Alloy B，Brightray B Bar(Round bar, Flat bar)，,E FORU

British Specs:，American Specs:，German Specs:

### **Technical Datasheet: Brightray® B Alloy Bar (Round & Flat Bar)** **UNS N10001 / NiCr80/20 / 2.4869** --- #### **1. Product Overview** Brightray B alloy bars (round and flat) are wrought nickel-chromium forms designed for high-temperature applications up to **1150°C**. With a nominal composition of 80% nickel and 20% chromium, these bars offer exceptional oxidation resistance, stable electrical properties, and mechanical strength under thermal cycling. Available in various sizes and tempers, they are widely used in heating elements, furnace components, and industrial equipment requiring reliable high-temperature performance. --- #### **2. Key Characteristics** - **Excellent Oxidation Resistance**: Protective Cr₂O₃ scale formation at high temperatures - **High Electrical Resistivity**: ~1.09 μΩ·m for efficient heating applications - **Good Mechanical Strength**: Maintains integrity under thermal stress - **Thermal Cycling Resistance**: Withstands repeated heating/cooling cycles - **Moderate Sulfur Resistance**: Suitable for certain corrosive atmospheres - **Formability & Machinability**: Good workability in annealed condition --- #### **3. Chemical Composition (Weight %)** | Element | Content | |---------|---------| | **Nickel (Ni)** | 78.0–80.0 | | **Chromium (Cr)** | 19.0–21.0 | | **Iron (Fe)** | ≤1.0 | | **Silicon (Si)** | 0.75–1.50 | | **Manganese (Mn)** | 0.50–1.50 | | **Carbon (C)** | ≤0.08 | | **Other Elements** | ≤0.50 total | --- #### **4. Physical Properties** | Property | Value | |----------|-------| | Density | 8.41 g/cm³ | | Melting Point | 1400°C | | Thermal Conductivity (20°C) | 12.5 W/m·K | | Electrical Resistivity (20°C) | 1.09 μΩ·m | | Mean Coefficient of Thermal Expansion (20–1000°C) | 17.0 × 10⁻⁶/°C | | Specific Heat Capacity (20°C) | 440 J/kg·K | | Curie Temperature | -150°C | --- #### **5. Mechanical Properties** **5.1 Round Bar (Typical)** | Condition | Diameter Range (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | |-----------|---------------------|-----------------------|---------------------|----------------| | Annealed | 10–50 | 550–690 | 240–310 | 30–40 | | Cold-Drawn | 10–50 | 690–930 | 620–760 | 8–20 | **5.2 Flat Bar (Typical)** | Condition | Thickness (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | |-----------|----------------|-----------------------|---------------------|----------------| | Annealed | 5–50 | 540–680 | 230–300 | 25–35 | | Hot-Rolled | 5–50 | 590–740 | 280–350 | 20–30 | --- #### **6. International Standards** | Standard | Title / Specification | |----------|----------------------| | **ASTM B166** | Nickel-Chromium-Iron Alloy Rod and Bar | | **DIN 17752** | NiCr20 (Material No. 2.4869) | | **ISO 9725** | Nickel-Chromium Alloy Bars for Electrical Heating | | **GB/T 1234** | High Resistance Alloys for Electrical Heating | | **JIS H4551** | Nickel-Chromium Alloy Bars for Heating Elements | --- #### **7. Product Applications** **7.1 Heating Element Components** - Industrial furnace heating rods and elements - Resistance wire cores and support rods - Radiant tube assemblies **7.2 Thermal Processing Equipment** - Furnace fixtures and brackets - Heat treatment trays and baskets - Thermocouple protection sheaths **7.3 High-Temperature Structural Parts** - Heat exchanger components - Combustion chamber parts - Aerospace engine components **7.4 Electrical Applications** - Electrical resistance components - High-temperature connectors - Heating element terminals --- #### **8. Fabrication & Processing** **8.1 Machining** - Use carbide tools with positive rake angles - Recommended speeds: 20–30 m/min for turning - Use soluble oil coolants for improved finish **8.2 Welding** - TIG and MIG welding recommended - Use matching filler material (AWS A5.14 ERNiCr-3) - Post-weld annealing at 1050–1150°C recommended **8.3 Heat Treatment** - Annealing: 1050–1150°C, rapid cool - Stress relieving: 750–850°C - Avoid temperatures between 550–850°C to prevent sensitization --- #### **9. Quality Assurance** - Chemical composition certification per mill test reports - Dimensional compliance with ASTM/ISO standards - Surface quality: Free from cracks and major imperfections - Ultrasonic testing available for critical applications --- #### **10. Operating Limitations** | Condition | Maximum Temperature | Notes | |-----------|---------------------|-------| | Continuous Air | 1150°C | Recommended maximum | | Intermittent Service | 1200°C | Short-term exposure | | Reducing Atmospheres | 1100°C | Requires atmosphere control | | Sulfur Environments | 800°C | Limited resistance | --- #### **11. Comparative Advantages** - Superior oxidation resistance compared to iron-chromium-aluminum alloys - Better high-temperature strength than lower nickel alloys - Excellent stability under cyclic heating conditions - Cost-effective compared to cobalt-based superalloys --- #### **12. Disclaimer** This technical data is for reference purposes. Actual properties may vary based on manufacturing process, size, and heat treatment. Users should verify suitability for specific applications through testing. Always follow safety guidelines and manufacturer recommendations for fabrication and use.

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 2822 gallon liquid totes Special package is available on request.