Alloy 90,Nimonic 90 Pipe,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 Pipe (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 **pipe** form, this material is engineered for high-temperature pressure applications requiring exceptional creep resistance, oxidation resistance, and structural integrity at temperatures up to **920°C (1688°F)**. The pipe product is specifically designed for conveying hot gases, process fluids, and corrosive media in demanding industrial and aerospace applications where reliability under thermal stress is critical. --- #### **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-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** - **Exceptional High-Temperature Strength**: Maintains structural integrity under internal pressure at elevated temperatures - **Superior Creep Resistance**: Ideal for long-term service under sustained load at high temperatures - **Excellent Oxidation Resistance**: Chromium content provides outstanding protection in oxidizing atmospheres - **Age-Hardenable**: Can be heat treated to achieve optimal mechanical properties - **Good Weldability**: Compatible with standard welding processes using proper procedures - **Thermal Fatigue Resistance**: Withstands cyclic temperature variations in piping systems - **Pressure Integrity**: Maintains leak-proof performance under thermal cycling conditions --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine engine fuel manifolds - Afterburner fuel piping systems - Hydraulic and lubrication system lines - Bleed air system components - Exhaust system ducting **Power Generation:** - High-temperature steam lines - Gas turbine exhaust systems - Heat recovery steam generator (HRSG) tubing - Boiler pressure parts - Superheater and reheater components **Industrial Processing:** - High-temperature furnace piping - Heat treatment atmosphere gas lines - Process gas conveyance systems - Chemical reactor feed lines - Thermal oxidizer piping networks **Other Applications:** - Nuclear reactor instrumentation lines - Semiconductor process gas systems - Test and research facility piping - 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**: 1080°C (1975°F) for 8 hours, air cool 2. **Aging Treatment**: 700°C (1290°F) for 16 hours, air cool **Special Considerations for Pipe:** - Full heat treatment after welding and forming - 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 ERNiCr-3 - **Shielding Gas**: Argon or Argon-Helium mixtures - **Preheat**: Generally not required - **Post-Weld Heat Treatment**: Solution annealing recommended **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 2095 gallon liquid totes Special package is available on request.