Aluminum AlSi7Mg vs EN AC-42200
Aluminum · grade comparison
Aluminum AlSi7Mg and EN AC-42200 are both aluminum grades. AlSi7Mg is the stronger of the two: tensile strength 350 MPa (50.8 ksi) against 320 MPa (46.4 ksi) for EN AC-42200, about 9% more. AlSi7Mg is the more ductile: elongation 8% versus 4% for EN AC-42200. EN AC-42200 runs hotter in service (150°C vs 120°C continuous) and EN AC-42200 conducts heat better (151 W/m·K vs 130 W/m·K). On the shop floor, EN AC-42200 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-42200Choose it when the part sees heat, or when cost is the deciding factor.
AlSi7Mg vs EN AC-42200: 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)
Hardness, Vickers
Same in both: Poisson's Ratio 0.33 · Charpy V-Notch Impact (RT) 6 J4.4 ft·lbf · Hardness, Brinell 105 HB
Physical
Density and transition temperatures.
Same in both: Density 2.67 g/cm³0.1 lb/in³ · Melting Point (Solidus) 557°C1,035 °F · Liquidus Temperature 613°C1,135 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 963 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 21.5 µm/m·K11.9 µin/in·°F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.83 V · Corrosion Resistance 58 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Polishability
Same in both: Weldability 70 / 100 · Castability 90 / 100 · Brazeability / Solderability 30 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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-42200 |
|---|---|---|
| 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-42200 — frequently asked
Is AlSi7Mg stronger than EN AC-42200?
Yes. AlSi7Mg has a typical tensile strength of 350 MPa (50.8 ksi) against 320 MPa (46.4 ksi) for EN AC-42200 — about 9% more.
Which is cheaper, AlSi7Mg or EN AC-42200?
EN AC-42200 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.
When should I choose AlSi7Mg over EN AC-42200?
Pick AlSi7Mg when strength drives the design, or when the part is bent, formed or impact-loaded. Pick EN AC-42200 when the part sees heat, or when cost is the deciding factor.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AlSi7Mg and EN AC-42200 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.