What is the best aluminum alloy for die casting?
2026-05-07
The “best” aluminum alloy for die casting depends on application, but ADC12 is the most widely used and cost-effective for general die casting, while A380 is optimal for high-strength, pressure-bearing parts. Key options and their use cases:
ADC12 (AlSi11Cu3): The industry standard for mass die casting. It has excellent fluidity, good machinability, and a tensile strength of ~200 MPa. Ideal for non-load-bearing parts like electronic housings, brackets, and automotive interior components — accounts for 60% of aluminum die casting orders globally.
A380 (AlSi8Cu3): Best for high-strength, pressure-tight parts (tensile strength ~240 MPa). It resists porosity and shrinkage, making it suitable for hydraulic components, engine parts, and pump bodies that require leak resistance.
A356 (AlSi7Mg): Ideal for heat-treatable, high-performance die cast parts. After T6 heat treatment, its tensile strength reaches 280–320 MPa, making it perfect for wheels, structural components, and aerospace parts (requires precision die casting).
For most B2B mass production (e.g., automotive, electronics), ADC12 is the best balance of cost, castability, and performance.
ADC12 (AlSi11Cu3): The industry standard for mass die casting. It has excellent fluidity, good machinability, and a tensile strength of ~200 MPa. Ideal for non-load-bearing parts like electronic housings, brackets, and automotive interior components — accounts for 60% of aluminum die casting orders globally.
A380 (AlSi8Cu3): Best for high-strength, pressure-tight parts (tensile strength ~240 MPa). It resists porosity and shrinkage, making it suitable for hydraulic components, engine parts, and pump bodies that require leak resistance.
A356 (AlSi7Mg): Ideal for heat-treatable, high-performance die cast parts. After T6 heat treatment, its tensile strength reaches 280–320 MPa, making it perfect for wheels, structural components, and aerospace parts (requires precision die casting).
For most B2B mass production (e.g., automotive, electronics), ADC12 is the best balance of cost, castability, and performance.
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