Physical properties
| Density | 8.1 | g/cm³ |
| Modulus E | 195 / 190 / 182 / 174 / 166 / 158 | GPa @ 20 / 100 / 200 / 300 / 400 / 500 °C |
| Thermal conductivity | 12 | W/(m·K) @ 20 °C |
| Thermal expansion | 15.8 / 16.1 / 16.5 / 16.9 / 17.3 | 10⁻⁶/K, mean 20-100 / 20-200 / 20-300 / 20-400 / 20-500 °C |
| Specific heat | 450 | J/(kg·K) @ 20 °C |
| Resistivity | 1.00 | Ω·mm²/m @ 20 °C |
Informative values: they vary with composition, condition and test method. Use the governing standard or measured mill data for pressure and heat-transfer calculations.
Values are taken from EN 1.4529 (the same alloy) and are informative.
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 elements6 elements | |||
| Fe | Iron | Bal. | |
| Ni | Nickel | 24 – 26% | |
| Cr | Chromium | 19 – 21% | |
| Mo | Molybdenum | 6 – 7% | |
| Cu | Copper | 0.5 – 1.5% | |
| N | Nitrogen | 0.15 – 0.25% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual5 elements | |||
| C | Carbon | ≤ 0.02% | |
| Mn | Manganese | ≤ 2% | |
| Si | Silicon | ≤ 0.5% | |
| P | Phosphorus | ≤ 0.03% | |
| S | Sulphur | ≤ 0.01% | |
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 |
|---|---|---|---|---|---|
| Bar and forgings | |||||
| Pressure-retaining forgings (1.4529, reference section ≤160 mm) | +AT: solution treated at 1020–1100 °C, water cooled | 650 – 850 | ≥ 300 | ≥ 40 | |
| Bars and shapes (boiler and pressure-vessel use) | Annealed | ≥ 650 (94 ksi) | ≥ 295 (43 ksi) | ≥ 35 | Also specified: Hardness ≤ 256 HBW Hardness ≤256 HBW. |
| Bars (EN 10088-3, ≤160 mm) | +AT (solution annealed) | 650 – 850 | ≥ 300 | ≥ 40 | Also specified: Hardness ≤ 250 HBW Rp1.0 ≥ 340 MPa; KV ≥ 100 J longitudinal; 160–250 mm: transverse A ≥ 35 %, KV ≥ 60 J. |
| Plate, sheet and strip | |||||
| Plate, sheet and strip | Solution annealed | ≥ 650 (94 ksi) | ≥ 295 (43 ksi) | ≥ 35 | |
| Cold-rolled strip (EN 10088-2, ≤8 mm) | +AT (solution annealed) | 650 – 850 | ≥ 300 | ≥ 35 | Rp1.0 ≥ 340 MPa. |
| Hot-rolled plate (EN 10088-2, ≤75 mm) | +AT (solution annealed) | 650 – 850 | ≥ 300 | ≥ 40 | Rp1.0 ≥ 340 MPa; hot-rolled strip (≤13.5 mm): A ≥ 35 %. KV ≥ 100/60 J (long./transv., over 10 mm). |
| Tube and pipe | |||||
| Welded pipe and tube | Solution annealed | ≥ 650 (94 ksi) | ≥ 295 (43 ksi) | ≥ 35 | |
| Large-diameter welded pipe (commonly NPS 8 and above) | Class 1–6; recommended minimum 1099 °C, then water quenched or otherwise rapidly cooled | ≥ 650 (94 ksi) | ≥ 295 (43 ksi) | ≥ 35 | |
| Seamless pipe and tube | Check the specification and edition named on the order | — | — | — | |
| Seamless pressure tubes (EN 10216-5, wall ≤60 mm) | +AT (solution annealed) | 600 – 800 | ≥ 270 | ≥ 35 | Rp1.0 ≥ 310 MPa; transverse A ≥ 30 %; KV ≥ 100/60 J (long./transv.). |
| Welded pressure tubes (EN 10217-7, wall ≤60 mm) | +AT (solution annealed) | 600 – 800 | ≥ 300 | ≥ 40 | Rp1.0 ≥ 340 MPa; transverse A ≥ 40 %; KV ≥ 120/90 J (long./transv.). |
| Fittings and flanges | |||||
| Factory-made fittings | Solution treated at not less than 1177 °C, rapidly cooled in water or otherwise | ≥ 650 (94 ksi) | ≥ 295 (43 ksi) | ≥ 28 | |
| Fittings (factory-made wrought butt-weld / socket) | 2150 °F [1177 °C], rapid air or water quench | — | — | — | Recommended temperature; tolerance ±15 °C (±25 °F). Tensile properties follow the starting material. No tension test on the finished fitting unless agreed. |
| Fittings (wrought austenitic stainless, butt-weld / socket) | Solution annealed 2150 °F [1177 °C], water quenched or otherwise rapidly cooled | ≥ 650 (94 ksi) | ≥ 295 (43 ksi) | ≥ 28 | Elongation: ≥28% longitudinal, ≥20% transverse. A single temperature is a minimum. All fittings are supplied heat-treated. |
| Several forms | |||||
| Bar and wire | Solution treated; recommended 1080–1180 °C, then water quenched or rapidly air cooled | ≥ 650 (94 ksi) | ≥ 295 (43 ksi) | ≥ 35 | |
Where this grade is recommended
Matched in 22 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Desalination & RO | Marine & Offshore | ≤ 45 °C | 4 / 12 | 90 |
| Urea & ammonia synthesis | Chemical Processing | 180 – 200 °C | 1 / 5 | 88 |
| Sludge treatment & drying | Environmental & FGD | ≤ 120 °C | 1 / 5 | 88 |
| Water & gas injection | Oil & Gas | ≤ 60 °C | 3 / 8 | 88 |
| Flue-gas desulphurisation | Environmental & FGD | ≤ 80 °C | 6 / 11 | 88 |
| Geothermal & brine | Hydrogen & New Energy | 80 – 200 °C | 3 / 5 | 87 |
| Brine evaporation (MVR) | Environmental & FGD | ≤ 100 °C | 4 / 6 | 87 |
| Evaporators & tube bundles | Chemical Processing | ≤ 80 °C | 5 / 8 | 87 |
| High-velocity seawater | Marine & Offshore | ≤ 40 °C | 6 / 9 | 87 |
| CIP / SIP systems | Pharma & Fine Chemicals | 134 – 200 °C | 1 / 4 | 86 |
| Separators & heat-exchanger internals | Oil & Gas | ≤ 120 °C | 4 / 10 | 86 |
| Ballast & tank systems | Marine & Offshore | 40 – 60 °C | 4 / 10 | 86 |
Top 12 by score shown; 10 more matched conditions — browse them by industry in the selector. Open the selector →
Designations & equivalents
| W.Nr. (Germany) | 1.4529 |
| EN designation | X1NiCrMoCuN25-20-7 |
| Trade name(s) | Incoloy 926 / Cronifer 1925 hMo / 25-6Mo |
| ASTM / AISI | A182 / A240 / A276 / A403 / A479 / A484 / B366 / B625 / B649 / B673 / B804 |
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
14 specifications. Name the standard and its edition on the order.
The current edition of ASTM B677 no longer covers N08926 — confirm the applicable specification with us when you enquire for seamless tube.
More detail 2
In B804 welded pipe the Class fixes whether the weld is single- or double-sided, whether filler is added in the root pass and whether the weld is radiographed, so state the Class on the order; for severe chloride service prefer Class 1 or 2.
For A403 fittings the G48 Method C pitting test is run only when supplementary requirement S4 is ordered, at a temperature agreed between the parties.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is Alloy 926 (6Mo) · UNS N08926?
Alloy 926 (6Mo) · UNS N08926 — Ni corrosion-resistant. 6Mo super-austenitic — seawater and severe chloride / FGD service
What is the maximum service temperature of N08926?
Typically about 400 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N08926?
The specified minimum tensile strength is 650 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 N08926?
ASTM B625, ASTM B649, ASTM B673, ASTM B674, ASTM B804, ASTM B366/B366M, ASTM A403/A403M, ASTM A240/A240M, ASTM A276/A276M, EN 10222-5 (forgings for pressure purposes), EN 10088-2 (sheet, plate, strip), EN 10088-3 (bar, rod, wire, sections), EN 10216-5 (seamless pressure tubes), EN 10217-7 (welded pressure tubes)
Where is N08926 typically used?
Desalination & RO (Marine & Offshore); Urea & ammonia synthesis (Chemical Processing); Sludge treatment & drying (Environmental & FGD); Water & gas injection (Oil & Gas)
In which forms is N08926 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
Or email us: info@kochlin.com