Aluminum 6025-O vs 6025-T6
Aluminum · 6025 temper comparison
6025-O and 6025-T6 are two conditions of the same aluminum grade, 6025: O (annealed) versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. 6025-T6 is the stronger of the two: yield strength 290 MPa (42.1 ksi) against 100 MPa (14.5 ksi) for 6025-O, about 190% more; tensile strength follows at 330 MPa (47.9 ksi) vs 220 MPa (31.9 ksi). In exchange, 6025-O is the more ductile: elongation 24% versus 10% for 6025-T6, and 6025-T6 is harder (97 HB vs 55 HB). 6025-T6 conducts electricity better (40 % IACS vs 35 % IACS). On the shop floor, 6025-T6 machines more easily (good vs fair) and 6025-O welds better (80 vs 70 out of 100).
6025-OChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
6025-T6Choose it when strength drives the design, or when the part is machined in volume.
6025-O vs 6025-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)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 70 GPa10.2 Msi · Shear Modulus 26 GPa3.8 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.69 g/cm³0.1 lb/in³ · Melting Point (Solidus) 590°C1,094 °F · Liquidus Temperature 650°C1,202 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.4 µm/m·K13 µin/in·°F · Latent Heat of Fusion 395 J/g170 BTU/lb · Max Service Temperature (continuous) 150°C302 °F · 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) -0.85 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: Brazeability / Solderability 25 / 100 · Polishability 55 / 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 35%
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.
6025-O vs 6025-T6 — frequently asked
Is 6025-T6 stronger than 6025-O?
Yes. 6025-T6 has a typical yield strength of 290 MPa (42.1 ksi) against 100 MPa (14.5 ksi) for 6025-O — about 190% more. Tensile strength is 330 MPa (47.9 ksi) vs 220 MPa (31.9 ksi).
Which condition does FabDigit quote by default, O or T6?
H32 is the default 6025 condition in the FabDigit quote flow (neither O 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, 6025-O or 6025-T6?
6025-T6. Its machinability rates good (60/100) against fair (35/100) for 6025-O; for welding the order is 6025-O first (very good, 80/100) then 6025-T6 (very good, 70/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6025-O and 6025-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.