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UNS N07090 Nimonic Alloy High Strength W. Nr. 2.4632 Precipitation Hardenable
Introduction
UNS N07090 is a precipitation-hardenable nickel-chromium-cobalt alloy having high stress-rupture strength and creep resistance at temperatures to about 1700°F (920°C). UNS N07090 also has good resistance to high-temperature corrosion and oxidation. Nimonic 90 is used for blades and discs in gas turbines, hot-working tools, and springs.
Characters
High stress rupture strength and high creep resistance at high temperatures
Good resistance to high-temperature corrosion and oxidation
Age-hardenable
High temperature dynamic applications
Application
The alloy is used for turbine blades, discs, forgings, ring sections and hot-working tools. Also used to make Aerospace fasteners.
Chemical composition
| Element | C | Cr | Co | Al | Ti | Fe | Zr |
| Weight(%) | ≤0.13 | 18.00~21.00 | 15.00~21.00 | 1.00~2.00 | 2.00~3.00 | ≤1.50 | ≤0.0150 |
| Element | B | Si | Mn | S | P | Cu | Ni |
| Weight(%) | ≤0.020 | ≤0.80 | ≤0.40 | ≤0.015 | ≤0.020 | ≤0.200 | Rem |
Typical Mechanical Properties – Spring Applications
Solution Treated
Heat Treatment: 1922 - 2012°F (1050 - 1100°C) + WQ
Tensile Strength: 157 ksi max; (1080 MPa) max
Spring Temper
Heat Treatment: As supplied condition.
Tensile Strength: 189 - 223 ksi; (1300-1540 MPa)
Spring Temper + Aged
Heat Treatment: After spring coiling. Age: 1202°F (650°C) for 4 hours. Alternatively, Age at 1112°F(600°C) for 16 hours and air cool.
Tensile Strength: 189 – 260 ksi; (1300 – 1800 MPa)
Suggested Operating Conditions: Optimum stress and low relaxation at temperatures up to 700°F (371°C)
Solution Treated + Aged
Heat Treatment: After spring coiling: Solution Heat Treat: 1976°F (1080°C) followed by rapid cooling + Age at 1382°F (750°C) for 4 hours and air cool. Alternatively, Age at 1292°F (700°C) for 16 hours and air cool
Tensile Strength: 145 - 203 ksi; (1080 - 1400 MPa)
Suggested Operating Conditions: Optimum resistance to relaxation at temperatures up to 1112°F (600°C)
