Alloy 625 (NO6625) is a low-carbon nickel-chromium-molybdenum-niobium alloy built for tough environments. It resists various corrosive media and retains excellent mechanical properties. Moreover, Inconel 625 prevents pitting, crevice corrosion, and intergranular corrosion effectively. It excels against alkalis, organic acids, and inorganic acids like nitric, phosphoric, sulfuric, and hydrochloric acid.
This alloy offers strong high-temperature performance and resists chloride-induced stress corrosion cracking.
Chemical Composition of Alloy 600
| Element | Ni | Cr | Mo | Nb | Fe | C | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Content (%) | ≥≥58.0 | 20.0-23.0 | 8.0-10.0 | 3.15-4.15 | ≤5.0 | ≤0.10 | ≤0.50 | ≤0.50 | ≤0.015 | ≤0.015 |
Core Advantages of Alloy 600
Alloy 625 has exceptional mechanical strength and is stable over a wide range of temperatures, from low to high. It can also withstand enormous stresses and heavy loads without deformation.
Their high nickel content makes them immune to reducing acids such as hydrochloric and sulfuric acids. Chromium and molybdenum, on the other hand, can deal with oxidizing acids such as nitric and phosphoric acid.
Alloy 625 is not subject to localized corrosion. The molybdenum and niobium in its composition form a protective layer against pitting and crevice corrosion, even in environments with a high chloride content such as seawater.
While many alloys crack under the combined effects of mechanical stress and chlorides, Inconel 625 is unaffected. Its high nickel and molybdenum content prevents crack formation and provides unrivaled resistance to chloride stress corrosion cracking.
The chromium-rich composition of Inconel 625 makes it shine in terms of oxidation resistance. When exposed to high temperatures, chromium forms a tight, protective oxide layer on the surface, preventing further degradation.
Mechanical Properties of Alloy 625
| Property | Tensile Strength (Rm) | Yield Strength (Rp0.2) | Elongation (A) | Hardness (HB) |
|---|---|---|---|---|
| Value | ≥827 MPa | ≥414 MPa | ≥30% | ≤220 |
Applications of Alloy 625
- Offshore Technology: Creates seawater-resistant equipment.
- Shipbuilding: Produces corrosion-proof hull parts.
- Mineral Acid Production: Manages harsh acid conditions.
- Oil and Gas: Handles high-temperature, high-pressure tasks.
- Flue Gas Cleaning Systems: Withstands corrosive gases.
Material Standards for Alloy 625
- Material Number: 2.4856
- UNS Number: N06625
- ASTM: B446 / B564
- VDTÜV: 499
- DIN: 17744 / 17752 / EN 10095
Solution Annealing for Alloy 625
| Parameter | Value |
|---|---|
| Temperature | 980-1150°C |
| Cooling Method | Rapid cooling (air or water) |
Comparison with Other Materials
Future Outlook
Demand for corrosion-resistant, high-strength materials has increased the potential of Inconel 625. Technological advances will soon improve performance and reduce costs. At the same time, growth in the fields of renewable energy and environmental protection will open new doors for alloy 625.
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