710 Nickel Chromium Resistance Wire,70Ni30Cr Alloy,E FORU

### **Product Introduction: 710 Nickel Chromium Resistance Wire (70Ni30Cr Alloy)** **710 Nickel Chromium Resistance Wire** is a premium-grade nickel-chromium resistance alloy composed of approximately 70% nickel and 30% chromium. This high-performance resistance wire is specifically engineered for applications demanding exceptional oxidation resistance, stable electrical characteristics, and prolonged service life in high-temperature environments. The alloy represents an optimal balance between superior high-temperature performance and excellent fabricability, making it ideal for critical heating applications across various industries. The carefully controlled composition ensures reliable operation at elevated temperatures while maintaining consistent electrical resistance properties and mechanical integrity under thermal cycling conditions. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of 710 Nickel Chromium Resistance Wire is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 68.0 - 72.0 | **Chromium (Cr)** | 28.0 - 31.0 | | **Iron (Fe)** | 0.5 - 1.0 | **Manganese (Mn)** | 0.5 - 1.5 | | **Silicon (Si)** | 0.5 - 1.5 | **Carbon (C)** | 0.05 - 0.12 | | **Aluminum (Al)** | 0.2 - 0.6 | **Copper (Cu)** | 0.25 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** | 8.35 g/cm³ | 0.302 lb/in³ | | **Melting Point** | 1380 °C | 2516 °F | | **Maximum Operating Temperature** | 1150 °C | 2102 °F | | **Thermal Conductivity** | 14.5 W/m·K | 100.6 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 13.8 μm/m·°C | 7.7 μin/in·°F | | **Specific Heat** | 450 J/kg·K | 0.107 Btu/lb·°F | | **Magnetic Permeability** | Essentially Non-Magnetic | | **Electrical & Mechanical Properties:** | Property | Value | |----------|-----------------| | **Electrical Resistivity** | 1.12 μΩ·m | 672 Ω·cir mil/ft | | **Temperature Coefficient of Resistance** | 0.00010 °C⁻¹ | | **Tensile Strength** | 750-900 MPa | 109-131 ksi | | **Yield Strength (0.2% Offset)** | 400-550 MPa | 58-80 ksi | | **Elongation** | 20-30% | | **Hardness (Rockwell B)** | 85-100 HRB | | **Modulus of Elasticity** | 215 GPa | 31.2 x 10⁶ psi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Excellent High-Temperature Strength**: Maintains structural integrity at temperatures up to 1150°C - **Superior Oxidation Resistance**: Forms protective chromium oxide scale for extended service life - **Stable Electrical Resistance**: Minimal resistance drift under thermal cycling conditions - **Good Thermal Fatigue Resistance**: Withstands repeated heating and cooling cycles - **Excellent Fabricability**: Good formability and weldability characteristics - **Long Service Life**: Reliable performance in continuous high-temperature operation **Product Applications:** 710 Nickel Chromium Resistance Wire serves critical functions in demanding high-temperature applications: - **High-Temperature Industrial Heating**: - Industrial furnace heating elements - Heat treatment equipment components - Ceramic kiln heating elements - Glass manufacturing equipment - **Advanced Consumer Appliances**: - High-performance electric oven elements - Industrial-grade heating appliances - Professional cooking equipment - Premium heating devices - **Specialized Electrical Applications**: - High-temperature power resistors - Precision electrical heating elements - Temperature measurement devices - Critical control system heaters - **Advanced Technology Applications**: - Aerospace heating systems - Semiconductor processing equipment - Laboratory and research equipment - Medical device heating components --- #### **4. International Standards & Specifications** 710 Nickel Chromium Resistance Wire complies with major international standards: **International Standards:** - **ASTM B267**: Standard Specification for Wire for Use in Wire-Wound Resistors - **IEC 60115**: Fixed resistors for use in electronic equipment - **DIN 17470**: Resistance alloys for electrical heating - **JIS C 2520**: Resistance alloys for electrical purposes **Industry Specifications:** - **UL 758**: Appliance Wiring Material - **CSA C22.2**: Canadian Electrical Code Requirements - **RoHS Compliance**: Meets environmental requirements --- #### **Summary of Key Advantages** - **Premium High-Temperature Performance**: Reliable operation up to 1150°C - **Exceptional Oxidation Resistance**: Extended service life in demanding environments - **Superior Electrical Stability**: Consistent resistance characteristics under thermal stress - **Excellent Mechanical Properties**: High strength and good ductility at elevated temperatures - **Proven Reliability**: Established performance in critical applications - **Quality Assurance**: Meets international standards for performance and safety **Technical Note**: 710 Nickel Chromium Resistance Wire develops a dense, adherent chromium oxide protective layer during initial heating cycles, which provides exceptional long-term oxidation protection. The alloy demonstrates minimal resistance drift and maintains stable electrical characteristics throughout its service life. For optimal performance, proper element design and support are essential to prevent sagging and maintain geometric stability at operating temperatures. The material exhibits excellent weldability using matching filler metals and appropriate welding techniques. Storage in dry, clean conditions is recommended to prevent surface contamination that could affect performance. Regular maintenance and proper operating conditions significantly extend the service life of components made from this premium resistance alloy.

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 3176 gallon liquid totes Special package is available on request.