Technical Data Sheet
Nimonic alloy 90 is a precipitation hardenable nickel-chromium-cobalt alloy strengthened by the addition of Titanium and Aluminum. Alloy 90 has a high stress rupture strength and creep-resistant at temperatures to 920°C. Nimonic Alloy 90 is typically used in extreme stress applications such as turbine blades, hot working tools, exhaust reheaters, disc and high-temperature springs.
The recommended heat treatments for Nimonic 90 are as follows:
Nimonic 90 Bar
Solution Treatment – 1080 °C (1975 °F) for 8 hours + air cool or oil/ water quench
Precipitation Heat Treatment (As per BS HR2) – 700 °C (1290 °F) for 16 hours + air cool
Nimonic 90 Sheet
Solution Treatment – 1100-1150 °C for 1-10 minutes + air cool or oil /water quench
Stabilization Heat Treatment – 925 °C for 1 hour + air cool
Precipitation Heat Treatment – 750 °C for 4 hours and air cool
(BS HR202/ MSRR 7016 / Siemens TLV 85252100 do not require the Stabilization Treatment stage)
| Chemical Composition Limits | ||||||||||||||
| Weight % | Ni | Cr | Co | Ti | Al | C | Si | Cu | Fe | Mn | B | S | Zr | Pb |
| Alloy 90 | Bal | 18-21 | 15-21 | 2-3 | 1-2 | 0.2 max | 1.0 max | 0.2 max | 1.5 max | 1.0 max | 0.02 max | 0.015 max | 0.15 max | 0.0020 max |
Typical Mechanical Properties
| Material Extruded Bar |
Temperature °C | Yield Strength 0.2% (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness HV |
| Nimonic 90 bar Solution Treated (BS HR2) |
RT | – | – | – | 295 max |
| Nimonic 90 bar Precipition Treated (BS HR2) |
RT | 695 min | 1080 min | 20 min | 310 min |
| Nimonic 90 Bar Precipitation Treated (BS HR2) |
500 | 672 (typical) | 1038 (typical) | 31 | – |
| Material Sheet |
Temperature °C | Yield Strength 0.2% (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness HV |
| Nimonic 90 sheet solution treated (BS HR202) |
RT | – | – | – | 250 max |
| Nimonic 90 sheet Precipitation Treated (BS HR202) |
RT | 695 min | 1080 min | 25 min (0.45mm-3.0mm) |
280 min |
| Nimonic 90 sheet Precipitation Treated (BS HR 202) |
500 | 740 (typical) | 995 (typical) | 30 | – |
| Alloy 90 Cold Rolled Sheet (Heat Treated) |
