Titanium Grade C-5-AC vs Grade C-5-STA
Titanium · Grade C-5 temper comparison
Grade C-5-AC and Grade C-5-STA are two conditions of the same titanium grade, Grade C-5: AC (spheroidize annealed) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Grade C-5-STA is the stronger of the two: yield strength 970 MPa (141 ksi) against 840 MPa (122 ksi) for Grade C-5-AC, about 15% more; tensile strength follows at 1,070 MPa (155 ksi) vs 910 MPa (132 ksi). In exchange, Grade C-5-AC is the more ductile: elongation 7% versus 6% for Grade C-5-STA, and Grade C-5-STA is harder (360 HB vs 325 HB). Grade C-5-STA runs hotter in service (400°C vs 350°C continuous). On the shop floor, Grade C-5-STA welds better (65 vs 55 out of 100).
Grade C-5-ACChoose it when the part is bent, formed or impact-loaded.
Grade C-5-STAChoose it when strength drives the design, or when the part sees heat.
Grade C-5-AC vs Grade C-5-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
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: Elastic (Young's) Modulus 112 GPa16.2 Msi · Shear Modulus 43 GPa6.2 Msi · Bulk Modulus 110 GPa16 Msi · Poisson's Ratio 0.34 · Reduction in Area 12%
Physical
Density and transition temperatures.
Same in both: Density 4.43 g/cm³0.16 lb/in³ · Melting Point (Solidus) 1,604°C2,919 °F · Liquidus Temperature 1,650°C3,002 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 6.8 W/m·K3.9 BTU/hr·ft·°F · Specific Heat Capacity 560 J/kg·K0.13 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 8.7 µm/m·K4.8 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Min Service Temperature -196°C-321 °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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V
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 70 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 660 MJ/kg283,749 BTU/lb · Embodied Carbon (primary production) 44 kg CO₂/kg · Embodied Water 1,100 L/kg132 gal/lb · Typical Recycled Content 40%
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.
Grade C-5-AC vs Grade C-5-STA — frequently asked
Is Grade C-5-STA stronger than Grade C-5-AC?
Yes. Grade C-5-STA has a typical yield strength of 970 MPa (141 ksi) against 840 MPa (122 ksi) for Grade C-5-AC — about 15% more. Tensile strength is 1,070 MPa (155 ksi) vs 910 MPa (132 ksi).
Which condition does FabDigit quote by default, AC or STA?
HIP is the default Grade C-5 condition in the FabDigit quote flow (neither AC 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 welds better, Grade C-5-AC or Grade C-5-STA?
Grade C-5-STA. Its weldability rates good (65/100) against good (55/100) for Grade C-5-AC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Grade C-5-AC and Grade C-5-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.