Alloy 90,Nimonic 90 ,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 (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 additions of titanium and aluminum. Developed for high-temperature applications, this alloy offers an excellent combination of high-temperature strength, corrosion resistance, and creep resistance at temperatures up to **920°C (1688°F)**. Nimonic 90 is particularly valued for its balanced properties in both creep and fatigue loading conditions, making it a preferred choice for critical components in aerospace and industrial gas turbines. --- #### **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 (γ' former) | | **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% - **Reduction of Area**: 25–35% - **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) **Creep Rupture Strength (1000 hours):** - **750°C (1380°F)**: ≈ 200 MPa (29 ksi) - **850°C (1560°F)**: ≈ 80 MPa (12 ksi) - **920°C (1688°F)**: ≈ 35 MPa (5 ksi) --- #### **5. Key Characteristics & Advantages** - **Age-Hardenable**: Achieves high strength through precipitation hardening (γ' phase) - **Excellent Creep Resistance**: Maintains load-bearing capability under sustained stress at high temperatures - **Superior Oxidation Resistance**: Chromium content provides excellent protection against oxidizing environments - **Good Thermal Fatigue Resistance**: Withstands cyclic temperature variations - **Moderate Fabricability**: Can be machined, forged, and welded with proper techniques - **High Strength-to-Weight Ratio**: Excellent mechanical properties relative to density - **Long-Term Microstructural Stability**: Resists phase transformation during prolonged high-temperature exposure --- #### **6. Product Applications** **Aerospace & Defense:** - Gas turbine engine blades and vanes - Turbine discs and rotor components - Combustion chamber parts - Afterburner components - Exhaust system components **Industrial Gas Turbines:** - Turbine blades and nozzles - Rotor components - High-temperature fasteners - Sealing elements - Shafts and discs **Power Generation:** - Steam turbine blades - High-temperature bolting - Valve components - Heat exchanger components **Automotive & Racing:** - Turbocharger components - High-performance engine valves - Racing exhaust systems - High-temperature fasteners **Other Applications:** - Nuclear reactor components - Heat treatment fixtures - Chemical processing equipment - High-temperature springs --- #### **7. International Standards** **ASTM Specifications:** - **ASTM B637**: Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock **Aerospace Specifications:** - **AMS 5660**: Bars, Forgings, and Rings (Solution Heat Treated and Aged) - **AMS 5702**: Wire, Welding - **AMS 5872**: Sheet, Strip, and Plate **European Standards:** - **EN 10095**: Heat resisting steels and nickel alloys - **BS HR 502**: Nickel-chromium-cobalt-titanium-aluminum alloy - **DIN 17742**: Wrought nickel and nickel alloys **International Equivalents:** | Country/Region | Standard | Equivalent Designation | |----------------|----------|------------------------| | **UNS** | N07090 | Material Designation | | **ISO** | ISO 6207 | NiCr20Co18Ti | | **Germany** | DIN 17742 | NiCr20Co18Ti | | **France** | NF A54-301 | NiCr20Co18Ti | | **Japan** | JIS H4551 | NCF 90 | | **China** | GB/T 15008 | GH4090 | --- #### **8. Heat Treatment** **Standard Heat Treatment Cycle:** 1. **Solution Treatment**: 1080°C (1975°F) for 8 hours, air cool 2. **Aging Treatment**: 700°C (1290°F) for 16 hours, air cool **Alternative Treatments Available:** - Modified solution temperatures for specific properties - Double aging treatments for optimized performance - Stress relieving treatments for fabricated components --- #### **9. Fabrication Notes** **Machining:** - Best machined in solution treated condition - Requires rigid setups and positive rake angles - Recommended use of carbide tools with adequate cooling **Welding:** - Weldable using GTAW and GMAW processes - Recommended filler metal: AWS A5.14 ERNiCr-3 - Post-weld heat treatment generally required **Forging:** - Forging temperature range: 1050–1150°C (1920–2100°F) - Requires controlled cooling after forging --- #### **10. Quality Assurance** - Ultrasonic testing per ASTM A388 - Liquid penetrant inspection per ASTM E165 - Chemical analysis certification - Mechanical testing reports - Full traceability with heat numbers --- **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 2092 gallon liquid totes Special package is available on request.