Nickel Alloy Nimonic 80A HF+A vs Nimonic 80A-ST
Nickel Alloy · Nimonic 80A temper comparison
Nimonic 80A HF+A and Nimonic 80A-ST are two conditions of the same nickel alloy grade, Nimonic 80A: HF+A (hot forged / hot rolled and precipitation hardened) versus ST (solution annealed). The chemistry is identical, so every difference below comes from the condition. Nimonic 80A HF+A is the stronger of the two: yield strength 730 MPa (106 ksi) against 320 MPa (46.4 ksi) for Nimonic 80A-ST, about 128% more; tensile strength follows at 1,120 MPa (162 ksi) vs 800 MPa (116 ksi). In exchange, Nimonic 80A-ST is the more ductile: elongation 45% versus 22% for Nimonic 80A HF+A, and Nimonic 80A HF+A is harder (335 HB vs 185 HB). Nimonic 80A HF+A runs hotter in service (800°C vs 700°C continuous). On the shop floor, Nimonic 80A-ST welds better (fair vs poor).
Nimonic 80A HF+AChoose it when strength drives the design, or when the part sees heat.
Nimonic 80A-STChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Nimonic 80A HF+A vs Nimonic 80A-ST: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all nickel alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all nickel alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Nimonic 80A HF+ANimonic 80A-ST
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 222 GPa32.2 Msi · Shear Modulus 85 GPa12.3 Msi · Bulk Modulus 180 GPa26.1 Msi · Poisson's Ratio 0.31
Physical
Density and transition temperatures.
Same in both: Density 8.19 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,360°C2,480 °F · Liquidus Temperature 1,390°C2,534 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 11.2 W/m·K6.5 BTU/hr·ft·°F · Specific Heat Capacity 448 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.7 µm/m·K7.1 µin/in·°F · Latent Heat of Fusion 290 J/g125 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.4 % IACS · Electrical Resistivity 1.24×10⁻⁶ Ω·m48.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.13 V · Corrosion Resistance 75 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 13.5 kg CO₂/kg · Embodied Water 1,400 L/kg168 gal/lb · Typical Recycled Content 35%
Strength versus weight
Yield strength against density for every nickel alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Nimonic 80A HF+A vs Nimonic 80A-ST — frequently asked
Is Nimonic 80A HF+A stronger than Nimonic 80A-ST?
Yes. Nimonic 80A HF+A has a typical yield strength of 730 MPa (106 ksi) against 320 MPa (46.4 ksi) for Nimonic 80A-ST — about 128% more. Tensile strength is 1,120 MPa (162 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, HF+A or ST?
STA is the default Nimonic 80A condition in the FabDigit quote flow (neither HF+A nor ST). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, Nimonic 80A HF+A or Nimonic 80A-ST?
Nimonic 80A-ST. Its machinability rates poor (22/100) against not recommended (13/100) for Nimonic 80A HF+A; for welding the order is Nimonic 80A-ST first (fair, 45/100) then Nimonic 80A HF+A (poor, 28/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Nimonic 80A HF+A and Nimonic 80A-ST side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.