Alloy 263,Nimonic 263 Bar(Round bar, Flat bar),UNS N07263,E FORU

British Specs:BS HR10 BS HR206 BS HR404，American Specs:AMS 5872 Sheet Strip and Plate AMS 5886 Bar and Forgings，German Specs:WS 2.4650

### Technical Datasheet: Alloy 263 / Nimonic 263 Bar (UNS N07263) **Round Bar & Flat Bar** --- #### **1. Introduction** **Alloy 263** (commercially known as **Nimonic 263**, UNS N07263) is a nickel-cobalt-chromium superalloy strengthened by precipitation hardening with additions of titanium and aluminum. Available as **round bar** and **flat bar**, this material is engineered for high-temperature applications requiring excellent strength, fabricability, and thermal fatigue resistance at temperatures up to **950°C (1742°F)**. These product forms are ideal for machining, forging, and fabricating structural components that must withstand severe thermal and mechanical stress conditions. --- #### **2. Chemical Composition (Weight %)** | Element | Content (%) | Role in the Alloy | |---------|-------------|-------------------| | **Nickel (Ni)** | Balance | Austenitic matrix, high-temperature stability | | **Chromium (Cr)** | 19.0–21.0 | Oxidation and corrosion resistance | | **Cobalt (Co)** | 19.0–21.0 | Solid solution strengthening | | **Molybdenum (Mo)** | 5.6–6.1 | Solid solution strengthening | | **Titanium (Ti)** | 1.9–2.4 | Primary age-hardening element (γ' former) | | **Aluminum (Al)** | 0.3–0.6 | Secondary age-hardening element | | **Carbon (C)** | 0.04–0.08 | Grain boundary strengthening | | **Iron (Fe)** | ≤ 0.7 | Residual element | | **Silicon (Si)** | ≤ 0.4 | Oxidation resistance | | **Manganese (Mn)** | ≤ 0.6 | Deoxidation | | **Copper (Cu)** | ≤ 0.2 | Residual element | | **Boron (B)** | ≤ 0.005 | Grain boundary strengthening | --- #### **3. Physical Properties** | Property | Value | Condition | |----------|-------|-----------| | **Density** | 8.36 g/cm³ (0.302 lb/in³) | At 20°C | | **Melting Range** | 1330–1360°C (2426–2480°F) | — | | **Thermal Expansion Coefficient** | 14.4 μm/m·°C | 20–100°C | | **Thermal Conductivity** | 11.2 W/m·K | At 20°C | | **Specific Heat** | 431 J/kg·K | At 20°C | | **Modulus of Elasticity** | 218 GPa (31.6 × 10⁶ psi) | At 20°C | --- #### **4. Mechanical Properties (Solution Treated & Aged)** **Room Temperature Properties:** - **Tensile Strength**: 950–1150 MPa (138–167 ksi) - **Yield Strength (0.2% Offset)**: 550–750 MPa (80–109 ksi) - **Elongation**: 30–45% - **Hardness**: 250–320 HB - **Impact Strength**: 40–60 J **Elevated Temperature Performance:** - **650°C (1200°F)**: Tensile Strength ≈ 750 MPa (109 ksi) - **750°C (1380°F)**: Tensile Strength ≈ 500 MPa (73 ksi) - **850°C (1560°F)**: Tensile Strength ≈ 300 MPa (44 ksi) **Creep Rupture Strength (1000 hours):** - **750°C (1380°F)**: ≈ 150 MPa (22 ksi) - **850°C (1560°F)**: ≈ 60 MPa (9 ksi) --- #### **5. Key Characteristics & Advantages** - **Excellent High-Temperature Strength**: Maintains mechanical properties up to 950°C - **Superior Fabricability**: Excellent hot and cold workability compared to similar superalloys - **Outstanding Thermal Fatigue Resistance**: Withstands cyclic temperature variations - **Good Weldability**: Can be welded without post-weld heat treatment - **Excellent Oxidation Resistance**: Chromium content provides protection in oxidizing atmospheres - **Age-Hardenable**: Can be precipitation hardened to optimize mechanical properties - **Versatile Product Forms**: Available in round and flat bar configurations for diverse applications --- #### **6. Product Applications** **Round Bar Applications:** - Gas turbine combustion chamber supports - Afterburner component shafts - High-temperature valve stems - Turbine structural members - Fastener stock for high-temperature applications **Flat Bar Applications:** - Turbine blade roots and attachments - Combustion chamber structural supports - Heat treatment fixture components - Bracket and mounting systems - Machinery components requiring flat stock **Industry Applications:** - **Aerospace**: Engine components, structural supports, fasteners - **Power Generation**: Gas turbine components, structural supports - **Industrial**: Heat treatment fixtures, high-temperature machinery - **Automotive**: Turbocharger components, high-performance engine parts --- #### **7. International Standards** | Standard Organization | Standard Designation | Description | |----------------------|---------------------|-------------| | **ASTM International** | ASTM B637 | Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock | | **Aerospace (SAE)** | AMS 5660 | Bars, Forgings, and Rings | | **ASME** | SB-637 | Nickel Alloy Bars and Forgings (Pressure Vessel Code) | | **European Standards** | EN 10095 | Heat Resisting Steels and Nickel Alloys | | **ISO** | ISO 6207 | Wrought Nickel and Nickel Alloy Bar | | **Unified Numbering** | UNS N07263 | Material Designation | --- #### **8. Product Specifications & Availability** **Round Bar Specifications:** - **Diameter Range**: 5 mm to 300 mm (0.2" to 12") - **Length**: Standard 3–6 meters (10–20 feet) - **Tolerance**: ±0.1 mm to ±0.5 mm based on diameter - **Straightness**: ≤ 1 mm per meter **Flat Bar Specifications:** - **Thickness**: 5 mm to 100 mm (0.2" to 4") - **Width**: 20 mm to 300 mm (0.8" to 12") - **Length**: Standard 3–6 meters (10–20 feet) - **Flatness**: ≤ 0.5 mm per 100 mm width **Available Conditions:** - **Hot Finished**: Black/scale surface - **Cold Finished**: Turned or ground surface - **Solution Annealed**: Optimized for machining - **Surface Finish**: As-rolled, machined, or ground --- #### **9. Heat Treatment** **Standard Heat Treatment:** 1. **Solution Treatment**: 1150°C (2100°F) for 2 hours, air cool 2. **Aging Treatment**: 800°C (1470°F) for 8 hours, air cool **Special Considerations:** - Controlled atmosphere annealing available - Uniform heating throughout cross-section - Stress relief after machining operations --- #### **10. Fabrication & Machining** **Machining Guidelines:** - **Optimal Condition**: Solution annealed - **Tooling**: Carbide tools with positive rake angles - **Cutting Speed**: 15–25 m/min for turning operations - **Feed Rate**: 0.15–0.35 mm/rev - **Coolant**: Required for heavy machining **Welding Procedures:** - **Preferred Method**: GTAW (TIG) - **Filler Metal**: AWS A5.14 ERNiCrCoMo-1 - **Preheat**: Generally not required - **Post-Weld Heat Treatment**: Generally not required **Forming Operations:** - **Hot Working**: 1050–1150°C (1920–2100°F) - **Cold Working**: Possible with intermediate annealing - **Bending**: Minimum radius = 2 × thickness (flat bar) --- #### **11. Quality Assurance** - Chemical analysis certification - Mechanical testing reports - Ultrasonic testing per ASTM A388 - Dimensional verification - Surface quality inspection - Full material traceability - Compliance with international standards --- **Disclaimer:** This technical data is for informational purposes only. Properties may vary based on manufacturing process, heat treatment, and specific product form. For critical applications, consult current manufacturer technical data sheets and relevant industry standards. Always verify material certification and testing requirements for specific service conditions.

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 2107 gallon liquid totes Special package is available on request.