Alloy 90,Nimonic 90 Tube,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 Tube (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 **tube** form, this material provides exceptional performance in applications requiring superior high-temperature strength, oxidation resistance, and pressure integrity at temperatures up to **920°C (1688°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)** | 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 **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) **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** - **Exceptional High-Temperature Strength**: Maintains mechanical properties under combined thermal and pressure stress - **Superior Creep Resistance**: Ideal for long-term service under sustained load at elevated temperatures - **Outstanding 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 - **Excellent Fabricability**: Can be bent, formed, and welded with proper techniques - **Thermal Stability**: Resists dimensional changes and property degradation during thermal cycling - **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:** - Superheater and reheater tubes - Heat recovery steam generator (HRSG) tubing - Boiler tube applications - Steam turbine bypass systems - Nuclear reactor instrumentation tubes **Industrial Processing:** - Heat exchanger tubing for high-temperature service - Thermocouple protection sheaths - Process furnace radiant tubes - Chemical reactor heat transfer tubes - Pyroprocessing equipment **Other Applications:** - Glass manufacturing furnace tubes - Semiconductor processing equipment - Automotive exhaust system components - Research and testing equipment --- #### **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**: 1080°C (1975°F) for 8 hours, air cool 2. **Aging Treatment**: 700°C (1290°F) for 16 hours, air cool **Special Considerations:** - Full heat treatment after cold drawing - 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 ERNiCr-3 - **Shielding Gas**: Argon or Argon-Helium mixtures - **Post-Weld Heat Treatment**: Solution annealing recommended **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 2096 gallon liquid totes Special package is available on request.