ALUMINUM CASTING SERVICES
High-Quality Custom & OEM Aluminum Castings
SIMIS provides aluminum casting solutions from three specialized foundries in China. We produce high-quality custom and OEM cast aluminum parts and components using investment casting, gravity die casting, and pressure die casting. Our facility supplies aluminum castings to sectors such as aerospace, automotive, telecommunications, railway, and oil and gas. We aim to deliver high-performance parts at a competitive price point by using our regional manufacturing advantages and logistics networks.
We manage the entire project lifecycle to offer a single-source experience. This includes initial tooling, post-casting heat treatment, CNC machining, and rigorous quality inspection. SIMIS possesses the technical expertise to produce heavy-duty components or intricate designs with tight tolerances.
What is Aluminum Casting?
Aluminum casting is a manufacturing process where molten aluminum is poured or injected into a mold to create specific geometries. Once the metal cools and solidifies, it retains the mold shape to form the finished part. This technique is favored for producing lightweight, durable parts across many key industries.
Aluminum can be cast using several specialized methods—such as investment casting, gravity die casting, and pressure die casting—each offering unique advantages in terms of surface finish, structural integrity, and production volume.
Cast aluminum possesses an exceptional strength-to-weight ratio and natural corrosion resistance. Properties can be improved by alloying with silicon, magnesium, or copper. These alloys are categorized into three main types based on their primary characteristics: silicon-based, magnesium-based, and copper-based. Each provides unique advantages and is selected according to the requirements of the specific application.
Our Aluminum Casting Processes
To achieve the best results for every project, SIMIS offers three core aluminum casting processes: investment, gravity die, and pressure die casting. Each technique provides distinct advantages in terms of dimensional tolerance and structural integrity. Whether you require high-volume production or intricate, small-batch components, we analyze your requirements to determine the most suitable and cost-effective method for your finished parts.
Investment Casting
Investment casting is typically reserved for high-end aluminum components, such as those used in the aerospace and defense industries. This process is capable of achieving extremely complex geometries and tight tolerance requirements; however, it is the most expensive among the three casting methods.
Gravity Die Casting
Gravity die casting is a highly effective process for producing structural aluminum components with excellent mechanical properties. This method is ideal for medium-to-high volume production of parts like engine heads and brackets. It offers a superior balance of strength and cost-efficiency compared to investment casting.
Pressure Die Casting
Pressure die casting is the most efficient process for high-volume production of aluminum parts with thin walls and intricate details. It uses high pressure to inject molten metal into steel molds, ensuring excellent dimensional consistency. While tooling costs are higher, it is the most cost-effective method for large-scale manufacturing.
Advantages of Aluminum Casting
Aluminum casting is a globally utilized manufacturing method known for its strength-to-weight ratio and process versatility. These techniques are ideal for producing the lightweight, high-performance components used in aerospace, automotive, and electronics. Key advantages include corrosion resistance, high thermal and electrical conductivity, dimensional stability, and a capacity for intricate geometries. This combination of benefits allows aluminum castings to achieve efficiency and deliver value across challenging operational environments.
Superior Strength-to-Weight Ratio
Aluminum is approximately one-third the weight of steel or copper. This allows for the production of lightweight components that maintain high structural strength, which is critical for reducing fuel consumption in automotive applications and improving portability in consumer electronics.
Excellent Corrosion Resistance
Aluminum naturally generates a protective oxide layer when exposed to air, providing inherent resistance to rust and environmental decay. This makes cast aluminum parts ideal for use in harsh conditions, including marine, chemical, and outdoor industrial environments.
Intricate Geometry Capabilities
Casting of aluminum provides design freedom that machining and fabrication cannot achieve. It allows for the creation of complex internal cavities, undercuts, and organic shapes in a single piece. This reduces the need for multi-part assembly and welding, resulting in stronger, more unified components.
High Thermal and Electrical Conductivity
Among common casting metals, aluminum stands out for its ability to transfer heat and electricity efficiently. It is the primary choice for heat sinks, engine cooling components, and electrical housings where rapid heat dissipation is required to ensure performance.
Exceptional Dimensional Stability
Aluminum alloys maintain high dimensional accuracy even when cast into complex shapes with thin walls. This stability ensures that parts remain consistent throughout high-volume production runs and perform reliably under varying temperatures and mechanical stress.
Common Aluminum Casting Grades
Optimizing your product starts with the right aluminum grade. Each alloy offers a unique combination of strength, castability, and weight-saving benefits suitable for diverse industrial needs. At SIMIS, we support your projects with a wide selection of standard aluminum grades fully compliant with global quality specifications. Please review the list of grades below to identify the most effective material for your project requirements. For specialized applications requiring alloys not listed here, please contact us to discuss the specific material solutions.
ANSI/AA A356
Key Properties
This silicon-magnesium aluminum alloy is prized for its excellent castability and high ductility after T6 heat treatment. It offers high strength and good weldability.
Typical Applications
It is the industry standard for structural automotive parts, high-strength brackets, aircraft fittings, and high-performance industrial machinery components.
ANSI/AA A380
Key Properties
As the most popular pressure die casting aluminum alloy, it provides a superior balance of thermal conductivity, fluidity, and pressure tightness during production.
Typical Applications
This grade is widely used for electronic housings, engine components, transmission cases, and various household power tools.
JIS ADC12 (ANSI/AA A383)
Key Properties
This medium carbon steel provides significantly higher strength and modest wear resistance compared to low-carbon grades.
Typical Applications
It is typically used for intricate, thin-walled automotive engine components and complex telecommunications equipment.
ANSI/AA 204
Key Properties
A copper-based aluminum alloy used in investment casting for “steel-like” performance. It maintains high strength and hardness even at elevated temperatures.
Typical Applications
This grade is reserved for critical aerospace structural parts, high-tension military hardware, and specialized engine components.
ANSI/AA 535 (Almag 35)
Key Properties
Known for the highest strength of any as-cast aluminum alloy without needing heat treatment. It offers excellent corrosion resistance and a beautiful surface finish.
Typical Applications
It is frequently used for marine hardware, decorative architectural parts, and structural components where heat-treating is not feasible.
ANSI/AA A319
Key Properties
This grade provides an excellent mix of casting ease and good mechanical properties without requiring expensive heat treatments. It offers good pressure tightness.
Typical Applications
A staple for gravity die casting, it is commonly used for engine blocks, cylinder heads, and intake manifolds.
ANSI/AA 443
Key Properties
This aluminum alloy contains silicon for good fluidity but is specifically designed for superior pressure tightness and excellent resistance to chemical corrosion.
Typical Applications
Primarily used in investment and gravity casting for food processing equipment, dairy machinery, and intricate marine fittings.
ANSI/AA 514
Key Properties
This magnesium-based aluminum alloy provides the highest level of corrosion resistance. It is highly durable and can be polished to a decorative, high-quality shine.
Typical Applications
It is the preferred choice for hardware used in marine environments and high-end architectural or ornamental fittings.
ANSI/AA 355
Key Properties
This aluminum alloy maintains its structural integrity and strength even when subjected to high operating temperatures. It offers excellent pressure tightness.
Typical Applications
The top choice for gravity casting of pressure-tight components, heavy-duty cooling fans, and high-speed impellers.
ANSI/AA A413
Key Properties
Featuring a very high silicon content, this aluminum alloy is exceptionally fluid with virtually zero shrinkage. It is ideal for thin-walled, leak-proof designs.
Typical Applications
Primarily used in pressure die casting for extremely complex components, heat exchangers, and moisture-proof housings.
ANSI/AA A360
Key Properties
This grade offers better corrosion resistance and higher strength at elevated temperatures than A380. It provides excellent ductility and fluidity.
Typical Applications
Often chosen for pressure die casting of maritime equipment, irrigation parts, and protective industrial instrument cases.
ANSI/AA B390
Key Properties
This specialty aluminum alloy is extremely hard and wear-resistant due to its high silicon and copper content. It provides excellent friction performance.
Typical Applications
Most frequently used for pressure die casting of engine pistons, brake cylinders, and air compressor bodies.
Surface Treatment Options for Aluminum Castings
Post-casting surface treatments are important for maximizing the lifespan and functionality of aluminum components. These solutions offer not only decoration, but a high degree of defense against corrosion and mechanical friction. Our in-house surface treatment capabilities include anodizing, chemical conversion coating, powder coating, e-coating, painting, and bead blasting. Our surface treatment options cover most industrial finishing requirements while being significantly less expensive than third-party providers.
Anodizing
Anodizing is an electrochemical process that converts the aluminum casting surface into a durable, integrated layer of aluminum oxide. It provides superior wear resistance and high-performance corrosion protection while offering a wide range of decorative color options.
Chemical Conversion
Chemical Conversion coating is a passivation process that reacts with the aluminum surface to form a thin, protective film. This treatment provides reliable corrosion resistance and serves as an ideal primer base without sacrificing the component's electrical conductivity.
Powder Coating
Powder Coating is a dry finishing process that applies a protective polymer layer on aluminum castings which is cured under heat. This treatment creates a thick, impact-resistant barrier with excellent UV stability and is available in a wide range of colors and textures.
E-Coating
E-Coating is an immersion process that uses electrical current to deposit a uniform, corrosion-resistant paint layer on the surface of aluminum castings. This treatment allows for 100% coverage on complex geometries and internal recesses, providing a consistent finish with high material efficiency.
Painting
Painting is a liquid coating process that applies an organic layer to the casting surface for enhanced aesthetic appeal. This treatment provides a versatile finish and high-performance protection against chemical exposure and environmental weathering in diverse service environments.
Bead Blasting
Bead Blasting is a mechanical process that uses spherical glass media to create a uniform, matte-satin finish for aluminum castings. This treatment effectively removes casting lines and surface imperfections without causing any measurable dimensional change to the component.
Applications and Industries Benefit From Aluminum Casting
Aluminum casting provides an efficient manufacturing solution for applications requiring thermal management, electromagnetic shielding, and weight reduction. Aluminum alloys improve system efficiency and heat dissipation, offering a balance of lightweight properties and structural reliability for the railway, automotive, consumer electronics, aerospace, lighting, and telecom industries across the global market.
Railway Aluminum Castings
Aluminum castings are used in the railway industry for infrastructure and signaling due to durability and weather resistance. Because cast aluminum is lightweight, it is easy to use for housings protecting trackside electronics in remote locations. Its natural corrosion resistance allows outdoor components to remain functional for decades without heavy maintenance.
We specialize in producing rugged components for trackside equipment and control systems. A360 is often selected for signal control boxes and point machine housings because of its superior corrosion resistance and ability to withstand harsh environmental exposure.
For internal mechanical components that require higher ductility, such as mounting brackets and lever arms, we use A356 (T6). These alloys provide the long-term reliability needed for safety-critical railway infrastructure and various demanding outdoor systems operating in extremely harsh weather environments.
Automotive Aluminum Castings
Aluminum castings offer weight savings and heat dissipation for the automotive industry. Using aluminum improves fuel efficiency and battery range without sacrificing durability. Aluminum casting creates complex, one-piece components that reduce assembly and machining, meeting strict tolerances and performance standards.
We produce a variety of engine and transmission accessories as well as other bespoke components using high-performance alloys. A380 is our most common choice for high-volume parts like gearbox housings, clutch housings, and oil pans because of its excellent stability and fluid flow during casting.
For components that require higher strength and pressure tightness, such as intake manifolds or water pump housings, we mainly use A356 (T6). These grades ensure that accessories remain reliable even when subjected to constant vibration and high operating temperatures.
Pump and Valve Aluminum Castings
In the fluid handling industry, aluminum castings create lightweight, high-strength housings for pumps and valves. Excellent castability allows for smooth internal flow paths, reducing turbulence and improving efficiency. This makes it a reliable choice for fueling and water systems where transport and pressure tightness are required.
Our pump and valve components are engineered to handle consistent pressure and fluid flow. We primarily use A356 (T6) for pump bodies and valve manifolds because it provides the pressure tightness and strength necessary to prevent leaks under load.
For smaller accessories like handles, adjustment knobs, and mounting flanges, we often use A380 due to its cost-efficiency and excellent dimensional accuracy. These materials guarantee a long service life in both industrial and commercial plumbing environments while providing reliable performance for various demanding applications.
Consumer Electronics Aluminum Castings
Cast aluminum is the gold standard for consumer electronics thanks to its premium aesthetic and exceptional thermal management properties. It effectively pulls heat away from internal processors, preventing overheating in compact devices. Casting allows for incredibly thin walls and intricate internal details, enabling designers to create sleek, modern products that are both lightweight and structurally rigid.
We provide high-precision castings for a wide range of electronic devices and enclosures. We often use ADC12 or A380 for laptop frames, tablet housings, traffic light housings, and heat sinks because these alloys offer the high fluidity needed for very thin-walled sections.
For high-end audio components or wearable device frames that require a superior surface finish for anodizing, we use specialized Al-Mg alloys. These material options provide the required durability for the final castings while maintaining a high-quality, professional appearance.
Aerospace Aluminum Castings
Aluminum castings are frequently used in the aerospace industry to minimize aircraft weight while maintaining high structural integrity. Reducing weight is the most effective way to lower fuel consumption and increase payload capacity.
Aluminum casting is effective for creating complex, aerodynamically efficient shapes that are difficult to achieve through machining, which makes it useful for both commercial and defense aviation applications.
We cast a variety of high-precision aerospace accessories and mechanical components. For parts requiring high rotational speed and pressure tightness, such as impellers and internal gear components, we utilize A356 (T6). For secondary structural parts like avionics trays, mounting brackets, hinge assemblies, and chain-link connectors, we use A380 and other specialized grades for their excellent stability and strength-to-weight ratio.
Telecommunication Aluminum Castings
In the telecommunications sector, aluminum castings provide excellent thermal conductivity and electromagnetic shielding. Aluminum housings protect 5G and wireless equipment from environmental damage while dissipating heat from electronic components. The lightweight nature of cast aluminum also allows technicians to safely install equipment on tall towers and rooftops.
We regularly cast high-precision enclosures and thermal management solutions for the telecom industry. A380 is the standard choice for junction boxes and waterproof telecom enclosures because it offers great dimensional stability and high fluidity for thin-walled designs.
For heat sinks and cooling fins that require maximum thermal transfer, we often use ADC12. These materials provide the durability and heat management necessary to keep global communication networks running reliably in all weather conditions.
Lighting Industry Aluminum Castings
Aluminum alloys are used in the lighting industry as a natural heat sink, extending the lifespan of LED components. Cast aluminum provides durable, corrosion-resistant housings that withstand high temperatures and outdoor exposure typical of industrial and street lighting. The process allows for intricate cooling fins and decorative shapes that combine thermal management with modern aesthetic appeal.
Our lighting castings focus on durability and heat dissipation for commercial and industrial fixtures. We primarily use A380 for street light housings, stadium floodlights, and high-bay fixtures due to its excellent balance of castability and thermal performance.
For specialized decorative outdoor lamps that require a high-quality surface for powder coating or painting, we use A360. These grades allow lighting systems to remain cool and protected from the elements, reducing the need for frequent maintenance.
Industrial Machinery Aluminum Castings
Aluminum castings are used in industrial machinery to reduce the weight of moving parts, lowering energy consumption and improving machine speed. The material’s high vibration-damping capacity stabilizes equipment during operation, leading to better precision and less mechanical wear. Its corrosion resistance is also a benefit for machinery used in chemical processing or food and beverage environments.
We produce a range of high-performance cast aluminum parts for factory automation and power tools. A380 is commonly used for motor housings, gear covers, and hand tool frames because of its high impact resistance and lightweight feel.
For demanding components like linkage arms and pneumatic cylinders, we specify A356 (T6) for superior strength. These aluminum grades help industrial equipment operate efficiently while withstanding the rigors of high-volume production.
Why Choose SIMIS For Aluminum Casting Services?
As a leading integrated manufacturer in China, Taiyuan SIMIS specializes in high-performance aluminum casting services for global industries. By managing all pre-casting design and post-casting processes in-house, we eliminate supply chain complexity and uphold strict quality control at every stage. We deliver fully finished, high-precision aluminum parts that are ready for immediate assembly, providing our clients with significant cost savings and superior structural reliability.
Quality Assured
Every aluminum casting is 100% inspected and remains fully traceable. We supply detailed reports covering chemical analysis and mechanical testing.
Rich Experience
With over 20 years of experience, we possess deep expertise in multiple aluminum casting processes, spanning from initial tooling design to casting.
Advanced Equipment
Utilizing cutting-edge equipment, our facilities balance automated and manual operations. We use advanced simulation software to optimize every project for top quality standards.
Material Expertise
We cast aluminum alloys in both standard and specialized grades. Our production meets a comprehensive range of international quality and manufacturing standards.
Competitive Pricing
Using advanced equipment and refined manufacturing processes, we provide high-quality aluminum components at competitive price points.
Fast Turnaround
Featuring state-of-the-art casting simulation and high-capacity production lines, our optimized workflow guarantees accelerated turnaround times for every aluminum casting.
Additional Value-Added Services
SIMIS provides integrated manufacturing solutions beyond the pour. By managing tooling design, T6 heat treatment, surface finishing, and assembly in-house, we eliminate third-party delays. Our dedicated labs verify every stage, facilitating a seamless process that delivers high-performance aluminum castings with significant logistical and cost advantages.
Aluminum Casting Frequently Asked Questions
(FAQs)
What are the main differences between sand casting and die casting for aluminum?
Sand casting is typically used for low-to-medium volume production or for very large, complex parts, offering lower initial tooling costs but requiring more secondary machining. In contrast, aluminum die casting is an automated process ideal for high-volume production, providing superior surface finishes and tighter dimensional tolerances. The choice between them depends largely on your production volume, part size, and required surface quality.
How do you manage porosity issue in aluminum castings?
Porosity is usually unavoidable, but is managed through a combination of vacuum-assisted casting, precise temperature control, and the use of specialized filtration systems. By monitoring the cooling rate and gas content of the melt, we minimize the formation of gas or shrinkage pores.
Our in-house X-ray inspection capabilities allow us to monitor internal integrity and adjust our processes to keep porosity within acceptable limits. Besides this, we use weld repair to fix any porosity after they appear, rest assured, no defective parts can leave our foundry.
Can you cast aluminum parts with complex internal geometries?
Absolutely, we specialize in complex geometries by using advanced coring techniques, particularly in our investment casting processes. For die casting, we use sophisticated slide and core pull mechanisms within the mold. These methods allow us to create intricate internal passages and hollow sections that would be impossible or too expensive to achieve through traditional machining alone.
Is heat treatment necessary for all aluminum castings?
Heat treatment is not always mandatory, but it is frequently used to enhance the mechanical properties of the alloy. For example, the T6 heat treatment process involves solution heat treating and artificial aging to significantly increase the tensile strength and hardness of the part. We evaluate the end-use application of your component to determine if heat treatment is required to meet your performance specifications.
Can aluminum castings be welded or joined to other components?
Yes, many aluminum alloys used in casting offer good weldability. However, it is important to select the correct filler material and welding technique to maintain the strength of the joint.
We can provide guidance on the best alloy selection if your assembly requires welding, and we also offer in-house drilling and tapping services for mechanical fastening and assembly.
How do you manage thermal expansion in aluminum casting design?
Aluminum has a relatively high coefficient of thermal expansion compared to steel or iron. Our engineering team accounts for this during the tooling design phase by applying specific shrinkage allowances to the mold dimensions. We also consider the thermal operating environment of the final part to ensure that tolerances remain within specification even when the component reaches high operating temperatures in the field.
Can you assist with converting a multi-part assembly into a single aluminum casting?
This is one of our core strengths. Our engineers work with clients to perform “casting conversion” analysis, where we take complex assemblies made of multiple machined or welded parts and redesign them as a single, integrated aluminum casting. This not only reduces the overall weight and assembly time but also eliminates potential points of failure at joints and lowers the total cost of the component.
What are the advantages of using A356 aluminum alloy specifically?
A356 is one of the most popular aluminum alloys because it offers a perfect balance of castability, strength, and corrosion resistance. It is particularly responsive to T6 heat treatment, which allows it to achieve the high tensile strength required for safety-critical automotive and aerospace brackets. Its excellent flow characteristics also make it the preferred choice for complex, pressure-tight housings.
How do you ensure the purity of the raw aluminum ingots used?
Quality starts with the raw material. We source our aluminum ingots only from certified suppliers who provide detailed melt analysis reports. Upon arrival at our facility, we perform our own spectrographic analysis to verify that the chemical composition matches the required standards. This prevents “tramp elements” from entering our production line, which could otherwise compromise the mechanical properties of the finished castings.
How can I choose the most suitable aluminum grade for my project?
Selecting the ideal aluminum alloy depends on a comprehensive evaluation of your component’s mechanical, thermal, and environmental requirements, along with the casting process used and your budget. Our engineering team helps you choose a grade by analyzing key factors such as the necessary strength-to-weight ratio, the need for pressure tightness, and whether the part will be exposed to corrosive elements like saltwater or chemicals.
We also consider post-casting requirements, such as whether the part needs to be welded, T6 heat-treated for hardness, or anodized for a decorative finish. By assessing these variables during the design phase, we make sure the selected material optimizes both part performance and manufacturing cost-effectiveness.
