Titanium Ti-6Al-2Sn-4Zr-6Mo-STA vs Ti-6Al-2Sn-4Zr-6Mo STOA
Titanium · Ti-6Al-2Sn-4Zr-6Mo temper comparison
Ti-6Al-2Sn-4Zr-6Mo-STA and Ti-6Al-2Sn-4Zr-6Mo STOA are two conditions of the same titanium grade, Ti-6Al-2Sn-4Zr-6Mo: STA (solution treated and aged) versus STOA (solution treated and overaged). The chemistry is identical, so every difference below comes from the condition. Ti-6Al-2Sn-4Zr-6Mo-STA is the stronger of the two: yield strength 1,100 MPa (160 ksi) against 1,020 MPa (148 ksi) for Ti-6Al-2Sn-4Zr-6Mo STOA, about 8% more; tensile strength follows at 1,170 MPa (170 ksi) vs 1,100 MPa (160 ksi). In exchange, Ti-6Al-2Sn-4Zr-6Mo STOA is the more ductile: elongation 12% versus 10% for Ti-6Al-2Sn-4Zr-6Mo-STA, and Ti-6Al-2Sn-4Zr-6Mo-STA is harder (350 HB vs 331 HB).
Ti-6Al-2Sn-4Zr-6Mo-STAChoose it when strength drives the design.
Ti-6Al-2Sn-4Zr-6Mo STOAChoose it when the part is bent, formed or impact-loaded.
Ti-6Al-2Sn-4Zr-6Mo-STA vs Ti-6Al-2Sn-4Zr-6Mo 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-6Al-2Sn-4Zr-6Mo-STATi-6Al-2Sn-4Zr-6Mo STOA
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 114 GPa16.5 Msi · Shear Modulus 43 GPa6.2 Msi · Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 4.65 g/cm³0.17 lb/in³ · Melting Point (Solidus) 1,590°C2,894 °F · Liquidus Temperature 1,650°C3,002 °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 480 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 8 µm/m·K4.4 µin/in·°F · Latent Heat of Fusion 365 J/g157 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1 % IACS · Electrical Resistivity 1.8×10⁻⁶ Ω·m70.9 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 88 / 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: Brazeability / Solderability 35 / 100 · 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) 42 kg CO₂/kg · Embodied Water 1,000 L/kg120 gal/lb · Typical Recycled Content 25%
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-6Al-2Sn-4Zr-6Mo-STA vs Ti-6Al-2Sn-4Zr-6Mo STOA — frequently asked
Is Ti-6Al-2Sn-4Zr-6Mo-STA stronger than Ti-6Al-2Sn-4Zr-6Mo STOA?
Yes. Ti-6Al-2Sn-4Zr-6Mo-STA has a typical yield strength of 1,100 MPa (160 ksi) against 1,020 MPa (148 ksi) for Ti-6Al-2Sn-4Zr-6Mo STOA — about 8% more. Tensile strength is 1,170 MPa (170 ksi) vs 1,100 MPa (160 ksi).
Which condition does FabDigit quote by default, STA or STOA?
STA is the default Ti-6Al-2Sn-4Zr-6Mo 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 Ti-6Al-2Sn-4Zr-6Mo-STA over Ti-6Al-2Sn-4Zr-6Mo STOA?
Pick Ti-6Al-2Sn-4Zr-6Mo-STA when strength drives the design. Pick Ti-6Al-2Sn-4Zr-6Mo STOA when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-6Al-2Sn-4Zr-6Mo-STA and Ti-6Al-2Sn-4Zr-6Mo 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.