Magnesium Alloy EQ21A vs QE22A
Magnesium Alloy · grade comparison
Magnesium Alloy EQ21A and QE22A are both magnesium alloy grades. Both yield at about 195 MPa — strength does not separate them. EQ21A is the more ductile: elongation 4% versus 3% for QE22A. QE22A runs hotter in service (250°C vs 200°C continuous). On the shop floor, EQ21A welds better (very good vs good).
EQ21AChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
QE22AChoose it when the part sees heat.
EQ21A vs QE22A: 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.
Bulk Modulus
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 44 GPa6.4 Msi · Shear Modulus 17 GPa2.5 Msi · Poisson's Ratio 0.35 · Tensile Strength (Ultimate) 260 MPa37.7 ksi · Yield Strength (0.2% offset) 195 MPa28.3 ksi · Charpy V-Notch Impact (RT) 3 J2.2 ft·lbf · Hardness, Brinell 80 HB
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Same in both: Liquidus Temperature 640°C1,184 °F
Thermal
How each material carries heat and how hot it can run.
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Thermal Conductivity 113 W/m·K65.3 BTU/hr·ft·°F · Specific Heat Capacity 1,000 J/kg·K0.24 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 26.7 µm/m·K14.8 µin/in·°F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 25 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Formability (cold)
Castability
Same in both: Machinability 92 / 100 · Machinability Rating (AISI 1212 = 100 %) 400% · Brazeability / Solderability 20 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Same in both: Embodied Carbon (primary production) 32 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 15%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Same in both: Modulus of Resilience 432 kJ/m³ · Thermal Shock Resistance Index 25
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 | EQ21A | QE22A |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
EQ21A vs QE22A — frequently asked
What is the difference between EQ21A and QE22A?
Magnesium Alloy EQ21A and QE22A are both magnesium alloy grades. Both yield at about 195 MPa — strength does not separate them. EQ21A is the more ductile: elongation 4% versus 3% for QE22A.
Which is cheaper, EQ21A or QE22A?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, EQ21A or QE22A?
EQ21A. Its weldability rates very good (75/100) against good (65/100) for QE22A.
Ready to make it?
Upload a CAD file and FabDigit prices the part in EQ21A and QE22A 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.