Physical properties
| Density | 8.08 | g/cm³ |
Informative values: they vary with composition, condition and test method. Use the governing standard or measured mill data for pressure and heat-transfer calculations.
Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements7 elements | |||
| Ni | Nickel | 42 – 46% | |
| Fe | Iron | ≥ 22% | |
| Cr | Chromium | 19.5 – 22.5% | |
| Mo | Molybdenum | 2.5 – 3.5% | |
| Cu | Copper | 1.5 – 3% | |
| Ti | Titanium | 1.9 – 2.4% | |
| Al | Aluminium | 0.1 – 0.5% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual6 elements | |||
| Nb | Niobium | ≤ 0.5% | |
| C | Carbon | ≤ 0.03% | |
| Mn | Manganese | ≤ 1% | |
| Si | Silicon | ≤ 0.5% | |
| P | Phosphorus | ≤ 0.03% | |
| S | Sulphur | ≤ 0.03% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Tube and pipe | |||||
| Seamless pipe and tube | Solution annealed, aged | ≥ 965 (140 ksi) | ≥ 758 (110 ksi) | ≥ 18 | Also specified: Hardness ≤ 38 HRC Hardness ≤38 HRC. |
| Several forms | |||||
| Bar and wire | Solution treated, as delivered | ≥ 517 (75 ksi) | ≥ 241 (35 ksi) | ≥ 35 | Also specified: Reduction of area Z ≥ 50 % Supplied solution-treated by default; listed values apply after ageing. |
| Bar and wire | Cold-worked, solution annealed, aged | ≥ 965 (140 ksi) | ≥ 724 (105 ksi) | ≥ 18 | Also specified: Reduction of area Z ≥ 25 % · Hardness ≤ 346 HBW Applies to 15.9–76.2 mm; hardness ≤346 HBW (38 HRC). |
| Bar and wire | Hot-worked, solution annealed, aged | ≥ 965 (140 ksi) | ≥ 758 (110 ksi) | ≥ 18 | Also specified: Reduction of area Z ≥ 25 % · Hardness ≤ 346 HBW Applies to 25.4 mm and over; hardness ≤346 HBW (38 HRC). |
Hardness requirement
Required by the standard — ≤ 346 HB (38 HRC max)
A maximum, not a minimum.
More detail 2
Two size bands apply: cold worked + solution annealed and aged, 15.9–76.2 mm, yield ≥724 MPa; hot worked + solution annealed and aged, 25.4 mm and over, yield ≥758 MPa.
The hardness ceiling is the same for both.
Stress-rupture requirement
No stress-rupture test is required for this grade. A certificate carrying no rupture data is compliant and is not grounds for rejection.
Where this grade is recommended
Matched in 3 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Packers & downhole tools | Oil & Gas | > 230 °C | 1 / 7 | 90 |
| Wellhead & Christmas tree | Oil & Gas | ≤ 120 °C | 4 / 7 | 89 |
| Valves, fittings & flanges | Oil & Gas | > 300 °C | 5 / 14 | 85 |
Designations & equivalents
| Trade name(s) | Incoloy 925 |
| ASTM / AISI | B637 / B805 / B983 |
| NACE sour service | ISO 15156-3: solution-annealed and aged ≤38 HRC |
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
3 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is Alloy 925 · UNS N09925?
Alloy 925 · UNS N09925 — Ni corrosion-resistant. Age-hardened corrosion-resistant — oil & gas downhole tools and valves
What is the maximum service temperature of N09925?
Typically about 540 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N09925?
The specified minimum tensile strength is 965 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover N09925?
ASTM B805, ASTM B637, ASTM B983
Where is N09925 typically used?
Packers & downhole tools (Oil & Gas); Wellhead & Christmas tree (Oil & Gas); Valves, fittings & flanges (Oil & Gas)
In which forms is N09925 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
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