Aluminum 5449-H24 vs 5449-O
Aluminum · 5449 temper comparison
5449-H24 and 5449-O are two conditions of the same aluminum grade, 5449: H24 (strain hardened and partially annealed, half hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. 5449-H24 is the stronger of the two: yield strength 200 MPa (29 ksi) against 95 MPa (13.8 ksi) for 5449-O, about 111% more; tensile strength follows at 265 MPa (38.4 ksi) vs 210 MPa (30.5 ksi). In exchange, 5449-O is the more ductile: elongation 24% versus 9% for 5449-H24, and 5449-H24 is harder (75 HB vs 55 HB). 5449-O runs hotter in service (150°C vs 120°C continuous). On the shop floor, 5449-H24 machines more easily (fair vs poor).
5449-H24Choose it when strength drives the design, or when the part is machined in volume.
5449-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
5449-H24 vs 5449-O: 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
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 70 GPa10.2 Msi · Shear Modulus 26.4 GPa3.8 Msi · Bulk Modulus 69 GPa10 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Same in both: Density 2.68 g/cm³0.1 lb/in³ · Melting Point (Solidus) 610°C1,130 °F · Liquidus Temperature 652°C1,206 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 137 W/m·K79.2 BTU/hr·ft·°F · Specific Heat Capacity 900 J/kg·K0.21 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23.7 µm/m·K13.2 µin/in·°F · Latent Heat of Fusion 395 J/g170 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: Electrical Resistivity 5.2×10⁻⁸ Ω·m2.05 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.85 V · Corrosion Resistance 74 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 30 / 100 · Brazeability / Solderability 25 / 100 · Polishability 60 / 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 kg CO₂/kg · Embodied Water 1,150 L/kg138 gal/lb · Typical Recycled Content 35%
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.
5449-H24 vs 5449-O — frequently asked
Is 5449-H24 stronger than 5449-O?
Yes. 5449-H24 has a typical yield strength of 200 MPa (29 ksi) against 95 MPa (13.8 ksi) for 5449-O — about 111% more. Tensile strength is 265 MPa (38.4 ksi) vs 210 MPa (30.5 ksi).
Which condition does FabDigit quote by default, H24 or O?
O is the default 5449 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, 5449-H24 or 5449-O?
5449-H24. Its machinability rates fair (44/100) against poor (32/100) for 5449-O; for welding the order is 5449-O first (excellent, 90/100) then 5449-H24 (excellent, 85/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 5449-H24 and 5449-O 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.