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Excellent corrosion & oxidation resistance with strong performance from cryogenic temperatures up to 1800°F (982°C)
Mo + Nb strengthening for high strength and outstanding thermal-fatigue resistance
Available in wide diameter ranges with cut-to-length, machining and fabrication support (per request)
Alloy 625 is a nickel-chromium alloy widely selected for demanding environments where strength, weldability, and corrosion resistance must stay reliable over long service life. It is commonly used in nuclear power, marine engineering, and aerospace applications thanks to its ability to resist oxidation and a broad range of corrosive media.
| Element | Typical Content (wt.%) | Notes |
|---|---|---|
| Nickel (Ni) | ≥ 58% | Base element providing corrosion resistance and high-temperature strength |
| Chromium (Cr) | 20–23% | Improves oxidation resistance and overall corrosion performance |
| Molybdenum (Mo) | 8–10% | Enhances strength and resistance to pitting/crevice corrosion |
| Niobium (Nb) | 3.15–4.15% | Strengthening element that boosts thermal-fatigue resistance |
High strength combined with good fabricability for machining and welding
Strong resistance to oxidation and many corrosive elements
Thermal-fatigue strength across a wide temperature range (cryogenic to 1800°F / 982°C)
| Element | Content |
|---|---|
| Nickel (Ni) | 58% min |
| Chromium (Cr) | 20–23% |
| Molybdenum (Mo) | 8–10% |
| Niobium (Nb) | 3.15–4.15% |
| Iron (Fe) | 5% max |
| Cobalt (Co) | 1% max |
| Silicon (Si) | 0.50% max |
| Phosphorus (P) | 0.15% max |
| Sulfur (S) | 0.15% max |
| Item | Options |
|---|---|
| Product form | Round bar / rounds (commercial lengths or cut-to-length) |
| Processing | Saw cutting, machining, custom packaging (project-based) |
| Common standards for bar/forging stock | ASTM B446 (rod & bar), ASTM B564 (forgings) |
Nuclear power components and systems
Marine engineering hardware exposed to chloride environments
Aerospace parts requiring thermal-fatigue resistance
Chemical processing and corrosion-critical equipment
Q1: What is Alloy 625 (UNS N06625) best used for?
A: It’s commonly chosen for nuclear, marine, aerospace, and chemical processing applications due to its strength and corrosion/oxidation resistance across a wide temperature range.
Q2: What makes Alloy 625 stronger than many other nickel alloys?
A: The alloy is strengthened primarily by molybdenum and niobium, which improve matrix strength and thermal-fatigue performance.
Q3: What temperature range can Alloy 625 handle?
A: It maintains strong thermal-fatigue properties from cryogenic temperatures up to 1800°F (982°C).
Q4: Which standards are commonly used for Alloy 625 round bars?
A: A common specification for rod and bar is ASTM B446, and forgings are often supplied to ASTM B564 (depending on product form and requirement). specialmetals.com
Q5: Can you supply custom diameters and cut lengths?
A: Yes—round bars can be supplied in a wide range of diameters, and we can support custom cut-to-length and processing based on your drawing/spec requirements (MOQ and lead time depend on size and quantity).
Q6: What information do you need for a quotation?
A: Please share diameter, length, quantity, required standard (e.g., ASTM B446), condition, and destination. If you have a drawing, include tolerance and any testing/documents needed.
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