Aluminum AlSi7Mg Stress Relieved vs AlSi7Mg-T6
Aluminum · AlSi7Mg temper comparison
AlSi7Mg Stress Relieved and AlSi7Mg-T6 are two conditions of the same aluminum grade, AlSi7Mg: Stress Relieved versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. AlSi7Mg-T6 is the stronger of the two: yield strength 300 MPa (43.5 ksi) against 200 MPa (29 ksi) for AlSi7Mg Stress Relieved, about 50% more; tensile strength follows at 380 MPa (55.1 ksi) vs 300 MPa (43.5 ksi). In exchange, AlSi7Mg Stress Relieved is the more ductile: elongation 12% versus 8% for AlSi7Mg-T6, and AlSi7Mg-T6 is harder (115 HB vs 90 HB).
AlSi7Mg Stress RelievedChoose it when the part is bent, formed or impact-loaded.
AlSi7Mg-T6Choose it when strength drives the design.
AlSi7Mg Stress Relieved vs AlSi7Mg-T6: 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.
AlSi7Mg Stress RelievedAlSi7Mg-T6
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
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 71 GPa10.3 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 69 GPa10 Msi · Poisson's Ratio 0.33 · Compressive Strength 250 MPa36.3 ksi · Charpy V-Notch Impact (RT) 6 J4.4 ft·lbf
Physical
Density and transition temperatures.
Same in both: Density 2.67 g/cm³0.1 lb/in³ · Melting Point (Solidus) 557°C1,035 °F · Liquidus Temperature 613°C1,135 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 963 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 21.5 µm/m·K11.9 µin/in·°F · Latent Heat of Fusion 389 J/g167 BTU/lb · Max Service Temperature (continuous) 150°C302 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.83 V · Corrosion Resistance 58 / 100
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 70 / 100 · Formability (cold) 20 / 100 · Castability 90 / 100 · Brazeability / Solderability 30 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 215 MJ/kg92,433 BTU/lb · Embodied Carbon (primary production) 13 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 10%
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.
AlSi7Mg Stress Relieved vs AlSi7Mg-T6 — frequently asked
Is AlSi7Mg-T6 stronger than AlSi7Mg Stress Relieved?
Yes. AlSi7Mg-T6 has a typical yield strength of 300 MPa (43.5 ksi) against 200 MPa (29 ksi) for AlSi7Mg Stress Relieved — about 50% more. Tensile strength is 380 MPa (55.1 ksi) vs 300 MPa (43.5 ksi).
Which condition does FabDigit quote by default, Stress Relieved or T6?
As Printed is the default AlSi7Mg condition in the FabDigit quote flow (neither Stress Relieved nor T6). 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, AlSi7Mg Stress Relieved or AlSi7Mg-T6?
AlSi7Mg-T6, by a small margin. Both rate good for machinability — 65/100 against 60/100 for AlSi7Mg Stress Relieved.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AlSi7Mg Stress Relieved and AlSi7Mg-T6 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.