Titanium Ti Grade 38-CW vs Ti Grade 38-STA
Titanium · Ti Grade 38 temper comparison
Ti Grade 38-CW and Ti Grade 38-STA are two conditions of the same titanium grade, Ti Grade 38: CW (cold worked) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Both yield at about 970 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (cold worked versus solution treated and aged). Ti Grade 38-STA is the more ductile: elongation 10% versus 7% for Ti Grade 38-CW, and Ti Grade 38-STA is harder (340 HB vs 320 HB). Ti Grade 38-STA runs hotter in service (350°C vs 300°C continuous). On the shop floor, Ti Grade 38-STA welds better (very good vs good).
Ti Grade 38-STAChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Ti Grade 38-CW 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.
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)
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 · Fracture Toughness (K_IC) 55 MPa·√m50.1 ksi·√in
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.
Electrical Resistivity
Same in both: Electrical Conductivity 1 % IACS
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 %)
Weldability
Formability (cold)
Same in both: 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-CW vs Ti Grade 38-STA — frequently asked
What is the difference between Ti Grade 38-CW and Ti Grade 38-STA?
Ti Grade 38-CW and Ti Grade 38-STA are two conditions of the same titanium grade, Ti Grade 38: CW (cold worked) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Both yield at about 970 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (cold worked versus solution treated and aged).
Which condition does FabDigit quote by default, CW or STA?
Annealed is the default Ti Grade 38 condition in the FabDigit quote flow (neither CW 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 welds better, Ti Grade 38-CW or Ti Grade 38-STA?
Ti Grade 38-STA. Its weldability rates very good (70/100) against good (60/100) for Ti Grade 38-CW.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti Grade 38-CW 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.