Aluminum C355.0-T61 vs C355.0-T7
Aluminum · C355.0 temper comparison
C355.0-T61 and C355.0-T7 are two conditions of the same aluminum grade, C355.0: T61 (T6 variant, underaged) versus T7 (solution heat treated and overaged (stabilized)). The chemistry is identical, so every difference below comes from the condition. C355.0-T61 is the stronger of the two: yield strength 240 MPa (34.8 ksi) against 200 MPa (29 ksi) for C355.0-T7, about 20% more; tensile strength follows at 290 MPa (42.1 ksi) vs 255 MPa (37 ksi). In exchange, C355.0-T7 is the more ductile: elongation 4.5% versus 3% for C355.0-T61, and C355.0-T61 is harder (90 HB vs 80 HB). C355.0-T7 runs hotter in service (175°C vs 150°C continuous).
C355.0-T61Choose it when strength drives the design.
C355.0-T7Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C355.0-T61 vs C355.0-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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 71 GPa10.3 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.71 g/cm³0.1 lb/in³ · Melting Point (Solidus) 546°C1,015 °F · Liquidus Temperature 621°C1,150 °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) 22.4 µm/m·K12.4 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
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.78 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 55 / 100 · Castability 88 / 100 · Brazeability / Solderability 25 / 100 · Polishability 55 / 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 25%
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.
C355.0-T61 vs C355.0-T7 — frequently asked
Is C355.0-T61 stronger than C355.0-T7?
Yes. C355.0-T61 has a typical yield strength of 240 MPa (34.8 ksi) against 200 MPa (29 ksi) for C355.0-T7 — about 20% more. Tensile strength is 290 MPa (42.1 ksi) vs 255 MPa (37 ksi).
Which condition does FabDigit quote by default, T61 or T7?
T6 is the default C355.0 condition in the FabDigit quote flow (neither T61 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.
Which is easier to machine, C355.0-T61 or C355.0-T7?
C355.0-T61, by a small margin. Both rate good for machinability — 65/100 against 60/100 for C355.0-T7.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C355.0-T61 and C355.0-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.