Physical properties
| Density | 8.2 | g/cm³ |
| Modulus E | 227 | GPa |
| Thermal conductivity | 13 | W/(m·K) |
| Thermal expansion | 12.4 | ×10⁻⁶/K |
| Specific heat | 0.45 | kJ/(kg·K) |
| Resistivity | 1.18 | Ω·mm²/m |
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 elements5 elements | |||
| Ni | Nickel | Bal. | |
| Cr | Chromium | 18 – 21% | |
| Co | Cobalt | 15 – 21% | |
| Ti | Titanium | 2 – 3% | |
| Al | Aluminium | 1 – 2% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual4 elements | |||
| Fe | Iron | ≤ 1.5% | |
| C | Carbon | ≤ 0.13% | |
| B | Boron | ≤ 0.02% | |
| Zr | Zirconium | ≤ 0.15% | |
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 | |||||
| Long products (thickness or dia. ≤160 mm) | P, precipitation hardened | ≥ 1100 | ≥ 700 | ≥ 15 | |
| Plate, sheet and strip | |||||
| Sheet and strip (0.25-0.35 mm) | Supplied soft; service condition after ageing at 750 ± 10 °C for 4 h, air cooled | ≥ 1080 | ≥ 695 | ≥ 15 | Also specified: Hardness ≥ 280 HV |
| Sheet and strip (>0.35-0.45 mm) | Supplied soft; service condition after ageing at 750 ± 10 °C for 4 h, air cooled | ≥ 1080 | ≥ 695 | ≥ 20 | Also specified: Hardness ≥ 280 HV |
| Sheet and strip (>0.45-3.0 mm) | Supplied soft; service condition after ageing at 750 ± 10 °C for 4 h, air cooled | ≥ 1080 | ≥ 695 | ≥ 25 | Also specified: Hardness ≥ 280 HV |
Creep behaviour
Guidance values (MPa) — Mean values of a scatter band. They are neither an acceptance requirement nor a design allowable stress. Figures in parentheses are long-term extrapolations and less reliable than the tested range.
| Temp °C | Creep strength Rp1.0 (1% plastic strain) | Rupture strength Ru | ||
|---|---|---|---|---|
| 10 000 h | 100 000 h | 10 000 h | 100 000 h | |
| 550 | — | — | 730 | 580 |
| 600 | — | — | 580 | 430 |
| 650 | — | — | 420 | 280 |
| 700 | 260 | 130 | 275 | 140 |
| 750 | 150 | 70 | 160 | 80 |
| 800 | 60 | 20 | 85 | 35 |
Thermal expansion and elastic modulus
| Temperature range | Mean coefficient ×10⁻⁶/K |
|---|---|
| 20–200 °C | 12.4 |
| 20–300 °C | 13.1 |
| 20–400 °C | 13.5 |
| 20–600 °C | 14.6 |
| 20–800 °C | 16.5 |
| 20–1000 °C | 19.2 |
Elastic modulus vs temperature
| Temp °C | E GPa |
|---|---|
| 20 | 227 |
| 100 | 221 |
| 200 | 215 |
| 300 | 208 |
| 400 | 201 |
| 500 | 194 |
| 600 | 186 |
| 700 | 178 |
| 800 | 167 |
| 900 | 155 |
| 1000 | 140 |
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 |
|---|---|---|---|---|
| Engine hot section | Aerospace | 900 – 1100 °C | 1 / 9 | 90 |
| Engine & exhaust valves | Automotive & Racing | 500 – 750 °C | 2 / 7 | 90 |
Designations & equivalents
| W.Nr. (Germany) | 2.4632 |
| EN designation | NiCr20Co18Ti |
| Trade name(s) | Nimonic 90 |
| AMS (SAE aerospace) | 5829 |
| BS (UK) | HR 2 / HR 501 / HR 502 / HR 503 (bar/forging) · HR 202 (sheet/plate/strip) · HR 402 (pipe/tube) |
EN 10302 and the BS aerospace standards identify the alloy by designation (NiCr20Co18Ti / 2.4632), not by the trade name Nimonic 90 — order by standard number, not by trade name alone.
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
2 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 90 · UNS N07090?
Alloy 90 · UNS N07090 — Ni superalloys. Uprated 80A — blades and rings, 870 °C class
What is the maximum service temperature of N07090?
Typically about 870 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N07090?
The specified minimum tensile strength is 1100 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 N07090?
EN 10302 (creep-resisting steels, nickel and cobalt alloys), BS 3HR
Where is N07090 typically used?
Engine hot section (Aerospace); Engine & exhaust valves (Automotive & Racing)
In which forms is N07090 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