Nickel Alloy 120 Nickel Iron Resistance Wire,70Ni30Fe Alloy,ASTM B267,E FORU

### **Product Introduction: Nickel Alloy 120 (70Ni30Fe) Nickel Iron Resistance Wire** **Nickel Alloy 120** is a nickel-iron resistance alloy composed of approximately 70% nickel and 30% iron, manufactured in accordance with ASTM B267 specifications. This specialized resistance alloy is engineered to provide a precise combination of electrical resistance characteristics, thermal stability, and mechanical properties, making it particularly suitable for electrical heating elements and precision resistance applications. The alloy's carefully balanced composition ensures consistent electrical resistivity and reliable performance across a wide temperature range, while its excellent oxidation resistance and thermal stability make it ideal for continuous operation in demanding electrical heating applications. --- #### **1. Chemical Composition (Weight %)** The chemical composition of Nickel Alloy 120 per ASTM B267 is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 68.0 - 72.0 | **Iron (Fe)** | Balance | | **Manganese (Mn)** | 0.50 - 1.50 | **Silicon (Si)** | 0.50 - 1.50 | | **Carbon (C)** | 0.05 - 0.15 | **Chromium (Cr)** | 0.50 max | | **Copper (Cu)** | 0.25 max | **Aluminum (Al)** | 0.50 max | | **Sulfur (S)** | 0.015 max | **Phosphorus (P)** | 0.02 max | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.45 g/cm³ | 0.305 lb/in³ | | **Melting Point** | 1425 °C | 2597 °F | | **Maximum Operating Temperature** | 600 °C | 1112 °F | | **Thermal Conductivity** | 19.0 W/m·K | 132 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 14.0 μm/m·°C | 7.8 μin/in·°F | | **Specific Heat** | 500 J/kg·K | 0.119 Btu/lb·°F | | **Curie Temperature** | 360 °C | 680 °F | **Electrical & Mechanical Properties:** | Property | Value | |----------|-----------------| | **Electrical Resistivity** | 0.35 μΩ·m | 210 Ω·cir mil/ft | | **Temperature Coefficient of Resistance** | 0.0012 °C⁻¹ | | **Tensile Strength** | 550-750 MPa | 80-109 ksi | | **Yield Strength (0.2% Offset)** | 250-450 MPa | 36-65 ksi | | **Elongation** | 20-35% | | **Hardness (Rockwell B)** | 75-95 HRB | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Controlled Electrical Resistivity**: Precise and consistent resistance characteristics - **Good Oxidation Resistance**: Suitable for continuous operation in air up to 600°C - **Thermal Stability**: Minimal resistance drift during thermal cycling - **Good Formability**: Can be wound and formed into complex heating element shapes - **Magnetic Properties**: Exhibits ferromagnetic characteristics below Curie temperature - **Cost-Effective Performance**: More economical than high-nickel resistance alloys **Product Applications:** Nickel Alloy 120 serves critical functions in various electrical heating and resistance applications: - **Industrial Heating Elements**: - Industrial furnace heating elements - Heat treatment oven elements - Process heating equipment - Industrial dryer components - **Consumer Appliances**: - Electric stove and oven elements - Toaster and toaster oven wires - Space heater elements - Appliance thermal cutoffs - **Electrical Components**: - Power resistors and rheostats - Current-limiting devices - Electrical ballasts - Precision resistance standards - **Specialized Applications**: - Automotive glow plugs - Laboratory heating equipment - Temperature control devices - Electrical instrumentation --- #### **4. International Standards & Specifications** Nickel Alloy 120 complies with the following international standards: **Primary Specifications:** - **ASTM B267**: Standard Specification for Wire for Use in Wire-Wound Resistors **International Equivalents:** - **UNS**: N02770 - **IEC 60115**: Fixed resistors for use in electronic equipment - **DIN 17471**: Resistance alloys for electrical purposes - **JIS C 2520**: Resistance alloys for electrical heating - **BS 115**: Specification for resistance alloys --- #### **Summary of Key Advantages** - **Optimized Electrical Properties**: Controlled resistivity with excellent stability - **Cost-Effective Composition**: Balanced performance at competitive cost - **Good Thermal Capability**: Suitable for continuous operation up to 600°C - **Reliable Performance**: Consistent characteristics under thermal cycling - **Excellent Fabricability**: Easy to form and wind into heating elements - **Proven Reliability**: Established track record in resistance applications **Technical Note**: Nickel Alloy 120 develops a protective oxide scale during initial heating cycles, which provides long-term oxidation protection. The alloy's electrical resistivity increases with temperature, requiring proper circuit design to maintain consistent power output. For heating element applications, the wire should be properly supported to prevent sagging at operating temperatures. The material exhibits good weldability using resistance welding techniques. Storage conditions should prevent moisture absorption and surface contamination that could affect electrical performance. Proper annealing treatments may be required after severe cold working to restore optimal electrical properties.

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 3171 gallon liquid totes Special package is available on request.