Physical properties
| Density | 8.97 | 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 elements9 elements | |||
| Ni | Nickel | Bal. | |
| Cr | Chromium | 20 – 24% | |
| W | Tungsten | 13 – 15% | |
| Co | Cobalt | ≤ 5% | |
| Mo | Molybdenum | 1 – 3% | |
| Mn | Manganese | 0.3 – 1% | |
| Si | Silicon | 0.25 – 0.75% | |
| C | Carbon | 0.05 – 0.15% | |
| La | Lanthanum | 0.005 – 0.05% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual3 elements | |||
| Fe | Iron | ≤ 3% | |
| Al | Aluminium | ≤ 0.5% | |
| B | Boron | ≤ 0.015% | |
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 | |||||
| Bar and rod | Solution annealed 1204–1246 °C, water quenched or otherwise rapidly cooled | ≥ 760 (110 ksi) | ≥ 310 (45 ksi) | ≥ 40 | |
| Forgings | Solution annealed and rapidly cooled | ≥ 758 (110 ksi) | ≥ 310 (45 ksi) | ≥ 40 | |
| Bar, forgings and flash-welded rings (aerospace) | Solution treated at 1177–1246 °C for at least 20 min, rapidly cooled | ≥ 758 (110 ksi) | ≥ 310 (45 ksi) | ≥ 35 | |
| Plate, sheet and strip | |||||
| Plate, sheet and strip | Annealed and descaled | ≥ 760 (110 ksi) | ≥ 310 (45 ksi) | ≥ 40 | |
| Plate, sheet and strip (aerospace) | Solution treated at 1177–1246 °C, rapidly cooled | ≥ 793 (115 ksi) | ≥ 345 (50 ksi) | ≥ 40 | |
| Tube and pipe | |||||
| Welded pipe and tube | Solution treated at 1204–1246 °C, rapidly cooled | ≥ 760 (110 ksi) | ≥ 310 (45 ksi) | ≥ 40 | |
| Seamless pipe and tube | Solution annealed and descaled | ≥ 760 (110 ksi) | ≥ 310 (45 ksi) | ≥ 40 | |
| Fittings and flanges | |||||
| Fittings (factory-made wrought butt-weld / socket) | 2150-2250 °F [1177-1232 °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. |
Grain size
Required by the standard, conditionally — t ≤3.175 mm: ASTM micrograin size No. 3.0 or finer (mean grain dia. 0.127 mm); t >3.175 mm: No. 1.5 or finer (0.214 mm)
Applies to annealed sheet and strip only, banded by thickness; it does not apply to bar — for bar, grain size is specified only for N12160, so Haynes 230 bar carries no grain-size acceptance requirement.
More detail 2
The direction is the reverse of 800H/800HT: here the limit is "No. 3.0 or finer", a floor on the fine side (thin sheet needs fine grain to form), whereas N08810 requires "No. 5 or coarser", a ceiling on the fine side (creep needs coarse grain).
Whenever you see "ASTM grain size number N", check first whether it reads "or finer" or "or coarser".
Where this grade is recommended
Matched in 13 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Gas-turbine hot section | Power & Nuclear | 800 – 950 °C | 1 / 10 | 91 |
| Exhaust & afterburner | Aerospace | 700 – 950 °C | 2 / 8 | 91 |
| Furnace internals & fixtures | Furnaces & Vacuum | ≤ 900 °C | 4 / 12 | 90 |
| Muffles & radiant tubes | Furnaces & Vacuum | 850 – 1000 °C | 4 / 9 | 89 |
| CSP & molten-salt receivers | Hydrogen & New Energy | 300 – 565 °C | 2 / 4 | 88 |
| HT boiler & superheater | Power & Nuclear | 450 – 600 °C | 4 / 6 | 88 |
| Engine hot section | Aerospace | 900 – 1100 °C | 4 / 9 | 88 |
| Quench & carburising fixtures | Furnaces & Vacuum | 850 – 950 °C | 6 / 8 | 87 |
| Exhaust systems & converters | Automotive & Racing | 400 – 700 °C | 2 / 5 | 86 |
| SOFC interconnects | Hydrogen & New Energy | 600 – 850 °C | 2 / 4 | 86 |
| Molten salt systems | Power & Nuclear | 290 – 565 °C | 2 / 4 | 85 |
| DeNOx SCR & ducting | Environmental & FGD | 320 – 400 °C | 4 / 5 | 85 |
Top 12 by score shown; 1 more matched conditions — browse them by industry in the selector. Open the selector →
Designations & equivalents
| UNS | N06230 / N06231 (230-W) |
| W.Nr. (Germany) | 2.4733 |
| EN designation | NiCr22W14Mo |
| Trade name(s) | Haynes 230 |
| ASTM / AISI | B366 / B435 / B564 / B572 / B619 / B622 |
| AMS (SAE aerospace) | 5878 / 5891 |
| AWS (welding) | A5.14 ERNiCrWMo-1 |
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
9 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 230 · UNS N06230?
Alloy 230 · UNS N06230 — Ni superalloys. Tungsten-strengthened — 1150 °C-class oxidation resistance for turbines and furnaces
What is the maximum service temperature of N06230?
Typically about 1150 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N06230?
The specified minimum tensile strength is 760 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 N06230?
ASTM B435, ASTM B572, ASTM B564 (forgings), ASTM B619, ASTM B622, ASTM B366, AMS5878, AMS5891, AWS A5.14
Where is N06230 typically used?
Gas-turbine hot section (Power & Nuclear); Exhaust & afterburner (Aerospace); Furnace internals & fixtures (Furnaces & Vacuum); Muffles & radiant tubes (Furnaces & Vacuum)
In which forms is N06230 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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