What is Inconel 625 LCF material?
Inconel 625LCF is a specialized version of the nickel-based superalloy Inconel 625, with "LCF" standing for Low Cycle Fatigue, meaning it's engineered for superior resistance to thermal fatigue and repeated stress cycles, making it ideal for components like bellows, expansion joints, and aircraft exhaust systems, while retaining the high strength, corrosion resistance, and toughness of standard 625 alloy from cryogenic to high temperatures (around 2000°F).
Is Inconel 625 LCF the same as alloy 625?
No, Inconel 625 LCF (Low Cycle Fatigue) is a specialized, higher-performance version of standard Alloy 625, sharing the same core chemistry but with tighter controls on elements like Carbon, Silicon, and Nitrogen, plus specialized processing for enhanced fatigue life, making it ideal for bellows and critical components needing many stress cycles.
chemical composition of Inconel 625LCF
| Element | Content (%) |
|---|---|
| Nickel, Ni | ≥ 58 |
| Chromium, Cr | 20-23 |
| Molybdenum, Mo | 8-10 |
| Iron, Fe | ≤ 5 |
| Niobium, Nb | 3.15 - 4.15 |
| Cobalt, Co | ≤ 1 |
| Manganese, Mn | ≤ 0.50 |
| Titanium, Ti | ≤ 0.40 |
| Aluminum, Al | ≤ 0.40 |
| Carbon, C | ≤ 0.030 |
Inconel 625LCF Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.44 g/cm³ | 0.305 lb/in³ |
| Melting point | 1290-1350°C | 2350-2460°F |
mechanical properties of annealed Inconel 625LCF
| 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
| 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 625LCF Fatigue Resistance
Inconel 625LCF exhibits excellent low-cycle fatigue (LCF) resistance, maintaining structural integrity under repeated thermal and mechanical loading. Tests show that it can withstand up to 10,000 cycles at 650°C without significant crack initiation, making it ideal for high-temperature components in aerospace, power generation, and petrochemical applications where cyclic stresses are critical.
Inconel 625LCF High Strength
This alloy maintains exceptional tensile strength at elevated temperatures, with a typical ultimate tensile strength of ≥ 827 MPa at room temperature and ≥ 620 MPa at 650°C. Its solid solution and precipitation strengthening mechanisms provide consistent performance under static and dynamic loads, ensuring reliability for high-pressure piping, turbine components, and high-stress mechanical parts.
Inconel 625LCF Corrosion & Oxidation
Inconel 625LCF offers outstanding corrosion and oxidation resistance, especially in harsh chemical and marine environments. Its molybdenum and niobium content allows it to resist pitting and crevice corrosion in chloride-rich media, while forming a stable oxide layer that prevents high-temperature oxidation up to 980°C, extending component service life in aggressive atmospheres.
What is the difference between Inconel 625 and alloy 600?
Inconel 600 is a high-nickel alloy for high-temp oxidation, while Inconel 625 adds molybdenum and niobium, giving it superior strength and corrosion resistance, especially in marine/acidic conditions, making 625 better for severe chemical/aerospace use but more costly, whereas 600's simpler Ni-Cr-Fe mix suits heat exchangers and less aggressive environments.
GNEE currently has Inconel 625LCF products in stock, including: plates, sheets, coils, strips, tubes, bars, and wires. In addition, we offer a variety of surface finishes for you to choose from, such as: No. 1, 2B, 2D, BA, No. 3, No. 4, HL, No. 8, sandblasting, etc.
We guarantee 100% quality. We will never deliver any defective products to our customers. Please feel free to contact us to customize your required product specifications, including shape, condition, surface treatment, and processing methods.
