Nickel alloys / UNS N09925
Incoloy® 925 is an age-hardenable version of 825: titanium and aluminium additions give much higher strength while keeping 825's resistance to sour gas and chlorides.
- UNS N09925
- Spec ASTM B805
- Density 8.08 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | N09925 |
| Also known as | Alloy 925 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| Ni | 42.0 | 46.0 |
| Fe | 22.0 | — |
| Cr | 19.5 | 22.5 |
| Mo | 2.5 | 3.5 |
| Cu | 1.5 | 3.0 |
| Ti | 1.9 | 2.4 |
| Al | 0.1 | 0.5 |
| Nb | — | 0.50 |
| C | — | 0.03 |
| Mn | — | 1.0 |
| Si | — | 0.5 |
| S | — | 0.03 |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.08 g/cm³ | 0.292 lb/in³ |
| Magnetic response | Non-magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets & plates | ASTM B168, B443, B409, B424, B127, B162 | 0.3 mm – 6 mm |
| Seamless pipe & tube | ASTM B167, B444, B407, B423, B165, B161 | 1/8" – 24" NB |
| Bars & rods | ASTM B166, B446, B408, B425, B164, B160 | 3 mm – 500 mm |
| Flanges & forgings | ASTM B564 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM B366 | 1/2" – 48" NB |
Corrosion & temperature resistance
Nickel-based alloys resist caustic alkalis, chloride stress-corrosion cracking and many acids, and keep their strength and oxidation resistance at temperatures where stainless steels fail.
Applications
Incoloy® 925: Sour-gas well components, hangers, valves. Chemical and petrochemical plant, sour-gas and oilfield equipment, furnace and heat-treatment hardware, power generation, marine engineering and aerospace components.
Incoloy® 925 vs Incoloy® 825
| Incoloy® 925 | Incoloy® 825 | |
|---|---|---|
| UNS | N09925 | N08825 |
| Key property | Age-hardenable 825 | Acid & sour-gas resistant |
| Typical use | Sour-gas well components, hangers, valves | Sulphuric acid, oil & gas tubing, pickling |
| Cr (wt %) | 19.5–22.5 | 19.5–23.5 |
| Ni (wt %) | 42.0–46.0 | 38.0–46.0 |
| Mo (wt %) | 2.5–3.5 | 2.5–3.5 |
| C (wt %) | ≤ 0.03 | ≤ 0.05 |
| Tensile / yield (min, MPa) | — | 586 / 241 |
Frequently asked questions
What is the UNS number of Incoloy® 925?
Incoloy® 925 is designated UNS N09925.
What is Incoloy® 925 used for?
Age-hardenable 825. Typical uses: sour-gas well components, hangers, valves.
Is Incoloy® 925 magnetic?
Non-magnetic.
In which forms can I buy Incoloy® 925 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dish Ends, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with Incoloy® 925?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Incoloy® 925 and Incoloy® 825?
Incoloy® 925: age-hardenable 825. Incoloy® 825: acid & sour-gas resistant. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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