Nickel Alloy N07776
UNS N07776
N07776 is a wrought, precipitation-hardened nickel-chromium-iron superalloy (UNS N07776) in the same family as 718 and Waspaloy, used where strength must be retained at temperature.
Reference datasheet — N07776 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
N07776 tempers and conditions
N07776 is supplied in 6 conditions, soft to hard. STA is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Pick for forming, machining of complex shapes and welding before final ageing. | 420 | 850 | 48 | 200 HB | — |
CW+A 120 ksi | Lowest strength level of the oil-country / sour-service bar grades, chosen when maximum toughness and SSC margin are wanted. | 880 | 1,170 | 25 | 32 HRC | 1.4 % IACS |
Hot finished / hot worked and directly aged | Pick for large forged or hot-rolled sections where a full solution treat is impractical; slightly lower and more scattered properties than STA. | 965 | 1,240 | 20 | 35 HRC | 1.4 % IACS |
STADefault Solution treated and aged | Standard delivered condition for high-strength turbine, fastener and downhole components. | 1,010 | 1,300 | 22 | 36 HRC | — |
CW+A 140 ksi | Common downhole/completion bar strength level balancing strength and environmental cracking resistance. | 1,015 | 1,240 | 20 | 36 HRC | 1.4 % IACS |
CW+A 150 ksi | Highest standard strength level for heavily loaded fasteners and tools; least ductility and tightest hardness cap for sour service. | 1,090 | 1,320 | 17 | 39 HRC | 1.4 % IACS |
What is N07776?
N07776 is a wrought, precipitation-hardened nickel-chromium-iron superalloy (UNS N07776) in the same family as 718 and Waspaloy, used where strength must be retained at temperature. Aged material gives 1010 MPa yield, 1300 MPa tensile, 22 % elongation and 340 HB (36 HRC) with service to about 650 °C, and is available solution-annealed, solution-treated-and-aged, hot-finished-and-aged, and in cold-worked-plus-aged strength levels (CW+A-120/140/150). Limits are poor machinability (score 15), moderate weldability (40) and low formability (25); fully aged stock risks strain-age cracking, so machine, form and weld in the solution-annealed condition. Alloy 718 is the nearest widely stocked substitute. N07776 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 52% of nickel alloy grades. It melts at 1,265°C (2,309 °F). N07776 has a yield strength of 1,010 MPa (146 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 96% of nickel alloy grades. Elongation at break is 22% and the elastic modulus is 204 GPa (29.6 Msi).
What is N07776 used for?
- turbine discs
- aerospace structural parts
- high-temperature fasteners
Advantages
- High strength — 1,010 MPa (146 ksi), better than 96% of nickel alloy grades
N07776 properties
Typical room-temperature values for N07776-STA; bars are the position among nickel alloy grades.
Physical3
N07776 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 52% of nickel alloy grades. It melts at 1,265°C (2,309 °F).
Mechanical15
N07776 has a yield strength of 1,010 MPa (146 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 96% of nickel alloy grades. Elongation at break is 22% and the elastic modulus is 204 GPa (29.6 Msi).
Thermal6
N07776 is rated for continuous service to 650°C (1,202 °F). It conducts heat at 10.8 W/m·K (6.24 BTU/hr·ft·°F), worse than 66% of nickel alloy grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
N07776 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 77% of nickel alloy grades.
Sustainability4
Producing a kilogram of N07776 takes about 215 MJ of energy and emits 14.5 kg of CO₂ — more than 84% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability7
N07776's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability fair (40/100); formability poor (25/100).
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. N07776 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N07776
Is N07776 easy to machine?
Machine in the solution-annealed state where possible; use rigid setups, positive-rake carbide or ceramic tools, low speed/heavy feed, flood high-pressure coolant, and avoid dwelling to prevent severe work hardening.
Can N07776 be welded?
GTAW/EBW in the solution-annealed condition with matching or Ni-Cr-Mo filler, low heat input and interpass control, then re-solution and age; welding fully aged material risks strain-age and HAZ liquation cracking.
Can N07776 be formed, bent or molded?
Hot work in the ~1000–1150 °C range with adequate finishing strain; cold forming only in the annealed temper with high tooling loads, generous radii and interstage anneals.
N07776 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 |
|---|---|---|
| Niapproximate for this Ni-Cr-Fe PH class; confirm against order spec | 50 – 60 | 56 |
| Crprovides passivity / pitting resistance | 19 – 23 | 21 |
| Mosolid-solution strengthener, crevice/pitting resistance | 7 – 9.5 | 8 |
| Nbγ″ former | 2.5 – 4.5 | 3.4 |
| Tiγ′ former | 1 – 1.7 | 1.4 |
| Al | 0 – 0.7 | 0.3 |
| C | ≤ 0.03 | 0.02 |
| Mn | ≤ 0.35 | |
| Si | ≤ 0.2 | |
| S | ≤ 0.01 | |
| P | ≤ 0.02 | |
| Cu | ≤ 0.5 | |
| Febalance, typically 6–12 % | balance |
What surface finishes work on N07776?
Not anodizable — pickle/passivate or electropolish for corrosion service; shot peening improves fatigue and SCC life, and electroless Ni or PVD coatings can be used for galling control.
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 N07776 cost?
N07776 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.
N07776 — frequently asked
What is N07776 used for?
N07776 is typically used for turbine discs, aerospace structural parts and high-temperature fasteners. In short: aged strength to 1300 MPa; hot strength to 650 °C; hard to machine, weld annealed.
What is the yield strength of N07776?
N07776 has a typical yield strength of 1,010 MPa (146 ksi) and a tensile strength of 1,300 MPa (189 ksi) — stronger than 96% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is N07776 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; use rigid setups, positive-rake carbide or ceramic tools, low speed/heavy feed, flood high-pressure coolant, and avoid dwelling to prevent severe work hardening.
Can N07776 be welded?
With care — weldability is rated fair (40/100). GTAW/EBW in the solution-annealed condition with matching or Ni-Cr-Mo filler, low heat input and interpass control, then re-solution and age; welding fully aged material risks strain-age and HAZ liquation cracking.
What surface finishes work on N07776?
Not anodizable — pickle/passivate or electropolish for corrosion service; shot peening improves fatigue and SCC life, and electroless Ni or PVD coatings can be used for galling control.
Can N07776 be formed, bent or molded?
Hot work in the ~1000–1150 °C range with adequate finishing strain; cold forming only in the annealed temper with high tooling loads, generous radii and interstage anneals.
What is the maximum service temperature of N07776?
N07776 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 N07776-STA and N07776-SA?
STA is the default condition — standard delivered condition for high-strength turbine, fastener and downhole components. SA: pick for forming, machining of complex shapes and welding before final ageing. Yield strength is 1,010 MPa in STA versus 420 MPa in SA.
How much does N07776 cost?
N07776 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
- ASTM B637 — Precipitation-Hardening Nickel Alloy Bars, Forgings and Forging Stock for High-Temperature Service — ASTM International (2018)
- ASTM B805 / API 6ACRA — age-hardened corrosion-resistant nickel alloy bar for oil and gas service — ASTM International / API (2020)
- SAE/ASTM DS-56 Metals & Alloys in the Unified Numbering System (UNS) — SAE International (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Age-hardenable Ni-Cr-Mo alloy bar datasheets (INCONEL 725/718 class) — Special Metals / VDM Metals (2022)
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.