Nickel Alloy Nimonic 90
UNS N07090 · EN 2.4632, NiCr20Co18Ti
Nimonic 90 is a precipitation-hardenable Ni-Cr-Co alloy (UNS N07090, 2.4632, NiCr20Co18Ti) strengthened by Ti/Al gamma-prime and supplied as bar, forgings, sheet, wire and fasteners.
Reference datasheet — Nimonic 90 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the STA condition
Nimonic 90 tempers and conditions
Nimonic 90 is supplied in 5 conditions, soft to hard. STA is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Softened / annealed | Most ductile condition; choose for deep drawing, bending or spinning of sheet before ageing. | 360 | 850 | 50 | 10 HRC | 1.4 % IACS |
Solution annealed | Supply condition for parts that will be machined or formed before final ageing. | 400 | 880 | 45 | 200 HB | — |
STADefault Solution treated and aged | Standard service condition for turbine blades, discs, rings and bolts requiring full γ′ strength to ~900 °C. | 810 | 1,240 | 27 | 35 HRC | — |
Cold drawn | Cold-drawn stock for close-tolerance small bar and wire that will be aged after fabrication. | 850 | 1,100 | 18 | 34 HRC | 1.5 % IACS |
Hard drawn spring wire | For high-temperature springs and fasteners where maximum room-temperature strength and relaxation resistance are needed. | 1,200 | 1,450 | 8 | 44 HRC | 1.5 % IACS |
What is Nimonic 90?
Nimonic 90 is a precipitation-hardenable Ni-Cr-Co alloy (UNS N07090, 2.4632, NiCr20Co18Ti) strengthened by Ti/Al gamma-prime and supplied as bar, forgings, sheet, wire and fasteners. In the solution-treated and aged condition it gives 810 MPa yield, 1240 MPa tensile, 27% elongation and 330 HB (35 HRC), holding strength and creep resistance to about 920 °C. Machinability (14), weldability (25) and formability (20) ratings are all low, so forming and welding are done in the softened or solution-treated condition and the part is re-aged afterwards. Nimonic 80A is the cobalt-free alternative at lower strength. Nimonic 90 has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,310°C (2,390 °F). Nimonic 90 has a yield strength of 810 MPa (117 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 84% of nickel alloy grades. Elongation at break is 27% and the elastic modulus is 213 GPa (30.9 Msi).
What is Nimonic 90 used for?
- turbine blades
- turbine discs
- exhaust valves
- high-temperature springs and fasteners
Advantages
- High strength — 810 MPa (117 ksi), better than 84% of nickel alloy grades
Limitations
- High embodied carbon — 16 kg CO₂/kg, worse than 93% of nickel alloy grades
- Difficult to weld — 25/100, worse than 82% of nickel alloy grades
- Limited formability — 20/100, worse than 75% of nickel alloy grades
Nimonic 90 properties
Typical room-temperature values for Nimonic 90-STA; bars are the position among nickel alloy grades.
Physical3
Nimonic 90 has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,310°C (2,390 °F).
Mechanical16
Nimonic 90 has a yield strength of 810 MPa (117 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 84% of nickel alloy grades. Elongation at break is 27% and the elastic modulus is 213 GPa (30.9 Msi).
Thermal5
Nimonic 90 is rated for continuous service to 920°C (1,688 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), better than 57% of nickel alloy grades. Thermal expansion is 12.7 µm/m·K (7.06 µin/in·°F).
Electrical3
Nimonic 90 conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 71% of nickel alloy grades.
Sustainability4
Producing a kilogram of Nimonic 90 takes about 240 MJ of energy and emits 16 kg of CO₂ — more than 96% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability8
Nimonic 90's machinability is not recommended (14/100, worse than 81% of nickel alloy grades); weldability poor (25/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Nimonic 90 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Nimonic 90
Is Nimonic 90 easy to machine?
Machine preferably in the solution-treated condition with rigid setups, positive-rake carbide or ceramic tooling, low speeds (15–25 m/min carbide), heavy constant feed and flood coolant to avoid work hardening and glazing.
Can Nimonic 90 be welded?
GTAW/EB weld in the solution-treated state using matching or Ni-Cr filler, then re-solution and age; welding aged material risks γ′ strain-age cracking in the HAZ.
Can Nimonic 90 be formed, bent or molded?
Hot work at 1050–1180 °C with frequent reheats; cold forming only from the softened condition with high forces and interstage anneals.
Nimonic 90 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 18 – 21 | 19.5 |
| Co | 15 – 21 | 18 |
| Tiγ′ former | 1.8 – 3 | 2.4 |
| Alγ′ former | 1 – 2 | 1.4 |
| Fe | ≤ 1.5 | 0.5 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 1 | 0.3 |
| C | ≤ 0.13 | 0.07 |
| Cu | ≤ 0.2 | 0.05 |
| Zr | ≤ 0.15 | 0.06 |
| B | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0 |
| Nibalance, plus Co | balance |
What surface finishes work on Nimonic 90?
Descale by grit blasting plus HF-HNO₃ pickling; can be electropolished or fine ground, and aluminide/MCrAlY or thermal-barrier coatings are used for hot-gas-path parts (no anodizing).
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Nimonic 90 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N07090
- EN / DIN / Werkstoff-Nr.
- 2.4632NiCr20Co18Ti
How much does Nimonic 90 cost?
Nimonic 90 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Nimonic 90 — frequently asked
What is Nimonic 90 used for?
Nimonic 90 is typically used for turbine blades, turbine discs, exhaust valves and high-temperature springs and fasteners. In short: classic gas-turbine Nimonic; 920 °C creep strength; gamma-prime hardened Ni-Cr-Co.
What is the yield strength of Nimonic 90?
Nimonic 90 has a typical yield strength of 810 MPa (117 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 84% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Nimonic 90 easy to machine?
Not especially — machinability is rated not recommended (14/100, worse than 81% of nickel alloy grades). Machine preferably in the solution-treated condition with rigid setups, positive-rake carbide or ceramic tooling, low speeds (15–25 m/min carbide), heavy constant feed and flood coolant to avoid work hardening and glazing.
Can Nimonic 90 be welded?
Not readily — weldability is rated poor (25/100). GTAW/EB weld in the solution-treated state using matching or Ni-Cr filler, then re-solution and age; welding aged material risks γ′ strain-age cracking in the HAZ.
What surface finishes work on Nimonic 90?
Descale by grit blasting plus HF-HNO₃ pickling; can be electropolished or fine ground, and aluminide/MCrAlY or thermal-barrier coatings are used for hot-gas-path parts (no anodizing).
Can Nimonic 90 be formed, bent or molded?
Hot work at 1050–1180 °C with frequent reheats; cold forming only from the softened condition with high forces and interstage anneals.
What is the maximum service temperature of Nimonic 90?
Nimonic 90 is rated for continuous use to about 920°C (1,688 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Nimonic 90-STA and Nimonic 90 SOFT?
STA is the default condition — standard service condition for turbine blades, discs, rings and bolts requiring full γ′ strength to ~900 °C. SOFT: most ductile condition; choose for deep drawing, bending or spinning of sheet before ageing. Yield strength is 810 MPa in STA versus 360 MPa in SOFT.
How much does Nimonic 90 cost?
Nimonic 90 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- NIMONIC alloy 90 technical datasheet — Special Metals Corporation (2007)
- AMS 5829 — Nickel Alloy Bars, Forgings and Rings, 57Ni-19.5Cr-18Co-2.4Ti-1.4Al — SAE International (2018)
- BS HR 501/HR 601 (Nimonic 90 bar and sheet) — BSI (1991)
- ASM Specialty Handbook: Heat-Resistant Materials / ASM Handbook Vol.1 — ASM International (1997)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.