NIMONIC alloy 91 Ni-Cr-Co Alloy,NIMONIC alloy 90，1

### **Product Introduction: NIMONIC® Alloy 91 & NIMONIC® Alloy 90** **NIMONIC® Alloy 91** is an advanced nickel-chromium-cobalt superalloy that represents the evolution of the renowned NIMONIC series, offering enhanced high-temperature performance compared to its predecessor, NIMONIC 90. Both alloys are precipitation-hardenable and designed for exceptional strength and oxidation resistance at elevated temperatures, but Alloy 91 provides improved creep resistance and microstructural stability for the most demanding aerospace and industrial applications. **NIMONIC Alloy 90**, as the established benchmark, continues to be widely used for turbine blades and other critical components, while **Alloy 91** offers extended capabilities for next-generation high-temperature applications. --- ### **Chemical Composition** | Element | NIMONIC 91 Content (%) | NIMONIC 90 Content (%) | |---------|------------------------|------------------------| | **Nickel (Ni)** | Balance | Balance | | **Chromium (Cr)** | 17.0 - 21.0 | 18.0 - 21.0 | | **Cobalt (Co)** | 15.0 - 21.0 | 15.0 - 21.0 | | **Titanium (Ti)** | 2.8 - 3.3 | 2.0 - 3.0 | | **Aluminum (Al)** | 1.3 - 1.8 | 1.0 - 2.0 | | **Molybdenum (Mo)** | 3.5 - 5.0 | - | | **Iron (Fe)** | 2.0 max | 3.0 max | | **Carbon (C)** | 0.08 - 0.16 | 0.13 max | | **Silicon (Si)** | 0.5 max | 1.0 max | | **Manganese (Mn)** | 0.5 max | 1.0 max | | **Copper (Cu)** | 0.2 max | 0.2 max | | **Boron (B)** | 0.003 - 0.010 | - | | **Zirconium (Zr)** | 0.02 - 0.12 | - | --- ### **Physical Properties** | Property | NIMONIC 91 Value | NIMONIC 90 Value | |----------|------------------|------------------| | **Density** | 8.25 g/cm³ | 8.19 g/cm³ | | **Melting Point** | 1360 - 1410 °C | 1350 - 1400 °C | | **Thermal Conductivity** | 12.8 W/m·K | 11.9 W/m·K | | **Electrical Resistivity** | 1.28 μΩ·m | 1.25 μΩ·m | | **Modulus of Elasticity** | 228 GPa | 222 GPa | | **Coefficient of Thermal Expansion** | 13.6 μm/m·°C | 13.5 μm/m·°C | | **Specific Heat Capacity** | 455 J/kg·K | 450 J/kg·K | --- ### **Mechanical Properties** **Room Temperature Properties (Aged Condition):** - **Tensile Strength:** 1200-1400 MPa (91), 1100-1300 MPa (90) - **Yield Strength (0.2% Offset):** 850-1050 MPa (91), 750-900 MPa (90) - **Elongation:** 15-25% (both alloys) - **Hardness:** 35-42 HRC (both alloys) **High-Temperature Performance:** - **Creep Rupture Strength (750°C/100h):** 350 MPa (91), 300 MPa (90) - **Maximum Service Temperature:** 950°C (91), 920°C (90) - **Thermal Fatigue Resistance:** Excellent (both alloys) --- ### **Heat Treatment** **NIMONIC 91 Heat Treatment:** - **Solution Treatment:** 1150-1180°C, 2-4 hours, rapid cool - **Aging:** 800-850°C, 8-16 hours, air cool **NIMONIC 90 Heat Treatment:** - **Solution Treatment:** 1080-1150°C, 2-4 hours, rapid cool - **Aging:** 700-750°C, 16-24 hours, air cool --- ### **Key Characteristics & Advantages** **NIMONIC Alloy 91 Advantages:** 1. Enhanced high-temperature creep resistance 2. Superior microstructural stability 3. Improved oxidation resistance up to 950°C 4. Better stress rupture properties 5. Enhanced fatigue resistance **NIMONIC Alloy 90 Advantages:** 1. Proven reliability in service 2. Excellent balance of strength and ductility 3. Good fabricability and weldability 4. Cost-effective performance 5. Extensive service history --- ### **Product Applications** **Aerospace Industry:** - High-pressure turbine blades (Both alloys) - Turbine disks and rotors (Both alloys) - Combustion chamber components (Both alloys) - Afterburner components (Both alloys) **Industrial Applications:** - Gas turbine components (Both alloys) - High-temperature fasteners (Both alloys) - Nuclear reactor components (91) - Power generation equipment (Both alloys) --- ### **International Standards** | Standard Type | NIMONIC 91 Standard | NIMONIC 90 Standard | |---------------|---------------------|---------------------| | **AMS** | 5895 | 5840 | | **BS** | HR 511 | HR 503 | | **DIN** | 2.4634 | 2.4632 | | **Werkstoff** | 2.4634 | 2.4632 | | **UNS** | N09917 | N07090 | --- ### **Summary** **NIMONIC Alloy 91** represents the continued evolution of nickel-chromium-cobalt superalloy technology, building upon the proven foundation of **NIMONIC Alloy 90**. While both alloys offer exceptional high-temperature performance for critical aerospace and industrial applications, Alloy 91 provides enhanced capabilities through its optimized composition featuring molybdenum addition and controlled precipitation hardening elements. The improved creep resistance, superior microstructural stability, and extended temperature capability of Alloy 91 make it particularly suitable for next-generation gas turbine engines and advanced power generation systems. Both alloys maintain certification to major international standards including AMS, BS, and DIN specifications, ensuring consistent quality and reliability for the most demanding high-temperature applications where performance and durability are paramount.

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 3357 gallon liquid totes Special package is available on request.