INCONEL® Alloy 625LCF: Comprehensive Product Introduction
Introduction to INCONEL® Alloy 625LCF
INCONEL® alloy 625LCF is a specialized version of INCONEL® alloy 625, tailored for enhanced fatigue resistance, particularly in low-cycle fatigue (LCF) applications. This nickel-based superalloy retains the excellent strength, corrosion resistance, and versatility of standard alloy 625 while offering superior performance under cyclic loading conditions. This article provides a detailed overview of INCONEL® alloy 625LCF, covering its chemical composition, mechanical properties, performance at different temperatures, corresponding grades, industry applications, available forms, sizes, and production standards across various countries.
Chemical Composition of INCONEL® Alloy 625LCF
INCONEL® alloy 625LCF maintains a similar chemical composition to alloy 625, optimized for enhanced fatigue life:
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 58.0 min |
| Chromium (Cr) | 20.0-23.0 |
| Molybdenum (Mo) | 8.0-10.0 |
| Iron (Fe) | 5.0 max |
| Niobium (Nb) | 3.15-4.15 |
| Cobalt (Co) | 1.0 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.50 max |
| Carbon (C) | 0.10 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.015 max |
| Aluminum (Al) | 0.40 max |
| Titanium (Ti) | 0.40 max |
Mechanical Properties of INCONEL® Alloy 625LCF
INCONEL® alloy 625LCF offers excellent mechanical properties suitable for high-stress and cyclic loading applications:
| Property | Value |
|---|---|
| Tensile Strength | 760 MPa (110 ksi) min |
| Yield Strength (0.2% offset) | 345 MPa (50 ksi) min |
| Elongation | 30% min |
| Hardness (Brinell) | 150-240 (varies with heat treatment) |
| Density | 8.44 g/cm³ |
| Fatigue Life | Enhanced LCF performance |
Performance at Different Temperatures
INCONEL® alloy 625LCF exhibits robust performance across a wide range of temperatures:
| Temperature Range | Performance |
|---|---|
| Room Temperature | High strength and corrosion resistance |
| Elevated Temperatures (up to 980°C / 1800°F) | Retains mechanical properties |
| Cryogenic Temperatures | Maintains ductility and toughness |
Corresponding Grades in Different Countries
INCONEL® alloy 625LCF is identified by similar grades as INCONEL® alloy 625 globally:
| Country/Region | Grade |
|---|---|
| USA | UNS N06626 (625LCF) |
| Germany | 2.4856 |
| France | NC22DNB4M (625LCF) |
| UK | NA21 |
| Japan | NCF 625LCF |
| China | GH3625 |
Standard Forms, Sizes, and Production Standards
Forms and Sizes
INCONEL® alloy 625LCF is available in various forms and sizes to meet diverse industrial needs:
| Form | Size Range |
|---|---|
| Sheets | Thickness: 0.1 mm – 50 mm |
| Plates | Thickness: 0.3 mm – 100 mm |
| Bars | Diameter: 5 mm – 300 mm |
| Wire | Diameter: 0.1 mm – 10 mm |
| Tubes | Outer Diameter: 6 mm – 200 mm |
| Pipes | Outer Diameter: 10 mm – 300 mm |
| Fittings | Various configurations as per standards |
| Forgings | Various shapes and sizes as per standards |
Production Standards
INCONEL® alloy 625LCF adheres to international production standards:
| Standard | Description |
|---|---|
| ASTM B443 | Sheets, plates, and strips |
| ASTM B446 | Bars, rods, and wires |
| ASTM B444 | Seamless pipes and tubes |
| ASTM B704 | Welded tubes |
| ASTM B564 | Forgings |
| ASTM B366 | Fittings |
Industry Applications of INCONEL® Alloy 625LCF
INCONEL® alloy 625LCF is utilized in critical applications where fatigue resistance is essential:
- Aerospace: Engine components, turbine discs, and seals.
- Power Generation: Gas turbine components, steam turbine blades.
- Chemical Processing: Equipment handling corrosive chemicals under cyclic loading.
- Marine: Fasteners and springs in marine environments.
- Oil and Gas: Downhole tools, springs, and valve components.
Advantages of INCONEL® Alloy 625LCF
- Enhanced Fatigue Resistance: Improved performance in low-cycle fatigue applications.
- High Strength: Retains strength and toughness at elevated temperatures.
- Corrosion Resistance: Resistant to oxidation and chloride-induced stress corrosion cracking.
- Fabricability: Easily machined, welded, and formed into complex shapes.
Conclusion
INCONEL® alloy 625LCF represents a significant advancement over standard alloy 625, offering enhanced fatigue resistance while maintaining exceptional strength and corrosion resistance. Its wide availability in various forms, adherence to international standards, and proven performance in critical industries make it a preferred choice for applications demanding reliability and durability under cyclic loading conditions.
For detailed technical specifications and further inquiries, referencing specific product data sheets and consulting with manufacturers is recommended.
This comprehensive introduction and detailed data sheet provide a thorough overview of INCONEL® alloy 625LCF, emphasizing its chemical composition, mechanical properties, performance characteristics at different temperatures, applications, and advantages in demanding industrial environments across different countries.