INCONEL® Alloy 625 is a nickel-chromium-molybdenum-niobium alloy known for its combination of strength, fabricability and corrosion resistance. Molybdenum and niobium strengthen the nickel-chromium matrix, so the alloy does not require precipitation hardening to achieve its characteristic strength. It is used in selected applications requiring resistance to severe corrosive environments, oxidation and mechanical loads.
Application suitability depends on actual service conditions.
The combination of nickel, chromium and molybdenum supports resistance to a range of corrosive environments. The alloy is also noted for resistance to pitting, crevice corrosion and chloride-ion stress-corrosion cracking. Suitability must be evaluated against medium composition, temperature, concentration, flow conditions and design requirements.
INCONEL® Alloy 625 combines strength, ductility and toughness, including relevant low-temperature properties. Mechanical performance varies with product form, dimensions, processing history and delivery condition.
The alloy offers oxidation and scaling resistance at elevated temperatures. Actual service temperature and life depend on the operating environment, stress, exposure time and applicable engineering requirements.
The alloy can be processed and joined using established methods. Forming, machining, welding and any heat-treatment requirements should be determined by product form and intended use.
The following are general industry applications described in manufacturer literature; they do not indicate that Jetwing has supplied these industries or projects.
Selected seawater-contact components, marine equipment and related assemblies where corrosion resistance is an important consideration.
Selected process equipment, heat exchangers, transfer piping, valves and vessels. Material selection depends on the actual process medium and design conditions.
Selected ducts, exhaust systems, bellows, tubing and related components, subject to the applicable material specifications and service conditions.
Selected components for elevated-temperature or corrosive service, subject to verification of alloy performance, product form and applicable specifications.
Composition limits (%)
| Element | Composition Limit (%) |
|---|---|
| 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. (if analyzed) |
Typical reference values
| Property | Typical Reference Value |
|---|---|
| Density | 8.44 g/cm³ |
| Melting Temperature Range | 1290–1350 °C |
| Specific Heat (approx. 21 °C) | 410 J/(kg·°C) |
| Thermal Conductivity (approx. 21 °C) | 9.8 W/(m·°C) |
| Electrical Resistivity (approx. 21 °C) | 129 µΩ·cm |
Reference ranges by product form and condition
| Product Form | Condition | Tensile Strength (MPa) | 0.2% Yield Strength (MPa) | Elongation (%) | Brinell Hardness |
|---|---|---|---|---|---|
| Bars / rods / plates | Rolled | 827–1103 | 414–758 | 30–60 | 175–240 |
| Bars / rods / plates | Annealed | 827–1034 | 414–655 | 30–60 | 145–220 |
| Bars / rods / plates | Solution treated | 724–896 | 290–414 | 40–65 | 116–194 |
| Thin plate / strip | Annealed | 827–1034 | 414–621 | 30–55 | 145–240 |
| Cold-drawn tube / pipe | Annealed | 827–965 | 414–517 | 30–55 | |
| Cold-drawn tube / pipe | Solution treated | 689–827 | 276–414 | 40–60 |
Actual mechanical properties depend on product form, dimensions, processing history and delivery condition. Confirm the required specification and condition for each inquiry.
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