Magnesium Alloy MB15-F vs MB15-T5
Magnesium Alloy · MB15 temper comparison
MB15-F and MB15-T5 are two conditions of the same magnesium alloy grade, MB15: F (as fabricated) versus T5 (cooled from hot working and artificially aged). The chemistry is identical, so every difference below comes from the condition. MB15-T5 is the stronger of the two: yield strength 275 MPa (39.9 ksi) against 230 MPa (33.4 ksi) for MB15-F, about 20% more; tensile strength follows at 340 MPa (49.3 ksi) vs 315 MPa (45.7 ksi). In exchange, MB15-F is the more ductile: elongation 13% versus 11% for MB15-T5, and MB15-T5 is harder (82 HB vs 70 HB). MB15-T5 runs hotter in service (150°C vs 120°C continuous).
MB15-FChoose it when the part is bent, formed or impact-loaded.
MB15-T5Choose it when strength drives the design, or when the part sees heat.
MB15-F vs MB15-T5: 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.
Elastic (Young's) Modulus
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: Shear Modulus 16.5 GPa2.4 Msi · Bulk Modulus 45 GPa6.5 Msi · Poisson's Ratio 0.35
Physical
Density and transition temperatures.
Same in both: Density 1.8 g/cm³0.07 lb/in³ · Melting Point (Solidus) 520°C968 °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 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 340 J/g146 BTU/lb · Min Service Temperature -70°C-94 °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) -1.57 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Formability (cold)
Same in both: Machinability 95 / 100 · Machinability Rating (AISI 1212 = 100 %) 480% · Castability 40 / 100 · Brazeability / Solderability 20 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 320 MJ/kg137,575 BTU/lb · Embodied Carbon (primary production) 32 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 15%
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.
MB15-F vs MB15-T5 — frequently asked
Is MB15-T5 stronger than MB15-F?
Yes. MB15-T5 has a typical yield strength of 275 MPa (39.9 ksi) against 230 MPa (33.4 ksi) for MB15-F — about 20% more. Tensile strength is 340 MPa (49.3 ksi) vs 315 MPa (45.7 ksi).
Which condition does FabDigit quote by default, F or T5?
T5 is the default MB15 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 welds better, MB15-F or MB15-T5?
MB15-F. Its weldability rates poor (30/100) against poor (25/100) for MB15-T5.
Ready to make it?
Upload a CAD file and FabDigit prices the part in MB15-F and MB15-T5 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.