NIMONIC Alloy 90,Nickel-Chromium Alloy; UNS N07090; ，1

### **Product Introduction: NIMONIC® Alloy 90 (UNS N07090)** **NIMONIC® Alloy 90** is a precipitation-hardenable nickel-chromium-cobalt alloy that represents a significant advancement in the Nimonic series, offering superior high-temperature strength compared to its predecessors like Alloy 80A. It is engineered to deliver an excellent combination of high tensile and creep-rupture strength, outstanding oxidation resistance, and good fatigue properties at temperatures up to 920°C (1690°F). The alloy is strengthened by the addition of titanium and aluminum, which form the coherent gamma prime (γ') phase, Ni₃(Al, Ti), during a controlled aging heat treatment. This mechanism provides a substantial increase in high-temperature load-bearing capacity, making it a classic and widely used "workhorse" superalloy for highly stressed components in jet engines and industrial gas turbines. --- ### **International Standards & Material Equivalents** NIMONIC Alloy 90 is covered by a comprehensive set of international standards, reflecting its global acceptance and long-standing reliability. | Standard Type | Standard Number | Designation / Product Form | | :--- | :--- | :--- | | **UNS (USA)** | **N07090** | **NIMONIC Alloy 90** | | **AMS (Aerospace)** | **5840** | Bar and Forgings | | **AMS (Aerospace)** | **5740** | Billet and Bar (for Reforging) | | **BS (UK)** | **HR 503** | Bar and Forgings | | **DIN (Germany)** | 17742 | NiCr20Co15Ti | | **Werkstoff Nr.** | **2.4632** | **2.4632** | | **AFNOR (France)** | NC20K14 | | | **ISO** | 9725 | NiCr20Co15TiAl | > **Note:** NIMONIC is a registered trademark. The primary identifiers are **UNS N07090** and **Werkstoff 2.4632**. --- ### **Chemical Composition** The composition is precisely balanced to optimize the gamma prime precipitation and provide solid-solution strengthening. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 18.0 - 21.0 | | **Cobalt (Co)** | 15.0 - 21.0 | | **Titanium (Ti)** | 2.0 - 3.0 | | **Aluminum (Al)** | 1.0 - 2.0 | | **Iron (Fe)** | 3.0 max. | | **Carbon (C)** | 0.13 max. | | **Silicon (Si)** | 1.0 max. | | **Manganese (Mn)** | 1.0 max. | | **Copper (Cu)** | 0.2 max. | --- ### **Physical Properties** Nimonic 90 exhibits physical properties that support its use in high-stress, high-temperature environments. | Property | Value | | :--- | :--- | | **Density** | 8.19 g/cm³ (0.296 lb/in³) | | **Melting Point** | ~1350 - 1400 °C (~2460 - 2550 °F) | | **Thermal Conductivity** | 11.9 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.25 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 222 GPa (32.2 x 10⁶ psi) | | **Coefficient of Thermal Expansion** | 13.5 μm/m·°C (20-100°C) | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties (Typical for Solution Treated and Aged Condition)** The alloy achieves its high strength through a two-step heat treatment: solution treatment followed by aging. | Property | Value (Room Temperature, Aged) | | :--- | :--- | | **Tensile Strength** | 1100 - 1300 MPa (160 - 189 ksi) | | **Yield Strength (0.2% Offset)** | 750 - 900 MPa (109 - 131 ksi) | | **Elongation** | 20% - 30% | | **Hardness (Rockwell C)** | 30 - 40 HRC | --- ### **Key Characteristics & Advantages** 1. **Excellent Creep and Rupture Strength:** Its primary advantage is the ability to withstand high mechanical loads for extended periods at temperatures up to 920°C (1690°F), outperforming Alloy 80A. 2. **Good Oxidation Resistance:** The chromium content provides effective resistance to scaling and oxidation in air at high temperatures. 3. **Superior High-Temperature Fatigue Resistance:** Performs well under cyclic loading conditions, which is critical for rotating components like turbine blades. 4. **Precipitation Hardenable:** Gains significant strength from the formation of gamma prime precipitates during aging, offering a high strength-to-weight ratio. 5. **Fabricability and Weldability:** It can be forged, hot-worked, and machined. While it can be welded, it requires careful control and post-weld heat treatment is essential to restore properties and minimize the risk of strain-age cracking. --- ### **Product Applications** NIMONIC Alloy 90 is a critical material in several high-performance industries, particularly for rotating components. * **Aerospace & Jet Engines:** * **Turbine blades and discs** for gas turbine engines. * **Compressor blades,** rings, and seals in the high-pressure stages. * **Fasteners** and bolts for high-temperature sections. * **Industrial Gas Turbines:** * **Blades, vanes,** and other hot-section components in land-based power generation turbines. * **Automotive & Racing:** * **Turbocharger turbines** and components for high-performance and racing engines. * **Industrial Engineering:** * **High-temperature springs** and fasteners. * **Hot-work tooling** and dies for extrusion. ### **Summary** **NIMONIC Alloy 90 (UNS N07090)** is a foundational, precipitation-hardenable nickel-chromium-cobalt superalloy that sets a high standard for **creep resistance and tensile strength at temperatures up to 920°C**. Its well-balanced composition, strengthened by gamma prime precipitates and enhanced by cobalt's solid-solution strengthening, provides a reliable and proven solution for the most demanding rotating components in aerospace propulsion and power generation. Governed by standards like **AMS 5840** and **BS HR 503**, it remains a widely trusted and specified alloy where long-term performance under high stress and temperature is critical, effectively bridging the performance gap between early superalloys and more advanced, costly modern compositions.

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 3313 gallon liquid totes Special package is available on request.