The difference between steel ring and cast iron ring

The piston ring is one of the key components in the engine. It is mainly used to seal the gap between the piston and the cylinder liner, prevent the leakage of high temperature and high pressure gas in the combustion chamber, and also play a lubricating role.

1. Definitions and Uses

The piston ring is one of the key components in the engine. It is mainly used to seal the gap between the piston and the cylinder liner to prevent the leakage of high temperature and high pressure gas in the combustion chamber. At the same time, it can also play a lubricating role and reduce the wear of the piston and the cylinder liner. There are many types of piston rings, which can be divided into steel rings and cast iron rings according to material classification.

2. material and performance

1. Piston ring steel ring

Piston ring steel ring is usually made of high manganese steel or dual-phase steel. It has the characteristics of high hardness, strength and toughness, and good wear resistance. It can withstand the huge pressure and friction and wear under high temperature and high pressure environment, and can also effectively prevent the piston and The gas leakage between the cylinder liner. Therefore, piston ring steel rings are usually used in high-performance engines or heavy-duty engines.

2. Cast iron ring

Cast iron rings are usually made of gray cast iron or ductile iron, which has excellent wear resistance and lubrication performance, and is relatively cheap. However, due to the relatively low hardness of cast iron, it is prone to deformation and wear under high load, high temperature and high pressure environment, resulting in leakage between the piston and the cylinder liner. Therefore, cast iron rings are commonly used in low and medium performance engines.

3. selection recommendations

In practical applications, the choice of suitable piston ring steel ring or cast iron ring should be comprehensively considered according to the engine's power, speed, load and other factors. Generally speaking, high-performance engines or heavy-duty engines should choose high-hardness, high-strength and toughness piston ring steel rings to ensure engine stability and durability; low-and medium-performance engines can choose cast iron rings with high price ratios. At the same time, when replacing the piston ring, attention should also be paid to matching the piston ring of the original model to avoid unnecessary costs and troubles.

[Summary] This paper introduces the difference between steel ring and cast iron ring, and compares the material and performance. In practical applications, the appropriate piston ring type should be selected according to the performance characteristics and requirements of the engine.