Magnesium Alloy EV31A vs ZM6
Magnesium Alloy · grade comparison
Magnesium Alloy EV31A and ZM6 are both magnesium alloy grades. ZM6 is the stronger of the two: yield strength 145 MPa (21 ksi) against 110 MPa (16 ksi) for EV31A, about 32% more; tensile strength follows at 250 MPa (36.3 ksi) vs 195 MPa (28.3 ksi). ZM6 is the more ductile: elongation 4.5% versus 4% for EV31A, and ZM6 is harder (70 HB vs 55 HB). ZM6 runs hotter in service (250°C vs 150°C continuous) and ZM6 conducts electricity better (25 % IACS vs 9.5 % IACS). On the shop floor, EV31A sits in a lower cost tier (standard, $$) than ZM6 (high, $$$$).
EV31AChoose it when cost is the deciding factor.
ZM6Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
EV31A vs ZM6: 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.
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Brinell
Hardness, Vickers
Reduction in Area
Same in both: Elastic (Young's) Modulus 44 GPa6.4 Msi · Charpy V-Notch Impact (RT) 3 J2.2 ft·lbf
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 545°C1,013 °F · Liquidus Temperature 640°C1,184 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Specific Heat Capacity 1,000 J/kg·K0.24 BTU/lb·°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) -1.55 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Brazeability / Solderability
Same in both: Castability 85 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 15%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
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.
Manufacturing and finishing
| Capability | EV31A | ZM6 |
|---|---|---|
| CNC machining | Yes | — |
| Default condition | As Cast | — |
| Relative cost | $$ Standard | $$$$ High |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 0.8 µm | — |
| Anodizing Type II | Yes | — |
| Chem Film (Alodine) | Yes | — |
| E-Coating | Yes | — |
| Hard Anodize Type III w/ PTFE | Yes | — |
| Hard Anodizing Type III | Yes | — |
| Painting | Yes | — |
| Powder Coating | Yes | — |
EV31A vs ZM6 — frequently asked
Is ZM6 stronger than EV31A?
Yes. ZM6 has a typical yield strength of 145 MPa (21 ksi) against 110 MPa (16 ksi) for EV31A — about 32% more. Tensile strength is 250 MPa (36.3 ksi) vs 195 MPa (28.3 ksi).
Which is cheaper, EV31A or ZM6?
EV31A is the lower-cost material: it sits in the standard tier ($$) while ZM6 is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which welds better, EV31A or ZM6?
EV31A. Its weldability rates very good (72/100) against good (65/100) for ZM6.
Ready to make it?
Upload a CAD file and FabDigit prices the part in EV31A and ZM6 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.