Alloy 263,Nimonic 263 Pipe,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 Pipe (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 **pipe** form, this material is engineered for high-temperature pressure applications requiring exceptional strength, excellent fabricability, and outstanding thermal fatigue resistance at temperatures up to **950°C (1742°F)**. The pipe product is specifically designed for conveying hot gases, process fluids, and corrosive media in demanding 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% - **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) **Pressure-Temperature Rating:** - Suitable for high-pressure applications up to 100 bar (1450 psi) - Maintains pressure integrity at temperatures up to 850°C - Excellent resistance to pressure-induced creep deformation --- #### **5. Key Characteristics & Advantages** - **Excellent High-Temperature Strength**: Maintains structural integrity under internal pressure at elevated temperatures - **Superior Fabricability**: Excellent hot and cold workability for pipe forming and bending operations - **Outstanding Thermal Fatigue Resistance**: Withstands cyclic temperature variations in piping systems - **Good Weldability**: Can be welded without post-weld heat treatment using conventional methods - **Excellent Oxidation Resistance**: Chromium content provides protection in oxidizing atmospheres - **Age-Hardenable**: Can be heat treated to achieve optimal mechanical properties - **Pressure Integrity**: Maintains leak-proof performance under demanding service conditions --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine engine exhaust systems - Afterburner fuel piping - Hot air bleed systems - Environmental control system ducting - Auxiliary power unit exhausts **Power Generation:** - Gas turbine exhaust manifolds - Heat recovery steam generator (HRSG) systems - High-temperature steam lines - Combustion chamber fuel nozzles - Turbine bypass systems **Industrial Processing:** - High-temperature furnace piping - Process gas conveyance systems - Thermal oxidizer ducting - Chemical reactor feed lines - Heat treatment atmosphere lines **Other Applications:** - Test cell exhaust systems - Research facility high-temperature piping - Semiconductor process gas lines - Specialized high-temperature fluid systems --- #### **7. International Standards** | Standard Organization | Standard Designation | Description | |----------------------|---------------------|-------------| | **ASTM International** | ASTM B619 | Welded Nickel Alloy Pipe | | **ASTM International** | ASTM B622 | Seamless Nickel Alloy Pipe and Tube | | **ASTM International** | ASTM B517 | Seamless and Welded Pipe | | **ASME** | SB-619 | Welded Pipe (Pressure Vessel Code) | | **ASME** | SB-622 | Seamless Pipe and Tube | | **Aerospace (SAE)** | AMS 5580 | General Purpose Tubing | | **ISO** | ISO 1127 | Stainless Steel Pipes | --- #### **8. Pipe Specifications & Availability** **Manufacturing Methods:** - **Seamless Pipe**: Hot extruded or cold drawn - **Welded Pipe**: GTAW (TIG) or laser welded **Size Ranges:** - **OD Range**: 6 mm to 600 mm (0.25" to 24") - **Wall Thickness**: 1 mm to 50 mm (0.04" to 2.0") - **Lengths**: Random 6-7 meters or cut-to-length **Standard Specifications:** - Schedule 5S through XXS - Pressure ratings per ASME B36.10/B36.19 - Custom sizes and configurations available **Surface Conditions:** - Pickled and passivated - Bright annealed - Ground and polished - Beveled ends for welding --- #### **9. Heat Treatment** **Standard Pipe 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 for Pipe:** - Full heat treatment after welding and forming operations - Localized heat treatment for repair and modification - Controlled cooling to prevent distortion and residual stresses --- #### **10. Fabrication & Installation** **Welding Procedures:** - **Preferred Method**: GTAW (TIG) - **Filler Metal**: AWS A5.14 ERNiCrCoMo-1 - **Shielding Gas**: Argon or Argon-Helium mixtures - **Preheat**: Generally not required - **Post-Weld Heat Treatment**: Generally not required **Forming & Bending:** - **Hot Bending**: 1050–1150°C (1920–2100°F) - **Cold Bending**: With appropriate bend radii - **Mandrel Bending**: Recommended for thin-walled pipes **Installation Guidelines:** - Proper support spacing to avoid stress concentration - Accommodation for thermal expansion in system design - Appropriate gasket selection for high-temperature service - Correct bolt tightening procedures and sequences --- #### **11. Quality Assurance** **Testing & Inspection:** - Hydrostatic testing per applicable codes - Ultrasonic testing per ASTM A388 - Eddy current testing for seamless pipes - Radiographic examination for welded pipes - Liquid penetrant testing per ASTM E165 **Certification:** - Chemical analysis certification - Mechanical test reports - Pressure test certificates - Material traceability documentation - Compliance with ASME, ASTM, and 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 2108 gallon liquid totes Special package is available on request.