Titanium Ti Grade 31 Annealed vs Ti Grade 31 CW-SR
Titanium · Ti Grade 31 temper comparison
Ti Grade 31 Annealed and Ti Grade 31 CW-SR are two conditions of the same titanium grade, Ti Grade 31: Annealed versus CW-SR (cold Worked + Stress Relieved). The chemistry is identical, so every difference below comes from the condition. Ti Grade 31 CW-SR is the stronger of the two: yield strength 600 MPa (87 ksi) against 450 MPa (65.3 ksi) for Ti Grade 31 Annealed, about 33% more; tensile strength follows at 690 MPa (100 ksi) vs 550 MPa (79.8 ksi). In exchange, Ti Grade 31 Annealed is the more ductile: elongation 22% versus 13% for Ti Grade 31 CW-SR, and Ti Grade 31 CW-SR is harder (240 HB vs 200 HB). Ti Grade 31 Annealed runs hotter in service (300°C vs 250°C continuous).
Ti Grade 31 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Ti Grade 31 CW-SRChoose it when strength drives the design.
Ti Grade 31 Annealed vs Ti Grade 31 CW-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.
Ti Grade 31 AnnealedTi Grade 31 CW-SR
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, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 105 GPa15.2 Msi · Shear Modulus 45 GPa6.5 Msi · Bulk Modulus 110 GPa16 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 4.51 g/cm³0.16 lb/in³ · Melting Point (Solidus) 1,650°C3,002 °F · Liquidus Temperature 1,670°C3,038 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 17 W/m·K9.8 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 365 J/g157 BTU/lb · Min Service Temperature -250°C-418 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 95 / 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: Castability 30 / 100 · Brazeability / Solderability 40 / 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 1,500 L/kg180 gal/lb · Typical Recycled Content 30%
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 Grade 31 Annealed vs Ti Grade 31 CW-SR — frequently asked
Is Ti Grade 31 CW-SR stronger than Ti Grade 31 Annealed?
Yes. Ti Grade 31 CW-SR has a typical yield strength of 600 MPa (87 ksi) against 450 MPa (65.3 ksi) for Ti Grade 31 Annealed — about 33% more. Tensile strength is 690 MPa (100 ksi) vs 550 MPa (79.8 ksi).
Which condition does FabDigit quote by default, Annealed or CW-SR?
Annealed is the default Ti Grade 31 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.
Which welds better, Ti Grade 31 Annealed or Ti Grade 31 CW-SR?
Ti Grade 31 Annealed. Its weldability rates excellent (88/100) against very good (80/100) for Ti Grade 31 CW-SR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti Grade 31 Annealed and Ti Grade 31 CW-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.