Titanium IMI 550-ANN vs IMI 550 BETA-STA
Titanium · IMI 550 temper comparison
IMI 550-ANN and IMI 550 BETA-STA are two conditions of the same titanium grade, IMI 550: ANN (annealed) versus BETA-STA (beta processed + STA). The chemistry is identical, so every difference below comes from the condition. IMI 550 BETA-STA is the stronger of the two: yield strength 1,010 MPa (146 ksi) against 900 MPa (131 ksi) for IMI 550-ANN, about 12% more; tensile strength follows at 1,110 MPa (161 ksi) vs 1,000 MPa (145 ksi). In exchange, IMI 550-ANN is the more ductile: elongation 16% versus 8% for IMI 550 BETA-STA, and IMI 550 BETA-STA is harder (35 HRC vs 32 HRC). IMI 550 BETA-STA runs hotter in service (400°C vs 350°C continuous).
IMI 550-ANNChoose it when the part is bent, formed or impact-loaded.
IMI 550 BETA-STAChoose it when strength drives the design, or when the part sees heat.
IMI 550-ANN vs IMI 550 BETA-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.
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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 44 GPa6.4 Msi · Bulk Modulus 107 GPa15.5 Msi · Poisson's Ratio 0.32
Physical
Density and transition temperatures.
Same in both: Density 4.6 g/cm³0.17 lb/in³ · Melting Point (Solidus) 1,590°C2,894 °F · Liquidus Temperature 1,650°C3,002 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 7.1 W/m·K4.1 BTU/hr·ft·°F · Specific Heat Capacity 565 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 -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.1 % IACS · Electrical Resistivity 1.65×10⁻⁶ Ω·m65 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 25 / 100 · Castability 20 / 100 · Brazeability / Solderability 35 / 100 · Polishability 70 / 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 500 L/kg59.9 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.
IMI 550-ANN vs IMI 550 BETA-STA — frequently asked
Is IMI 550 BETA-STA stronger than IMI 550-ANN?
Yes. IMI 550 BETA-STA has a typical yield strength of 1,010 MPa (146 ksi) against 900 MPa (131 ksi) for IMI 550-ANN — about 12% more. Tensile strength is 1,110 MPa (161 ksi) vs 1,000 MPa (145 ksi).
Which condition does FabDigit quote by default, ANN or BETA-STA?
STA is the default IMI 550 condition in the FabDigit quote flow (neither ANN nor BETA-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, IMI 550-ANN or IMI 550 BETA-STA?
IMI 550-ANN, by a small margin. Both rate poor for machinability — 20/100 against 15/100 for IMI 550 BETA-STA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in IMI 550-ANN and IMI 550 BETA-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.