Aluminum alloy casting
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What is the best aluminum alloy for die casting?
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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What materials are used in gravity die casting?
Gravity die casting (GDC) uses two key types of materials: mold materials and casting materials, both optimized for the process’s low-pressure, gravity-driven filling method.
Mold Materials: The reusable permanent mold (die) is typically made of cast iron or steel (e.g., H13 tool steel), which can withstand high temperatures (670–710°C for aluminum casting) and repeated use. Cast iron molds offer good heat retention and cost-effectiveness, while steel molds have higher durability (mold life 50,000–200,000 shots for aluminum alloys).
Casting Materials: Aluminum alloys are the most common (80% of GDC applications), including A356, A380, ADC12, AlSi9Cu3 — these have high fluidity and low shrinkage. Other materials include copper alloys (brass, bronze) and magnesium alloys, but aluminum is preferred for its lightweight, cost-efficiency, and mechanical properties. For high-strength parts, A356 T6 is the top choice for GDC, with tensile strength up to 320 MPa.
Mold Materials: The reusable permanent mold (die) is typically made of cast iron or steel (e.g., H13 tool steel), which can withstand high temperatures (670–710°C for aluminum casting) and repeated use. Cast iron molds offer good heat retention and cost-effectiveness, while steel molds have higher durability (mold life 50,000–200,000 shots for aluminum alloys).
Casting Materials: Aluminum alloys are the most common (80% of GDC applications), including A356, A380, ADC12, AlSi9Cu3 — these have high fluidity and low shrinkage. Other materials include copper alloys (brass, bronze) and magnesium alloys, but aluminum is preferred for its lightweight, cost-efficiency, and mechanical properties. For high-strength parts, A356 T6 is the top choice for GDC, with tensile strength up to 320 MPa.
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Do you provide DFM analysis for gravity casting?
Yes, our engineering team provides Design for Manufacturability analysis to optimize structure and cost.
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How about dimensional stability of gravity cast parts?
Dimensional stability is excellent, especially after heat treatment and finish machining.
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Can you make large aluminum gravity die casting parts?
Yes, we produce large and heavy gravity cast parts for machinery and automotive applications.
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What is the typical mold life for gravity die casting?
Mold life can reach tens of thousands to hundreds of thousands of shots depending on alloy and structure.
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Can you produce custom aluminium alloy gravity cast part?
Yes, we provide full custom service for gravity cast parts based on customer design.
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What industries use aluminum gravity die casting parts?
Automotive engine parts, hydraulic components, pump housings, flanges, brackets, and high‑stress mechanical parts.
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Can gravity die cast parts be T6 heat treated?
Yes, gravity die casting is especially suitable for T4/T6 heat treatment to improve tensile strength.
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What are the advantages of aluminium alloy gravity cast part?
Good mechanical performance, low porosity, heat treatable, lower mold cost, suitable for medium batch production.
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When should I choose gravity die casting over die casting?
Choose gravity die casting for medium volume, thick-walled parts, heat‑treatable parts, and high structural strength requirements.
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What is aluminum gravity die casting?
It uses gravity to fill molten aluminum alloy into a permanent metal mold, offering better density and strength.
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The company was founded in 2016, is a zinc alloy, aluminum alloy, copper casting, scientific research, development, production, sales as one of the professional custom cast aluminum parts manufacturers and enterprises.
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