Reciprocating compressor connecting rods are constructed of:

Reciprocating compressor connecting rods are primarily constructed of forged steel due to the material's excellent strength-to-weight ratio, durability, and ability to withstand high stresses during operation. Forged steel provides superior mechanical properties when compared to other materials, making it ideal for components that experience significant force and require reliable performance under varying loads.

Forged steel is also less likely to fail under high cyclic loads, which is critical in reciprocating compressors where components undergo repeated motion. The forging process aligns the grain structure of the steel, imparting enhanced toughness and resistance to fatigue, which is essential for the long life of the connecting rods.

While cast iron is known for its good wear resistance and low cost, it lacks the tensile strength and ductility required for connecting rods, making it unsuitable for this application. Stainless steel, while resistant to corrosion, is generally more expensive and heavier than forged steel, which can be a disadvantage in dynamic applications. Brass is not used in this application due to its lower tensile strength and wear resistance compared to steel. Thus, forged steel stands out as the most appropriate choice for providing the necessary performance characteristics in reciprocating compressors.