Aluminum 7085-T7451 vs 7085-T7651
Aluminum · 7085 temper comparison
7085-T7451 and 7085-T7651 are two conditions of the same aluminum grade, 7085: T7451 (T74, stress relieved by stretching) versus T7651 (T76, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. 7085-T7651 is the stronger of the two: yield strength 496 MPa (71.9 ksi) against 469 MPa (68 ksi) for 7085-T7451, about 6% more. In exchange, 7085-T7451 is the more ductile: elongation 11% versus 9% for 7085-T7651, and 7085-T7651 is harder (158 HB vs 150 HB).
7085-T7451Choose it when the part is bent, formed or impact-loaded.
7085-T7651Choose it when strength drives the design.
7085-T7451 vs 7085-T7651: 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
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 · 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 4.2×10⁻⁸ 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-T7451 vs 7085-T7651 — frequently asked
Is 7085-T7651 stronger than 7085-T7451?
Yes. 7085-T7651 has a typical yield strength of 496 MPa (71.9 ksi) against 469 MPa (68 ksi) for 7085-T7451 — about 6% more. Tensile strength is 531 MPa (77 ksi) vs 505 MPa (73.2 ksi).
Which condition does FabDigit quote by default, T7451 or T7651?
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-T7451 over 7085-T7651?
Pick 7085-T7451 when the part is bent, formed or impact-loaded. Pick 7085-T7651 when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7085-T7451 and 7085-T7651 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.