Titanium Ti-6Al-2Sn-4Zr-6Mo-ST vs Ti-6Al-2Sn-4Zr-6Mo STOA
Titanium · Ti-6Al-2Sn-4Zr-6Mo temper comparison
Ti-6Al-2Sn-4Zr-6Mo-ST and Ti-6Al-2Sn-4Zr-6Mo STOA are two conditions of the same titanium grade, Ti-6Al-2Sn-4Zr-6Mo: ST (solution annealed) versus STOA (solution treated and overaged). The chemistry is identical, so every difference below comes from the condition. Ti-6Al-2Sn-4Zr-6Mo STOA is the stronger of the two: yield strength 1,020 MPa (148 ksi) against 900 MPa (131 ksi) for Ti-6Al-2Sn-4Zr-6Mo-ST, about 13% more; tensile strength follows at 1,100 MPa (160 ksi) vs 970 MPa (141 ksi). In exchange, Ti-6Al-2Sn-4Zr-6Mo-ST is the more ductile: elongation 15% versus 12% for Ti-6Al-2Sn-4Zr-6Mo STOA, and Ti-6Al-2Sn-4Zr-6Mo STOA is harder (331 HB vs 305 HB). Ti-6Al-2Sn-4Zr-6Mo STOA runs hotter in service (425°C vs 315°C continuous).
Ti-6Al-2Sn-4Zr-6Mo-STChoose it when the part is bent, formed or impact-loaded.
Ti-6Al-2Sn-4Zr-6Mo STOAChoose it when strength drives the design, or when the part sees heat.
Ti-6Al-2Sn-4Zr-6Mo-ST 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-STTi-6Al-2Sn-4Zr-6Mo 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
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: 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.
Electrical Conductivity
Electrical Resistivity
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-ST vs Ti-6Al-2Sn-4Zr-6Mo STOA — frequently asked
Is Ti-6Al-2Sn-4Zr-6Mo STOA stronger than Ti-6Al-2Sn-4Zr-6Mo-ST?
Yes. Ti-6Al-2Sn-4Zr-6Mo STOA has a typical yield strength of 1,020 MPa (148 ksi) against 900 MPa (131 ksi) for Ti-6Al-2Sn-4Zr-6Mo-ST — about 13% more. Tensile strength is 1,100 MPa (160 ksi) vs 970 MPa (141 ksi).
Which condition does FabDigit quote by default, ST or STOA?
STA is the default Ti-6Al-2Sn-4Zr-6Mo 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-6Al-2Sn-4Zr-6Mo-ST or Ti-6Al-2Sn-4Zr-6Mo STOA?
Ti-6Al-2Sn-4Zr-6Mo-ST. Its weldability rates fair (40/100) against poor (32/100) for Ti-6Al-2Sn-4Zr-6Mo STOA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-6Al-2Sn-4Zr-6Mo-ST 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.