Product Code : NI-NI107-CU-CU
Alloy 909,Incoloy 909,UNS N19909is available in Bar (Round bar, Flat bar), Ribbon, Wire, Rods, Tube, Pipe, Foil, Plate, Sheet, Strip and Forging Stock.
### **Alloy 909 / INCOLOY® 909 (UNS N19909) - Technical Datasheet**
--- #### **1. Overview** **INCOLOY® 909** is a low thermal expansion, precipitation-hardenable superalloy designed to maintain high strength and dimensional stability over a wide temperature range from -250°C to 550°C (-418°F to 1022°F). This nickel-iron-cobalt alloy exhibits a uniquely low and predictable coefficient of thermal expansion, making it ideal for applications requiring close tolerances under varying thermal conditions.
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### **Alloy 909 / INCOLOY® 909 (UNS N19909) - Technical Datasheet**
--- #### **1. Overview** **INCOLOY® 909** is a low thermal expansion, precipitation-hardenable superalloy designed to maintain high strength and dimensional stability over a wide temperature range from -250°C to 550°C (-418°F to 1022°F). This nickel-iron-cobalt alloy exhibits a uniquely low and predictable coefficient of thermal expansion, making it ideal for applications requiring close tolerances under varying thermal conditions.
--- #### **2. Chemical Composition (Weight %)
** The composition is precisely controlled for thermal expansion management and precipitation hardening.
| Element | Content (%) | Role & Benefit |
|---------|-------------|----------------|
| **Nickel (Ni)** | 35.0 - 40.0 | Controls thermal expansion characteristics |
| **Iron (Fe)** | Balance | Base element of the alloy matrix |
| **Cobalt (Co)** | 12.0 - 16.0 | Enhances strength and thermal stability |
| **Niobium (Nb)** | 4.2 - 5.2 | Primary precipitation hardening element |
| **Titanium (Ti)** | 1.3 - 1.8 | Secondary precipitation hardening element |
| **Silicon (Si)** | 0.25 - 0.50 | Improves oxidation resistance |
| **Aluminum (Al)** | 0.03 max | Controlled to minimize hardening |
| **Manganese (Mn)** | 0.50 max | Controlled impurity |
| **Carbon (C)** | 0.04 max | Controlled for optimal properties |
| **Sulfur (S)** | 0.015 max | Controlled impurity |
| **Copper (Cu)** | 0.50 max | Controlled impurity |
*Note: "INCOLOY" is a registered trademark of Special Metals Corporation*
--- #### **3. Physical Properties**
The physical properties demonstrate exceptional thermal stability.
| Property | Value |
|----------|-------|
| **Density** | 8.25 g/cm³ (0.298 lb/in³) |
| **Melting Point** | 1400-1440°C (2550-2625°F) |
| **Specific Heat (20°C)** | 460 J/kg·K |
| **Thermal Conductivity** | 12.0 W/m·K (at 20°C) |
| **Mean Coefficient of Thermal Expansion** | **7.9 × 10⁻⁶/°C (20-200°C)**
**8.9 × 10⁻⁶/°C (20-400°C)**
**9.9 × 10⁻⁶/°C (20-550°C)** |
| **Electrical Resistivity** | 1.05 μΩ·m |
| **Modulus of Elasticity** | 172 GPa (25.0 × 10⁶ psi) |
| **Magnetic Permeability** | Essentially non-magnetic |
--- #### **4. Mechanical Properties**
The alloy develops high strength through precipitation hardening while maintaining low thermal expansion.
**Solution Annealed Condition:**
| Property | Value |
|----------|-------|
| **Tensile Strength** | 830-1000 MPa (120-145 ksi) |
| **Yield Strength (0.2% Offset)** | 480-620 MPa (70-90 ksi) |
| **Elongation** | 25-35% |
| **Hardness** | 26-34 HRC |
**Aged Condition (720°C/1325°F for 8 hours):
| Property | Value |
|----------|-------|
| **Tensile Strength** | 1380-1520 MPa (200-220 ksi) |
| **Yield Strength** | 1240-1380 MPa (180-200 ksi) |
| **Elongation** | 8-15% |
| **Hardness** | 40-46 HRC |
**Elevated Temperature Properties (540°C/1000°F):**
| Property | Value |
|----------|-------|
| **Tensile Strength** | 1030 MPa (150 ksi) |
| **Yield Strength** | 930 MPa (135 ksi) |
| **Creep Strength (1000h)** | 480 MPa (70 ksi) | -
-- #### **5. Heat Treatment**
**Solution Treatment:
** 980°C (1800°F) for 1 hour, rapid cool
**Aging Treatment:
** 720°C (1325°F) for 8 hours, furnace cool to 620°C (1150°F) at 55°C (100°F) per hour, air cool
**Stress Relieving:
** 650°C (1200°F) for 2 hours
--- #### **6. Product Applications**
**INCOLOY 909** serves in critical applications requiring dimensional stability:
- **Aerospace Industry:**
- Gas turbine engine seals and rings
- Compressor and turbine casings
- Missile guidance systems
- Satellite structural components
- **Power Generation:**
- Steam turbine components
- Gas turbine seals
- Generator retaining rings
- Power transmission systems
- **Precision Instruments:**
- Laser system housings
- Optical mounting frames
- Metrology equipment
- Precision measuring instruments
- **Automotive Industry:**
- Turbocharger components
- High-performance engine parts
- Advanced transmission systems
- **Specialized Applications:**
- Cryogenic equipment
- Thermal management systems
- High-precision mechanisms
- Dimensionally critical structures
--- #### **7. International Standards**
The material conforms to various international specifications:
| Standard | Specification |
|----------|---------------|
| **ASTM** | ASTM B637 - Precipitation Hardening Nickel Alloy Bars, Forgings, and Forging Stock |
| **UNS** | UNS N19909 |
| **AMS** | AMS 5547 (Sheet, Strip, Plate) AMS 5548 (Bar and Forgings) |
| **Aerospace** | AMS 5547, AMS 5548 |
| **European** | EN 10295 - NiFe34Co29Nb5 | -
-- #### **8. Special Characteristics**
- **Ultra-Low Thermal Expansion:** One of the lowest expansion coefficients among high-strength alloys
- **High Strength-to-Weight Ratio:** Excellent mechanical properties
- **Thermal Stability:** Maintains dimensions over wide temperature ranges
- **Cryogenic Performance:** Suitable for extreme low-temperature applications
- **Fatigue Resistance:** Excellent resistance to thermal and mechanical fatigue
--- #### **9. Fabrication Characteristics**
- **Machining:** Best performed in solution annealed condition
- **Welding:** Good weldability using GTAW with matching filler metal
- **Forming:** Good hot working characteristics; requires care in cold forming
- **Heat Treatment:** Critical control of aging parameters required
- **Grinding:** Suitable for precision grinding operations -
-- #### **10. Thermal Expansion Performance
** The alloy's thermal expansion behavior is exceptionally consistent:
- **-250°C to 20°C:** 5.5 × 10⁻⁶/°C
- **20°C to 200°C:** 7.9 × 10⁻⁶/°C
- **20°C to 400°C:** 8.9 × 10⁻⁶/°C
- **20°C to 550°C:** 9.9 × 10⁻⁶/°C
This predictable expansion behavior allows for precise engineering in thermally dynamic environments.
--- #### **11. Summary**
**INCOLOY® 909 (UNS N19909)** represents an advanced low thermal expansion superalloy that combines exceptional dimensional stability with high strength across an extensive temperature range. Its carefully balanced composition enables reliable performance in applications where thermal mismatch must be minimized while maintaining structural integrity. The alloy's unique capability to preserve precise dimensions from cryogenic temperatures up to 550°C, coupled with its precipitation-hardening characteristics, makes it indispensable for aerospace, power generation, and precision instrumentation applications. Governed by rigorous standards including AMS 5547-5548 and ASTM specifications, INCOLOY 909 continues to be the material of choice for engineering challenges where thermal dimensional stability and mechanical reliability are simultaneously required.
Packing of INCOLOY® 909 (UNS N19909)
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 1730 gallon liquid totes Special package is available on request.
