What is Inconel 625 LCF?
Inconel 625 LCF (Low Cycle Fatigue) is a specialized, nickel-based superalloy, an enhanced version of standard Inconel 625, engineered for superior resistance to thermal and low-cycle fatigue, making it ideal for bellows, expansion joints, and hot engine parts needing extreme durability under repeated stress and temperature swings. It offers the same high strength, excellent corrosion/oxidation resistance (up to 2000°F), and weldability as the original 625 but with improved fatigue performance for critical components.
What are the equivalent materials for Inconel 625 LCF?
For Inconel 625 LCF (Low Carbon Fatigue), equivalent materials are essentially other forms of Alloy 625 like Inconel 625, Haynes 625, Nickelvac 625, etc., sharing the same Ni-Cr-Mo composition, but specific applications might use Hastelloy C-276 for similar corrosion resistance or Incoloy 825 as a cost-effective alternative; for welding, ERNiCrMo-3 filler metal is used, and other nickel/stainless steels offer different properties.
Inconel 625 LCF Specification
Inconel 625LCF™ Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel, Ni | ≥ 58 |
| Chromium, Cr | 20-23 |
| Molybdenum, Mo | 8-10 |
| Iron, Fe | ≤ 5 |
| Niobium, Nb | 3.15 - 4.15 |
| Carbon, C | ≤ 0.030 |
| Nitrogen, N | ≤ 0.020 |
| Silicon, Si | ≤ 0.020 |
| Phosphorous, P | ≤ 0.015 |
| Sulfur, S | ≤ 0.015 |
Inconel 625LCF™ Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.44 g/cm³ | 0.305 lb/in³ |
| Melting point | 1290-1350°C | 2350-2460°F |
Inconel 625LCF™ Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 769.5 MPa | 111600 psi |
| Yield strength (at strain 0.200%) | 319 MPa | 46300 psi |
| Elastic modulus | 208 GPa | 30200 ksi |
| Shear modulus | 81.4 GPa | 11800 ksi |
| Poisson's ratio | 0.28 | 0.28 |
| Elongation at break | 63% | 63% |
| Hardness, Rockwell B | 84 | 84 |
thermal properties of Inconel 625LCF™ are given below.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (at 21-100°C/69.8-212°F) | 12.8 µm/m°C | 7.11 µin/in°F |
| Thermal conductivity | 9.70W/mK | 67.3 BTU in/hr.ft².°F |
inconel 625 vs inconel 625 lcf
Inconel 625 LCF (Low Cycle Fatigue) is a specialized, fine-grained version of standard Inconel 625, created through controlled vacuum induction melting (VIM) to optimize it for applications with frequent thermal or mechanical stress, like bellows and expansion joints, offering significantly enhanced fatigue life, while standard 625 provides excellent general corrosion resistance for marine/aerospace, but LCF's controlled microstructure makes it superior for cyclic conditions where regular 625 might fail sooner.
Inconel 625 LCF suppliers
At GNEE, Inconel 625 is available in various forms to meet diverse industrial needs:
Plates and Sheets (cold rolled and hot rolled)
Bars and Rods (round, square, hexagonal)
Tubes (seamless and welded)
Wires and Strips (for springs, fasteners, electrical applications)
Forgings and Custom Parts (according to drawings or specifications)
Testing and Documentation: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Testing Reports, Non-Destructive Testing Reports, PMI Test Reports, Visual Inspection Reports, Third-Party Inspection Reports, NABL Certified Laboratory Reports.
Packaging: Wooden crates, bubble wrap, steel strapping, or packaged according to customer requirements.
