Aluminum A20X Stress Relieved vs A20X-T6
Aluminum · A20X temper comparison
A20X Stress Relieved and A20X-T6 are two conditions of the same aluminum grade, A20X: Stress Relieved versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. A20X-T6 is the stronger of the two: yield strength 425 MPa (61.6 ksi) against 220 MPa (31.9 ksi) for A20X Stress Relieved, about 93% more; tensile strength follows at 495 MPa (71.8 ksi) vs 350 MPa (50.8 ksi). In exchange, A20X Stress Relieved is the more ductile: elongation 14% versus 9% for A20X-T6, and A20X-T6 is harder (140 HB vs 90 HB). A20X-T6 runs hotter in service (180°C vs 150°C continuous).
A20X Stress RelievedChoose it when the part is bent, formed or impact-loaded.
A20X-T6Choose it when strength drives the design, or when the part sees heat.
A20X Stress Relieved vs A20X-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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 77 GPa11.2 Msi · Shear Modulus 29 GPa4.2 Msi · Bulk Modulus 73 GPa10.6 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.83 g/cm³0.1 lb/in³ · Melting Point (Solidus) 545°C1,013 °F · Liquidus Temperature 645°C1,193 °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 870 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 22.3 µm/m·K12.4 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) -0.65 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 %) 200% · Weldability 50 / 100 · Castability 75 / 100 · Brazeability / Solderability 25 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 240 MJ/kg103,182 BTU/lb · Embodied Carbon (primary production) 15 kg CO₂/kg · Embodied Water 1,200 L/kg144 gal/lb · Typical Recycled Content 5%
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.
A20X Stress Relieved vs A20X-T6 — frequently asked
Is A20X-T6 stronger than A20X Stress Relieved?
Yes. A20X-T6 has a typical yield strength of 425 MPa (61.6 ksi) against 220 MPa (31.9 ksi) for A20X Stress Relieved — about 93% more. Tensile strength is 495 MPa (71.8 ksi) vs 350 MPa (50.8 ksi).
Which condition does FabDigit quote by default, Stress Relieved or T6?
As Printed is the default A20X 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.
When should I choose A20X Stress Relieved over A20X-T6?
Pick A20X Stress Relieved when the part is bent, formed or impact-loaded. Pick A20X-T6 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 A20X Stress Relieved and A20X-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.