Aluminum 7085-T7351 vs 7085-T7451
Aluminum · 7085 temper comparison
7085-T7351 and 7085-T7451 are two conditions of the same aluminum grade, 7085: T7351 (T73, stress relieved by stretching) versus T7451 (T74, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. 7085-T7451 is the stronger of the two: yield strength 469 MPa (68 ksi) against 428 MPa (62.1 ksi) for 7085-T7351, about 10% more. 7085-T7451 is harder — 150 HB against 138 HB for 7085-T7351 — which matters for wear surfaces and threads.
7085-T7451Choose it when strength drives the design, or when surface hardness matters.
7085-T7351 vs 7085-T7451: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 70.5 GPa10.2 Msi · Shear Modulus 26.9 GPa3.9 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33 · Reduction in Area 22%
Physical
Density and transition temperatures.
Same in both: Density 2.85 g/cm³0.1 lb/in³ · Melting Point (Solidus) 477°C891 °F · Liquidus Temperature 635°C1,175 °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 860 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 390 J/g168 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 4.2×10⁻⁸ Ω·m1.65 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.84 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 70% · Weldability 20 / 100 · Formability (cold) 25 / 100 · Castability 35 / 100 · Brazeability / Solderability 10 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 205 MJ/kg88,134 BTU/lb · Embodied Carbon (primary production) 12.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 8%
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.
7085-T7351 vs 7085-T7451 — frequently asked
Is 7085-T7451 stronger than 7085-T7351?
Yes. 7085-T7451 has a typical yield strength of 469 MPa (68 ksi) against 428 MPa (62.1 ksi) for 7085-T7351 — about 10% more. Tensile strength is 505 MPa (73.2 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, T7351 or T7451?
T7451 is the default 7085 condition in the FabDigit quote flow. 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 7085-T7351 over 7085-T7451?
Pick 7085-T7451 when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7085-T7351 and 7085-T7451 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.