Titanium Ti-6Al-2Sn-4Zr-6Mo-ST vs Ti-6Al-2Sn-4Zr-6Mo-STA
Titanium · Ti-6Al-2Sn-4Zr-6Mo temper comparison
Ti-6Al-2Sn-4Zr-6Mo-ST and Ti-6Al-2Sn-4Zr-6Mo-STA are two conditions of the same titanium grade, Ti-6Al-2Sn-4Zr-6Mo: ST (solution annealed) versus STA (solution treated and aged). 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 900 MPa (131 ksi) for Ti-6Al-2Sn-4Zr-6Mo-ST, about 22% more; tensile strength follows at 1,170 MPa (170 ksi) vs 970 MPa (141 ksi). In exchange, Ti-6Al-2Sn-4Zr-6Mo-ST is the more ductile: elongation 15% versus 10% for Ti-6Al-2Sn-4Zr-6Mo-STA, and Ti-6Al-2Sn-4Zr-6Mo-STA is harder (350 HB vs 305 HB). Ti-6Al-2Sn-4Zr-6Mo-STA runs hotter in service (400°C vs 315°C continuous). On the shop floor, Ti-6Al-2Sn-4Zr-6Mo-ST welds better (fair vs poor).
Ti-6Al-2Sn-4Zr-6Mo-STChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Ti-6Al-2Sn-4Zr-6Mo-STAChoose it when strength drives the design, or when the part sees heat.
Ti-6Al-2Sn-4Zr-6Mo-ST vs Ti-6Al-2Sn-4Zr-6Mo-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-6Mo-STTi-6Al-2Sn-4Zr-6Mo-STA
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-STA — frequently asked
Is Ti-6Al-2Sn-4Zr-6Mo-STA stronger than Ti-6Al-2Sn-4Zr-6Mo-ST?
Yes. Ti-6Al-2Sn-4Zr-6Mo-STA has a typical yield strength of 1,100 MPa (160 ksi) against 900 MPa (131 ksi) for Ti-6Al-2Sn-4Zr-6Mo-ST — about 22% more. Tensile strength is 1,170 MPa (170 ksi) vs 970 MPa (141 ksi).
Which condition does FabDigit quote by default, ST or STA?
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.
Which welds better, Ti-6Al-2Sn-4Zr-6Mo-ST or Ti-6Al-2Sn-4Zr-6Mo-STA?
Ti-6Al-2Sn-4Zr-6Mo-ST. Its weldability rates fair (40/100) against poor (30/100) for Ti-6Al-2Sn-4Zr-6Mo-STA.
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-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.