What material are reciprocating compressor connecting rods typically constructed of?

Reciprocating compressor connecting rods are typically constructed of forged steel due to its excellent strength, toughness, and fatigue resistance, which are critical attributes for withstanding the high stresses and loads experienced during operation. The forging process aligns the grain flow in the steel, enhancing its mechanical properties and making it well-suited for the demanding conditions found in compressor applications.

While cast iron offers good wear resistance and is often used in more stationary components, it does not provide the same tensile strength and ductility required for connecting rods that can experience significant dynamic forces. Stainless steel, while corrosion-resistant and strong, is generally heavier and more expensive, making it less common for this application. Brass, known for its corrosion resistance and machinability, lacks the necessary strength for the high-load applications demanded by compressor connecting rods. Therefore, the use of forged steel allows for an optimal balance of performance and durability in reciprocating compressors.