Titanium Ti Grade 35-ST vs Ti Grade 35-STA
Titanium · Ti Grade 35 temper comparison
Ti Grade 35-ST and Ti Grade 35-STA are two conditions of the same titanium grade, Ti Grade 35: ST (solution annealed) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Ti Grade 35-STA is the stronger of the two: yield strength 1,200 MPa (174 ksi) against 830 MPa (120 ksi) for Ti Grade 35-ST, about 45% more; tensile strength follows at 1,290 MPa (187 ksi) vs 900 MPa (131 ksi). In exchange, Ti Grade 35-ST is the more ductile: elongation 20% versus 9% for Ti Grade 35-STA, and Ti Grade 35-STA is harder (315 HB vs 285 HB). Ti Grade 35-ST runs hotter in service (350°C vs 315°C continuous). On the shop floor, Ti Grade 35-ST welds better (very good vs good).
Ti Grade 35-STChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Ti Grade 35-STAChoose it when strength drives the design.
Ti Grade 35-ST vs Ti Grade 35-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.
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 105 GPa15.2 Msi · Poisson's Ratio 0.32
Physical
Density and transition temperatures.
Same in both: Density 4.54 g/cm³0.16 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 530 J/kg·K0.13 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 -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1 % IACS · Electrical Resistivity 1.7×10⁻⁶ Ω·m66.9 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 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 45 / 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) 44 kg CO₂/kg · Embodied Water 480 L/kg57.5 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 Grade 35-ST vs Ti Grade 35-STA — frequently asked
Is Ti Grade 35-STA stronger than Ti Grade 35-ST?
Yes. Ti Grade 35-STA has a typical yield strength of 1,200 MPa (174 ksi) against 830 MPa (120 ksi) for Ti Grade 35-ST — about 45% more. Tensile strength is 1,290 MPa (187 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, ST or STA?
Annealed is the default Ti Grade 35 condition in the FabDigit quote flow (neither ST 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 is easier to machine, Ti Grade 35-ST or Ti Grade 35-STA?
Ti Grade 35-ST. Its machinability rates poor (20/100) against not recommended (14/100) for Ti Grade 35-STA; for welding the order is Ti Grade 35-ST first (very good, 75/100) then Ti Grade 35-STA (good, 55/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti Grade 35-ST and Ti Grade 35-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.