Core product categories for automotive casting parts

1. Powertrain castings
The powertrain is the “heart” of the automobile, and castings play a critical role in it by providing support, transmitting power, and resisting heat.
Engine cylinder block / cylinder head
Made from gray cast iron and aluminum alloy, the cylinder block serves as the engine’s core structural framework. The cylinder block houses moving components such as the crankshaft and pistons, while the cylinder head seals the combustion chamber and accommodates the valve train and fuel injection system. Aluminum alloy cylinder blocks and cylinder heads can significantly reduce the overall vehicle weight, thereby improving fuel efficiency.
Crankshaft
Most are cast from ductile iron, while some high-performance models use forged steel. It converts the reciprocating motion of the piston into rotary motion and is subjected to alternating loads. The casting process must ensure that the internal structure is free from defects such as shrinkage cavities and porosity.
Transmission housing
Commonly cast from aluminum alloys and magnesium alloys, these components combine lightweight characteristics with high rigidity. They are used to house transmission parts such as gears and bearings and must feature excellent sealing performance and impact resistance.
2. Chassis system castings
Chassis components directly affect a vehicle’s handling, stability, and safety, and thus place extremely high demands on casting accuracy and mechanical performance.
Steering knuckle
The core safety component, made of ductile cast iron, connects the wheel, suspension, and steering tie rod. It bears the vertical load from the wheel, horizontal impact forces, and steering torque. After casting, it undergoes rigorous non-destructive testing.
Control arm (swing arm)
Some vehicle models use cast steel or aluminum alloy castings as control arms, which serve to connect the body to the wheels, transmit forces and torques, and ensure that the wheels move along the predetermined trajectory. Lightweight aluminum alloy control arms can enhance the suspension’s responsiveness.
Hub
They are divided into cast-iron wheel hubs (mainly for commercial vehicles) and aluminum alloy wheel hubs (mainly for passenger cars). These hubs bear the weight of the entire vehicle and absorb impacts during driving. Cast wheel hubs must meet stringent requirements regarding strength, dynamic balance, and other critical performance criteria.
3. Car body and other castings
Body structural components—such as door hinge mounts, engine mounts, and suspension supports—are often made from low-carbon steel or aluminum alloy castings. These components are used to enhance the body’s rigidity and secure the core components.
Exhaust system components—such as exhaust manifolds—are typically made from heat-resistant cast iron or stainless steel castings, which must withstand the corrosion and thermal shock caused by high-temperature exhaust gases while ensuring smooth exhaust flow.