Alloy 263,Nimonic 263 ,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 (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. This alloy is specifically designed for applications requiring excellent high-temperature strength, good fabricability, and outstanding resistance to thermal fatigue. Alloy 263 maintains its mechanical properties at temperatures up to **950°C (1742°F)** and is particularly valued for its combination of high strength and good weldability. --- #### **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 **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 - **Good Fabricability**: Superior hot and cold workability compared to many superalloys - **Excellent Thermal Fatigue Resistance**: Withstands cyclic temperature variations - **Good Weldability**: Can be welded using conventional methods without post-weld heat treatment - **Outstanding Oxidation Resistance**: Chromium content provides protection in oxidizing atmospheres - **Age-Hardenable**: Can be precipitation hardened to optimize mechanical properties - **Resistance to Combustion Gases**: Suitable for gas turbine applications --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine combustion chambers - Afterburner components - Exhaust system components - Turbine casings and rings - Hot air ducting systems **Power Generation:** - Gas turbine combustion liners - Transition ducts - Afterburner components - Heat exchanger components - High-temperature piping systems **Industrial Processing:** - Heat treatment furnace components - High-temperature fixtures - Chemical processing equipment - Thermal reactor components - High-temperature fan blades **Automotive & Marine:** - Turbocharger components - High-performance exhaust systems - Marine gas turbine components --- #### **7. International Standards** **ASTM Specifications:** - **ASTM B637**: Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock **Aerospace Specifications:** - **AMS 5872**: Sheet, Strip, and Plate - **AMS 5660**: Bars, Forgings, and Rings **European Standards:** - **EN 10095**: Heat resisting steels and nickel alloys - **BS HR 505**: Nickel-cobalt-chromium-molybdenum-titanium-aluminum alloy **International Equivalents:** | Country/Region | Standard | Equivalent Designation | |----------------|----------|------------------------| | **UNS** | N07263 | Material Designation | | **ISO** | ISO 6207 | NiCr20Co20MoTi | | **Germany** | DIN 17742 | NiCr20Co20MoTi | | **France** | NF A54-301 | NiCr20Co20MoTi | | **Japan** | JIS H4551 | NCF 263 | | **China** | GB/T 15008 | GH4263 | --- #### **8. Heat Treatment** **Standard Heat Treatment Cycle:** 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 Available:** - Direct aging after hot working - Stress relieving at 850–900°C (1560–1650°F) - Solution treatment variations for specific properties --- #### **9. Fabrication Notes** **Machining:** - Can be machined using conventional methods - Recommended use of carbide tools - Adequate cooling required during heavy machining **Welding:** - Excellent weldability using GTAW, GMAW, and SMAW - No post-weld heat treatment required for most applications - Recommended filler metal: AWS A5.14 ERNiCrCoMo-1 **Forging & Forming:** - Hot working temperature: 1050–1150°C (1920–2100°F) - Good cold formability in annealed condition - Intermediate annealing may be required for severe forming --- #### **10. Quality Assurance** - Ultrasonic testing per ASTM A388 - Liquid penetrant inspection per ASTM E165 - Chemical analysis certification - Mechanical testing reports - Full traceability with heat numbers --- **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 2105 gallon liquid totes Special package is available on request.