6061/SiC/10p T4 vs 6061/SiC/10p T651
Composite · 6061/SiC/10p grade comparison
6061/SiC/10p T4 and 6061/SiC/10p T651 are two grades of the same composite grade, 6061/SiC/10p: T4 (solution heat treated and naturally aged) versus T651 (T6, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. 6061/SiC/10p T651 is the stronger of the two: yield strength 305 MPa (44.2 ksi) against 150 MPa (21.8 ksi) for 6061/SiC/10p T4, about 103% more; tensile strength follows at 345 MPa (50 ksi) vs 245 MPa (35.5 ksi). In exchange, 6061/SiC/10p T4 is the more ductile: elongation 11% versus 5.5% for 6061/SiC/10p T651. 6061/SiC/10p T651 runs hotter in service (175°C vs 150°C continuous).
6061/SiC/10p T4Choose it when the part is bent, formed or impact-loaded.
6061/SiC/10p T651Choose it when strength drives the design, or when the part sees heat.
6061/SiC/10p T4 vs 6061/SiC/10p T651: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all composite 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 composite 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.
6061/SiC/10p T46061/SiC/10p T651
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Same in both: Elastic (Young's) Modulus 81 GPa11.7 Msi · Shear Modulus 31 GPa4.5 Msi · Bulk Modulus 79 GPa11.5 Msi · Poisson's Ratio 0.33 · Compressive Modulus 82 GPa11.9 Msi · Flexural Modulus 81 GPa11.7 Msi
Physical
Density and transition temperatures.
Same in both: Density 2.75 g/cm³0.1 lb/in³
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 880 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 20.7 µm/m·K11.5 µin/in·°F · Min Service Temperature -196°C-321 °F · Max Service Temperature (short-term) 250°C482 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 55 / 100 · UV / Weathering Resistance 95 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 225 MJ/kg96,733 BTU/lb · Embodied Carbon (primary production) 13.5 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 10%
Strength versus weight
Yield strength against density for every composite grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
6061/SiC/10p T4 vs 6061/SiC/10p T651 — frequently asked
Is 6061/SiC/10p T651 stronger than 6061/SiC/10p T4?
Yes. 6061/SiC/10p T651 has a typical yield strength of 305 MPa (44.2 ksi) against 150 MPa (21.8 ksi) for 6061/SiC/10p T4 — about 103% more. Tensile strength is 345 MPa (50 ksi) vs 245 MPa (35.5 ksi).
Which grade does FabDigit quote by default, T4 or T651?
T6 is the default 6061/SiC/10p condition in the FabDigit quote flow (neither T4 nor T651). 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 6061/SiC/10p T4 over 6061/SiC/10p T651?
Pick 6061/SiC/10p T4 when the part is bent, formed or impact-loaded. Pick 6061/SiC/10p T651 when strength drives the design, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 6061/SiC/10p T4 and 6061/SiC/10p T651 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.