Titanium Grade 3-O vs Grade 3-SR
Titanium · Grade 3 temper comparison
Grade 3-O and Grade 3-SR are two conditions of the same titanium grade, Grade 3: O (annealed) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Grade 3-SR is the stronger of the two: yield strength 540 MPa (78.3 ksi) against 420 MPa (60.9 ksi) for Grade 3-O, about 29% more; tensile strength follows at 620 MPa (89.9 ksi) vs 500 MPa (72.5 ksi). In exchange, Grade 3-O is the more ductile: elongation 20% versus 15% for Grade 3-SR, and Grade 3-SR is harder (235 HB vs 200 HB).
Grade 3-OChoose it when the part is bent, formed or impact-loaded.
Grade 3-SRChoose it when strength drives the design.
Grade 3-O vs Grade 3-SR: 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)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 103 GPa14.9 Msi · Shear Modulus 45 GPa6.5 Msi · Bulk Modulus 110 GPa16 Msi · Poisson's Ratio 0.34 · Compressive Strength 450 MPa65.3 ksi · Shear Strength 380 MPa55.1 ksi · Fracture Toughness (K_IC) 70 MPa·√m63.7 ksi·√in · Charpy V-Notch Impact (RT) 24 J17.7 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 4.51 g/cm³0.16 lb/in³ · Melting Point (Solidus) 1,660°C3,020 °F · Liquidus Temperature 1,668°C3,034 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 16.4 W/m·K9.5 BTU/hr·ft·°F · Specific Heat Capacity 523 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 8.6 µm/m·K4.8 µin/in·°F · Latent Heat of Fusion 300 J/g129 BTU/lb · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 92 / 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 %) 28% · Weldability 85 / 100 · Castability 35 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 690 MJ/kg296,647 BTU/lb · Embodied Carbon (primary production) 46 kg CO₂/kg · Embodied Water 1,000 L/kg120 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.
Grade 3-O vs Grade 3-SR — frequently asked
Is Grade 3-SR stronger than Grade 3-O?
Yes. Grade 3-SR has a typical yield strength of 540 MPa (78.3 ksi) against 420 MPa (60.9 ksi) for Grade 3-O — about 29% more. Tensile strength is 620 MPa (89.9 ksi) vs 500 MPa (72.5 ksi).
Which condition does FabDigit quote by default, O or SR?
O is the default Grade 3 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 Grade 3-O over Grade 3-SR?
Pick Grade 3-O when the part is bent, formed or impact-loaded. Pick Grade 3-SR when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Grade 3-O and Grade 3-SR 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.