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 added molybdenum and niobium, 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 due to the reinforcement of the nickel and 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, as well as ensuring resistance to thermal fatigue and oxidation.
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The league is governed by several international standards, including:
- ASTM B446 (bars and wires)
- ASTM B443 (sheet and strip)
- 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 |
| Aluminum (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 optimize ductility and corrosion resistance.
- Solution annealing: 2000-2200°F (1093-1204°C) to improve creep resistance.
- Rapid cooling: Indicated for maintaining a homogeneous microstructure and avoiding unwanted precipitation phenomena.
Available formats
INCONEL® Alloy 625 is available in the following forms:
Industrial applications
Thanks to its excellent mechanical resistance and corrosion properties, INCONEL® 625 finds application in several critical sectors:
- Aerospace and Defense: Turbine components, engine exhausts, honeycomb structures, and hydraulic system piping.
- Power Generation: Heat exchangers, boilers and gas turbine systems.
- Chemical and Pharmaceutical Industry: Components for distillation columns, heat exchangers and pipes resistant to aggressive substances.
- Motorsport: High-performance exhaust systems and components for racing engines.
- Nuclear: Nuclear reactor components, steam generators, and control rods.
- Oil & Gas: Subsea pipeline coatings, corrosive hydrocarbon transport equipment, and safety valves.
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