Nickel Alloy Nimonic 115-AF (As-forged / as-hot-rolled)
Finish state
UNS N07115 · EN 2.4662
Mill product form for re-forging or for parts that will receive the full ST+A cycle afterwards.
Values for the AF condition
Other Nimonic 115 tempers and conditions
Nimonic 115 is listed in 4 conditions; see the grade overview at Nimonic 115.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest practical condition, supplied when the customer will machine then age in-house. | 600 | 960 | 33 | 25 HRC | — |
AFThis page As-forged / as-hot-rolled | Mill product form for re-forging or for parts that will receive the full ST+A cycle afterwards. | 720 | 1,100 | 20 | 32 HRC | 1.2 % IACS |
Investment cast, solution treated and aged | Equiaxed investment-cast blades/vanes: better creep life at temperature but lower ductility than wrought. | 800 | 1,030 | 9 | 37 HRC | — |
ST+ADefault Solution treated 1190 °C/1.5 h AC + aged 1100 °C/6 h AC | Standard supplied condition for wrought bar, billet and turbine forgings — maximum creep-rupture strength to ~1000 °C. | 865 | 1,240 | 25 | 39 HRC | — |
What is Nimonic 115-AF?
Nimonic 115-AF is Nimonic 115 supplied in the AF condition — mill product form for re-forging or for parts that will receive the full ST+A cycle afterwards. Nimonic 115-AF has a yield strength of 720 MPa (104 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 82% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 220 GPa (31.9 Msi). Nimonic 115-AF has a density of 7.85 g/cm³ (0.284 lb/in³), lighter than 95% of nickel alloy grades. It melts at 1,290°C (2,354 °F). ST+A is the default condition FabDigit quotes; AF is available on request or by drawing note.
Advantages
- High strength — 720 MPa (104 ksi), better than 82% of nickel alloy grades
Limitations
- Low electrical conductivity — 1.2 % IACS, worse than 99% of nickel alloy grades
- Difficult to weld — 10/100, worse than 94% of nickel alloy grades
- High embodied carbon — 15 kg CO₂/kg, worse than 87% of nickel alloy grades
- Limited formability — 13/100, worse than 82% of nickel alloy grades
- Limited ductility — 20%, worse than 76% of nickel alloy grades
Nimonic 115-AF properties
Typical room-temperature values for Nimonic 115-AF; 22 are specific to this condition. Other listed values are Nimonic 115 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Nimonic 115-AF has a density of 7.85 g/cm³ (0.284 lb/in³), lighter than 95% of nickel alloy grades. It melts at 1,290°C (2,354 °F).
Mechanical15
Nimonic 115-AF has a yield strength of 720 MPa (104 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 82% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 220 GPa (31.9 Msi).
Thermal6
Nimonic 115-AF is rated for continuous service to 815°C (1,499 °F). It conducts heat at 10.7 W/m·K (6.18 BTU/hr·ft·°F), worse than 68% of nickel alloy grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
Nimonic 115-AF conducts electricity at 1.2 % IACS, worse than 99% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), worse than 59% of nickel alloy grades.
Sustainability4
Producing a kilogram of Nimonic 115-AF takes about 210 MJ of energy and emits 15 kg of CO₂ — more than 81% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability8
Nimonic 115-AF's machinability is not recommended (12/100, worse than 86% of nickel alloy grades); weldability not recommended (10/100); formability not recommended (13/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Nimonic 115-AF
Is Nimonic 115 easy to machine?
Extremely difficult in the aged condition — use rigid setups, positive-rake carbide or whisker-reinforced ceramic inserts, low surface speed with high feed, flood coolant and constant depth of cut to avoid work-hardened glaze; grinding and EDM are common for blade features.
Can Nimonic 115 be welded?
Essentially non-weldable by conventional fusion methods due to ~5 % Al + ~4 % Ti (strain-age/liquation cracking); repairs use vacuum brazing, wide-gap brazing or highly controlled preheated laser/EB processes with post-weld ST+A.
Can Nimonic 115 be formed, bent or molded?
Hot work only, in a narrow 1050–1160 °C window with rapid reheating; cold forming is impractical, and investment casting is the usual route for complex airfoils.
What surface finishes work on Nimonic 115?
Typically shot-peened and coated with pack/vapour aluminide or MCrAlY for hot-section service; polishes well but passivation/anodizing is not applicable.
Nimonic 115 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 |
|---|---|---|
| C | 0.12 – 0.2 | 0.15 |
| Cr | 14 – 16 | 14.3 |
| Co | 13 – 15.5 | 13.2 |
| Mo | 3 – 5 | 3.3 |
| Alprincipal γ′ former | 4.5 – 5.5 | 4.9 |
| Tiprincipal γ′ former | 3.5 – 4.5 | 3.7 |
| Fe | ≤ 1 | 0.5 |
| Mn | ≤ 1 | — |
| Si | ≤ 1 | — |
| Cu | ≤ 0.2 | — |
| Zrgrain-boundary strengthener | 0.02 – 0.1 | 0.04 |
| Bhigh B level as listed in ASM superalloy tables; some specs limit to ≤0.02 | 0.01 – 0.2 | 0.16 |
| S | ≤ 0.02 | — |
| Nibalance, ~60 % | balance | — |
Nimonic 115-AF — frequently asked
What is Nimonic 115-AF used for?
Nimonic 115-AF is typically used for turbine blades, hot-section fasteners and high-temperature discs. In short: highest gamma-prime Nimonic; service to 980 °C; essentially non-weldable superalloy.
What is the yield strength of Nimonic 115-AF?
Nimonic 115-AF has a typical yield strength of 720 MPa (104 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 82% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Nimonic 115-AF easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 86% of nickel alloy grades). Extremely difficult in the aged condition — use rigid setups, positive-rake carbide or whisker-reinforced ceramic inserts, low surface speed with high feed, flood coolant and constant depth of cut to avoid work-hardened glaze; grinding and EDM are common for blade features.
Can Nimonic 115-AF be welded?
Not readily — weldability is rated not recommended (10/100). Essentially non-weldable by conventional fusion methods due to ~5 % Al + ~4 % Ti (strain-age/liquation cracking); repairs use vacuum brazing, wide-gap brazing or highly controlled preheated laser/EB processes with post-weld ST+A.
What surface finishes work on Nimonic 115-AF?
Typically shot-peened and coated with pack/vapour aluminide or MCrAlY for hot-section service; polishes well but passivation/anodizing is not applicable.
Can Nimonic 115-AF be formed, bent or molded?
Hot work only, in a narrow 1050–1160 °C window with rapid reheating; cold forming is impractical, and investment casting is the usual route for complex airfoils.
What is the maximum service temperature of Nimonic 115-AF?
Nimonic 115-AF 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 115 ST+A and Nimonic 115-ST?
ST+A is the default condition — standard supplied condition for wrought bar, billet and turbine forgings — maximum creep-rupture strength to ~1000 °C. ST: softest practical condition, supplied when the customer will machine then age in-house. Yield strength is 865 MPa in ST+A versus 600 MPa in ST.
Sources
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (superalloy data) — ASM International (1990)
- Superalloys: A Technical Guide, 2nd ed. — ASM International (2002)
- Nimonic alloy series technical data — Special Metals Corporation (2020)
- UNS N07115 / Werkstoff 2.4662 designation listings — SAE/ASTM DS-56 & DIN (2019)
- GH115/Nimonic 115 (2025)
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.