650 Nickel Chromium Resistance Wire,80Ni20Cr Alloy,ASTM B267, ASTM B344,E FORU

### **Product Introduction: 650 Nickel Chromium Resistance Wire (80Ni20Cr Alloy)** **650 Nickel Chromium Resistance Wire** is a high-performance nickel-chromium resistance alloy manufactured in accordance with ASTM B267 and ASTM B344 specifications, composed of approximately 80% nickel and 20% chromium. This premium resistance alloy is specifically engineered for high-temperature applications requiring exceptional oxidation resistance, stable electrical characteristics, and long service life in demanding thermal environments. The alloy's optimized composition provides outstanding performance in high-temperature oxidizing atmospheres, making it particularly suitable for heating elements and resistance applications operating at elevated temperatures up to 1200°C (2192°F). --- #### **1. Chemical Composition (Weight %)** The chemical composition of 650 Nickel Chromium Resistance Wire per ASTM standards is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 75.0 - 78.0 | **Chromium (Cr)** | 19.0 - 21.0 | | **Iron (Fe)** | 0.5 - 1.5 | **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** | 8.40 g/cm³ | 0.303 lb/in³ | | **Melting Point** | 1400 °C | 2552 °F | | **Maximum Operating Temperature** | 1200 °C | 2192 °F | | **Thermal Conductivity** | 15.0 W/m·K | 104.0 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 13.5 μm/m·°C | 7.5 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** | 1.09 μΩ·m | 650 Ω·cir mil/ft | | **Temperature Coefficient of Resistance** | 0.00013 °C⁻¹ | | **Tensile Strength** | 780-880 MPa | 113-128 ksi | | **Yield Strength (0.2% Offset)** | 450-550 MPa | 65-80 ksi | | **Elongation** | 20-30% | | **Hardness (Rockwell B)** | 85-95 HRB | | **Modulus of Elasticity** | 220 GPa | 31.9 x 10⁶ psi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Excellent High-Temperature Strength**: Maintains structural integrity at temperatures up to 1200°C - **Superior Oxidation Resistance**: Forms protective chromium oxide scale for extended service life - **Stable Electrical Resistance**: Consistent performance 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:** 650 Nickel Chromium Resistance Wire serves critical functions in high-temperature electrical applications: - **Industrial Heating Systems**: - High-temperature industrial furnaces - Heat treatment equipment elements - Ceramic kiln heating elements - Glass melting furnace components - **Consumer Heating Appliances**: - Electric oven and range elements - Industrial toasters and food equipment - High-temperature space heaters - Appliance heating components - **Electrical & Electronic Applications**: - High-temperature power resistors - Electrical heating elements - Temperature sensing elements - Specialized electrical components - **Specialized Industrial Applications**: - Aerospace heating systems - Laboratory high-temperature equipment - Process heating elements - Thermal processing systems --- #### **4. International Standards & Specifications** 650 Nickel Chromium 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**: N06006 - **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** - **Exceptional High-Temperature Performance**: Reliable operation up to 1200°C - **Superior Oxidation Resistance**: Extended service life in oxidizing atmospheres - **Stable Electrical Characteristics**: Consistent resistance properties under thermal cycling - **Excellent Mechanical Properties**: Good strength and durability at elevated temperatures - **Proven Reliability**: Established performance history in demanding applications - **Comprehensive Standardization**: Meets international quality and performance standards **Technical Note**: 650 Nickel Chromium Resistance Wire develops a protective, adherent chromium oxide scale during initial heating cycles, which provides excellent long-term oxidation protection. The alloy's electrical resistivity increases with temperature, requiring appropriate circuit design considerations for consistent power output. For optimal performance, heating elements should be properly supported to maintain geometry at operating temperatures. The material exhibits good weldability using compatible nickel-chromium filler metals. Storage conditions should prevent surface contamination that could affect high-temperature performance. Proper annealing treatments may be necessary after severe cold working to restore optimal properties for high-temperature service.

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 3174 gallon liquid totes Special package is available on request.