Aluminum 296.0-T4 vs 296.0-T7
Aluminum · 296.0 temper comparison
296.0-T4 and 296.0-T7 are two conditions of the same aluminum grade, 296.0: T4 (solution heat treated and naturally aged) versus T7 (solution heat treated and overaged (stabilized)). The chemistry is identical, so every difference below comes from the condition. 296.0-T7 is the stronger of the two: yield strength 138 MPa (20 ksi) against 131 MPa (19 ksi) for 296.0-T4, about 5% more; tensile strength follows at 270 MPa (39.2 ksi) vs 255 MPa (37 ksi). In exchange, 296.0-T4 is the more ductile: elongation 8.5% versus 4.5% for 296.0-T7, and 296.0-T7 is harder (80 HB vs 75 HB). 296.0-T7 runs hotter in service (175°C vs 100°C continuous) and 296.0-T7 conducts heat better (147 W/m·K vs 130 W/m·K).
296.0-T4Choose it when the part is bent, formed or impact-loaded.
296.0-T7Choose it when strength drives the design, or when the part sees heat.
296.0-T4 vs 296.0-T7: 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
Charpy V-Notch Impact (RT)
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 · Compressive Strength 185 MPa26.8 ksi · Fatigue Strength (Endurance Limit) 76 MPa11 ksi · Fracture Toughness (K_IC) 20 MPa·√m18.2 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 2.8 g/cm³0.1 lb/in³ · Melting Point (Solidus) 521°C970 °F · Liquidus Temperature 627°C1,161 °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 963 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 22.5 µm/m·K12.5 µin/in·°F · Latent Heat of Fusion 389 J/g167 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 4.9×10⁻⁸ Ω·m1.93 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.7 V · Corrosion Resistance 35 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 190% · Weldability 25 / 100 · Formability (cold) 5 / 100 · Castability 70 / 100 · Brazeability / Solderability 20 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 195 MJ/kg83,835 BTU/lb · Embodied Carbon (primary production) 12 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 55%
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.
296.0-T4 vs 296.0-T7 — frequently asked
Is 296.0-T7 stronger than 296.0-T4?
Yes. 296.0-T7 has a typical yield strength of 138 MPa (20 ksi) against 131 MPa (19 ksi) for 296.0-T4 — about 5% more. Tensile strength is 270 MPa (39.2 ksi) vs 255 MPa (37 ksi).
Which condition does FabDigit quote by default, T4 or T7?
T6 is the default 296.0 condition in the FabDigit quote flow (neither T4 nor T7). 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 296.0-T4 over 296.0-T7?
Pick 296.0-T4 when the part is bent, formed or impact-loaded. Pick 296.0-T7 when strength drives the design, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 296.0-T4 and 296.0-T7 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.