Alloy K500，Monel K500 Fittings，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 Fittings / UNS N05500 – Age-Hardenable Nickel-Copper Alloy Fittings** **Product Overview** Monel K-500 Fittings (UNS N05500) are precision-engineered pipe and tube connectors made from a precipitation-hardenable nickel-copper alloy. These fittings combine the excellent corrosion resistance of Monel 400 with significantly higher strength and hardness achieved through specialized age-hardening heat treatment. Designed for critical piping systems in aggressive environments, they provide reliable performance in marine, chemical processing, oil and gas, and other demanding applications where corrosion resistance and mechanical strength are paramount. --- **Chemical Composition (ASTM B366 / ASTM B564)** | 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 | *Enhanced mechanical properties are achieved through precipitation of Ni₃(Ti,Al) intermetallic phases during aging heat treatment.* --- **Physical Properties** | Property | Value | |-------------------------------|---------------------------------| | **Density** | 8.44 g/cm³ (0.305 lb/in³) | | **Melting Range** | 1315–1350°C (2400–2460°F) | | **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 (Fittings – Aged Condition)** *Standard Aging Treatment: 1100°F (593°C) for 16 hours, furnace cool* | Property | Typical Values for Aged Fittings | |-----------------------------|----------------------------------| | **Tensile Strength** | 965–1170 MPa (140–170 ksi) | | **Yield Strength (0.2% Offset)** | 655–965 MPa (95–140 ksi) | | **Elongation** | 20–30% | | **Hardness** | 25–35 HRC | | **Impact Toughness** | 40–70 J (Charpy V-Notch) | --- **Available Fitting Types & Specifications** **Fitting Types** - **Butt-Weld Fittings**: Elbows, tees, reducers, caps - **Socket-Weld Fittings**: Unions, elbows, tees, couplings - **Threaded Fittings**: Nipples, couplings, elbows, tees - **Flanges**: Slip-on, weld neck, blind, socket weld - **Special Fittings**: Instrumentation fittings, hydraulic connectors **Size Ranges** - **Butt-Weld Fittings**: 1/8" to 24" NPS - **Socket-Weld Fittings**: 1/8" to 2" NPS - **Threaded Fittings**: 1/8" to 4" NPS - **Flanges**: 1/2" to 24" NPS - **Pressure Ratings**: 150# to 2500# **Standards Compliance** - ASME B16.9 – Factory-Made Wrought Butt-Welding Fittings - ASME B16.11 – Socket-Welding and Threaded Fittings - ASME B16.5 – Pipe Flanges and Flanged Fittings - MSS-SP-97 – Socket-Weld and Threaded Fittings --- **Key Characteristics & Advantages** 1. **Exceptional Corrosion Resistance** – Superior performance in seawater, sulfuric acid, hydrofluoric acid, and alkaline environments 2. **High Strength & Hardness** – Enhanced mechanical properties through precipitation hardening 3. **Excellent Erosion Resistance** – Withstands high-velocity fluids and abrasive media 4. **Non-Magnetic Properties** – Suitable for sensitive instrumentation and marine applications 5. **Good Weldability** – Can be welded using matching filler metals with proper procedures 6. **Long Service Life** – Maintains integrity in corrosive and high-stress applications --- **Product Applications** **Marine & Offshore** - Seawater piping systems - Ballast and bilge systems - Hydraulic control systems - Shipboard chemical handling systems **Chemical Processing** - Acid and alkali transport systems - Reactor feed and discharge lines - Heat exchanger connections - Process instrumentation lines **Oil & Gas Industry** - Production piping systems - Chemical injection systems - Instrumentation and control lines - Wellhead component connections **Power Generation** - Condenser and heat exchanger connections - Feedwater system components - Cooling water system fittings - Instrumentation tubing connectors **Aerospace & Defense** - Hydraulic system components - Fuel system fittings - Instrumentation connectors - Specialized fluid handling systems --- **International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | **N05500** | Unified Numbering System | | **ASTM** | B366 | Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings | | **ASTM** | B564 | Standard Specification for Nickel Alloy Forgings | | **ASME** | SB366 | Boiler and Pressure Vessel Code – Fittings | | **ASME** | SB564 | Boiler and Pressure Vessel Code – Forgings | | **MSS** | SP-97 | Integrally Reinforced Forged Branch Outlet Fittings | | **NACE** | MR0175/ISO 15156 | Suitable for sour service applications | --- **Manufacturing & Quality Assurance** **Manufacturing Processes** - Hot forging and cold forming - Precision machining - Solution annealing and age-hardening - Full heat treatment compliance **Quality Control** - Liquid penetrant testing - Magnetic particle testing (when applicable) - Dimensional verification - Pressure testing - Material certification **Certification Requirements** - Mill Test Certificates per EN 10204 3.1 - Chemical analysis reports - Mechanical test reports - Heat treatment records - NDE reports as specified --- **Installation & Maintenance** **Welding Procedures** - **Preferred Method**: GTAW (TIG) - **Filler Metals**: Monel 60 or Monel 67 - **Preheating**: Generally not required - **Post-Weld Heat Treatment**: Aging treatment recommended **Handling & Storage** - Protect threads and sealing surfaces - Store in clean, dry conditions - Keep original packaging until installation - Identify and segregate by size and type --- **Conclusion** Monel K-500 Fittings (UNS N05500) provide an optimal combination of high strength, excellent corrosion resistance, and reliable performance in critical piping applications. Their age-hardening capability ensures maintained mechanical properties in demanding service conditions, while their superior corrosion resistance makes them ideal for marine, chemical processing, oil and gas, and power generation industries. Available in various types and pressure ratings, these fittings offer engineers and designers a robust solution for corrosive and high-stress piping systems where reliability and longevity are essential.

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 1710 gallon liquid totes Special package is available on request.