Titanium Ti Grade 18 Annealed vs Ti Grade 18-TB
Titanium · Ti Grade 18 temper comparison
Ti Grade 18 Annealed and Ti Grade 18-TB are two conditions of the same titanium grade, Ti Grade 18: Annealed versus TB (transformed beta). The chemistry is identical, so every difference below comes from the condition. Ti Grade 18-TB is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 570 MPa (82.7 ksi) for Ti Grade 18 Annealed, about 9% more. In exchange, Ti Grade 18 Annealed is the more ductile: elongation 20% versus 12% for Ti Grade 18-TB, and Ti Grade 18-TB is harder (270 HB vs 240 HB). Ti Grade 18-TB runs hotter in service (370°C vs 315°C continuous).
Ti Grade 18 AnnealedChoose it when the part is bent, formed or impact-loaded.
Ti Grade 18-TBChoose it when strength drives the design, or when the part sees heat.
Ti Grade 18 Annealed vs Ti Grade 18-TB: 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 18 AnnealedTi Grade 18-TB
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
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 44 GPa6.4 Msi · Bulk Modulus 105 GPa15.2 Msi · Poisson's Ratio 0.32 · Compressive Strength 590 MPa85.6 ksi
Physical
Density and transition temperatures.
Same in both: Density 4.48 g/cm³0.16 lb/in³ · Melting Point (Solidus) 1,650°C3,002 °F · Liquidus Temperature 1,704°C3,099 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 7.6 W/m·K4.4 BTU/hr·ft·°F · Specific Heat Capacity 540 J/kg·K0.13 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9.4 µm/m·K5.2 µin/in·°F · Latent Heat of Fusion 365 J/g157 BTU/lb · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.4 % IACS · Electrical Resistivity 1.26×10⁻⁶ Ω·m49.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 93 / 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 35 / 100 · Brazeability / Solderability 45 / 100 · Polishability 65 / 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 320 L/kg38.3 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 Grade 18 Annealed vs Ti Grade 18-TB — frequently asked
Is Ti Grade 18-TB stronger than Ti Grade 18 Annealed?
Yes. Ti Grade 18-TB has a typical yield strength of 620 MPa (89.9 ksi) against 570 MPa (82.7 ksi) for Ti Grade 18 Annealed — about 9% more. Tensile strength is 720 MPa (104 ksi) vs 690 MPa (100 ksi).
Which condition does FabDigit quote by default, Annealed or TB?
Annealed is the default Ti Grade 18 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 Ti Grade 18 Annealed over Ti Grade 18-TB?
Pick Ti Grade 18 Annealed when the part is bent, formed or impact-loaded. Pick Ti Grade 18-TB when strength drives the design, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti Grade 18 Annealed and Ti Grade 18-TB 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.