Titanium BT20-M vs BT20-STA
Titanium · BT20 temper comparison
BT20-M and BT20-STA are two conditions of the same titanium grade, BT20: M (thermomechanically controlled processed) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. BT20-STA is the stronger of the two: yield strength 990 MPa (144 ksi) against 880 MPa (128 ksi) for BT20-M, about 13% more; tensile strength follows at 1,080 MPa (157 ksi) vs 990 MPa (144 ksi). In exchange, BT20-M is the more ductile: elongation 12% versus 8% for BT20-STA, and BT20-STA is harder (36 HRC vs 32 HRC).
BT20-MChoose it when the part is bent, formed or impact-loaded.
BT20-STAChoose it when strength drives the design.
BT20-M vs BT20-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
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 118 GPa17.1 Msi · Shear Modulus 44 GPa6.4 Msi · Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.33 · Compressive Strength 960 MPa139 ksi · Shear Strength 610 MPa88.5 ksi · Charpy V-Notch Impact (RT) 35 J25.8 ft·lbf · Hardness, Brinell 300 HB
Physical
Density and transition temperatures.
Same in both: Density 4.46 g/cm³0.16 lb/in³ · Melting Point (Solidus) 1,590°C2,894 °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 7.5 W/m·K4.3 BTU/hr·ft·°F · Specific Heat Capacity 540 J/kg·K0.13 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 -253°C-423 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.1 % IACS · Electrical Resistivity 1.6×10⁻⁶ Ω·m63 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V · Corrosion Resistance 85 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 18% · Weldability 72 / 100 · Formability (cold) 30 / 100 · Brazeability / Solderability 45 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 680 MJ/kg292,348 BTU/lb · Embodied Carbon (primary production) 45 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.
BT20-M vs BT20-STA — frequently asked
Is BT20-STA stronger than BT20-M?
Yes. BT20-STA has a typical yield strength of 990 MPa (144 ksi) against 880 MPa (128 ksi) for BT20-M — about 13% more. Tensile strength is 1,080 MPa (157 ksi) vs 990 MPa (144 ksi).
Which condition does FabDigit quote by default, M or STA?
M is the default BT20 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 BT20-M over BT20-STA?
Pick BT20-M when the part is bent, formed or impact-loaded. Pick BT20-STA when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in BT20-M and BT20-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.