Magnesium Alloy AZ31C-H24 vs AZ31C-O
Magnesium Alloy · AZ31C temper comparison
AZ31C-H24 and AZ31C-O are two conditions of the same magnesium alloy grade, AZ31C: H24 (strain hardened and partially annealed, half hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. AZ31C-H24 is the stronger of the two: yield strength 220 MPa (31.9 ksi) against 150 MPa (21.8 ksi) for AZ31C-O, about 47% more; tensile strength follows at 290 MPa (42.1 ksi) vs 255 MPa (37 ksi). In exchange, AZ31C-O is the more ductile: elongation 21% versus 15% for AZ31C-H24, and AZ31C-H24 is harder (73 HB vs 56 HB). AZ31C-O runs hotter in service (150°C vs 110°C continuous).
AZ31C-H24Choose it when strength drives the design.
AZ31C-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
AZ31C-H24 vs AZ31C-O: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all magnesium alloy 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 magnesium alloy 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 45 GPa6.5 Msi · Shear Modulus 17 GPa2.5 Msi · Bulk Modulus 45 GPa6.5 Msi · Poisson's Ratio 0.35
Physical
Density and transition temperatures.
Same in both: Density 1.77 g/cm³0.06 lb/in³ · Melting Point (Solidus) 566°C1,051 °F · Liquidus Temperature 632°C1,170 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 96 W/m·K55.5 BTU/hr·ft·°F · Specific Heat Capacity 1,000 J/kg·K0.24 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 26 µm/m·K14.4 µin/in·°F · Latent Heat of Fusion 373 J/g160 BTU/lb · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 18.5 % IACS · Electrical Resistivity 9.2×10⁻⁸ Ω·m3.62 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -1.55 V · Corrosion Resistance 13 / 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 40 / 100 · Brazeability / Solderability 30 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 355 MJ/kg152,623 BTU/lb · Embodied Carbon (primary production) 32 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every magnesium alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
AZ31C-H24 vs AZ31C-O — frequently asked
Is AZ31C-H24 stronger than AZ31C-O?
Yes. AZ31C-H24 has a typical yield strength of 220 MPa (31.9 ksi) against 150 MPa (21.8 ksi) for AZ31C-O — about 47% more. Tensile strength is 290 MPa (42.1 ksi) vs 255 MPa (37 ksi).
Which condition does FabDigit quote by default, H24 or O?
F is the default AZ31C condition in the FabDigit quote flow (neither H24 nor O). 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 welds better, AZ31C-H24 or AZ31C-O?
AZ31C-O. Its weldability rates very good (78/100) against very good (70/100) for AZ31C-H24.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AZ31C-H24 and AZ31C-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.