Aluminum 7A52-T4 vs 7A52-T73
Aluminum · 7A52 temper comparison
7A52-T4 and 7A52-T73 are two conditions of the same aluminum grade, 7A52: T4 (solution heat treated and naturally aged) versus T73 (solution heat treated and overaged for stress-corrosion resistance). The chemistry is identical, so every difference below comes from the condition. 7A52-T73 is the stronger of the two: yield strength 330 MPa (47.9 ksi) against 240 MPa (34.8 ksi) for 7A52-T4, about 38% more; tensile strength follows at 405 MPa (58.7 ksi) vs 380 MPa (55.1 ksi). In exchange, 7A52-T4 is the more ductile: elongation 17% versus 14% for 7A52-T73, and 7A52-T73 is harder (118 HB vs 105 HB). 7A52-T73 conducts heat better (158 W/m·K vs 128 W/m·K).
7A52-T4Choose it when the part is bent, formed or impact-loaded.
7A52-T73Choose it when strength drives the design.
7A52-T4 vs 7A52-T73: 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 27 GPa3.9 Msi · Bulk Modulus 72 GPa10.4 Msi · Poisson's Ratio 0.33 · Compressive Strength 400 MPa58 ksi · Hardness, Vickers 145 HV
Physical
Density and transition temperatures.
Same in both: Density 2.78 g/cm³0.1 lb/in³ · Melting Point (Solidus) 585°C1,085 °F · Liquidus Temperature 640°C1,184 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 960 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.5 µm/m·K13.1 µin/in·°F · Latent Heat of Fusion 390 J/g168 BTU/lb · Max Service Temperature (continuous) 120°C248 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 4.3×10⁻⁸ Ω·m1.69 µΩ·in
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
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 70% · Weldability 75 / 100 · Brazeability / Solderability 20 / 100 · Polishability 60 / 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 20%
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.
7A52-T4 vs 7A52-T73 — frequently asked
Is 7A52-T73 stronger than 7A52-T4?
Yes. 7A52-T73 has a typical yield strength of 330 MPa (47.9 ksi) against 240 MPa (34.8 ksi) for 7A52-T4 — about 38% more. Tensile strength is 405 MPa (58.7 ksi) vs 380 MPa (55.1 ksi).
Which condition does FabDigit quote by default, T4 or T73?
T6 is the default 7A52 condition in the FabDigit quote flow (neither T4 nor T73). 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, 7A52-T4 or 7A52-T73?
7A52-T73, by a small margin. Both rate good for machinability — 60/100 against 55/100 for 7A52-T4.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7A52-T4 and 7A52-T73 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.