Service
China Aluminum gravity casting manufacturer
Complex shapes, T6 heat treatment, and high-strength performance.
Aluminum Gravity Casting Services
Gravity die casting is a common process that uses gravity to pour molten metal into a mold. Once the metal cools and solidifies, it forms the desired shape.
The molds in gravity casting are typically made of steel, with a lifespan of 150,000 to 200,000 cycles. With high-quality steel, mold life can exceed 400,000 cycles, which is why this method is also known as permanent mold casting.
Aluminum is the most commonly used material for gravity die casting. Compared to sand casting, aluminum gravity castings offer better precision and surface finish. Unlike high-pressure die casting, these parts can be T6 heat treated, improving mechanical properties and air tightness. This makes gravity casting ideal for producing complex, high-performance aluminum components.
Since 2003, Sanon Casting has been using gravity die casting to produce high-quality aluminum parts for industries such as automotive, machinery, and power. We use advanced gravity die casting machines and automation systems that improve both precision and production efficiency. This technological investment ensures that our customers receive consistent, high-quality aluminum castings at competitive prices.

materials
Aluminum gravity casting alloys & applications
Aluminum and its broad range of alloys are the most preferred materials for gravity die casting due to their relatively low melting point, good fluidity when molten, cost-effectiveness, and favorable mechanical properties in the finished product.
Among these alloys, A356 is the one most commonly used for gravity casting at Sanon Casting.
alloys
- GB Standard: ZL101, ZL101A, ZL102, ZL104, ZL107
- ASMT Standard: A319, A356, A357, A413
- BS Standard: LM6, LM20, LM25
- EN Standard: EN AC-42100, 42200, 43000, 432000, 43300, etc
applications
- Automotive
- Electric Vehicles
- Construction
- Electrical
- Medical Devices
- Industrial Machinery
- Marine
- Lighting
- Other Industries
our gravity die casting process
At Sanon Casting, we specialize in high-quality gravity die casting for industries like automotive, machinery, and power. By combining advanced technology with years of experience, we ensure that each part we create meets your exact specifications. Below is an overview of the key steps we take to produce top-notch aluminum castings for your needs:
Mold Design and Preparation
We design and build all our molds in-house, which helps keep costs down for you. Our high-quality molds ensure that molten aluminum flows smoothly and forms the right shape, with no defects.
Molten Aluminum Pouring
We melt the aluminum alloy to the right temperature and pour it into the mold using our advanced gravity die casting machines. The automated process means you get precise, consistent castings without the errors that come from manual pouring.
Cooling and Ejection
Once the aluminum cools and solidifies, we carefully remove it from the mold. Throughout the cooling process, we monitor everything to prevent cracks and deformation, so you get a perfect result every time.
T6 Heat Treatment
After cooling, we perform T6 heat treatment on the castings, which is a critical step. This process strengthens the aluminum, improving its mechanical properties like hardness and durability. T6 heat treatment ensures your castings can withstand higher stresses and perform better in demanding applications.
Post-Processing and Quality Inspection
After heat treatment, we move on to post-processing, which includes deburring, grinding, CNC machining, shot blasting, and surface treatments. These steps refine the castings, ensuring they’re smooth, precise, and ready for use.
We offer a variety of surface treatments like polishing, passivation, powder coating, painting, and electrophoresis. These treatments enhance the appearance, corrosion resistance, and durability of the castings, ensuring they meet your specific requirements.
Surface treatment if needed
Quality control is integrated into every step of our process. From mold design to final inspection, we carefully monitor the entire production cycle. We test size, hardness, strength, and surface quality at each stage, using high-precision equipment.
Our quality control follows ISO 9001 standards, ensuring your castings meet both ISO 9001 and ASTM requirements. We also conduct additional tests like air tightness and mechanical performance to guarantee your parts perform reliably in tough conditions.
aluminum gravity casting manufacturer
Why Choose Sanon Casting for Aluminum Gravity Casting?
Expertise and Experience
With years of experience, we offer tailored aluminum casting solutions for a wide range of alloys and applications, ensuring each part meets your needs.
Advanced Equipment and Automation
Our investment in advanced machines and automation boosts precision and efficiency, ensuring you get high-quality castings at competitive prices.
Flexible Production Capabilities
Whether you need large volumes or small batches, we’re ready to deliver quickly and meet tight deadlines.
Strict Quality Control
From start to finish, we use top-quality testing and controls to make sure every casting meets industry standards.
Gravity Casting vs. Die Casting vs. Sand Casting
Gravity casting has several advantages over high pressure die casting and sand casting. It offers better mechanical properties, higher precision, and can handle complex shapes. It’s ideal for medium to low-volume production, especially for aluminum parts that require a smooth surface finish and high performance. Below are the key advantages of gravity die casting:
Gravity Casting vs. High Pressure Die Casting
Advantages:
1. Stronger Mechanical Properties. Gravity casting allows for T6 heat treatment, which boosts strength, hardness, and overall durability.
2. Great for Complex Shapes & Larger Parts. It can handle more complex and larger parts that may be challenging for high-pressure die casting.
3. Lower Internal Stress & Less Deformation. The slower cooling process reduces internal stress, minimizing cracks and deformations, especially for bigger or thinner parts.
4. Lower Mold Costs. Molds for gravity casting are more affordable and last longer, making it more cost-effective for medium-sized production runs.
5. Better Air Tightness. Gravity casting parts typically have better air tightness, which is essential for certain applications.
Gravity Casting vs. Sand Casting
Advantages:
1. Higher Precision & Smoother Surface. Gravity casting produces parts with better dimensional accuracy and a smoother surface finish, reducing the need for post-machining.
2. Longer Mold Life. Unlike sand molds, which are single-use, gravity casting molds are reusable, making them more cost-effective for medium to large production runs.
3. Lower Porosity & Better Air Tightness. The controlled metal flow in gravity casting reduces porosity, resulting in better air tightness—critical for applications like pumps, valves, and hydraulic systems.
4. More Consistent Quality. Because metal molds provide better thermal control and repeatability, gravity die casting ensures more uniform and reliable part quality compared to sand casting.