Nickel Alloy N07773
UNS N07773
N07773 is a precipitation-hardenable nickel-chromium-iron superalloy registered under UNS N07773 for parts needing high strength and creep resistance at elevated temperature.
Reference datasheet — N07773 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
N07773 tempers and conditions
N07773 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 | Pick for forming, machining of complex features or welding before the final ageing cycle. | 450 | 900 | 45 | 200 HB | — |
As-welded deposit | Property level of an unaged joint; re-solution + age is normally required to restore parent strength. | 450 | 850 | 25 | 210 HB | 1.4 % IACS |
Hot worked / as-forged, unaged | Mill condition for forging stock and oversize bar that will be re-heat-treated by the part maker. | 620 | 1,000 | 30 | 25 HRC | 1.4 % IACS |
STADefault Solution treated and aged | Standard supply and service condition: maximum room- and elevated-temperature strength and creep resistance. | 1,030 | 1,275 | 16 | 38 HRC | — |
Cold drawn | For close-tolerance bar, fastener wire and springs where cold work supplements the ageing response. | 1,100 | 1,300 | 12 | 40 HRC | 1.4 % IACS |
What is N07773?
N07773 is a precipitation-hardenable nickel-chromium-iron superalloy registered under UNS N07773 for parts needing high strength and creep resistance at elevated temperature. It is processed as bar, forgings and hot-finished or cold-drawn stock in solution-annealed, STA, hot-finished, cold-drawn and as-welded conditions, with aged values around 1030 MPa yield, 1275 MPa tensile, 16 % elongation and 38 HRC and a maximum service temperature of 650 °C. Machinability 15, formability 20 and weldability 40 mean forming and welding are done annealed with a full re-solution and double age afterwards. Availability is limited compared with Alloy 718, which covers a similar temperature range and is the practical substitute. N07773 has a density of 8.2 g/cm³ (0.296 lb/in³), lighter than 63% of nickel alloy grades. It melts at 1,260°C (2,300 °F). N07773 has a yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,275 MPa (185 ksi) — stronger than 96% of nickel alloy grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi).
What is N07773 used for?
- gas turbine hot-section hardware
- aerospace fasteners
- high-temperature structural components
Advantages
- High strength — 1,030 MPa (149 ksi), better than 96% of nickel alloy grades
Limitations
- Limited ductility — 16%, worse than 79% of nickel alloy grades
- Limited formability — 20/100, worse than 75% of nickel alloy grades
N07773 properties
Typical room-temperature values for N07773-STA; bars are the position among nickel alloy grades.
Physical3
N07773 has a density of 8.2 g/cm³ (0.296 lb/in³), lighter than 63% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical15
N07773 has a yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,275 MPa (185 ksi) — stronger than 96% of nickel alloy grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
N07773 is rated for continuous service to 650°C (1,202 °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 13 µm/m·K (7.22 µin/in·°F).
Electrical3
N07773 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 51% of nickel alloy grades.
Sustainability4
Producing a kilogram of N07773 takes about 150 MJ of energy and emits 12 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
N07773's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability fair (40/100); 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. N07773 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N07773
Is N07773 easy to machine?
Machine in the solution-annealed state where possible; aged material needs rigid setups, positive-rake carbide or ceramic tooling, low surface speed, heavy constant feed and flood coolant to avoid work hardening and notching.
Can N07773 be welded?
GTAW/EBW with matching or Ni-Cr filler on solution-annealed material; keep heat input low and follow with a full re-solution + double age to avoid strain-age cracking and restore joint strength.
Can N07773 be formed, bent or molded?
Cold form only in the annealed condition with high tooling loads and frequent intermediate anneals; hot forge in a narrow window (~1050–1150 °C) with controlled finish temperature to keep grain size.
N07773 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.
| Element | Spec limit (wt %) |
|---|---|
| Crprincipal oxidation/corrosion-resisting addition, class range roughly 14–20 % — verify against the UNS/AMS registration for this grade | — |
| Fesignificant intentional addition (Ni-Cr-Fe family); exact range not confirmed for N07773 | — |
| Tiγ′ former; exact range not confirmed | — |
| Alγ′ former; exact range not confirmed | — |
| Nbpossible γ″/carbide former; presence and range not confirmed | — |
| Mopossible solid-solution strengthener; presence and range not confirmed | — |
| Clow, typically ≤0.10 % in this class | — |
| Sresidual, typically ≤0.015 % | — |
| Presidual, typically ≤0.015 % | — |
| Nimatrix; γ′/γ″ precipitation-hardening Ni-Cr-Fe system | balance |
What surface finishes work on N07773?
Not anodizable — pickle/passivate or electropolish after heat treatment, shot peen for fatigue life, and use aluminide or MCrAlY coatings for long hot-gas exposure.
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
How much does N07773 cost?
N07773 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.
N07773 — frequently asked
What is N07773 used for?
N07773 is typically used for gas turbine hot-section hardware, aerospace fasteners and high-temperature structural components. In short: 718-class aged strength; limited-availability UNS grade; 650 °C creep service.
What is the yield strength of N07773?
N07773 has a typical yield strength of 1,030 MPa (149 ksi) and a tensile strength of 1,275 MPa (185 ksi) — stronger than 96% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is N07773 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machine in the solution-annealed state where possible; aged material needs rigid setups, positive-rake carbide or ceramic tooling, low surface speed, heavy constant feed and flood coolant to avoid work hardening and notching.
Can N07773 be welded?
With care — weldability is rated fair (40/100). GTAW/EBW with matching or Ni-Cr filler on solution-annealed material; keep heat input low and follow with a full re-solution + double age to avoid strain-age cracking and restore joint strength.
What surface finishes work on N07773?
Not anodizable — pickle/passivate or electropolish after heat treatment, shot peen for fatigue life, and use aluminide or MCrAlY coatings for long hot-gas exposure.
Can N07773 be formed, bent or molded?
Cold form only in the annealed condition with high tooling loads and frequent intermediate anneals; hot forge in a narrow window (~1050–1150 °C) with controlled finish temperature to keep grain size.
What is the maximum service temperature of N07773?
N07773 is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N07773-STA and N07773-SA?
STA is the default condition — standard supply and service condition: maximum room- and elevated-temperature strength and creep resistance. SA: pick for forming, machining of complex features or welding before the final ageing cycle. Yield strength is 1,030 MPa in STA versus 450 MPa in SA.
How much does N07773 cost?
N07773 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
- Metals & Alloys in the Unified Numbering System (UNS), N07xxx nickel alloys — SAE International / ASTM (2023)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (heat-resistant nickel alloys) — ASM International (1990)
- Superalloys: A Technical Guide, 2nd ed. — ASM International (2002)
- ASTM B637 — Precipitation-Hardening Nickel Alloy Bars, Forgings and Forging Stock for High-Temperature Service — ASTM (2018)
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.