Nickel Alloy Inconel® 625 – Properties, Applications and Technical Data
Inconel 625 is a high-alloy nickel-chromium-molybdenum alloy known for its exceptional corrosion resistance, high strength and excellent performance in extreme temperature environments. The material is developed to withstand aggressive chemical conditions, seawater and high mechanical loads without requiring hardening by heat treatment. Inconel 625 is widely used in energy, marine & offshore, aerospace and chemical process equipment where reliability is essential.
Properties of Inconel 625
Inconel 625 is a solid solution hardened nickel alloy where molybdenum and niobium provide high strength, excellent resistance to crevice and pitting corrosion and very good creep resistance. The material retains its mechanical properties over a wide temperature range and offers good weldability without the risk of cracking.
- Type: Nickel-chromium-molybdenum alloy
- Alloy: Ni-Cr-Mo-Nb (Inconel 625)
- Structure: Austenitic nickel-based alloy
- Designations: Inconel 625, Alloy 625, UNS N06625, Werkstoffnr 2.4856, ASTM B443, ASTM B446, AMS 5666
Advantages
- Exceptional corrosion resistance in aggressive environments
- High strength without the need for heat treatment
- Excellent resistance to crevice and pitting corrosion
- Good weldability and formability
- Stable performance at high temperatures
Limitations
- Higher material cost than standard stainless steels
- Heavier than titanium alloys
- Can be more demanding to machine
Typical applications
Energy & Power generation
Components in turbines, heat exchangers and high temperature systems.
Marine & Offshore
Equipment in seawater environments with high demands on corrosion protection.
Chemical process industry
Reactors, piping and equipment in aggressive chemical environments.
Aerospace industry
High temperature components and structural parts.
Corrosion resistance
Inconel 625 offers superior resistance to chlorides, acids and marine environments. The alloy effectively resists crevice corrosion, pitting corrosion and oxidation attacks even at elevated temperatures.
Environments where Inconel 625 performs well:
- Seawater and chloride environments
- Oxidizing and reducing acids
- High temperature environments
- Corrosive chemical processes
Environments to avoid:
- Extremely sulfur-rich environments at very high temperatures
- Applications where simpler materials provide sufficient performance (cost aspect)
Technical data (annealed condition)
| Yield strength (0.2%): |
~414–550 MPa |
| Tensile strength: |
~827–1034 MPa |
| Elongation at break: |
~30–50% |
| Density: |
~8.44 g/cm³ |
| Modulus of elasticity: |
~207 GPa |
| Thermal conductivity: |
~9.8 W/m·K |
| Recommended maximum temperature: |
≤980°C |
| Weldability: |
Very good – recommended filler material: AWS A5.14 ERNiCrMo-3 |
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- Large stock of nickel alloys
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