Aluminum EN AC-21200-T6 vs EN AC-21200-T7
Aluminum · EN AC-21200 temper comparison
EN AC-21200-T6 and EN AC-21200-T7 are two conditions of the same aluminum grade, EN AC-21200: T6 (solution heat treated and artificially aged) versus T7 (solution heat treated and overaged (stabilized)). The chemistry is identical, so every difference below comes from the condition. EN AC-21200-T6 is the stronger of the two: yield strength 320 MPa (46.4 ksi) against 260 MPa (37.7 ksi) for EN AC-21200-T7, about 23% more; tensile strength follows at 390 MPa (56.6 ksi) vs 330 MPa (47.9 ksi). EN AC-21200-T6 is harder — 125 HB against 105 HB for EN AC-21200-T7 — which matters for wear surfaces and threads. EN AC-21200-T7 runs hotter in service (200°C vs 150°C continuous) and EN AC-21200-T7 conducts heat better (150 W/m·K vs 130 W/m·K).
EN AC-21200-T6Choose it when strength drives the design, or when surface hardness matters.
EN AC-21200-T7Choose it when the part sees heat.
EN AC-21200-T6 vs EN AC-21200-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)
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 72 GPa10.4 Msi · Shear Modulus 27 GPa3.9 Msi · Bulk Modulus 72 GPa10.4 Msi · Poisson's Ratio 0.33 · Elongation at Break 4% · Compressive Strength 220 MPa31.9 ksi
Physical
Density and transition temperatures.
Same in both: Density 2.81 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 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 22.5 µm/m·K12.5 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).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Same in both: Machinability 78 / 100 · Weldability 25 / 100 · Formability (cold) 15 / 100 · Castability 40 / 100 · Brazeability / Solderability 20 / 100 · Polishability 50 / 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 1,150 L/kg138 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.
EN AC-21200-T6 vs EN AC-21200-T7 — frequently asked
Is EN AC-21200-T6 stronger than EN AC-21200-T7?
Yes. EN AC-21200-T6 has a typical yield strength of 320 MPa (46.4 ksi) against 260 MPa (37.7 ksi) for EN AC-21200-T7 — about 23% more. Tensile strength is 390 MPa (56.6 ksi) vs 330 MPa (47.9 ksi).
Which condition does FabDigit quote by default, T6 or T7?
T4 is the default EN AC-21200 condition in the FabDigit quote flow (neither T6 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.
When should I choose EN AC-21200-T6 over EN AC-21200-T7?
Pick EN AC-21200-T6 when strength drives the design, or when surface hardness matters. Pick EN AC-21200-T7 when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in EN AC-21200-T6 and EN AC-21200-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.