Alloy 263,Nimonic 263 Fittings,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 Fittings (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 **fittings** form, this material is precision-engineered for high-temperature piping systems requiring exceptional strength, excellent fabricability, and outstanding thermal fatigue resistance at temperatures up to **950°C (1742°F)**. These components are manufactured to maintain leak-proof connections and structural stability under severe thermal cycling and mechanical stress conditions 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 - **Impact Strength**: 40–60 J **Pressure-Temperature Rating:** - Suitable for high-pressure applications up to 690 bar (10,000 psi) - Maintains pressure integrity at temperatures up to 850°C - Excellent resistance to pressure-induced creep deformation **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) --- #### **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 complex fitting geometries - **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 optimize mechanical properties for specific service conditions - **Pressure Integrity**: Maintains leak-proof performance under demanding service conditions - **Long Service Life**: Resists degradation in aggressive high-temperature environments --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine engine exhaust system fittings - Afterburner fuel piping connectors - Hot air bleed system components - Environmental control system duct fittings - Auxiliary power unit exhaust connections **Power Generation:** - Gas turbine exhaust manifold fittings - Heat recovery steam generator (HRSG) system connections - High-temperature steam line fittings - Combustion chamber fuel nozzle adapters - Turbine bypass system components **Industrial Processing:** - High-temperature furnace piping fittings - Process gas conveyance system connectors - Thermal oxidizer ducting fittings - Chemical reactor feed line components - Heat treatment atmosphere line fittings **Other Applications:** - Test cell exhaust system fittings - Research facility high-temperature piping components - Semiconductor process gas line connectors - Specialized high-temperature fluid system fittings --- #### **7. International Standards** | Standard Organization | Standard Designation | Description | |----------------------|---------------------|-------------| | **ASTM International** | ASTM B366 | Factory-Made Wrought Nickel Alloy Fittings | | **ASME** | SB-366 | Factory-Made Wrought Fittings (Pressure Vessel Code) | | **ASME** | B16.9 | Factory-Made Wrought Buttwelding Fittings | | **ASME** | B16.11 | Forged Fittings, Socket-Welding and Threaded | | **MSS** | SP-43 | Wrought Stainless Steel Buttwelding Fittings | | **ISO** | ISO 18279 | Brazing — Imperfections in brazed joints | --- #### **8. Fittings Types & Specifications** **Buttweld Fittings:** - **Elbows**: 45°, 90°, 180° (Long & Short Radius) - **Tees**: Equal and reducing - **Reducers**: Concentric and eccentric - **Caps**: Pipe end closures - **Stub Ends**: Lap joint connections **Socket Weld Fittings:** - **Unions**: 3000 lb, 6000 lb ratings - **Elbows**: 45°, 90° - **Tees**: Straight and reducing - **Couplings**: Full and half - **Plugs and Caps**: Threaded closures **Threaded Fittings:** - **NPT Threads**: American Standard Taper Pipe Thread - **BSPT Threads**: British Standard Pipe Taper - **High-temperature thread compounds compatible** **Flanges:** - **Slip-on**: SO Flanges - **Weld Neck**: WN Flanges - **Blind**: BL Flanges - **Socket Weld**: SW Flanges - **Lap Joint**: LJ Flanges **Special Fittings:** - **Instrumentation Ports**: Thermowell and pressure connections - **Custom Designs**: Engineered to specifications - **Repair Sleeves**: For pipeline maintenance - **Adapter Fittings**: For system transitions --- #### **9. Manufacturing & Quality** **Manufacturing Processes:** - **Hot Forging**: For superior grain structure and mechanical properties - **Cold Forming**: For precise dimensions and improved surface finish - **Precision Machining**: For critical tolerances and complex geometries - **Heat Treatment**: In controlled atmosphere furnaces - **Surface Treatment**: Pickling, passivation, and special coatings **Quality Assurance:** - **Liquid Penetrant Testing**: Per ASTM E165 - **Radiographic Examination**: Per ASTM E94 - **Ultrasonic Testing**: Per ASTM A388 - **Hydrostatic Testing**: Per applicable codes (ASME, API) - **Dimensional Verification**: To specified standards and customer requirements **Pressure Ratings:** - **Schedule**: 5S through XXS - **Class**: 150, 300, 600, 900, 1500, 2500 - **Custom Pressure Ratings**: Available for specific applications - **Temperature-Pressure Ratings**: According to ASME B16.34 --- #### **10. Installation & Maintenance** **Welding Procedures:** - **Preferred Method**: GTAW (TIG) - **Filler Metal**: AWS A5.14 ERNiCrCoMo-1 - **Shielding Gas**: Argon or Argon-Helium mixtures (99.995% purity minimum) - **Preheat**: Generally not required, but 100–150°C recommended for heavy sections - **Post-Weld Heat Treatment**: Generally not required **Installation Guidelines:** - Proper alignment using laser or optical methods to avoid stress concentration - Appropriate gasket selection for high-temperature service (graphite, ceramic) - Correct bolt tightening procedures and sequences (torque or tension methods) - Thermal expansion accommodation in system design - Support spacing per ASME B31.1 or B31.3 requirements **Maintenance Considerations:** - Regular inspection intervals based on service severity (typically 12–24 months) - Non-destructive examination for creep damage and microcracking - Periodic pressure testing for critical systems - Proper handling and storage to prevent mechanical damage - Documentation of service history, inspections, and replacements --- #### **11. Compliance & Certification** **Standards Compliance:** - **PED 2014/68/EU**: Pressure Equipment Directive Category I-IV - **ASME Boiler and Pressure Vessel Code**: Section VIII, Division 1 - **NACE MR0175/ISO 15156**: Sulfide stress cracking resistant materials - **ISO 9001**: Quality management systems - **Customer-specific certifications available** **Documentation:** - **Material Certificates**: EN 10204 3.1/3.2 with full traceability - **Test Reports**: Chemical analysis and mechanical properties - **Inspection Records**: NDT results and dimensional reports - **Heat Treatment Charts**: Time-temperature records - **Compliance Certificates**: Regulatory and customer requirements --- **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 2113 gallon liquid totes Special package is available on request.