Nico Copper Nickel Resistance Wire,45Ni55Cu Alloy, ASTM B267,E FORU

### **Product Introduction: Nico Copper Nickel Resistance Wire (45Ni55Cu Alloy)** **Nico Copper Nickel Resistance Wire (45Ni55Cu Alloy)** is a precision copper-nickel resistance alloy manufactured in accordance with ASTM B267 specifications, containing approximately 45% nickel and 55% copper. This specialized resistance alloy is engineered to provide a unique combination of moderate electrical resistivity, excellent corrosion resistance, and low temperature coefficient of resistance, making it particularly suitable for precision resistors, electrical instruments, and temperature measurement applications. The alloy's balanced composition offers stable electrical characteristics across a wide temperature range while maintaining good mechanical properties and fabricability. Its excellent corrosion resistance in marine environments and various industrial atmospheres makes it a reliable choice for demanding electrical applications. --- #### **1. Chemical Composition (Weight %)** The chemical composition of 45Ni55Cu Alloy per ASTM B267 is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 43.0 - 47.0 | **Copper (Cu)** | Balance | | **Iron (Fe)** | 0.50 max | **Manganese (Mn)** | 1.50 max | | **Silicon (Si)** | 0.10 max | **Carbon (C)** | 0.05 max | | **Cobalt (Co)** | 0.10 max | **Aluminum (Al)** | 0.10 max | | **Sulfur (S)** | 0.01 max | **Phosphorus (P)** | 0.02 max | | **Other Elements** | 0.50 max | | | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.90 g/cm³ | 0.321 lb/in³ | | **Melting Point** | 1290 °C | 2354 °F | | **Maximum Operating Temperature** | 500 °C | 932 °F | | **Thermal Conductivity** | 25.0 W/m·K | 173 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 15.0 μm/m·°C | 8.3 μin/in·°F | | **Specific Heat** | 410 J/kg·K | 0.098 Btu/lb·°F | | **Magnetic Permeability** | Essentially Non-Magnetic | | **Electrical & Mechanical Properties:** | Property | Value | |----------|-----------------| | **Electrical Resistivity** | 0.49 μΩ·m | 295 Ω·cir mil/ft | | **Temperature Coefficient of Resistance** | ± 0.00002 °C⁻¹ | | **Tensile Strength** | 450-650 MPa | 65-94 ksi | | **Yield Strength (0.2% Offset)** | 200-400 MPa | 29-58 ksi | | **Elongation** | 25-40% | | **Hardness (Rockwell B)** | 70-90 HRB | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Stable Electrical Resistance**: Minimal resistance change with temperature variations - **Excellent Corrosion Resistance**: Superior performance in marine and industrial environments - **Low Thermal EMF**: Minimal thermal electromotive force against copper - **Good Fabricability**: Excellent formability and weldability characteristics - **Non-Magnetic Properties**: Suitable for sensitive electronic applications - **Moderate Resistivity**: Balanced electrical characteristics for various applications **Product Applications:** 45Ni55Cu Alloy serves critical functions in precision electrical and electronic applications: - **Precision Electrical Instruments**: - Precision wire-wound resistors - Electrical measuring instruments - Potentiometers and rheostats - Bridge circuit components - **Temperature Measurement**: - Resistance temperature detectors (RTDs) - Thermocouple extension wires - Temperature compensation elements - Thermal sensing devices - **Marine & Offshore Applications**: - Marine electrical systems - Offshore platform instrumentation - Shipboard electrical components - Coastal power generation equipment - **Industrial Electronics**: - Power resistors - Current sensing elements - Electrical control systems - Industrial instrumentation --- #### **4. International Standards & Specifications** 45Ni55Cu Alloy complies with the following international standards: **Primary Specifications:** - **ASTM B267**: Standard Specification for Wire for Use in Wire-Wound Resistors **International Equivalents:** - **UNS**: C71500 (Similar copper-nickel alloy classification) - **IEC 60529**: Degrees of protection provided by enclosures - **DIN 17471**: Resistance alloys for electrical purposes - **JIS H 3110**: Copper-nickel and copper-nickel-zinc alloy plates - **BS 115**: Specification for resistance alloys --- #### **Summary of Key Advantages** - **Exceptional Stability**: Minimal resistance change across temperature ranges - **Superior Corrosion Resistance**: Excellent performance in harsh environments - **Precision Characteristics**: Ideal for precision electrical applications - **Reliable Performance**: Consistent electrical and mechanical properties - **Good Fabricability**: Easy to form, wind, and weld - **Proven Reliability**: Established track record in critical applications **Technical Note**: 45Ni55Cu Alloy exhibits excellent stability and minimal aging effects under normal operating conditions. The alloy's low temperature coefficient of resistance makes it particularly suitable for precision applications where resistance stability is critical. For optimal performance in resistance applications, proper annealing treatments are recommended after severe cold working. The material demonstrates good solderability and can be joined using conventional soldering techniques. Storage conditions should prevent surface oxidation and contamination that could affect electrical performance. The alloy's corrosion resistance makes it particularly suitable for marine and industrial applications where environmental factors could compromise performance.

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 3172 gallon liquid totes Special package is available on request.