Alloy 901,Incoloy 901,UNS N09901,EFORU

### **Technical Datasheet: Alloy 901 (Incoloy 901, UNS N09901)** 

 **Overview** Incoloy 901 (Alloy 901, UNS N09901) is a precipitation-hardenable nickel-iron-chromium superalloy designed for high-temperature service up to 815°C (1500°F). This age-hardenable alloy combines excellent high-temperature strength with good oxidation resistance and fabricability, making it particularly suitable for gas turbine components and high-temperature fasteners in aerospace and power generation industries. 

 **Key Characteristics** - 

**Excellent high-temperature strength and creep resistance** - 

**Good oxidation resistance up to 815°C** - 

**Outstanding fatigue and rupture properties** - 

**Good thermal stability and microstructural control** - 

**Excellent strength-to-weight ratio at elevated temperatures** 

### **Technical Datasheet: Alloy 901 (Incoloy 901, UNS N09901)** 

 **Overview** Incoloy 901 (Alloy 901, UNS N09901) is a precipitation-hardenable nickel-iron-chromium superalloy designed for high-temperature service up to 815°C (1500°F). This age-hardenable alloy combines excellent high-temperature strength with good oxidation resistance and fabricability, making it particularly suitable for gas turbine components and high-temperature fasteners in aerospace and power generation industries. 

 **Key Characteristics** - 

**Excellent high-temperature strength and creep resistance** - 

**Good oxidation resistance up to 815°C** - 

**Outstanding fatigue and rupture properties** - 

**Good thermal stability and microstructural control** - 

**Excellent strength-to-weight ratio at elevated temperatures** 

 --- #### **1. Chemical Composition (Weight %)** 

 | Element | Composition (%) | 

|---------|-----------------|

 | **Nickel (Ni)** | 40.0-45.0 | 

| **Chromium (Cr)** | 11.0-14.0 | 

| **Iron (Fe)** | Balance | 

| **Molybdenum (Mo)** | 5.0-6.5 | 

| **Titanium (Ti)** | 2.8-3.1 |

| **Carbon (C)** | 0.05-0.10 | 

| **Aluminum (Al)** | ≤0.30 | 

| **Manganese (Mn)** | ≤0.50 | 

| **Silicon (Si)** | ≤0.50 | 

| **Copper (Cu)** | ≤0.50 | 

| **Boron (B)** | 0.01-0.02 | 

| **Zirconium (Zr)** | ≤0.10 | 

| **Sulfur (S)** | ≤0.015 | 

2. Physical Properties**

 | Property | Value | 

|----------|-------| 

| **Density** | 8.21 g/cm³ (0.296 lb/in³) | 

| **Melting Range** | 1360-1410°C (2480-2570°F) | 

| **Thermal Conductivity** | 14.0 W/m·K (9.7 BTU·in/hr·ft²·°F) | 

| **Specific Heat** | 460 J/kg·K (0.11 BTU/lb·°F) | 

| **Mean Coefficient of Thermal Expansion** | 13.5 μm/m·°C (20-100°C) | 

| **Modulus of Elasticity** | 210 GPa (30.5×10⁶ psi) | 

3. Mechanical Properties** 

 **Room Temperature (Solution Treated and Aged):** - 

**Tensile Strength**: 1000-1200 MPa (145-175 ksi) - 

**Yield Strength (0.2% Offset)**: 700-900 MPa (100-130 ksi) - 

**Elongation**: 10-20% - 

**Reduction of Area**: 15-25% 

 **Elevated Temperature (650°C/1200°F):** - 

**Tensile Strength**: ~850 MPa (123 ksi) - 

**Yield Strength**: ~650 MPa (94 ksi) - 

**Creep Rupture Strength** (1000 hours): Excellent

4. International Standards**

 | Product Form | Standard | 

|--------------|----------| 

| **Bar, Wire, Forgings** | AMS 5660, ASTM B637 |

 | **Plate, Sheet, Strip** | AMS 5661 |

 | **Billet and Reforging Stock** | AMS 5762 |

 | **Wire for Fasteners** | AMS 5832 |

 | **European Standard** | EN 10095 |

 | **Unified Numbering System** | UNS N09901 | 

 5. Applications** 

 **Aerospace Industry:** 

- Gas turbine discs and blades 

- Turbine shafts and rotors 

- Compressor components 

- Jet engine structural parts 

- Afterburner components 

 **Power Generation:** 

- Gas turbine blades and discs 

- Turbine wheels and shafts 

- High-temperature bolts and fasteners 

- Steam turbine components 

 **Industrial Gas Turbines:** 

- Turbine discs and wheels 

- Compressor sections 

- High-temperature fasteners 

- Rotating components 

 **Other Applications:** 

- Turbocharger components 

- High-temperature springs 

- Nuclear reactor components 

- Heat treatment fixtures --- 

 **Summary** 

Incoloy 901 (UNS N09901) represents a high-performance nickel-iron-based superalloy that delivers an outstanding combination of high-temperature strength, creep resistance, and oxidation resistance. The alloy's precipitation-hardening characteristics, achieved through precise control of titanium, aluminum, and molybdenum content, make it particularly valuable for critical rotating components in gas turbine engines. Its ability to maintain excellent mechanical properties at temperatures up to 815°C, combined with good thermal stability and fabricability, has established it as a preferred material for aerospace, power generation, and industrial applications where reliability at extreme temperatures is paramount. The alloy meets stringent international standards and continues to be specified for demanding high-temperature components worldwide.

Packing of  Incoloy 901 (UNS N09901)

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 1648 gallon liquid totes Special package is available on request.