Aluminum 7175-T6 vs 7175-T73
Aluminum · 7175 temper comparison
7175-T6 and 7175-T73 are two conditions of the same aluminum grade, 7175: T6 (solution heat treated and artificially aged) versus T73 (solution heat treated and overaged for stress-corrosion resistance). The chemistry is identical, so every difference below comes from the condition. 7175-T6 is the stronger of the two: yield strength 525 MPa (76.1 ksi) against 455 MPa (66 ksi) for 7175-T73, about 15% more; tensile strength follows at 595 MPa (86.3 ksi) vs 525 MPa (76.1 ksi). 7175-T6 is harder — 150 HB against 140 HB for 7175-T73 — which matters for wear surfaces and threads. 7175-T73 runs hotter in service (150°C vs 120°C continuous) and 7175-T73 conducts heat better (155 W/m·K vs 130 W/m·K).
7175-T6Choose it when strength drives the design, or when surface hardness matters.
7175-T73Choose it when the part sees heat.
7175-T6 vs 7175-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 71.7 GPa10.4 Msi · Shear Modulus 26.9 GPa3.9 Msi · Bulk Modulus 70 GPa10.2 Msi · Poisson's Ratio 0.33 · Reduction in Area 25% · Compressive Strength 470 MPa68.2 ksi · Hardness, Vickers 148 HV
Physical
Density and transition temperatures.
Same in both: Density 2.8 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 960 J/kg·K0.23 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
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.8 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 %) 90% · Weldability 12 / 100 · Brazeability / Solderability 8 / 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.
7175-T6 vs 7175-T73 — frequently asked
Is 7175-T6 stronger than 7175-T73?
Yes. 7175-T6 has a typical yield strength of 525 MPa (76.1 ksi) against 455 MPa (66 ksi) for 7175-T73 — about 15% more. Tensile strength is 595 MPa (86.3 ksi) vs 525 MPa (76.1 ksi).
Which condition does FabDigit quote by default, T6 or T73?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
When should I choose 7175-T6 over 7175-T73?
Pick 7175-T6 when strength drives the design, or when surface hardness matters. Pick 7175-T73 when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7175-T6 and 7175-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.