Titanium Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA vs Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA
Titanium · Ti-6Al-2Sn-4Zr-2Mo-0.1Si temper comparison
Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA and Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA are two conditions of the same titanium grade, Ti-6Al-2Sn-4Zr-2Mo-0.1Si: Beta STOA (beta solution treated, cooled and overaged/stabilised) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 900 MPa (131 ksi) for Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA, about 11% more; tensile strength follows at 1,100 MPa (160 ksi) vs 1,000 MPa (145 ksi). Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA is harder — 35 HRC against 33 HRC for Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA — which matters for wear surfaces and threads. Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA runs hotter in service (540°C vs 480°C continuous).
Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOAChoose it when the part sees heat.
Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STAChoose it when strength drives the design, or when surface hardness matters.
Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA vs Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA: 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-2Mo-0.1Si Beta STOATi-6Al-2Sn-4Zr-2Mo-0.1Si-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)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 114 GPa16.5 Msi · Shear Modulus 44.5 GPa6.5 Msi · Bulk Modulus 107 GPa15.5 Msi · Poisson's Ratio 0.32 · Charpy V-Notch Impact (RT) 20 J14.8 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 4.54 g/cm³0.16 lb/in³ · Melting Point (Solidus) 1,650°C3,002 °F · Liquidus Temperature 1,705°C3,101 °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 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 7.7 µm/m·K4.3 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 0.87 % IACS · Electrical Resistivity 1.98×10⁻⁶ Ω·m78 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: Castability 30 / 100 · Brazeability / Solderability 35 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 680 MJ/kg292,348 BTU/lb · Embodied Carbon (primary production) 40 kg CO₂/kg · Embodied Water 800 L/kg95.9 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-2Mo-0.1Si Beta STOA vs Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA — frequently asked
Is Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA stronger than Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA?
Yes. Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA has a typical yield strength of 1,000 MPa (145 ksi) against 900 MPa (131 ksi) for Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA — about 11% more. Tensile strength is 1,100 MPa (160 ksi) vs 1,000 MPa (145 ksi).
Which condition does FabDigit quote by default, Beta STOA or STA?
Duplex Annealed is the default Ti-6Al-2Sn-4Zr-2Mo-0.1Si condition in the FabDigit quote flow (neither Beta STOA nor STA). 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-2Mo-0.1Si Beta STOA or Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA?
Ti-6Al-2Sn-4Zr-2Mo-0.1Si-STA. Its weldability rates good (65/100) against good (60/100) for Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-6Al-2Sn-4Zr-2Mo-0.1Si Beta STOA and Ti-6Al-2Sn-4Zr-2Mo-0.1Si-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.