Aluminum AlSi7Mg vs EN AC-43400
Aluminum · grade comparison
Aluminum AlSi7Mg and EN AC-43400 are both aluminum grades. AlSi7Mg is the stronger of the two: yield strength 240 MPa (34.8 ksi) against 155 MPa (22.5 ksi) for EN AC-43400, about 55% more; tensile strength follows at 350 MPa (50.8 ksi) vs 260 MPa (37.7 ksi). AlSi7Mg is the more ductile: elongation 8% versus 2% for EN AC-43400, and AlSi7Mg is harder (105 HB vs 75 HB). EN AC-43400 runs hotter in service (150°C vs 120°C continuous). On the shop floor, AlSi7Mg welds better (very good vs fair) and EN AC-43400 sits in a lower cost tier (standard, $$) than AlSi7Mg (premium, $$$).
AlSi7MgChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
EN AC-43400Choose it when the part sees heat, or when cost is the deciding factor.
AlSi7Mg vs EN AC-43400: 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.
Elastic (Young's) Modulus
Shear Modulus
Bulk 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: Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 557°C1,035 °F
Thermal
How each material carries heat and how hot it can run.
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Thermal Conductivity 130 W/m·K75.1 BTU/hr·ft·°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) -0.83 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Polishability
Same in both: Brazeability / Solderability 30 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 1,200 L/kg144 gal/lb
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 aluminum grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | AlSi7Mg | EN AC-43400 |
|---|---|---|
| 3D printing | Yes | — |
| Default condition | As Printed | — |
| Relative cost | $$$ Premium | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
| Anodized (Aluminum AM) | Yes | — |
| Plated (Metal AM) | Yes | — |
They share 4 finishes: Electroless Nickel (EN), Epoxy Coating, Gold Plating, Silver Plating.
AlSi7Mg vs EN AC-43400 — frequently asked
Is AlSi7Mg stronger than EN AC-43400?
Yes. AlSi7Mg has a typical yield strength of 240 MPa (34.8 ksi) against 155 MPa (22.5 ksi) for EN AC-43400 — about 55% more. Tensile strength is 350 MPa (50.8 ksi) vs 260 MPa (37.7 ksi).
Which is cheaper, AlSi7Mg or EN AC-43400?
EN AC-43400 is the lower-cost material: it sits in the standard tier ($$) while AlSi7Mg is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, AlSi7Mg or EN AC-43400?
EN AC-43400, by a small margin. Both rate good for machinability — 65/100 against 58/100 for AlSi7Mg; for welding the order is AlSi7Mg first (very good, 70/100) then EN AC-43400 (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in AlSi7Mg and EN AC-43400 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.