Nickel Alloy Inconel X-750-EQ vs Inconel X-750-STA
Nickel Alloy · Inconel X-750 temper comparison
Inconel X-750-EQ and Inconel X-750-STA are two conditions of the same nickel alloy grade, Inconel X-750: EQ (equalized) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Inconel X-750-STA is the stronger of the two: yield strength 815 MPa (118 ksi) against 480 MPa (69.6 ksi) for Inconel X-750-EQ, about 70% more; tensile strength follows at 1,200 MPa (174 ksi) vs 900 MPa (131 ksi). In exchange, Inconel X-750-EQ is the more ductile: elongation 35% versus 25% for Inconel X-750-STA, and Inconel X-750-STA is harder (302 HB vs 220 HB). On the shop floor, Inconel X-750-EQ welds better (good vs fair).
Inconel X-750-EQChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Inconel X-750-STAChoose it when strength drives the design.
Inconel X-750-EQ vs Inconel X-750-STA: 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.
Inconel X-750-EQInconel X-750-STA
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
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 214 GPa31 Msi · Shear Modulus 83 GPa12 Msi · Bulk Modulus 170 GPa24.7 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 8.28 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,393°C2,539 °F · Liquidus Temperature 1,427°C2,601 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 431 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.6 µm/m·K7 µin/in·°F · Latent Heat of Fusion 290 J/g125 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.05 V · Corrosion Resistance 80 / 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: Castability 30 / 100 · Brazeability / Solderability 50 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 190 MJ/kg81,685 BTU/lb · Embodied Carbon (primary production) 13 kg CO₂/kg · Embodied Water 800 L/kg95.9 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.
Inconel X-750-EQ vs Inconel X-750-STA — frequently asked
Is Inconel X-750-STA stronger than Inconel X-750-EQ?
Yes. Inconel X-750-STA has a typical yield strength of 815 MPa (118 ksi) against 480 MPa (69.6 ksi) for Inconel X-750-EQ — about 70% more. Tensile strength is 1,200 MPa (174 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, EQ or STA?
STA is the default Inconel X-750 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.
Which is easier to machine, Inconel X-750-EQ or Inconel X-750-STA?
Inconel X-750-EQ, by a small margin. Both rate poor for machinability — 20/100 against 15/100 for Inconel X-750-STA; for welding the order is Inconel X-750-EQ first (good, 55/100) then Inconel X-750-STA (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Inconel X-750-EQ and Inconel X-750-STA 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.