Titanium Ti-5553-ST vs Ti-5553-STA
Titanium · Ti-5553 temper comparison
Ti-5553-ST and Ti-5553-STA are two conditions of the same titanium grade, Ti-5553: ST (solution annealed) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Ti-5553-STA is the stronger of the two: yield strength 1,150 MPa (167 ksi) against 830 MPa (120 ksi) for Ti-5553-ST, about 39% more; tensile strength follows at 1,230 MPa (178 ksi) vs 890 MPa (129 ksi). In exchange, Ti-5553-ST is the more ductile: elongation 20% versus 9% for Ti-5553-STA, and Ti-5553-STA is harder (370 HB vs 305 HB). Ti-5553-STA is stiffer (112 GPa vs 98 GPa) and Ti-5553-STA runs hotter in service (300°C vs 200°C continuous).
Ti-5553-STChoose it when the part is bent, formed or impact-loaded.
Ti-5553-STAChoose it when strength drives the design, or when the part sees heat.
Ti-5553-ST vs Ti-5553-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 40 GPa5.8 Msi · Bulk Modulus 105 GPa15.2 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) 1,580°C2,876 °F · Liquidus Temperature 1,640°C2,984 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 7 W/m·K4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9.3 µm/m·K5.2 µin/in·°F · Latent Heat of Fusion 360 J/g155 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 88 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 16% · Weldability 35 / 100 · Castability 25 / 100 · Brazeability / Solderability 30 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 650 MJ/kg279,450 BTU/lb · Embodied Carbon (primary production) 42 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-5553-ST vs Ti-5553-STA — frequently asked
Is Ti-5553-STA stronger than Ti-5553-ST?
Yes. Ti-5553-STA has a typical yield strength of 1,150 MPa (167 ksi) against 830 MPa (120 ksi) for Ti-5553-ST — about 39% more. Tensile strength is 1,230 MPa (178 ksi) vs 890 MPa (129 ksi).
Which condition does FabDigit quote by default, ST or STA?
O is the default Ti-5553 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-5553-ST or Ti-5553-STA?
Ti-5553-ST. Its machinability rates poor (20/100) against not recommended (13/100) for Ti-5553-STA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-5553-ST and Ti-5553-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.