ±5% special - **Straightness**: 0.015" per foot maximum **Key Characteristics & Advantages** 1. **Superior Corrosion Resistance**: Excellent resistance to seawater, sulfuric acid, hydrofluoric acid, and alkaline solutions 2. **Enhanced Mechanical Properties**: High strength-to-weight ratio through precipitation hardening 3. **Excellent Heat Transfer**: Good thermal conductivity combined with corrosion resistance 4. **Low Magnetic Permeability**: Essentially non-magnetic characteristics 5. **Good Fabricability**: Can be bent, expanded, and flared using standard techniques 6. **Erosion Resistance**: Superior resistance to erosion-corrosion in high-velocity fluids **Product Applications** **Heat Exchangers & Condensers** - Surface condenser tubes - Heat exchanger U-tubes - Feedwater heater tubes - Evaporator and reboller tubes **Marine & Offshore** - Saltwater cooling tubes - Hydraulic and pneumatic lines - Instrumentation tubing - Heat exchanger applications **Oil & Gas Industry** - Instrumentation and control tubing - Chemical injection lines - Well monitoring tubing - Process sampling lines **Chemical Processing** - Reactor cooling coils - Heat exchanger tubing - Process fluid transport - Analytical instrument tubing **Aerospace & Defense** - Hydraulic system tubing - Instrumentation lines - Fuel system components - Pressure sensing lines **International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | **N05500** | Unified Numbering System | | **ASTM** | B163 | Standard Specification for Seamless Condenser and Heat-Exchanger Tubes | | **ASTM** | B165 | Standard Specification for Nickel-Copper Alloy Seamless Pipe and Tube | | **ASTM** | B725/B725M | Standard Specification for Welded Nickel Alloy Tube | | **ASME** | SB163 | Boiler and Pressure Vessel Code Specification | | **ASME** | SB165 | Boiler and Pressure Vessel Code Specification | | **ASTM** | B751 | Standard Specification for Nickel Alloy Welded Tube | **Heat Treatment Specifications** - **Solution Annealing**: 1600-1650°F (870-900°C) followed by rapid cooling - **Aging Treatment**: 1100-1150°F (595-620°C) for 12-16 hours, furnace cooling - **Stress Relieving**: 1000-1100°F (540-595°C) for 1-2 hours, air cooling **Fabrication & Installation** - **Tube Expansion**: Excellent capability for roller and explosive expansion - **Tube Bending**: Good cold bending characteristics; minimum bend radius 2x OD - **Welding**: GTAW (TIG) preferred using matching filler metals - **Tube End Preparation**: Can be grooved, flared, and beaded as required **Quality Assurance & Testing** All Monel K-500 tubes supplied with comprehensive certification: - Hydrostatic or pneumatic testing - Eddy current testing - Ultrasonic examination - Dimensional verification - Mechanical testing reports - Chemical analysis certificates - Heat treatment documentation **Conclusion** Monel K-500 Tube (UNS N05500) offers an outstanding combination of high strength, excellent corrosion resistance, and superior heat transfer characteristics. Its availability in various tubular forms—from precision instrumentation tubes to heavy-walled heat exchanger tubes—makes it exceptionally versatile for critical applications across marine, chemical processing, power generation, and aerospace industries. The age-hardening capability ensures maintained performance in high-temperature and high-pressure environments, providing engineers with a reliable tubing solution for the most demanding service conditions.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1706 gallon liquid totes Special package is available on request.