Alloy K500，Monel K500 Pipe，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 Pipe / UNS N05500 - Age-Hardenable Nickel-Copper Alloy Pipe** **Product Overview** Monel K-500 Pipe (UNS N05500) is a precipitation-hardenable nickel-copper alloy pipe that combines the excellent general corrosion resistance of Monel 400 with significantly higher strength and hardness achieved through age-hardening treatment. The pipe product form is specifically engineered for pressure applications, fluid transport, and mechanical components requiring superior mechanical properties and outstanding corrosion resistance in severe environments, particularly in marine and chemical processing services. **Chemical Composition (ASTM B165 / ASTM B725)** | 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 | *Age-hardening occurs through precipitation of Ni₃(Ti,Al) intermetallic compounds during thermal 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 (Pipe - Aged Condition)** *Aging Treatment: 1100°F (593°C) for 16 hours, furnace cool* | Property | Seamless Pipe (ASTM B165) | Welded Pipe (ASTM B725) | |----------|------------------|----------------| | **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 | **Available Pipe Specifications** **Pipe Types** - Seamless Pipe (ASTM B165) - Welded Pipe (ASTM B725) - Heat Exchanger Tubes (ASTM B163) **Size Ranges** - **Seamless Pipe**: 1/8" to 24" NPS - **Welded Pipe**: 1/8" to 48" NPS - **Wall Thickness**: Schedule 5S to XXS - **Length**: Random lengths (18-24 feet), cut to length **Key Characteristics & Advantages** 1. **Superior Corrosion Resistance**: Excellent resistance to seawater, sulfuric acid, hydrofluoric acid, and alkaline solutions 2. **Enhanced Mechanical Properties**: High strength and hardness through precipitation hardening 3. **Low Magnetic Permeability**: Essentially non-magnetic in all conditions 4. **Excellent Fatigue Strength**: Superior performance in vibrating and cyclic pressure applications 5. **Good Fabricability**: Can be welded, bent, and formed using standard techniques 6. **High Pressure Capability**: Suitable for high-pressure and high-temperature applications **Product Applications** **Marine & Offshore** - Seawater piping systems - Ballast and bilge piping - Hydraulic control lines - Heat exchanger tubes and condensers **Oil & Gas Industry** - Process piping in sour service - Instrumentation and control lines - Chemical injection lines - Wellhead component piping **Chemical Processing** - Acid and alkali transport lines - Reactor cooling coils - Distillation column piping - Heat exchanger tubing **Power Generation** - Feedwater heater tubes - Condenser tubing - Instrumentation tubing - Cooling water systems **International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | **N05500** | Unified Numbering System | | **ASTM** | B165 | Standard Specification for Nickel-Copper Alloy Seamless Pipe and Tube | | **ASTM** | B725/B725M | Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe | | **ASTM** | B163 | Standard Specification for Seamless Condenser and Heat-Exchanger Tubes | | **ASME** | SB165 | Boiler and Pressure Vessel Code Specification | | **ASME** | SB725 | Boiler and Pressure Vessel Code for Welded Pipe | | **NACE** | MR0175/ISO 15156 | Suitable for sour service applications | **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** - **Welding**: GTAW (TIG) and GMAW (MIG) using Monel 60 or Monel 67 filler metals - **Bending**: Good cold bending characteristics; hot bending recommended for tight radii - **Threading**: Can be threaded using standard techniques - **Flaring**: Excellent flaring and flanging capabilities **Quality Assurance** All Monel K-500 pipe supplied with: - Mill Test Certificates to ASTM/ASME requirements - Hydrostatic test reports - NDE reports (UT, RT, ET as specified) - Heat treatment documentation - Full material traceability **Conclusion** Monel K-500 Pipe (UNS N05500) offers an exceptional combination of high strength, excellent corrosion resistance, and reliable performance in pressure applications. Its availability in both seamless and welded forms makes it suitable for various industrial applications across marine, oil and gas, chemical processing, and power generation industries. The age-hardening capability provides designers with a piping material solution that maintains integrity in the most demanding corrosive and high-pressure environments.

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 1705 gallon liquid totes Special package is available on request.