Aluminum 7022-O vs 7022-T651
Aluminum · 7022 temper comparison
7022-O and 7022-T651 are two conditions of the same aluminum grade, 7022: O (annealed) versus T651 (T6, stress relieved by stretching). The chemistry is identical, so every difference below comes from the condition. 7022-T651 is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 120 MPa (17.4 ksi) for 7022-O, about 3.9 times as much; tensile strength follows at 530 MPa (76.9 ksi) vs 240 MPa (34.8 ksi). In exchange, 7022-O is the more ductile: elongation 15% versus 8% for 7022-T651, and 7022-T651 is harder (150 HB vs 68 HB). 7022-O runs hotter in service (150°C vs 120°C continuous) and 7022-O conducts heat better (170 W/m·K vs 145 W/m·K). On the shop floor, 7022-T651 machines more easily (very good vs fair).
7022-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
7022-T651Choose it when strength drives the design, or when the part is machined in volume.
7022-O vs 7022-T651: 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
Shear Strength
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 70 GPa10.2 Msi · Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 71 GPa10.3 Msi · Poisson's Ratio 0.33 · Reduction in Area 18% · Compressive Strength 480 MPa69.6 ksi · Fatigue Strength (Endurance Limit) 150 MPa21.8 ksi · Fracture Toughness (K_IC) 28 MPa·√m25.5 ksi·√in · Hardness, Rockwell B 85 HRB · Hardness, Vickers 160 HV
Physical
Density and transition temperatures.
Same in both: Density 2.78 g/cm³0.1 lb/in³ · Melting Point (Solidus) 475°C887 °F · Liquidus Temperature 635°C1,175 °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 865 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.5 µm/m·K13.1 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
Same in both: Electrical Resistivity 5.4×10⁻⁸ Ω·m2.13 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.84 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 %) 300% · Weldability 20 / 100 · Castability 35 / 100 · Brazeability / Solderability 15 / 100 · Polishability 72 / 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 1,100 L/kg132 gal/lb · Typical Recycled Content 20%
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.
7022-O vs 7022-T651 — frequently asked
Is 7022-T651 stronger than 7022-O?
Yes. 7022-T651 has a typical yield strength of 470 MPa (68.2 ksi) against 120 MPa (17.4 ksi) for 7022-O — about 3.9 times as much. Tensile strength is 530 MPa (76.9 ksi) vs 240 MPa (34.8 ksi).
Which condition does FabDigit quote by default, O or T651?
T651 is the default 7022 condition in the FabDigit quote flow. 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, 7022-O or 7022-T651?
7022-T651. Its machinability rates very good (75/100) against fair (45/100) for 7022-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 7022-O and 7022-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.