Nickel Alloy 718Plus-STA vs 718Plus STA-SS
Nickel Alloy · 718Plus temper comparison
718Plus-STA and 718Plus STA-SS are two conditions of the same nickel alloy grade, 718Plus: STA (solution treated and aged) versus STA-SS (super-solvus solution (1010–1038 °C) + double age). The chemistry is identical, so every difference below comes from the condition. 718Plus-STA is the stronger of the two: yield strength 1,220 MPa (177 ksi) against 1,130 MPa (164 ksi) for 718Plus STA-SS, about 8% more; tensile strength follows at 1,480 MPa (215 ksi) vs 1,380 MPa (200 ksi). 718Plus-STA is the more ductile: elongation 17% versus 14% for 718Plus STA-SS, and 718Plus-STA is harder (440 HV vs 412 HV).
718Plus-STAChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
718Plus-STA vs 718Plus STA-SS: 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)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 197 GPa28.6 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 158 GPa22.9 Msi · Poisson's Ratio 0.29 · Compressive Strength 1,250 MPa181 ksi · Shear Strength 900 MPa131 ksi · Charpy V-Notch Impact (RT) 32 J23.6 ft·lbf · Hardness, Brinell 415 HB
Physical
Density and transition temperatures.
Same in both: Density 8.22 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,260°C2,300 °F · Liquidus Temperature 1,345°C2,453 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 10.9 W/m·K6.3 BTU/hr·ft·°F · Specific Heat Capacity 435 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.8 µm/m·K7.1 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.4 % IACS · Electrical Resistivity 1.22×10⁻⁶ Ω·m48 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 72 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Same in both: Machinability 12 / 100 · Machinability Rating (AISI 1212 = 100 %) 10% · Weldability 55 / 100 · Formability (cold) 10 / 100 · Castability 25 / 100 · Brazeability / Solderability 45 / 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 350 L/kg41.9 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.
718Plus-STA vs 718Plus STA-SS — frequently asked
Is 718Plus-STA stronger than 718Plus STA-SS?
Yes. 718Plus-STA has a typical yield strength of 1,220 MPa (177 ksi) against 1,130 MPa (164 ksi) for 718Plus STA-SS — about 8% more. Tensile strength is 1,480 MPa (215 ksi) vs 1,380 MPa (200 ksi).
Which condition does FabDigit quote by default, STA or STA-SS?
STA is the default 718Plus condition in the FabDigit quote flow. 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.
When should I choose 718Plus-STA over 718Plus STA-SS?
Pick 718Plus-STA when strength drives the design, or when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 718Plus-STA and 718Plus STA-SS 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.