Titanium Ti-3Al-8V-6Cr-4Mo-4Zr-ST vs Ti-3Al-8V-6Cr-4Mo-4Zr-STA
Titanium · Ti-3Al-8V-6Cr-4Mo-4Zr temper comparison
Ti-3Al-8V-6Cr-4Mo-4Zr-ST and Ti-3Al-8V-6Cr-4Mo-4Zr-STA are two conditions of the same titanium grade, Ti-3Al-8V-6Cr-4Mo-4Zr: ST (solution annealed) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Ti-3Al-8V-6Cr-4Mo-4Zr-STA is the stronger of the two: yield strength 1,240 MPa (180 ksi) against 850 MPa (123 ksi) for Ti-3Al-8V-6Cr-4Mo-4Zr-ST, about 46% more; tensile strength follows at 1,300 MPa (189 ksi) vs 900 MPa (131 ksi). In exchange, Ti-3Al-8V-6Cr-4Mo-4Zr-ST is the more ductile: elongation 18% versus 8% for Ti-3Al-8V-6Cr-4Mo-4Zr-STA, and Ti-3Al-8V-6Cr-4Mo-4Zr-STA is harder (42 HRC vs 32 HRC). Ti-3Al-8V-6Cr-4Mo-4Zr-STA is stiffer (103 GPa vs 86 GPa) and Ti-3Al-8V-6Cr-4Mo-4Zr-STA runs hotter in service (260°C vs 200°C continuous). On the shop floor, Ti-3Al-8V-6Cr-4Mo-4Zr-ST welds better (good vs fair).
Ti-3Al-8V-6Cr-4Mo-4Zr-STChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Ti-3Al-8V-6Cr-4Mo-4Zr-STAChoose it when strength drives the design, or when the part sees heat.
Ti-3Al-8V-6Cr-4Mo-4Zr-ST vs Ti-3Al-8V-6Cr-4Mo-4Zr-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-3Al-8V-6Cr-4Mo-4Zr-STTi-3Al-8V-6Cr-4Mo-4Zr-STA
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear 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, Rockwell C
Hardness, Vickers
Same in both: Bulk Modulus 90 GPa13.1 Msi · Poisson's Ratio 0.32
Physical
Density and transition temperatures.
Same in both: Density 4.82 g/cm³0.17 lb/in³ · Melting Point (Solidus) 1,650°C3,002 °F · Liquidus Temperature 1,700°C3,092 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 7.6 W/m·K4.4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9.4 µm/m·K5.2 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 1.1 % IACS · Electrical Resistivity 1.55×10⁻⁶ Ω·m61 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 92 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 15% · Castability 20 / 100 · 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) 45 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-3Al-8V-6Cr-4Mo-4Zr-ST vs Ti-3Al-8V-6Cr-4Mo-4Zr-STA — frequently asked
Is Ti-3Al-8V-6Cr-4Mo-4Zr-STA stronger than Ti-3Al-8V-6Cr-4Mo-4Zr-ST?
Yes. Ti-3Al-8V-6Cr-4Mo-4Zr-STA has a typical yield strength of 1,240 MPa (180 ksi) against 850 MPa (123 ksi) for Ti-3Al-8V-6Cr-4Mo-4Zr-ST — about 46% more. Tensile strength is 1,300 MPa (189 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, ST or STA?
ST is the default Ti-3Al-8V-6Cr-4Mo-4Zr 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-3Al-8V-6Cr-4Mo-4Zr-ST or Ti-3Al-8V-6Cr-4Mo-4Zr-STA?
Ti-3Al-8V-6Cr-4Mo-4Zr-ST. Its weldability rates good (60/100) against fair (45/100) for Ti-3Al-8V-6Cr-4Mo-4Zr-STA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-3Al-8V-6Cr-4Mo-4Zr-ST and Ti-3Al-8V-6Cr-4Mo-4Zr-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.