Alloy 625 INCONEL® 625 – W. Nr. 2.4856 / UNS N06625 / ASTM B446, B443, B564
Alloy 625 INCONEL® 625
Alloy 625 INCONEL® 625 is a nickel-chromium alloy with molybdenum and niobium additions, designed to provide high mechanical strength, excellent weldability, and outstanding corrosion resistance in extreme environments. The alloy offers excellent performance across a wide temperature range, from cryogenic conditions up to 982°C.
Its mechanical strength is derived from the reinforcement of the nickel-chromium matrix by molybdenum and niobium, without the need for precipitation hardening treatments. This combination of elements makes INCONEL® 625 highly resistant to corrosion in marine, chemical, and high-temperature environments, while also ensuring resistance to thermal fatigue and oxidation.
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The alloy is governed by several international standards, including:
- ASTM B446 (bars and wires)
- ASTM B443 (sheets and strips)
- ASTM B564 (flanges and forgings)
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 58.0 min |
| Chromium (Cr) | 20.0 – 23.0 |
| Iron (Fe) | 5.0 max |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Niobium + Tantalum (Nb + Ta) | 3.15 – 4.15 |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.50 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.015 max |
| Aluminium (Al) | 0.40 max |
| Titanium (Ti) | 0.40 max |
| Cobalt (Co) | 1.0 max |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 827 – 1034 | 414 – 655 | 60 – 30 |
| 600 | 450 | 176 | 25 |
| 800 | 369 | 149 | 22 |
| 1000 | 319 | 124 | 18 |
Heat treatments
- Standard annealing: 980-1100°C with air cooling to optimise ductility and corrosion resistance.
- Solution treatment: 2000-2200°F (1093-1204°C) to improve creep resistance.
- Rapid cooling: Recommended to maintain a homogeneous microstructure and avoid unwanted precipitation phenomena.
Available forms
INCONEL® Alloy 625 is available in the following forms:
Industrial applications
Thanks to its excellent mechanical strength and corrosion resistance properties, INCONEL® 625 finds application in several critical sectors:
- Aerospace and Defence: Turbine components, engine exhausts, honeycomb structures, and piping for hydraulic systems.
- Power Generation: Heat exchangers, boilers, and gas turbine plants.
- Chemical and Pharmaceutical Industry: Components for distillation columns, heat exchangers, and piping resistant to aggressive substances.
- Motorsport: High-performance exhaust systems and racing engine components.
- Nuclear: Nuclear reactor components, steam generators, and control rods.
- Oil & Gas: Subsea pipeline linings, equipment for transporting corrosive hydrocarbons, and safety valves.
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