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Which Alloy is Best for Aluminum Die Casting?

2026-05-22 15:30


Aluminum die casting relies heavily on alloy selection to determine product performance, production efficiency, and manufacturing cost. There is no one-size-fits-all best aluminum alloy for all die-casting scenarios, as different alloys feature unique fluidity, mechanical strength, corrosion resistance and machining properties. The optimal alloy depends on product application, structural complexity, service environment and budget requirements. This article systematically analyzes mainstream die-casting aluminum alloys, summarizes their advantages, limitations and applicable scenarios, and guides manufacturers and purchasers to select the most suitable alloy for high-pressure die casting projects.

1. Core Selection Criteria for Die Casting Aluminum Alloys

To find the best aluminum alloy for die casting, manufacturers must follow professional industry selection standards, focusing on six core indicators that directly affect die casting production quality. First, castability is the primary criterion, including molten metal fluidity, shrinkage rate, and filling performance for complex thin-walled structures. Alloys with excellent castability can fully fill tiny mold cavities, reduce defective products such as cold shuts and porosity, and improve mass production stability.
Second, mechanical properties including tensile strength, hardness and ductility determine the service life of die-cast parts. Automotive and mechanical structural parts require high strength and wear resistance, while electronic shell parts prioritize toughness and anti-deformation ability. Third, corrosion resistance is crucial for products used in humid, outdoor or marine environments to avoid oxidation and aging failure.

Fourth, machining performance affects post-processing efficiency. Alloys with moderate hardness are easy for CNC drilling, tapping and polishing, effectively reducing tool loss. Fifth, thermal conductivity and electrical conductivity are key indicators for heat dissipation parts and electrical components. Finally, cost controllability ensures the alloy matches mass production budgets, balancing performance and economic benefits. Only by comprehensively evaluating these indicators can we select the most suitable die-casting aluminum alloy.

2. A380 Alloy: The Most Versatile General-Purpose Alloy

A380 is recognized as the most widely used universal alloy in the global aluminum die casting industry and is regarded as the best balanced alloy for conventional die-casting projects. It features a reasonable silicon-copper ratio, with excellent comprehensive castability and mechanical properties, perfectly adapting to most high-pressure die-casting production scenarios. Its outstanding molten fluidity enables it to fill complex thin-walled structures precisely, ensuring high dimensional accuracy of castings and low defect rate.
In terms of performance, A380 alloy has stable tensile strength, good rigidity and anti-deformation ability, and moderate wear resistance, meeting the daily service requirements of most industrial parts. It is compatible with multiple surface treatment processes including powder coating, electrophoresis and sandblasting, with excellent surface molding effect. In terms of cost, A380 has mature supply chains and low production costs, achieving an optimal balance of performance and economy.

The only limitation of A380 is its average corrosion resistance, so it is not suitable for long-term use in strong corrosive environments. Its mainstream application scenarios include electronic equipment shells, motor housings, household appliance accessories, and ordinary automotive structural parts. For most conventional die-casting orders with no extreme performance requirements, A380 is the most reliable and cost-effective choice.


3. ADC12 Alloy: Preferred Choice for Asian Standard Mass Production

ADC12 is a Japanese-standard die-casting aluminum alloy, highly similar to A380 in performance, and is the mainstream preferred material for mass precision die casting in Asian manufacturing markets. This alloy has ultra-high fluidity and low shrinkage, which can effectively avoid casting defects such as shrinkage cavities and pores during high-speed filling. It has extremely high molding stability for small, intricate and complex die-cast parts, suitable for high-volume automated production lines.
ADC12 alloy has high hardness and good compression resistance, with stable mechanical properties after long-term use, not easy to deform or damage. Its machining performance is excellent, which can greatly improve the efficiency of secondary CNC processing and reduce post-processing costs. Compared with A380, ADC12 has higher silicon content, better heat resistance and molding performance, but slightly lower ductility, making it more suitable for rigid parts that do not require bending and impact resistance.

In industrial applications, ADC12 is widely used in automotive engine accessories, hydraulic parts, communication equipment shells and hardware accessories. For large-batch, high-precision conventional die-casting projects, ADC12 is one of the best choices, with stable quality, fast production speed and high market applicability.


4. A360 Alloy: Optimal Alloy for Corrosion-Resistant Scenarios

For die-casting products with strict corrosion resistance requirements, A360 alloy is the best option. Different from A380 and ADC12, A360 contains a specific proportion of magnesium elements, which greatly enhances its oxidation resistance and environmental adaptability. It can maintain stable performance in humid, salty spray and outdoor open environments, effectively extending the service life of die-cast parts.
A360 alloy retains good castability and fluidity, meeting the molding requirements of complex structures. Meanwhile, it has better ductility and toughness than high-silicon alloys, with strong anti-impact and anti-cracking ability. Its thermal conductivity is excellent, making it suitable for heat dissipation components that require long-term stable operation. The disadvantage of A360 is its relatively higher cost and slightly lower hardness than ADC12, so it is not applicable for high-wear and high-load parts.
Typical application scenarios of A360 alloy include marine equipment parts, outdoor lighting shells, bathroom hardware, and electronic components used in humid environments. When corrosion resistance and environmental durability are the core demands, A360 is far superior to conventional alloys and becomes the most professional targeted choice.
5. A413 & A390: Professional Alloys for Special Performance Needs

For special industrial scenarios requiring ultra-high precision or ultra-high wear resistance, A413 and A390 are the best professional die-casting aluminum alloys. A413 is a eutectic high-silicon alloy with ultra-fine and dense microstructure after solidification. It has excellent air tightness and no loose pores inside the casting, making it the preferred material for hydraulic parts, pressure vessels and sealed pipeline components that require zero leakage.

A390 is a high-hardness, high-wear-resistant die-casting alloy with ultra-high silicon content, featuring outstanding hardness and compression resistance. It can withstand long-term friction and high-load operation, and is widely used in automotive engine blocks, mechanical pump bodies and industrial wear-resistant accessories. However, A390 has poor ductility, is prone to brittleness, and has high machining difficulty, so it is only used for professional high-wear parts, not suitable for conventional mass production.
These two special alloys have prominent single performance advantages but higher costs and stricter production process requirements. They are targeted high-end choices for segmented scenarios, filling the performance gap of conventional alloys in special working environments.
6. How to Choose the Best Alloy for Custom Die Casting Projects
There is no absolute best aluminum alloy in the die-casting industry, only the most matching one for project requirements. For most conventional mass-produced parts such as home appliances, ordinary electronic shells and general hardware, A380 is the first choice with balanced performance and low cost. For Asian-standard high-precision mass production projects, ADC12 ensures stable molding and high processing efficiency.
For outdoor, marine and humid environment products with high anti-corrosion requirements, prioritize A360 alloy. For sealed, pressure-resistant hydraulic parts, select A413; for high-wear mechanical structural parts, choose A390. In actual production, manufacturers need to combine product usage environment, structural complexity, performance indicators and customer budget to make targeted selection.
Reasonable alloy selection can effectively reduce defective rate, improve production efficiency, save post-processing costs, and enhance product market competitiveness. Cooperating with professional die-casting manufacturers for alloy customization and process optimization is the key to obtaining high-quality die-cast aluminum parts


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