Nickel Alloy Nimonic 80A
UNS N07080 · EN 2.4631, 2.4952 · GB GH4080A
Nimonic 80A is a precipitation-hardened Ni-Cr superalloy (UNS N07080, 2.4631, NiCr20TiAl, GH4080A) strengthened by γ′ formed from titanium and aluminium additions, and one of the earliest gas-turbine alloys.
Reference datasheet — Nimonic 80A 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 80A tempers and conditions
Nimonic 80A 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 |
|---|---|---|---|---|---|---|
Solution annealed | Softest supply condition — pick it for machining, deep forming or bending before the customer performs the ageing treatment. | 320 | 800 | 45 | 185 HB | — |
1080 °C/8 h AC + 850 °C/24 h AC stabilise + 700 °C/16 h AC | Triple heat treatment for turbine blades/rings that see prolonged 750–850 °C service — trades a little room-temperature strength for microstructural stability and creep life. | 640 | 1,010 | 30 | 30 HRC | 1.4 % IACS |
STADefault Solution treated and aged | Standard commercial bar/forging condition — the best all-round strength/ductility balance for fasteners, valves and hot tooling to ~815 °C. | 700 | 1,100 | 27 | 33 HRC | — |
Hot forged / hot rolled and precipitation hardened | Valve-head and hot-forged part condition specified by hardness — used for exhaust valves and hot-work punches where a 300–380 HB forged body is required. | 730 | 1,120 | 22 | 36 HRC | 1.4 % IACS |
Cold drawn bar/wire, then aged 700 °C/16 h | Highest-strength small-section product (bolts, springs, wire) — cold work plus ageing raises strength but ductility and weldability drop sharply. | 900 | 1,230 | 15 | 38 HRC | — |
Supply forms, finishes and certifications
Ways Nimonic 80A is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
BA | Bright/solution annealed sheet, strip and wire | Surface finish |
What is Nimonic 80A?
Nimonic 80A is a precipitation-hardened Ni-Cr superalloy (UNS N07080, 2.4631, NiCr20TiAl, GH4080A) strengthened by γ′ formed from titanium and aluminium additions, and one of the earliest gas-turbine alloys. Solution-treated and aged material holds about 700 MPa yield, 1100 MPa tensile and 27 % elongation at 310 HB (33 HRC) with service to 815 °C, and is supplied as bar, forgings, valve blanks and spring wire. Machinability (15) and formability (30) are low, and welding (30) carries strain-age cracking risk, so parts are machined and welded before ageing. Alloy 718 is the usual alternative when better weldability is required. Nimonic 80A has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,360°C (2,480 °F). Nimonic 80A has a yield strength of 700 MPa (102 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 27% and the elastic modulus is 222 GPa (32.2 Msi).
What is Nimonic 80A used for?
- turbine blades (early designs)
- exhaust valves
- high-temperature springs and fasteners
Advantages
- High strength — 700 MPa (102 ksi), better than 81% of nickel alloy grades
Limitations
- Difficult to weld — 30/100, worse than 78% of nickel alloy grades
Nimonic 80A properties
Typical room-temperature values for Nimonic 80A-STA; bars are the position among nickel alloy grades.
Physical3
Nimonic 80A has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,360°C (2,480 °F).
Mechanical15
Nimonic 80A has a yield strength of 700 MPa (102 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 27% and the elastic modulus is 222 GPa (32.2 Msi).
Thermal6
Nimonic 80A is rated for continuous service to 815°C (1,499 °F). It conducts heat at 11.2 W/m·K (6.47 BTU/hr·ft·°F), worse than 52% of nickel alloy grades. Thermal expansion is 12.7 µm/m·K (7.06 µin/in·°F).
Electrical3
Nimonic 80A conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (75/100), worse than 63% of nickel alloy grades.
Sustainability4
Producing a kilogram of Nimonic 80A takes about 200 MJ of energy and emits 13.5 kg of CO₂ — more than 78% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability6
Nimonic 80A's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability poor (30/100); formability poor (30/100).
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 80A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Nimonic 80A
Is Nimonic 80A easy to machine?
Machine preferably in the solution-treated state with rigid setups, positive-rake carbide or ceramic tooling, low speed/heavy feed and flood coolant; never dwell — the alloy work-hardens instantly and glazes the cut.
Can Nimonic 80A be welded?
GTAW/EB weld in the solution-treated condition using matching or Ni-Cr-Ti filler, low heat input and no interpass overheating, then re-solution and age; direct welding of aged material risks strain-age (γ′ reheat) cracking.
Can Nimonic 80A be formed, bent or molded?
Hot work at 1050–1150 °C with frequent reheats; cold forming only from the annealed condition with heavy tooling and interstage anneals at 1080 °C due to the very high work-hardening rate.
Nimonic 80A 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 |
| Tiγ′ former | 1.8 – 2.7 | 2.4 |
| Alγ′ former | 1 – 1.8 | 1.4 |
| Fe | ≤ 3 | 1 |
| Co | ≤ 2 | 0.5 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 1 | 0.3 |
| C | ≤ 0.1 | 0.06 |
| Cu | ≤ 0.2 | 0.05 |
| Zr | ≤ 0.15 | 0.05 |
| B | ≤ 0.01 | 0 |
| S | ≤ 0.02 | 0.01 |
| Nibalance, plus Co counted with Ni in some specs | ≥ 65 (balance) |
What surface finishes work on Nimonic 80A?
Grit-blast or pickle in HNO₃-HF to remove the tenacious Cr/Ti/Al oxide before brazing, plating or NDT; it takes a good mechanical polish, and no anodizing applies (n/a for Ni alloys).
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 80A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N07080
- EN / DIN / Werkstoff-Nr.
- 2.46312.4952NiCr20TiAl
- GB (China)
- GH4080A
- Also called
- NA20
How much does Nimonic 80A cost?
Nimonic 80A 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 80A — frequently asked
What is Nimonic 80A used for?
Nimonic 80A is typically used for turbine blades (early designs), exhaust valves and high-temperature springs and fasteners. In short: classic γ′-hardened Ni-Cr alloy; 815 °C service capability; very low machinability rating.
What is the yield strength of Nimonic 80A?
Nimonic 80A has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 81% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Nimonic 80A easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machine preferably in the solution-treated state with rigid setups, positive-rake carbide or ceramic tooling, low speed/heavy feed and flood coolant; never dwell — the alloy work-hardens instantly and glazes the cut.
Can Nimonic 80A be welded?
Not readily — weldability is rated poor (30/100). GTAW/EB weld in the solution-treated condition using matching or Ni-Cr-Ti filler, low heat input and no interpass overheating, then re-solution and age; direct welding of aged material risks strain-age (γ′ reheat) cracking.
What surface finishes work on Nimonic 80A?
Grit-blast or pickle in HNO₃-HF to remove the tenacious Cr/Ti/Al oxide before brazing, plating or NDT; it takes a good mechanical polish, and no anodizing applies (n/a for Ni alloys).
Can Nimonic 80A be formed, bent or molded?
Hot work at 1050–1150 °C with frequent reheats; cold forming only from the annealed condition with heavy tooling and interstage anneals at 1080 °C due to the very high work-hardening rate.
What is the maximum service temperature of Nimonic 80A?
Nimonic 80A is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Nimonic 80A-STA and Nimonic 80A-ST?
STA is the default condition — standard commercial bar/forging condition — the best all-round strength/ductility balance for fasteners, valves and hot tooling to ~815 °C. ST: softest supply condition — pick it for machining, deep forming or bending before the customer performs the ageing treatment. Yield strength is 700 MPa in STA versus 320 MPa in ST.
How much does Nimonic 80A cost?
Nimonic 80A 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 80A technical bulletin — Special Metals Corporation (2004)
- BS 3076 / HR 1 – Nickel and nickel alloy bar (NA20) — BSI (1989)
- EN 10090 Valve steels and alloys for internal combustion engines (NiCr20TiAl, 2.4952) — CEN (1998)
- GB/T 14992 / GH4080A high-temperature alloy designations — SAC (2005)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Superalloys: A Technical Guide, 2nd ed. — ASM International (2002)
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.