Alloy 263,Nimonic 263 Tube,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 Tube (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 **tube** form, this material provides exceptional performance in applications requiring superior high-temperature strength, excellent fabricability, and pressure integrity at temperatures up to **950°C (1742°F)**. The tube product is specifically engineered for heat exchangers, instrumentation, and fluid conveyance systems where reliability under thermal stress and corrosive conditions is paramount. --- #### **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 Capability:** - Maintains structural integrity under internal pressure at high temperatures - Excellent resistance to collapse under external pressure - Suitable for high-pressure applications up to 690 bar (10,000 psi) --- #### **5. Key Characteristics & Advantages** - **Excellent High-Temperature Strength**: Maintains mechanical properties under combined thermal and pressure stress - **Superior Fabricability**: Excellent hot and cold workability for tube forming and bending operations - **Outstanding Thermal Fatigue Resistance**: Withstands cyclic temperature variations in tube systems - **Good Weldability**: Can be welded without post-weld heat treatment using conventional methods - **Excellent Oxidation Resistance**: Chromium content provides long-term protection in oxidizing atmospheres - **Age-Hardenable**: Can be heat treated to optimize mechanical properties for specific service conditions - **Pressure Integrity**: Maintains leak-tight performance under demanding service conditions --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine engine heat exchanger tubes - Afterburner fuel injection tubes - Hydraulic and lubrication system tubing - Instrumentation and sensor protection tubes - Exhaust gas temperature (EGT) sensing systems **Power Generation:** - Heat recovery steam generator (HRSG) tubing - Superheater and reheater tubes - Boiler tube applications - Gas turbine cooling air tubes - Steam turbine bypass systems **Industrial Processing:** - Heat exchanger tubing for high-temperature service - Thermocouple protection sheaths - Process furnace radiant tubes - Chemical reactor heat transfer tubes - Thermal oxidizer tubing **Other Applications:** - Test and research facility tubing - Semiconductor processing equipment - Automotive exhaust system components - Specialized high-temperature fluid systems --- #### **7. International Standards** | Standard Organization | Standard Designation | Description | |----------------------|---------------------|-------------| | **ASTM International** | ASTM B622 | Seamless Nickel Alloy Pipe and Tube | | **ASTM International** | ASTM B751 | Welded Nickel Alloy Tube | | **ASTM International** | ASTM B829 | Seamless and Welded Tubing | | **ASME** | SB-622 | Seamless Pipe and Tube (Pressure Vessel Code) | | **ASME** | SB-751 | Welded Tube | | **Aerospace (SAE)** | AMS 5580 | General Purpose Tubing | | **ISO** | ISO 1127 | Stainless Steel Tubes | --- #### **8. Tube Specifications & Availability** **Manufacturing Methods:** - **Seamless Tube**: Hot extruded or cold drawn - **Welded Tube**: GTAW (TIG) or laser welded **Size Ranges:** - **OD Range**: 3 mm to 150 mm (0.125" to 6") - **Wall Thickness**: 0.5 mm to 12 mm (0.02" to 0.5") - **Lengths**: Standard 6-meter or cut-to-length **Tolerances:** - **OD Tolerance**: ±0.1 mm for precision tubes - **Wall Thickness**: ±10% standard, ±5% precision - **Straightness**: 1:1000 for precision applications **Surface Conditions:** - Pickled and cleaned - Bright annealed - Ground and polished - Special coatings available --- #### **9. Heat Treatment** **Standard Tube 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:** - Full heat treatment after cold drawing operations - Localized heat treatment for welded areas - Controlled cooling to prevent distortion --- #### **10. Fabrication & Installation** **Tube Bending & Forming:** - **Cold Bending**: Minimum bend radius 2 × OD - **Hot Bending**: 1050–1150°C (1920–2100°F) - **Mandrel Bending**: Recommended for thin-walled tubes - **Annealing**: Required after severe deformation **Welding Procedures:** - **Preferred Method**: GTAW (TIG) - **Filler Metal**: AWS A5.14 ERNiCrCoMo-1 - **Shielding Gas**: Argon or Argon-Helium mixtures - **Post-Weld Heat Treatment**: Generally not required **Quality Control:** - Eddy current testing per ASTM E309 - Hydrostatic pressure testing - Ultrasonic testing for wall thickness verification - Visual and dimensional inspection --- #### **11. Quality Assurance** **Testing & Certification:** - Hydrostatic testing to 1.5 × design pressure - Non-destructive examination reports - Chemical analysis certification - Mechanical test reports - Material traceability documentation **Special Requirements:** - **Cleanliness**: Specific cleanliness levels for critical applications - **Packaging**: Special packaging to prevent damage - **Documentation**: Full certification per EN 10204 3.1/3.2 - **Traceability**: Complete manufacturing history --- **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 2109 gallon liquid totes Special package is available on request.