Nickel Alloy X-750 EQ-A vs X-750-STA
Nickel Alloy · X-750 temper comparison
X-750 EQ-A and X-750-STA are two conditions of the same nickel alloy grade, X-750: EQ-A (equalized + aged) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. X-750 EQ-A is the stronger of the two: yield strength 860 MPa (125 ksi) against 815 MPa (118 ksi) for X-750-STA, about 6% more; tensile strength follows at 1,275 MPa (185 ksi) vs 1,200 MPa (174 ksi). X-750 EQ-A is harder — 331 HB against 302 HB for X-750-STA — which matters for wear surfaces and threads. X-750-STA runs hotter in service (760°C vs 650°C continuous).
X-750 EQ-AChoose it when strength drives the design, or when surface hardness matters.
X-750-STAChoose it when the part sees heat.
X-750 EQ-A vs 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.
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)
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 188 GPa27.3 Msi · Poisson's Ratio 0.31 · Compressive Strength 840 MPa122 ksi · Shear Strength 730 MPa106 ksi · Fracture Toughness (K_IC) 100 MPa·√m91 ksi·√in
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 12 W/m·K6.9 BTU/hr·ft·°F · 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.
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 78 / 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 35 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 290 MJ/kg124,678 BTU/lb · Embodied Carbon (primary production) 17.5 kg CO₂/kg · Embodied Water 300 L/kg35.9 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.
X-750 EQ-A vs X-750-STA — frequently asked
Is X-750 EQ-A stronger than X-750-STA?
Yes. X-750 EQ-A has a typical yield strength of 860 MPa (125 ksi) against 815 MPa (118 ksi) for X-750-STA — about 6% more. Tensile strength is 1,275 MPa (185 ksi) vs 1,200 MPa (174 ksi).
Which condition does FabDigit quote by default, EQ-A or STA?
STA is the default 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 welds better, X-750 EQ-A or X-750-STA?
X-750-STA. Its weldability rates fair (40/100) against fair (35/100) for X-750 EQ-A.
Ready to make it?
Upload a CAD file and FabDigit prices the part in X-750 EQ-A and 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.