Titanium Ti Grade 20-ST vs Ti Grade 20 STA-HS
Titanium · Ti Grade 20 temper comparison
Ti Grade 20-ST and Ti Grade 20 STA-HS are two conditions of the same titanium grade, Ti Grade 20: ST (solution annealed) versus STA-HS (STA). The chemistry is identical, so every difference below comes from the condition. Ti Grade 20 STA-HS is the stronger of the two: yield strength 1,210 MPa (175 ksi) against 820 MPa (119 ksi) for Ti Grade 20-ST, about 48% more; tensile strength follows at 1,290 MPa (187 ksi) vs 860 MPa (125 ksi). In exchange, Ti Grade 20-ST is the more ductile: elongation 18% versus 7% for Ti Grade 20 STA-HS, and Ti Grade 20 STA-HS is harder (42 HRC vs 30 HRC). Ti Grade 20 STA-HS is stiffer (105 GPa vs 95 GPa) and Ti Grade 20 STA-HS runs hotter in service (315°C vs 260°C continuous). On the shop floor, Ti Grade 20-ST welds better (good vs poor).
Ti Grade 20-STChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Ti Grade 20 STA-HSChoose it when strength drives the design, or when the part sees heat.
Ti Grade 20-ST vs Ti Grade 20 STA-HS: 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 20-STTi Grade 20 STA-HS
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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 40 GPa5.8 Msi · Bulk Modulus 100 GPa14.5 Msi · Poisson's Ratio 0.32
Physical
Density and transition temperatures.
Same in both: Density 4.82 g/cm³0.17 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 6.8 W/m·K3.9 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 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 -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.2 % IACS · Electrical Resistivity 1.45×10⁻⁶ Ω·m57.1 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.05 V
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) 700 MJ/kg300,946 BTU/lb · Embodied Carbon (primary production) 48 kg CO₂/kg · Embodied Water 900 L/kg108 gal/lb · Typical Recycled Content 20%
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 20-ST vs Ti Grade 20 STA-HS — frequently asked
Is Ti Grade 20 STA-HS stronger than Ti Grade 20-ST?
Yes. Ti Grade 20 STA-HS has a typical yield strength of 1,210 MPa (175 ksi) against 820 MPa (119 ksi) for Ti Grade 20-ST — about 48% more. Tensile strength is 1,290 MPa (187 ksi) vs 860 MPa (125 ksi).
Which condition does FabDigit quote by default, ST or STA-HS?
ST is the default Ti Grade 20 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 is easier to machine, Ti Grade 20-ST or Ti Grade 20 STA-HS?
Ti Grade 20-ST. Its machinability rates poor (22/100) against not recommended (14/100) for Ti Grade 20 STA-HS; for welding the order is Ti Grade 20-ST first (good, 55/100) then Ti Grade 20 STA-HS (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti Grade 20-ST and Ti Grade 20 STA-HS 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.