Aluminum 771.0-T2 vs 771.0-T6
Aluminum · 771.0 temper comparison
771.0-T2 and 771.0-T6 are two conditions of the same aluminum grade, 771.0: T2 (cooled from hot working, cold worked and naturally aged) versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. 771.0-T6 is the stronger of the two: yield strength 241 MPa (35 ksi) against 150 MPa (21.8 ksi) for 771.0-T2, about 61% more; tensile strength follows at 290 MPa (42.1 ksi) vs 220 MPa (31.9 ksi). 771.0-T6 is the more ductile: elongation 5% versus 2% for 771.0-T2, and 771.0-T6 is harder (75 HB vs 70 HB). 771.0-T2 runs hotter in service (150°C vs 120°C continuous) and 771.0-T2 conducts electricity better (38 % IACS vs 32 % IACS). On the shop floor, 771.0-T6 machines more easily (80 vs 70 out of 100).
771.0-T2Choose it when the part sees heat.
771.0-T6Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
771.0-T2 vs 771.0-T6: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all aluminum 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 aluminum 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.81 g/cm³0.1 lb/in³ · Melting Point (Solidus) 604°C1,119 °F · Liquidus Temperature 643°C1,189 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 960 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 24 µm/m·K13.3 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.87 V
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 45 / 100 · Castability 45 / 100 · Brazeability / Solderability 20 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 200 MJ/kg85,985 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 25%
Strength versus weight
Yield strength against density for every aluminum grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
771.0-T2 vs 771.0-T6 — frequently asked
Is 771.0-T6 stronger than 771.0-T2?
Yes. 771.0-T6 has a typical yield strength of 241 MPa (35 ksi) against 150 MPa (21.8 ksi) for 771.0-T2 — about 61% more. Tensile strength is 290 MPa (42.1 ksi) vs 220 MPa (31.9 ksi).
Which condition does FabDigit quote by default, T2 or T6?
T71 is the default 771.0 condition in the FabDigit quote flow (neither T2 nor T6). 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, 771.0-T2 or 771.0-T6?
771.0-T6, by a small margin. Both rate very good for machinability — 80/100 against 70/100 for 771.0-T2.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 771.0-T2 and 771.0-T6 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.