Are you choosing between Inconel 625 and Incoloy 825 alloys for corrosive or high-temperature applications? While both are nickel-based alloys with excellent corrosion resistance, they differ fundamentally in their composition, strengthening mechanisms, and service environments.
GNEE supplies certified Inconel 625 and Incoloy 825 tubes, pipes, plates, and bars, and provides technical support to help you select the right alloy for your project.
What is Inconel 625 (UNS N06625)?
Inconel 625 (UNS N06625) is a high-performance, nickel-chromium-molybdenum superalloy known for its exceptional strength, excellent fabricability, and outstanding resistance to corrosion, oxidation, and fatigue across a wide range of extreme temperatures, from cryogenic to very high heat (around 1000°C/1800°F).
What is INCOLOY 825 material?
Incoloy 825 (UNS N08825) is a nickel-iron-chromium alloy containing molybdenum and copper, specifically designed to resist acidic corrosion. It provides stable corrosion resistance in highly corrosive but moderately high-temperature environments. However, its high-temperature strength and creep resistance are lower than Inconel 625, thus limiting its operating temperature to approximately 540-600°C. It is suitable for applications with moderate corrosion and without extreme thermal or mechanical loads.
Inconel 625 vs. 825: Chemical Composition Comparison
| Element | Inconel 625 | Incoloy 825 |
|---|---|---|
| Nickel (Ni) | ≥ 58% | 38–46% |
| Chromium (Cr) | 20–23% | 19.5–23.5% |
| Molybdenum (Mo) | 8–10% | 2.5–3.5% |
| Niobium (Nb) | 3.15–4.15% | – |
| Iron (Fe) | ≤ 5% | ≥ 22% |
| Copper (Cu) | ≤ 0.5% | 1.5–3.0% |
Inconel 625 vs. 825: Mechanical Performance
| Property | Inconel 625 | Incoloy 825 |
|---|---|---|
| Tensile Strength (RT) | ≥ 827 MPa | ≥ 586 MPa |
| Yield Strength (RT) | ≥ 414 MPa | ≥ 241 MPa |
| Strength Mechanism | Solid solution | Solid solution |
| Max Service Temperature | ~980°C | ~540–600°C |
Inconel 625 Vs. 825: Chloride scc Resistance
For chloride stress corrosion cracking (SCC) resistance, Inconel 625 is generally superior, thanks to its higher Nickel/Molybdenum/Niobium content, making it excellent for marine/seawater/halide environments, while Incoloy 825 offers good general chloride resistance but is better suited for acids and milder aqueous solutions, often being more cost-effective for those applications.
Inconel 625 Vs. 825: Welding
Inconel 625 offers superior strength and high-temp corrosion resistance (great for aerospace/power), while Incoloy 825 excels in strong acid/chloride environments (chemical processing/oil & gas) with better cost-efficiency for those uses, but Inconel 625 welds more easily due to its higher nickel content, with Filler Metal 625 (ERNiCrMo-3) being a go-to for joining both alloys and providing excellent weld properties.
Is Inconel 825 magnetic?
Inconel 825 is typically non-magnetic. This alloy is a nickel-iron-chromium blend with additions of molybdenum, copper, and titanium, which contribute to its overall corrosion resistance and maintain its non-magnetic nature.
What are the differences between INCOLOY 825 and SS316?
INCOLOY 825 is ideal for highly corrosive, high-temperature environments or applications requiring resistance to stress corrosion cracking. On the other hand, SS316 is ideal for applications requiring good resistance to general corrosion and pitting corrosion.
who choose us?
GNEE currently has Inconel 625 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 contact us to customize your required product specifications, including shape, condition, surface treatment, and processing techniques.
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