Titanium Ti-8Mo-8V-2Fe-3Al-ST vs Ti-8Mo-8V-2Fe-3Al STOA
Titanium · Ti-8Mo-8V-2Fe-3Al temper comparison
Ti-8Mo-8V-2Fe-3Al-ST and Ti-8Mo-8V-2Fe-3Al STOA are two conditions of the same titanium grade, Ti-8Mo-8V-2Fe-3Al: ST (solution annealed) versus STOA (solution treated and overaged). The chemistry is identical, so every difference below comes from the condition. Ti-8Mo-8V-2Fe-3Al STOA is the stronger of the two: yield strength 1,060 MPa (154 ksi) against 860 MPa (125 ksi) for Ti-8Mo-8V-2Fe-3Al-ST, about 23% more; tensile strength follows at 1,130 MPa (164 ksi) vs 900 MPa (131 ksi). In exchange, Ti-8Mo-8V-2Fe-3Al-ST is the more ductile: elongation 16% versus 11% for Ti-8Mo-8V-2Fe-3Al STOA, and Ti-8Mo-8V-2Fe-3Al STOA is harder (370 HB vs 280 HB). Ti-8Mo-8V-2Fe-3Al STOA is stiffer (110 GPa vs 100 GPa) and Ti-8Mo-8V-2Fe-3Al STOA runs hotter in service (315°C vs 200°C continuous). On the shop floor, Ti-8Mo-8V-2Fe-3Al-ST welds better (good vs fair).
Ti-8Mo-8V-2Fe-3Al-STChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Ti-8Mo-8V-2Fe-3Al STOAChoose it when strength drives the design, or when the part sees heat.
Ti-8Mo-8V-2Fe-3Al-ST vs Ti-8Mo-8V-2Fe-3Al STOA: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all titanium 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 titanium 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.
Ti-8Mo-8V-2Fe-3Al-STTi-8Mo-8V-2Fe-3Al STOA
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 42 GPa6.1 Msi · Bulk Modulus 108 GPa15.7 Msi · Poisson's Ratio 0.33 · Compressive Strength 1,300 MPa189 ksi
Physical
Density and transition temperatures.
Same in both: Density 4.9 g/cm³0.18 lb/in³ · Melting Point (Solidus) 1,600°C2,912 °F · Liquidus Temperature 1,650°C3,002 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 6.5 W/m·K3.8 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9.2 µm/m·K5.1 µin/in·°F · Latent Heat of Fusion 360 J/g155 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.2 % IACS · Electrical Resistivity 1.45×10⁻⁶ Ω·m57.1 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 85 / 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: Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 700 MJ/kg300,946 BTU/lb · Embodied Carbon (primary production) 45 kg CO₂/kg · Embodied Water 400 L/kg47.9 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every titanium grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Ti-8Mo-8V-2Fe-3Al-ST vs Ti-8Mo-8V-2Fe-3Al STOA — frequently asked
Is Ti-8Mo-8V-2Fe-3Al STOA stronger than Ti-8Mo-8V-2Fe-3Al-ST?
Yes. Ti-8Mo-8V-2Fe-3Al STOA has a typical yield strength of 1,060 MPa (154 ksi) against 860 MPa (125 ksi) for Ti-8Mo-8V-2Fe-3Al-ST — about 23% more. Tensile strength is 1,130 MPa (164 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, ST or STOA?
STA is the default Ti-8Mo-8V-2Fe-3Al condition in the FabDigit quote flow (neither ST nor STOA). 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, Ti-8Mo-8V-2Fe-3Al-ST or Ti-8Mo-8V-2Fe-3Al STOA?
Ti-8Mo-8V-2Fe-3Al-ST. Its weldability rates good (55/100) against fair (35/100) for Ti-8Mo-8V-2Fe-3Al STOA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-8Mo-8V-2Fe-3Al-ST and Ti-8Mo-8V-2Fe-3Al STOA 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.