INCONEL 625LCF Nickel Superalloy (UNS N06626) ，1

### **Product Introduction: INCONEL® 625LCF™ (UNS N06626)** **INCONEL® 625LCF™** is a specialized nickel-chromium-molybdenum-niobium alloy specifically engineered for enhanced low-cycle fatigue (LCF) performance. While maintaining the excellent corrosion resistance and high-strength characteristics of standard INCONEL 625, this variant features optimized chemistry and processing to deliver superior resistance to thermal and mechanical fatigue in applications involving cyclic loading conditions. The "LCF" designation indicates the alloy's exceptional performance in low-cycle fatigue environments, making it particularly suitable for components subjected to repeated thermal cycling, mechanical vibrations, and other cyclic stress conditions where traditional alloys might experience premature failure. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 58.0 min | | **Chromium (Cr)** | 20.0 - 23.0 | | **Molybdenum (Mo)** | 8.0 - 10.0 | | **Niobium (Nb)** | 3.15 - 4.15 | | **Iron (Fe)** | 5.0 max | | **Titanium (Ti)** | 0.40 max | | **Aluminum (Al)** | 0.40 max | | **Carbon (C)** | 0.03 max | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Phosphorus (P)** | 0.015 max | | **Sulfur (S)** | 0.015 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.44 g/cm³ | | **Melting Point** | 1290-1350 °C | | **Thermal Conductivity** | 9.8 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.29 μΩ·m | | **Modulus of Elasticity** | 207 GPa | | **Coefficient of Thermal Expansion** | 12.8 μm/m·°C (20-100°C) | | **Specific Heat Capacity** | 410 J/kg·K | | **Magnetic Permeability** | <1.001 | --- ### **Mechanical Properties** **Room Temperature Properties (Annealed):** - **Tensile Strength:** 827 MPa - **Yield Strength (0.2% Offset):** 414 MPa - **Elongation:** 30% min - **Reduction of Area:** 40% min - **Hardness:** 90 HRB max **Fatigue Performance:** - **Low-Cycle Fatigue Life:** 3-5x improvement over standard 625 - **Fatigue Crack Growth Rate:** Significantly reduced - **Thermal Fatigue Resistance:** Excellent --- ### **Key Characteristics & Advantages** 1. **Enhanced Low-Cycle Fatigue Performance** - Superior resistance to thermal and mechanical fatigue - Optimized microstructure for cyclic loading conditions - Improved crack initiation resistance 2. **Excellent Corrosion Resistance** - Maintains all corrosion resistance properties of standard 625 - Outstanding resistance to pitting and crevice corrosion - Good performance in acidic and chloride environments 3. **Controlled Microstructure** - Fine-grained structure for improved fatigue life - Optimized precipitation behavior - Enhanced damage tolerance 4. **Good Fabricability** - Weldable using conventional methods - Suitable for hot and cold working - Compatible with standard machining processes --- ### **Product Applications** **Aerospace Industry:** - Gas turbine engine components - Exhaust system parts - Mounting brackets and supports - Engine structural components **Power Generation:** - Gas turbine components - Heat recovery system parts - Steam turbine elements - Power plant structural supports **Automotive Industry:** - Turbocharger components - Exhaust manifolds - High-temperature fasteners - Engine mounting systems **Industrial Applications:** - Process equipment subjected to thermal cycling - Expansion bellows - Heat exchanger components - Chemical processing equipment --- ### **International Standards** | Standard Type | Standard Number | Product Form | |---------------|-----------------|--------------| | **UNS** | N06626 | Unified Numbering System | | **AMS** | 5666 | Bar, Forgings, and Rings | | **ASTM** | B443 | Plate, Sheet, and Strip | | **ASTM** | B444 | Seamless Pipe and Tube | | **ASTM** | B446 | Rod and Bar | | **ASME** | SB-443, SB-444 | Code Cases | | **DIN** | 2.4856 | Material Number | --- ### **Summary** **INCONEL® 625LCF™ (UNS N06626)** represents a significant advancement in nickel-based superalloy technology, specifically optimized for applications requiring exceptional low-cycle fatigue performance. While preserving the outstanding corrosion resistance and mechanical properties of standard INCONEL 625, this specialized variant delivers dramatically improved fatigue life and crack resistance under cyclic loading conditions. The alloy's enhanced microstructure and optimized chemistry make it particularly valuable for components subjected to repeated thermal cycling, mechanical vibrations, and other fatigue-inducing conditions in aerospace, power generation, and automotive applications. Certification to major international standards including AMS, ASTM, and ASME specifications ensures consistent quality and reliability, providing engineers with a superior material solution for demanding applications where fatigue resistance and long-term durability are critical requirements.

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 3331 gallon liquid totes Special package is available on request.