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 | |||
| Ni | Nickel | 35 – 39% | |
| Fe | Iron | Bal. | |
| Cr | Chromium | 23 – 27% | |
| Nb | Niobium | 0.4 – 0.9% | |
| N | Nitrogen | 0.15 – 0.3% | |
| C | Carbon | 0.02 – 0.1% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual6 elements | |||
| Mo | Molybdenum | ≤ 2.5% | |
| W | Tungsten | ≤ 2.5% | |
| Co | Cobalt | ≤ 3% | |
| Mn | Manganese | ≤ 1.5% | |
| Al | Aluminium | ≤ 0.4% | |
| B | Boron | ≤ 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 | |||||
| Cold- or hot-worked bar and rod | Annealed, final heat-treatment temperature not below 1177 °C, mean grain size ASTM No. 5 or coarser | ≥ 621 (90 ksi) | ≥ 276 (40 ksi) | ≥ 30 | |
| Plate, sheet and strip | |||||
| Hot-rolled plate and sheet, cold-rolled sheet and strip | Annealed, final heat-treatment temperature not below 1177 °C, mean grain size ASTM No. 5 or coarser | ≥ 621 (90 ksi) | ≥ 276 (40 ksi) | ≥ 30 | |
| Tube and pipe | |||||
| Seamless pipe and tube | Hot-finished annealed or cold-worked annealed, final heat-treatment temperature not below 1177 °C, mean grain size ASTM No. 5 or coarser | ≥ 621 (90 ksi) | ≥ 276 (40 ksi) | ≥ 30 | |
| Automatic-welded pipe | Cold worked after welding and finally annealed; annealing temperature not less than 1177 °C, mean grain size ASTM No. 5 or coarser | ≥ 621 (90 ksi) | ≥ 276 (40 ksi) | ≥ 30 | |
| Fittings and flanges | |||||
| Formed fittings | Final heat-treated condition; recommended set temperature 1189–1220 °C, then rapidly air or water cooled | — | — | — | |
| Fittings (factory-made wrought butt-weld / socket) | 2175-2225 °F [1189-1220 °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 — ASTM No. 5 or coarser
Mean grain diameter approx. ≥ 63.5 μm
Mandatory acceptance requirement in the annealed condition; heat-exchanger tube is sampled transversely through the full wall.
Where this grade is recommended
Matched in 4 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Quench & carburising fixtures | Furnaces & Vacuum | 950 – 1050 °C | 2 / 8 | 89 |
| Furnace internals & fixtures | Furnaces & Vacuum | 900 – 1150 °C | 4 / 12 | 88 |
| Muffles & radiant tubes | Furnaces & Vacuum | 1000 – 1150 °C | 4 / 9 | 87 |
| Waste-to-energy boilers | Environmental & FGD | 450 – 700 °C | 5 / 8 | 85 |
Designations & equivalents
| EN designation | Fe-Ni-Cr |
| Trade name(s) | Haynes HR-120 / HR-120 / HR120 |
| ASTM / AISI | B366 / B409 |
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
8 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 HR-120?
HR-120 — Fe-Ni superalloys. Solid-solution Fe-Ni-Cr — oxidation- and carburisation-resistant to 1150 °C for heat-treat fixtures, kiln furniture and turbine hot sections
What is the maximum service temperature of N08120?
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 N08120?
The specified minimum tensile strength is 621 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 N08120?
ASTM B409, ASTM B408, ASTM B407, ASTM B514, ASTM B515, ASTM B163, ASTM B564 (forgings), ASTM B366/B366M
Where is N08120 typically used?
Quench & carburising fixtures (Furnaces & Vacuum); Furnace internals & fixtures (Furnaces & Vacuum); Muffles & radiant tubes (Furnaces & Vacuum); Waste-to-energy boilers (Environmental & FGD)
In which forms is N08120 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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