Nickel Alloy N09777-DA (Direct aged)
Heat-treated state
UNS N09777
Pick when the finer as-forged grain size is wanted for higher yield strength and fatigue life at some loss of ductility.
Values for the DA condition
Other N09777 tempers and conditions
N09777 is listed in 4 conditions; see the grade overview at N09777.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest condition — choose for machining, cold forming, welding or forging stock before final ageing. | 480 | 830 | 35 | 200 HB | — |
Cold drawn | Cold-worked bar, wire or strip supplied for close tolerance and finish; age after machining to develop final properties. | 830 | 1,030 | 15 | 32 HRC | 1.7 % IACS |
STADefault Solution treated and aged | Standard delivered/engineering condition — full γ″/η precipitation strength with low, linear expansion for turbine casings, seals and rings. | 1,000 | 1,275 | 15 | 40 HRC | — |
DAThis page Direct aged | Pick when the finer as-forged grain size is wanted for higher yield strength and fatigue life at some loss of ductility. | 1,100 | 1,380 | 12 | 43 HRC | — |
What is N09777-DA?
N09777-DA is N09777 heat treated to DA — pick when the finer as-forged grain size is wanted for higher yield strength and fatigue life at some loss of ductility. N09777-DA has a yield strength of 1,100 MPa (160 ksi) and a tensile strength of 1,380 MPa (200 ksi) — stronger than 98% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 160 GPa (23.2 Msi). N09777-DA has a density of 8.14 g/cm³ (0.294 lb/in³), lighter than 74% of nickel alloy grades. It melts at 1,345°C (2,453 °F). STA is the default condition FabDigit quotes; DA is available on request or by drawing note.
Advantages
- High strength — 1,100 MPa (160 ksi), better than 98% of nickel alloy grades
- High electrical conductivity — 1.8 % IACS, better than 82% of nickel alloy grades
Limitations
- High embodied carbon — 17 kg CO₂/kg, worse than 96% of nickel alloy grades
- Needs corrosion protection — 40/100, worse than 95% of nickel alloy grades
- Low stiffness — 160 GPa (23.2 Msi), worse than 92% of nickel alloy grades
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 85% of nickel alloy grades
- Limited ductility — 12%, worse than 83% of nickel alloy grades
N09777-DA properties
Typical room-temperature values for N09777-DA; 12 are specific to this condition. Other listed values are N09777 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
N09777-DA has a density of 8.14 g/cm³ (0.294 lb/in³), lighter than 74% of nickel alloy grades. It melts at 1,345°C (2,453 °F).
Mechanical14
N09777-DA has a yield strength of 1,100 MPa (160 ksi) and a tensile strength of 1,380 MPa (200 ksi) — stronger than 98% of nickel alloy grades. Elongation at break is 12% and the elastic modulus is 160 GPa (23.2 Msi).
Thermal6
N09777-DA is rated for continuous service to 620°C (1,148 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), better than 71% of nickel alloy grades. Thermal expansion is 7.4 µm/m·K (4.11 µin/in·°F).
Electrical3
N09777-DA conducts electricity at 1.8 % IACS, better than 82% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (40/100), worse than 95% of nickel alloy grades.
Sustainability4
Producing a kilogram of N09777-DA takes about 230 MJ of energy and emits 17 kg of CO₂ — more than 91% of nickel alloy grades. Typical recycled content is 25%.
Manufacturability7
N09777-DA's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability fair (40/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N09777-DA
Is N09777 easy to machine?
Machine in the solution-annealed state where possible; rigid setups, positive-rake carbide or ceramic tools, low surface speed (~15–25 m/min carbide in aged material), heavy feed and flood coolant to avoid work hardening and glazing.
Can N09777 be welded?
GTAW/EBW in the solution-annealed condition with matched or Nb-bearing filler; keep heat input low, avoid restraint, and re-solution + double age after welding to restore strength and expansion behaviour.
Can N09777 be formed, bent or molded?
Hot work 900–1120 °C with finishing below 1010 °C for fine grain; cold forming only from the annealed condition with intermediate anneals — aged material is essentially non-formable.
What surface finishes work on N09777?
Not anodizable; grind/polish with the low thermal conductivity in mind, and use aluminide, thermal-barrier or plated coatings where wet-corrosion or long-term oxidation protection is required.
N09777 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 |
|---|---|---|
| Ni | 24 – 26 | 25 |
| Co | 28 – 31 | 29 |
| Cradded for oxidation / SAGBO resistance | 5 – 6 | 5.5 |
| Nbprincipal γ″ former (Nb+Ta) | 4.4 – 5.2 | 4.8 |
| Ti | 0.6 – 1 | 0.85 |
| Al | 0.3 – 0.7 | 0.5 |
| Si | 0.15 – 0.5 | 0.35 |
| C | ≤ 0.05 | 0.03 |
| Mn | ≤ 0.5 | — |
| B | ≤ 0.01 | 0.01 |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Febalance, approx. 32–36 % | balance | — |
N09777-DA — frequently asked
What is N09777-DA used for?
N09777-DA is typically used for gas turbine casings, seal rings and aerospace low-expansion structural parts. In short: low expansion, high strength; aged to 40 HRC; needs coatings for corrosion.
What is the yield strength of N09777-DA?
N09777-DA has a typical yield strength of 1,100 MPa (160 ksi) and a tensile strength of 1,380 MPa (200 ksi) — stronger than 98% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is N09777-DA easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Machine in the solution-annealed state where possible; rigid setups, positive-rake carbide or ceramic tools, low surface speed (~15–25 m/min carbide in aged material), heavy feed and flood coolant to avoid work hardening and glazing.
Can N09777-DA be welded?
With care — weldability is rated fair (40/100). GTAW/EBW in the solution-annealed condition with matched or Nb-bearing filler; keep heat input low, avoid restraint, and re-solution + double age after welding to restore strength and expansion behaviour.
What surface finishes work on N09777-DA?
Not anodizable; grind/polish with the low thermal conductivity in mind, and use aluminide, thermal-barrier or plated coatings where wet-corrosion or long-term oxidation protection is required.
Can N09777-DA be formed, bent or molded?
Hot work 900–1120 °C with finishing below 1010 °C for fine grain; cold forming only from the annealed condition with intermediate anneals — aged material is essentially non-formable.
What is the maximum service temperature of N09777-DA?
N09777-DA is rated for continuous use to about 620°C (1,148 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N09777-STA and N09777-SA?
STA is the default condition — standard delivered/engineering condition — full γ″/η precipitation strength with low, linear expansion for turbine casings, seals and rings. SA: softest condition — choose for machining, cold forming, welding or forging stock before final ageing. Yield strength is 1,000 MPa in STA versus 480 MPa in SA.
Sources
- Controlled-expansion Fe-Ni-Co-Cr superalloy (Thermo-Span type) technical datasheet — Carpenter Technology (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (low-expansion superalloys) — ASM International (1990)
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
- Metals & Alloys in the Unified Numbering System (UNS N09777) — SAE/ASTM (2017)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.