800 Nickel, Chromium, Aluminum, and Copper Resistance Wire,ASTM B267,75Ni20Cr2.5Cu2.5AI Alloy,E FORU

### **Product Introduction: 800 Nickel-Chromium-Aluminum-Copper Resistance Wire (75Ni20Cr2.5Cu2.5Al Alloy)** **800 Nickel-Chromium-Aluminum-Copper Resistance Wire** is a specialized nickel-chromium-based resistance alloy manufactured in accordance with ASTM B267 specifications, composed of approximately 75% nickel, 20% chromium, 2.5% copper, and 2.5% aluminum. This advanced resistance alloy is engineered to provide superior high-temperature performance, exceptional oxidation resistance, and enhanced mechanical properties through the strategic addition of aluminum and copper to the traditional nickel-chromium system. The unique composition of this alloy offers improved high-temperature strength and stability, making it particularly suitable for demanding applications where conventional nickel-chromium alloys may not provide adequate performance or service life. --- #### **1. Chemical Composition (Weight %)** The chemical composition of 800 Nickel-Chromium-Aluminum-Copper Resistance Wire per ASTM B267 is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 73.0 - 77.0 | **Chromium (Cr)** | 19.0 - 21.0 | | **Aluminum (Al)** | 2.3 - 2.8 | **Copper (Cu)** | 2.3 - 2.8 | | **Iron (Fe)** | 0.5 - 1.5 | **Manganese (Mn)** | 0.5 - 1.0 | | **Silicon (Si)** | 0.5 - 1.0 | **Carbon (C)** | 0.08 max | | **Sulfur (S)** | 0.01 max | **Phosphorus (P)** | 0.02 max | | **Other Elements** | 0.30 max | | | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.30 g/cm³ | 0.300 lb/in³ | | **Melting Point** | 1380 °C | 2516 °F | | **Maximum Operating Temperature** | 1200 °C | 2192 °F | | **Thermal Conductivity** | 13.5 W/m·K | 93.6 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 14.0 μm/m·°C | 7.8 μin/in·°F | | **Specific Heat** | 460 J/kg·K | 0.110 Btu/lb·°F | | **Magnetic Permeability** | Essentially Non-Magnetic | | **Electrical & Mechanical Properties:** | Property | Value | |----------|-----------------| | **Electrical Resistivity** | 1.18 μΩ·m | 708 Ω·cir mil/ft | | **Temperature Coefficient of Resistance** | 0.00008 °C⁻¹ | | **Tensile Strength** | 850-1000 MPa | 123-145 ksi | | **Yield Strength (0.2% Offset)** | 500-650 MPa | 73-94 ksi | | **Elongation** | 15-25% | | **Hardness (Rockwell B)** | 95-105 HRB | | **Modulus of Elasticity** | 210 GPa | 30.5 x 10⁶ psi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Enhanced High-Temperature Strength**: Aluminum addition provides improved mechanical properties at elevated temperatures - **Superior Oxidation Resistance**: Forms a protective Al-Cr oxide scale for extended service life - **Excellent Thermal Stability**: Copper addition enhances stability under thermal cycling conditions - **Good Electrical Characteristics**: Stable resistivity with low temperature coefficient - **Improved Creep Resistance**: Maintains dimensional stability under load at high temperatures - **Good Fabricability**: Suitable for forming and winding operations **Product Applications:** 800 Nickel-Chromium-Aluminum-Copper Resistance Wire serves demanding applications in various high-temperature sectors: - **Advanced Industrial Heating**: - High-temperature industrial furnace elements - Heat treatment equipment components - Specialized processing furnace elements - High-temperature ceramic kiln elements - **Specialized Electrical Applications**: - High-stability power resistors - Precision electrical heating elements - High-reliability resistance standards - Critical control system heaters - **High-Temperature Technology**: - Aerospace heating components - Semiconductor processing equipment - Research and laboratory furnaces - Advanced materials processing - **Special Applications**: - High-temperature sensor elements - Specialized electrical contacts - High-performance heating systems - Critical thermal processing equipment --- #### **4. International Standards & Specifications** 800 Nickel-Chromium-Aluminum-Copper Resistance Wire complies with the following international standards: **Primary Specifications:** - **ASTM B267**: Standard Specification for Wire for Use in Wire-Wound Resistors **Related Standards:** - **IEC 60115**: Fixed resistors for use in electronic equipment - **DIN 17470**: Resistance alloys for electrical heating - **JIS C 2520**: Resistance alloys for electrical purposes - **UL 758**: Appliance Wiring Material Standard --- #### **Summary of Key Advantages** - **Enhanced High-Temperature Capability**: Superior performance up to 1200°C - **Improved Oxidation Resistance**: Aluminum-enhanced protective scale formation - **Excellent Thermal Stability**: Stable electrical and mechanical properties - **Superior Mechanical Strength**: Enhanced high-temperature strength properties - **Long Service Life**: Extended operational life in demanding applications - **Proven Reliability**: Consistent performance in critical applications **Technical Note**: The aluminum content in 800 Nickel-Chromium-Aluminum-Copper Resistance Wire promotes the formation of a dense, adherent aluminum-chromium oxide scale that provides exceptional protection against high-temperature oxidation. The copper addition contributes to improved thermal stability and electrical characteristics. Proper heat treatment during manufacturing is essential to achieve optimal properties. The alloy requires careful handling during fabrication to maintain surface quality. For best performance in heating elements, appropriate support and mounting techniques should be employed to accommodate thermal expansion and prevent mechanical stress. Storage in controlled environments is recommended to prevent surface contamination that could affect high-temperature 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 3177 gallon liquid totes Special package is available on request.