Alloy K500，Monel K500 Strip，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 Strip / UNS N05500 - Age-Hardenable Nickel-Copper Alloy Strip** **Product Overview** Monel K-500 Strip (UNS N05500) is a high-precision, precipitation-hardenable nickel-copper alloy supplied in thin strip form, combining the excellent corrosion resistance of Monel 400 with enhanced strength and hardness through age-hardening treatment. This product is specifically engineered for applications requiring tight tolerances, precise dimensions, and excellent surface finish, making it ideal for electronic components, springs, fasteners, and precision instruments in demanding environments. **Chemical Composition (ASTM B865)** | 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 | *Strengthening is achieved through precipitation 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 (Strip - Aged Condition)** *Aging Treatment: 1100°F (593°C) for 16 hours, furnace cool* | Property | Solution Annealed | Age-Hardened (H900) | |----------|-------------------|--------------| | **Tensile Strength** | 620-760 MPa (90-110 ksi) | 1030-1240 MPa (150-180 ksi) | | **Yield Strength (0.2% Offset)** | 275-415 MPa (40-60 ksi) | 965-1170 MPa (140-170 ksi) | | **Elongation in 2"** | 35-45% | 8-15% | | **Hardness** | 70-85 HRB | 36-42 HRC | | **Fatigue Strength** | 240 MPa (35 ksi) | 415 MPa (60 ksi) | **Available Strip Specifications** **Product Forms** - Cold-rolled strip - Precision slit strip - Hard, half-hard, and spring tempers - Annealed and age-hardened conditions **Thickness Ranges** - **Standard Strip**: 0.05 mm to 2.0 mm (0.002" to 0.078") - **Ultra-Thin Strip**: 0.025 mm to 0.05 mm (0.001" to 0.002") - **Width**: 2 mm to 600 mm (0.08" to 24") - **Coil Weight**: Up to 2000 kg (4400 lbs) **Tolerances** - **Thickness**: ±0.005 mm for precision grades - **Width**: ±0.05 mm for slit edges - **Camber**: 1 mm per 2 meters maximum - **Flatness**: Excellent for precision applications **Surface Finish Options** - Bright cold-rolled finish - Matte finish - Polished finish (one or two sides) - Special surface treatments available **Key Characteristics & Advantages** 1. **High Strength in Thin Sections**: Maintains excellent mechanical properties in ultra-thin gauges 2. **Superior Corrosion Resistance**: Outstanding performance in marine, chemical, and acidic environments 3. **Excellent Spring Properties**: High yield strength and good elastic modulus for spring applications 4. **Precision Dimensional Control**: Tight tolerances for critical components 5. **Non-Magnetic Characteristics**: Essential for electronic and instrument applications 6. **Good Formability**: Can be stamped, bent, and formed in annealed condition **Product Applications** **Electronics & Electrical** - Connector components - Spring contacts - Lead frames - Shielding components **Precision Instruments** - Instrument springs - Sensing elements - Precision gears - Watch and clock components **Spring Applications** - High-performance springs - Diaphragms - Bellows - Snap-action components **Fastener Industry** - Precision washers - Lock washers - Spring clips - Retaining rings **Medical Devices** - Surgical instrument components - Implantable device parts - Medical spring components - Diagnostic equipment parts **International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | **N05500** | Unified Numbering System | | **ASTM** | B865 | Precipitation Hardening Nickel-Copper-Aluminum-Titanium Alloy Strip | | **ASTM** | B906 | General Requirements for Flat-Rolled Nickel and Nickel Alloys Strip | | **AMS** | 4676 | Aerospace Material Specification (Reference for strip applications) | | **DIN** | 2.4375 | German Standard Designation | | **EN** | NiCu30Al | European Standard | | **JIS** | NW 5500 | Japanese Industrial Standard | **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 & Processing** **Forming Operations** - **Blanking**: Excellent for precision blanking operations - **Bending**: Minimum bend radius 1T (annealed), 3T (aged) - **Stamping**: Suitable for high-speed stamping operations - **Coining**: Good for precision coining applications **Spring Manufacturing** - **Spring Design**: Excellent spring properties when age-hardened - **Forming**: Form in annealed condition, then age-harden - **Set Removal**: Thermal treatment available for spring set removal **Surface Treatment** - **Cleaning**: Alkaline cleaning recommended - **Pickling**: Nitric-hydrofluoric acid mixture for scale removal - **Plating**: Can be plated with gold, silver, or nickel for specific applications **Quality Assurance** All Monel K-500 strip supplied with comprehensive certification: - Mill Test Certificates to ASTM/EN standards - Chemical analysis certificates - Mechanical test reports - Dimensional inspection reports - Surface quality certifications - Heat treatment records - Special testing (eddy current, ultrasonic) available **Packaging & Handling** - Protective interleaving between layers - Moisture-proof packaging - Wooden or steel reels for coil products - Edge protection for precision strips **Conclusion** Monel K-500 Strip (UNS N05500) offers an exceptional combination of high strength, excellent corrosion resistance, and precision dimensional characteristics in strip form. Its age-hardening capability allows manufacturers to fabricate complex components in the annealed condition and subsequently develop high strength through heat treatment. This makes it particularly valuable for spring, electronic, and precision instrument applications where reliability, corrosion resistance, and consistent performance are critical in demanding service 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 1709 gallon liquid totes Special package is available on request.