Titanium ERTi-5-SR vs ERTi-5-STA
Titanium · ERTi-5 temper comparison
ERTi-5-SR and ERTi-5-STA are two conditions of the same titanium grade, ERTi-5: SR (stress relieved) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. ERTi-5-STA is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 880 MPa (128 ksi) for ERTi-5-SR, about 14% more; tensile strength follows at 1,100 MPa (160 ksi) vs 950 MPa (138 ksi). In exchange, ERTi-5-SR is the more ductile: elongation 10% versus 6% for ERTi-5-STA, and ERTi-5-STA is harder (375 HB vs 320 HB). ERTi-5-SR runs hotter in service (400°C vs 350°C continuous).
ERTi-5-SRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ERTi-5-STAChoose it when strength drives the design.
ERTi-5-SR vs ERTi-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
Reduction in Area
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 113 GPa16.4 Msi · Shear Modulus 44 GPa6.4 Msi · Bulk Modulus 110 GPa16 Msi · Poisson's Ratio 0.34 · Compressive Strength 970 MPa141 ksi · Shear Strength 580 MPa84.1 ksi
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 1,660°C3,020 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 6.7 W/m·K3.9 BTU/hr·ft·°F · Specific Heat Capacity 526 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 365 J/g157 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).
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.
Same in both: Machinability 20 / 100 · Machinability Rating (AISI 1212 = 100 %) 22% · Weldability 70 / 100 · Formability (cold) 30 / 100 · Castability 45 / 100 · Brazeability / Solderability 35 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 650 MJ/kg279,450 BTU/lb · Embodied Carbon (primary production) 40 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 15%
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.
ERTi-5-SR vs ERTi-5-STA — frequently asked
Is ERTi-5-STA stronger than ERTi-5-SR?
Yes. ERTi-5-STA has a typical yield strength of 1,000 MPa (145 ksi) against 880 MPa (128 ksi) for ERTi-5-SR — about 14% more. Tensile strength is 1,100 MPa (160 ksi) vs 950 MPa (138 ksi).
Which condition does FabDigit quote by default, SR or STA?
AW is the default ERTi-5 condition in the FabDigit quote flow (neither SR 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.
When should I choose ERTi-5-SR over ERTi-5-STA?
Pick ERTi-5-SR when the part is bent, formed or impact-loaded, or when the part sees heat. Pick ERTi-5-STA when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ERTi-5-SR and ERTi-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.