When selecting nickel-based alloys for corrosive or high-temperature environments, hardness is an important indicator of a material's wear resistance, deformation resistance, and machinability.Among commonly specified alloys, Inconel 825 and Inconel 625 are frequently compared, especially in chemical processing, oil & gas, and marine applications.
What is Incoloy 825 (UNS N08825)?
Inconel 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. It is primarily designed to provide excellent corrosion resistance, especially in sulfuric and phosphoric acid environments, rather than for maximum mechanical strength. It is suitable for chemical processing equipment, acid production systems, pollution control, and oil and gas pipelines.
What is Inconel 625 (UNS N06625) material?
Inconel 625 is a nickel-chromium-molybdenum alloy with niobium added, primarily strengthened through solid solution strengthening. Compared to Alloy 825, it has higher strength and hardness while maintaining excellent corrosion resistance. It is suitable for offshore oil and gas components, marine engineering, aerospace, and heat exchangers.
inconel 825 vs 625 alloy:hardness
Inconel 625 is noticeably harder than Inconel 825, with a typical hardness of about HB 200–240 (≈ HRC 20–25) due to solid-solution strengthening from Nb and Mo, while Inconel 825 generally measures around HB 140–180 (≈ HRC 10–15), reflecting its softer, more ductile Ni-Fe-Cr alloy structure.
inconel 825 vs 625 alloy: Chemical Composition Comparison (Typical, %)
| Element | Inconel 825 | Inconel 625 |
|---|---|---|
| Ni | 38.0 – 46.0 | ≥ 58.0 |
| Cr | 19.5 – 23.5 | 20.0 – 23.0 |
| Mo | 2.5 – 3.5 | 8.0 – 10.0 |
| Cu | 1.5 – 3.0 | - |
| Nb + Ta | - | 3.15 – 4.15 |
| Fe | Balance | ≤ 5.0 |
inconel 825 vs 625 alloy: Hardness (Typical, Annealed Condition)
| Alloy | Hardness (HB) | Hardness (HRB) |
|---|---|---|
| Inconel 825 | ≤ 200 HB | ~ 90 HRB |
| Inconel 625 | ≤ 220 HB | ~ 95 HRB |
inconel 825 vs 625 alloy:Mechanical properties
| Property | Inconel 825 | Inconel 625 |
|---|---|---|
| Tensile Strength | ≥ 550 MPa | ≥ 827 MPa |
| Yield Strength (0.2%) | ≥ 220 MPa | ≥ 414 MPa |
| Wear resistance | Moderate | Higher |
| Resistance to plastic deformation | Moderate | High |
What is the equivalent of Incoloy 825?
Incoloy 825 is designated as UNS N08825 and Werkstoff Number 2.4858. Alloy 825 also known as Incoloy 825, Inconel 825 & Nickel Alloy Pipe. It is similar to alloy 800 but has improved resistance to aqueous corrosion.
What is the machinability rating of Inconel 625?
Inconel 625 has a very low machinability rating, typically around 12-17% on the AISI Index (compared to free-cutting steel at 100%), making it a challenging superalloy to machine due to rapid work-hardening, high cutting forces, and significant tool wear.
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.
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 feel free to contact us to customize your required product specifications, including shape, condition, surface treatment, and processing techniques.
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