Titanium Ti-17-AF vs Ti-17-STA
Titanium · Ti-17 temper comparison
Ti-17-AF and Ti-17-STA are two conditions of the same titanium grade, Ti-17: AF (as-forged / mill-annealed billet and bar) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Ti-17-STA is the stronger of the two: yield strength 1,075 MPa (156 ksi) against 930 MPa (135 ksi) for Ti-17-AF, about 16% more; tensile strength follows at 1,150 MPa (167 ksi) vs 1,020 MPa (148 ksi). In exchange, Ti-17-AF is the more ductile: elongation 12% versus 10% for Ti-17-STA, and Ti-17-STA is harder (37 HRC vs 33 HRC).
Ti-17-AFChoose it when the part is bent, formed or impact-loaded.
Ti-17-STAChoose it when strength drives the design.
Ti-17-AF vs Ti-17-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.
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: Elastic (Young's) Modulus 112 GPa16.2 Msi · Shear Modulus 42.5 GPa6.2 Msi · Bulk Modulus 104 GPa15.1 Msi · Poisson's Ratio 0.32
Physical
Density and transition temperatures.
Same in both: Density 4.65 g/cm³0.17 lb/in³ · Melting Point (Solidus) 1,600°C2,912 °F · Liquidus Temperature 1,650°C3,002 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: 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 325 J/g140 BTU/lb · Max Service Temperature (continuous) 350°C662 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: 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: 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) 42 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 20%
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-17-AF vs Ti-17-STA — frequently asked
Is Ti-17-STA stronger than Ti-17-AF?
Yes. Ti-17-STA has a typical yield strength of 1,075 MPa (156 ksi) against 930 MPa (135 ksi) for Ti-17-AF — about 16% more. Tensile strength is 1,150 MPa (167 ksi) vs 1,020 MPa (148 ksi).
Which condition does FabDigit quote by default, AF or STA?
STA is the default Ti-17 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.
When should I choose Ti-17-AF over Ti-17-STA?
Pick Ti-17-AF when the part is bent, formed or impact-loaded. Pick Ti-17-STA when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-17-AF and Ti-17-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.