Alloy 263,Nimonic 263 Rod,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 Rod (UNS N07263) --- #### **1. Introduction** **Alloy 263** (commercially known as **Nimonic 263** and standardized as **UNS N07263**) is a nickel-cobalt-chromium superalloy strengthened by precipitation hardening with additions of titanium and aluminum. In **rod** form, this material provides exceptional high-temperature strength, excellent fabricability, and outstanding thermal fatigue resistance at temperatures up to **950°C (1742°F)**. The rod product is specifically engineered for machining critical components that must maintain mechanical integrity under severe thermal and mechanical stress conditions in aerospace, power generation, and industrial applications. --- #### **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 | | **Electrical Resistivity** | 1.26 μΩ·m | 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% - **Reduction of Area**: 40–55% - **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) - **950°C (1742°F)**: ≈ 25 MPa (4 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 using conventional methods 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 - **Good Machinability**: Can be precision machined in solution treated condition - **Consistent Quality**: Rod form ensures uniform microstructure and mechanical properties --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine engine combustion components - Afterburner structural parts - Exhaust system supports - Turbine casing bolts and fasteners - Engine mounting components **Power Generation:** - Gas turbine combustion chamber supports - Transition duct hangers - Afterburner component shafts - High-temperature valve stems - Turbine structural members **Industrial Processing:** - Heat treatment furnace components - High-temperature fixture rods - Process reactor internals - Thermal processing shafts - High-temperature actuator components **Other Applications:** - Turbocharger shafts - High-performance engine components - Test and research equipment - Specialized fastening systems --- #### **7. International Standards** **ASTM Specifications:** - **ASTM B637**: Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock **Aerospace Specifications:** - **AMS 5660**: Bars, Forgings, and Rings (Solution Heat Treated and Aged) - **AMS 5702**: Wire, Welding **European Standards:** - **EN 10095**: Heat resisting steels and nickel alloys - **BS HR 505**: Nickel-cobalt-chromium-molybdenum-titanium-aluminum alloy - **DIN 17742**: Wrought nickel and nickel alloys **International Equivalents:** | Country/Region | Standard | Equivalent Designation | |----------------|----------|------------------------| | **UNS** | N07263 | Material Designation | | **ISO** | ISO 6207 | NiCr20Co20MoTi | | **Germany** | DIN 17742 | NiCr20Co20MoTi | | **Japan** | JIS H4551 | NCF 263 | | **China** | GB/T 15008 | GH4263 | --- #### **8. Rod Specifications & Availability** **Diameter Range:** - **Small Diameter**: 3 mm to 20 mm (0.125" to 0.75") - **Medium Diameter**: 20 mm to 100 mm (0.75" to 4") - **Large Diameter**: 100 mm to 300 mm (4" to 12") **Lengths:** - **Standard Lengths**: 3–6 meters (10–20 feet) - **Cut-to-Length**: Available per customer requirements - **Random Lengths**: For large diameter rods **Surface Finish:** - **Hot Finished**: Black/scale surface - **Turned**: Smooth machined surface - **Ground**: Precision ground finish - **Polished**: Special finish available **Tolerances:** - **Diameter Tolerance**: h11 for standard, h9 for precision - **Straightness**: 1 mm per meter maximum - **Out-of-Round**: ≤ 0.5% of diameter --- #### **9. Heat Treatment** **Standard Heat Treatment for Rods:** 1. **Solution Treatment**: 1150°C (2100°F) for 2 hours, air cool 2. **Aging Treatment**: 800°C (1470°F) for 8 hours, air cool **Alternative Treatments:** - Direct aging after hot working for specific applications - Stress relief at 850–900°C (1560–1650°F) - Custom heat treatment cycles available --- #### **10. Fabrication & Machining** **Machining Guidelines:** - **Optimal Condition**: Solution treated condition - **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 operations **Welding Procedures:** - **Preferred Method**: GTAW (TIG) - **Filler Metal**: AWS A5.14 ERNiCrCoMo-1 - **Preheat**: Generally not required - **Post-Weld Heat Treatment**: Generally not required **Quality Control:** - Ultrasonic testing per ASTM A388 - Liquid penetrant inspection per ASTM E165 - Dimensional verification - Surface quality inspection --- #### **11. Quality Assurance** - Chemical analysis certification - Mechanical testing reports - Non-destructive testing reports - Heat treatment records - Full traceability with heat numbers - Compliance with customer specifications --- **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 2106 gallon liquid totes Special package is available on request.