Nickel Alloy IN-718 Cast-AC vs IN-718 Cast-HIP
Nickel Alloy · IN-718 Cast temper comparison
IN-718 Cast-AC and IN-718 Cast-HIP are two conditions of the same nickel alloy grade, IN-718 Cast: AC (spheroidize annealed) versus HIP (hot isostatic pressed). The chemistry is identical, so every difference below comes from the condition. IN-718 Cast-AC is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 400 MPa (58 ksi) for IN-718 Cast-HIP, about 18% more. In exchange, IN-718 Cast-HIP is the more ductile: elongation 25% versus 8% for IN-718 Cast-AC, and IN-718 Cast-AC is harder (270 HB vs 200 HB). IN-718 Cast-HIP runs hotter in service (600°C vs 540°C continuous). On the shop floor, IN-718 Cast-HIP welds better (very good vs good).
IN-718 Cast-ACChoose it when strength drives the design.
IN-718 Cast-HIPChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
IN-718 Cast-AC vs IN-718 Cast-HIP: 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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 197 GPa28.6 Msi · Shear Modulus 76 GPa11 Msi · Bulk Modulus 158 GPa22.9 Msi · Poisson's Ratio 0.29 · Compressive Strength 880 MPa128 ksi · Shear Strength 650 MPa94.3 ksi · Hardness, Vickers 375 HV
Physical
Density and transition temperatures.
Same in both: Density 8.19 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,260°C2,300 °F · Liquidus Temperature 1,336°C2,437 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 11.4 W/m·K6.6 BTU/hr·ft·°F · Specific Heat Capacity 435 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 13 µm/m·K7.2 µin/in·°F · Latent Heat of Fusion 225 J/g96.7 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.4 % IACS · Electrical Resistivity 1.25×10⁻⁶ Ω·m49.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 76 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Same in both: Formability (cold) 8 / 100 · Castability 68 / 100 · Brazeability / Solderability 55 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 215 MJ/kg92,433 BTU/lb · Embodied Carbon (primary production) 14.5 kg CO₂/kg · Embodied Water 400 L/kg47.9 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.
IN-718 Cast-AC vs IN-718 Cast-HIP — frequently asked
Is IN-718 Cast-AC stronger than IN-718 Cast-HIP?
Yes. IN-718 Cast-AC has a typical yield strength of 470 MPa (68.2 ksi) against 400 MPa (58 ksi) for IN-718 Cast-HIP — about 18% more. Tensile strength is 760 MPa (110 ksi) vs 830 MPa (120 ksi).
Which condition does FabDigit quote by default, AC or HIP?
HT is the default IN-718 Cast condition in the FabDigit quote flow (neither AC nor HIP). 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 welds better, IN-718 Cast-AC or IN-718 Cast-HIP?
IN-718 Cast-HIP. Its weldability rates very good (72/100) against good (62/100) for IN-718 Cast-AC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in IN-718 Cast-AC and IN-718 Cast-HIP 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.