Alloy 90,Nimonic 90 Fittings,UNS N07090,E FORU

British Specs:BS HR2 Alloy 90 bar BS HR202 Alloy 90 sheet BS HR402 Alloy 90 tube BS HR501 Alloy 90 wire (springs) BS HR501 Alloy 90 wire (springs)，American Specs:AMS 5829 Welding Wire，German Specs:WS 2.4632

### Technical Datasheet: Alloy 90 / Nimonic 90 Fittings (UNS N07090) --- #### **1. Introduction** **Alloy 90** (commercially known as **Nimonic 90** and standardized as **UNS N07090**) is a nickel-chromium-cobalt superalloy strengthened by age-hardening through titanium and aluminum additions. In **fittings** form, this material is precision-engineered for high-temperature piping systems requiring exceptional creep resistance, oxidation resistance, and pressure integrity at temperatures up to **920°C (1688°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)** | 18.0–21.0 | Oxidation and corrosion resistance | | **Cobalt (Co)** | 15.0–21.0 | Solid solution strengthening | | **Titanium (Ti)** | 2.0–3.0 | Primary age-hardening element (γ' former) | | **Aluminum (Al)** | 1.0–2.0 | Secondary age-hardening element | | **Iron (Fe)** | ≤ 3.0 | Residual element | | **Carbon (C)** | ≤ 0.13 | Grain boundary strengthening | | **Silicon (Si)** | ≤ 1.0 | Oxidation resistance | | **Manganese (Mn)** | ≤ 1.0 | Deoxidation | | **Copper (Cu)** | ≤ 0.2 | Residual element | | **Zirconium (Zr)** | ≤ 0.15 | Creep property enhancement | | **Boron (B)** | ≤ 0.010 | Grain boundary strengthening | --- #### **3. Physical Properties** | Property | Value | Condition | |----------|-------|-----------| | **Density** | 8.19 g/cm³ (0.296 lb/in³) | At 20°C | | **Melting Range** | 1360–1385°C (2480–2525°F) | — | | **Thermal Expansion Coefficient** | 13.9 μm/m·°C | 20–100°C | | **Thermal Conductivity** | 11.7 W/m·K | At 20°C | | **Specific Heat** | 440 J/kg·K | At 20°C | | **Modulus of Elasticity** | 214 GPa (31.0 × 10⁶ psi) | At 20°C | | **Electrical Resistivity** | 1.24 μΩ·m | At 20°C | --- #### **4. Mechanical Properties (Solution Treated & Aged)** **Room Temperature Properties:** - **Tensile Strength**: 1200–1400 MPa (174–203 ksi) - **Yield Strength (0.2% Offset)**: 800–950 MPa (116–138 ksi) - **Elongation**: 20–30% - **Hardness**: 320–380 HB - **Impact Strength**: 25–40 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 ≈ 950 MPa (138 ksi) - **750°C (1380°F)**: Tensile Strength ≈ 700 MPa (102 ksi) - **850°C (1560°F)**: Tensile Strength ≈ 400 MPa (58 ksi) --- #### **5. Key Characteristics & Advantages** - **Exceptional High-Temperature Strength**: Maintains structural integrity under internal pressure at elevated temperatures - **Superior Creep Resistance**: Excellent performance under sustained load at high temperatures - **Outstanding Oxidation Resistance**: Chromium content provides excellent protection in oxidizing atmospheres - **Age-Hardenable**: Can be heat treated to optimize mechanical properties for specific service conditions - **Excellent Weldability**: Compatible with standard welding processes using proper procedures - **Thermal Fatigue Resistance**: Withstands cyclic temperature variations in piping systems - **Dimensional Stability**: Maintains precise tolerances under thermal cycling conditions - **Long Service Life**: Resists degradation in aggressive high-temperature environments --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine engine fuel manifolds and connectors - Afterburner fuel piping fittings - Hydraulic and lubrication system connectors - Bleed air system components - Exhaust system fittings and supports **Power Generation:** - High-temperature steam line fittings - Gas turbine exhaust system connections - Heat recovery steam generator (HRSG) components - Boiler pressure part connections - Superheater and reheater fittings **Industrial Processing:** - High-temperature furnace piping systems - Heat treatment atmosphere gas line fittings - Process reactor connections - Thermal oxidizer piping networks - Chemical processing equipment fittings **Other Applications:** - Glass manufacturing furnace piping systems - Semiconductor process gas line fittings - Nuclear reactor instrumentation connections - Test and research facility piping systems --- #### **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 ERNiCr-3 - **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**: Solution annealing at 1080°C recommended **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 2100 gallon liquid totes Special package is available on request.