Alloy 907,Incoloy 907,UNS N19907,EFORU

### **Technical Datasheet: Alloy 907 (Incoloy 907, UNS N19907)** 

 **Overview

** Incoloy 907 (Alloy 907, UNS N19907) is a low thermal expansion, precipitation-hardenable iron-nickel-cobalt superalloy specifically developed for high-temperature applications requiring controlled thermal expansion characteristics. This unique alloy maintains excellent strength and stability while exhibiting low thermal expansion behavior, making it particularly suitable for gas turbine seals and other components where dimensional stability is critical. 

### **Technical Datasheet: Alloy 907 (Incoloy 907, UNS N19907)** 

 **Overview

** Incoloy 907 (Alloy 907, UNS N19907) is a low thermal expansion, precipitation-hardenable iron-nickel-cobalt superalloy specifically developed for high-temperature applications requiring controlled thermal expansion characteristics. This unique alloy maintains excellent strength and stability while exhibiting low thermal expansion behavior, making it particularly suitable for gas turbine seals and other components where dimensional stability is critical. 

 **Key Characteristics** - 

**Controlled low thermal expansion coefficient** - 

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

**Good oxidation resistance up to 650°C** - 

**Outstanding thermal fatigue resistance** - 

**Maintains dimensional stability under thermal cycling** 

1. Chemical Composition (Weight %)

** | Element | Composition (%) |

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

| **Nickel (Ni)** | 35.0-40.0 |

| **Cobalt (Co)** | 12.0-16.0 |

| **Iron (Fe)** | Balance |

| **Niobium (Nb)** | 4.3-5.2 | 

| **Titanium (Ti)** | 1.3-1.8 |

 | **Silicon (Si)** | ≤0.25 |

 | **Manganese (Mn)** | ≤0.25 |

 | **Carbon (C)** | ≤0.06 | 

| **Aluminum (Al)** | ≤0.20 |

 | **Boron (B)** | 0.003-0.012 |

 | **Sulfur (S)** | ≤0.015 | 

| **Phosphorus (P)** | ≤0.020 | 

2. Physical Properties** 

 | Property | Value |

 |----------|-------| 

| **Density** | 8.25 g/cm³ |

 | **Melting Range** | 1380-1430°C | 

| **Thermal Conductivity** | 14.5 W/m·K |

 | **Specific Heat** | 480 J/kg·K |

 | **Mean Coefficient of Thermal Expansion** | 8.5-9.5 μm/m·°C (20-400°C) | 

| **Modulus of Elasticity** | 180 GPa | 

3. Mechanical Properties** **

Room Temperature (Aged Condition):** - 

**Tensile Strength**: 1100-1300 MPa - 

**Yield Strength (0.2% Offset)**: 850-1000 MPa - 

**Elongation**: 10-15% - 

**Reduction of Area**: 15-25% 

 **Elevated Temperature (650°C):** - 

**Tensile Strength**: ~800 MPa - 

**Yield Strength**: ~650 MPa - 

**Excellent creep strength** under thermal cycling conditions

4. International Standards

| Product Form | Standard |

 |--------------|----------| 

| **Bar & Forgings** | AMS 5874 | 

| **Sheet, Strip, Plate** | AMS 5872 |

 | **Wire** | AMS 5873 | | 

**Billet** | AMS 5871 | 

| **Unified Numbering System** | UNS N19907 | --- #### **

5. Applications** 

 **Aerospace Industry:** - 

Gas turbine seal segments 

- Turbine shroud rings 

- Compressor casings 

- Jet engine components requiring dimensional stability 

 **Power Generation:** 

- Gas turbine seals and shrouds

 - Steam turbine components 

- High-temperature fasteners 

- Turbine clearance control systems 

 **Specialized Applications:** 

- Glass molding equipment 

- Precision measurement instruments 

- Thermal compensation elements 

- Cryogenic components 

 **Industrial Gas Turbines:** 

- Turbine casing components 

- Seal support structures 

- High-temperature springs 

- Expansion joints --- 

 **Summary** 

Incoloy 907 (UNS N19907) is a specialized low thermal expansion superalloy that offers a unique combination of high-temperature strength and controlled thermal expansion behavior. Its carefully balanced composition, featuring iron-nickel-cobalt with niobium and titanium additions, provides excellent mechanical properties while maintaining dimensional stability under thermal cycling conditions. This makes it particularly valuable for gas turbine seal applications and other components where close tolerances must be maintained during temperature variations. The alloy's proven performance in demanding aerospace and power generation applications has established it as a critical material for components requiring reliable operation in thermal cycling environments.

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 1649 gallon liquid totes Special package is available on request.