Titanium Ti Grade 38 HR-ANN vs Ti Grade 38-STA
Titanium · Ti Grade 38 temper comparison
Ti Grade 38 HR-ANN and Ti Grade 38-STA are two conditions of the same titanium grade, Ti Grade 38: HR-ANN (hot Rolled + Annealed) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Ti Grade 38-STA is the stronger of the two: yield strength 1,010 MPa (146 ksi) against 790 MPa (115 ksi) for Ti Grade 38 HR-ANN, about 28% more; tensile strength follows at 1,100 MPa (160 ksi) vs 880 MPa (128 ksi). In exchange, Ti Grade 38 HR-ANN is the more ductile: elongation 16% versus 10% for Ti Grade 38-STA, and Ti Grade 38-STA is harder (340 HB vs 285 HB). Ti Grade 38 HR-ANN runs hotter in service (400°C vs 350°C continuous).
Ti Grade 38 HR-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Ti Grade 38-STAChoose it when strength drives the design.
Ti Grade 38 HR-ANN vs Ti Grade 38-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.
Ti Grade 38 HR-ANNTi Grade 38-STA
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 C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 105 GPa15.2 Msi · Shear Modulus 40 GPa5.8 Msi · Bulk Modulus 108 GPa15.7 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 4.48 g/cm³0.16 lb/in³ · Melting Point (Solidus) 1,620°C2,948 °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 7 W/m·K4 BTU/hr·ft·°F · Specific Heat Capacity 530 J/kg·K0.13 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9 µm/m·K5 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).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 85 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 70 / 100 · Castability 25 / 100 · Brazeability / Solderability 40 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 620 MJ/kg266,552 BTU/lb · Embodied Carbon (primary production) 40 kg CO₂/kg · Embodied Water 320 L/kg38.3 gal/lb · Typical Recycled Content 35%
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 38 HR-ANN vs Ti Grade 38-STA — frequently asked
Is Ti Grade 38-STA stronger than Ti Grade 38 HR-ANN?
Yes. Ti Grade 38-STA has a typical yield strength of 1,010 MPa (146 ksi) against 790 MPa (115 ksi) for Ti Grade 38 HR-ANN — about 28% more. Tensile strength is 1,100 MPa (160 ksi) vs 880 MPa (128 ksi).
Which condition does FabDigit quote by default, HR-ANN or STA?
Annealed is the default Ti Grade 38 condition in the FabDigit quote flow (neither HR-ANN 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 is easier to machine, Ti Grade 38 HR-ANN or Ti Grade 38-STA?
Ti Grade 38 HR-ANN, by a small margin. Both rate poor for machinability — 25/100 against 18/100 for Ti Grade 38-STA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti Grade 38 HR-ANN and Ti Grade 38-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.