Nickel Alloy N07773-HF
Grade
UNS N07773
HF = hot worked / as-forged, unaged
Mill condition for forging stock and oversize bar that will be re-heat-treated by the part maker.
Values for the HF condition
Other N07773 tempers and conditions
N07773 is listed in 5 conditions; see the grade overview at N07773.
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 |
HFThis page 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-HF?
N07773-HF is N07773 in the HF grade — mill condition for forging stock and oversize bar that will be re-heat-treated by the part maker. N07773-HF has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi). N07773-HF 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). STA is the default condition FabDigit quotes; HF is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 81% of nickel alloy grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 75% of nickel alloy grades
N07773-HF properties
Typical room-temperature values for N07773-HF; 23 are specific to this condition. Other listed values are N07773 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
N07773-HF 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-HF has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
N07773-HF is rated for continuous service to 650°C (1,202 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), better than 65% of nickel alloy grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
N07773-HF conducts electricity at 1.4 % IACS, worse than 80% 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-HF 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-HF's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability fair (50/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N07773-HF
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.
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.
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 |
N07773-HF — frequently asked
What is N07773-HF used for?
N07773-HF 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-HF?
N07773-HF has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 81% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is N07773-HF easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% 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-HF be welded?
With care — weldability is rated fair (50/100). 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-HF?
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-HF 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-HF?
N07773-HF 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.