Nimonic 80A / Nimonic 90 Round Bars
Nimonic 80A is a wrought, age-hardenable nickel-chromium alloy strengthened by titanium and aluminium additions, giving high creep-rupture strength and oxidation resistance up to about 815 °C. Nimonic 90 adds cobalt to the same base for higher strength and creep resistance at temperatures up to 920 °C, and is one of the classic materials for gas turbine blades, discs and hot section fasteners.
Nexforge Alloys supplies Nimonic 80A and Nimonic 90 round bars in the solution treated and precipitation hardened condition, or solution treated only for customers who carry out their own final ageing. Bars are supported by chemical, tensile and hardness certification, with stress rupture testing available on request.
Nimonic 80A (UNS N07080, W.Nr. 2.4952) and Nimonic 90 (UNS N07090, W.Nr. 2.4632) round bars from 8 mm to 200 mm diameter, as per BS HR1 / HR2 and DIN 17742.
Nimonic 80A / 90 Round Bar Specification
| Parameter | Details |
|---|---|
| Grades | Nimonic 80A (UNS N07080, W.Nr. 2.4952, BS HR1), Nimonic 90 (UNS N07090, W.Nr. 2.4632, BS HR2) |
| Standards | BS HR1, BS HR2, DIN 17742, DIN 17754, W.Nr. 2.4952 / 2.4632, ISO 9723 / 9724 |
| Size Range | 8 mm to 200 mm diameter |
| Length | Random 2 to 4 metres, or cut to length |
| Condition | Solution treated and precipitation hardened (or solution treated only) |
| Surface Finish | Peeled, centreless ground, rough turned |
| Tolerance | h9 / h10 or as per drawing |
| Testing | Chemical, tensile, hardness, stress rupture, UT on request |
| Certification | EN 10204 3.1 mill test certificate; 3.2 on request |
Chemical Composition (% by weight)
| Grade (UNS) | Ni | Cr | Co | Ti | Al | Fe | C | Mn | Si | Cu | B | Zr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nimonic 80A (N07080) | Balance | 18.0 - 21.0 | 2.0 max | 1.80 - 2.70 | 1.00 - 1.80 | 3.0 max | 0.10 max | 1.0 max | 1.0 max | 0.2 max | 0.008 max | 0.15 max |
| Nimonic 90 (N07090) | Balance | 18.0 - 21.0 | 15.0 - 21.0 | 2.00 - 3.00 | 1.00 - 2.00 | 1.5 max | 0.13 max | 1.0 max | 1.0 max | 0.2 max | 0.020 max | 0.15 max |
Mechanical Properties
| Grade | Condition | Tensile Strength (typ.) | 0.2% Yield Strength (typ.) | Elongation (typ.) | Hardness (typ.) | Density |
|---|---|---|---|---|---|---|
| Nimonic 80A | Solution treated + aged | 1000 - 1250 MPa | 620 - 780 MPa | 20 - 30 % | 30 - 36 HRC | 8.19 g/cm³ |
| Nimonic 90 | Solution treated + aged | 1100 - 1250 MPa | 700 - 810 MPa | 20 - 25 % | 32 - 38 HRC | 8.18 g/cm³ |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- High creep-rupture strength and thermal fatigue resistance up to 815 °C (80A) and 920 °C (90)
- Excellent resistance to oxidation and hot corrosion in combustion gases
- Retains strength and hardness after prolonged high temperature exposure
- Suitable for hot forging of exhaust valves, blades and fasteners
Applications
- Gas turbine blades, discs, rings and hot section fasteners
- Automotive and marine diesel engine exhaust valves
- High temperature bolts, studs and nuts for turbines and boilers
- Nuclear boiler tube supports and springs
- Hot working tools, die casting inserts and furnace components