675 Nickel, Chromium and Iron Resistance Wire,60Ni24Fe16Cr Alloy,ASTM B267, ASTM B344,E FORU

### **Product Introduction: 675 Nickel-Chromium-Iron Resistance Wire (60Ni16Cr24Fe Alloy)** **675 Nickel-Chromium-Iron Resistance Wire** is a nickel-chromium-iron resistance alloy manufactured in accordance with ASTM B267 and ASTM B344 specifications, composed of approximately 60% nickel, 16% chromium, and 24% iron. This versatile resistance alloy is engineered to provide an optimal balance of electrical resistance characteristics, oxidation resistance, and cost-effectiveness, making it suitable for a wide range of medium-temperature heating applications. The alloy's carefully balanced composition offers reliable performance at elevated temperatures while maintaining good fabricability and mechanical strength, serving as an economical alternative to higher-nickel content resistance alloys. --- #### **1. Chemical Composition (Weight %)** The chemical composition of 675 Nickel-Chromium-Iron Resistance Wire per ASTM standards is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 58.0 - 62.0 | **Chromium (Cr)** | 15.0 - 17.0 | | **Iron (Fe)** | 22.0 - 25.0 | **Manganese (Mn)** | 1.0 - 2.0 | | **Silicon (Si)** | 0.5 - 1.5 | **Carbon (C)** | 0.08 - 0.15 | | **Aluminum (Al)** | 0.2 - 0.6 | **Copper (Cu)** | 0.25 max | | **Sulfur (S)** | 0.015 max | **Phosphorus (P)** | 0.02 max | | **Other Elements** | 0.50 max | | | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.25 g/cm³ | 0.298 lb/in³ | | **Melting Point** | 1390 °C | 2534 °F | | **Maximum Operating Temperature** | 950 °C | 1742 °F | | **Thermal Conductivity** | 17.5 W/m·K | 121.4 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 14.2 μm/m·°C | 7.9 μin/in·°F | | **Specific Heat** | 480 J/kg·K | 0.115 Btu/lb·°F | | **Curie Temperature** | 350 °C | 662 °F | **Electrical & Mechanical Properties:** | Property | Value | |----------|-----------------| | **Electrical Resistivity** | 0.95 μΩ·m | 570 Ω·cir mil/ft | | **Temperature Coefficient of Resistance** | 0.00018 °C⁻¹ | | **Tensile Strength** | 650-800 MPa | 94-116 ksi | | **Yield Strength (0.2% Offset)** | 350-500 MPa | 51-73 ksi | | **Elongation** | 25-35% | | **Hardness (Rockwell B)** | 80-95 HRB | | **Modulus of Elasticity** | 190 GPa | 27.6 x 10⁶ psi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Good Oxidation Resistance**: Suitable for continuous operation in air up to 950°C - **Balanced Electrical Properties**: Moderate resistivity with good temperature stability - **Cost-Effective Performance**: Economical alternative to high-nickel alloys - **Good Fabricability**: Excellent formability and welding characteristics - **Moderate High-Temperature Strength**: Maintains mechanical integrity at operating temperatures - **Thermal Stability**: Reliable performance under thermal cycling conditions **Product Applications:** 675 Nickel-Chromium-Iron Resistance Wire serves various medium-temperature electrical applications: - **Industrial Heating Systems**: - Industrial oven heating elements - Heat treatment furnace components - Process heating equipment - Industrial drying systems - **Consumer Appliances**: - Electric range and oven elements - Clothes dryer heating elements - Water heater elements - Household heating appliances - **Electrical Components**: - Medium-temperature power resistors - Electrical heating elements - Current-limiting resistors - Control system heaters - **Commercial Equipment**: - Commercial food service equipment - Vending machine heaters - HVAC system components - Industrial process controls --- #### **4. International Standards & Specifications** 675 Nickel-Chromium-Iron Resistance Wire complies with the following international standards: **Primary Specifications:** - **ASTM B267**: Standard Specification for Wire for Use in Wire-Wound Resistors - **ASTM B344**: Nickel-Chromium-Iron Alloy Rod and Bar **International Equivalents:** - **UNS**: N06600 (Similar alloy classification) - **IEC 60115**: Fixed resistors for use in electronic equipment - **DIN 17470**: Resistance alloys for electrical heating - **JIS C 2520**: Resistance alloys for electrical purposes - **BS 115**: Specification for resistance alloys - **EN 10095**: Heating elements and resistance materials --- #### **Summary of Key Advantages** - **Cost-Effective Solution**: Optimal balance of performance and economy - **Good Thermal Performance**: Reliable operation up to 950°C - **Adequate Oxidation Resistance**: Suitable for medium-temperature applications - **Excellent Fabricability**: Easy to form, wind, and weld - **Stable Electrical Characteristics**: Consistent performance under operating conditions - **Proven Reliability**: Established track record in various applications **Technical Note**: 675 Nickel-Chromium-Iron Resistance Wire develops a protective oxide scale during initial heating cycles, providing adequate oxidation protection for medium-temperature applications. The alloy's electrical characteristics show moderate temperature dependence, requiring appropriate circuit design considerations. For optimal performance in heating elements, proper support and mounting are essential to maintain element geometry. The material exhibits good weldability using compatible nickel-chromium filler metals. Storage conditions should prevent excessive surface oxidation that could affect performance. Intermediate annealing may be required after severe cold working operations to restore optimal properties for final applications. The alloy offers a practical balance between performance and cost for applications where the extreme high-temperature capabilities of premium nickel-chromium alloys are not required.

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 3175 gallon liquid totes Special package is available on request.