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 elements5 elements | |||
| Ni | Nickel | Bal. | |
| Mo | Molybdenum | 15 – 18% | |
| Cr | Chromium | 6 – 8% | |
| Fe | Iron | ≤ 5% | |
| C | Carbon | 0.04 – 0.08% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual10 elements | |||
| Co | Cobalt | ≤ 0.2% | |
| Cu | Copper | ≤ 0.35% | |
| B | Boron | ≤ 0.01% | |
| Al+Ti | Aluminium + titanium | ≤ 0.5% | |
| W | Tungsten | ≤ 0.5% | |
| V | Vanadium | ≤ 0.5% | |
| S | Sulphur | ≤ 0.02% | |
| Mn | Manganese | ≤ 1% | |
| Si | Silicon | ≤ 1% | |
| P | Phosphorus | ≤ 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 | Hot- or cold-finished, annealed | ≥ 690 (100 ksi) | ≥ 280 (41 ksi) | ≥ 35 | |
| Plate, sheet and strip | |||||
| Plate, sheet and strip | Hot or cold rolled, annealed and descaled; descaling not required where bright annealed | ≥ 690 (100 ksi) | ≥ 280 (41 ksi) | ≥ 40 | |
| Fittings and flanges | |||||
| Formed fittings | Final heat-treated condition; set temperature not less than 1177 °C, then rapidly air or water cooled | — | — | — | |
| Fittings (factory-made wrought butt-weld / socket) | 2150 °F [1177 °C] minimum, rapid air or water quench | — | — | — | Tensile properties follow the starting material. No tension test on the finished fitting unless agreed. Minimum temperature. |
Where this grade is recommended
Matched in 2 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Molten salt systems | Power & Nuclear | 290 – 565 °C | 1 / 4 | 96 |
| CSP & molten-salt receivers | Hydrogen & New Energy | 300 – 565 °C | 1 / 4 | 92 |
Designations & equivalents
| Trade name(s) | Hastelloy N |
| ASTM / AISI | B366 / B434 / B573 |
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
4 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 N · UNS N10003?
Alloy N · UNS N10003 — Ni superalloys. Molten-salt reactor grade — fluoride salt environments
What is the maximum service temperature of N10003?
Typically about 700 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N10003?
The specified minimum tensile strength is 690 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 N10003?
ASTM B434, ASTM B573, ASTM B366/B366M, AWS A5.14/A5.14M
Where is N10003 typically used?
Molten salt systems (Power & Nuclear); CSP & molten-salt receivers (Hydrogen & New Energy)
In which forms is N10003 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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