Carbon steel is a commonly used material for constructing machine structures, particularly in the automobile and machinery industries. This type of steel is desirable for its affordability, ease of processing, and excellent mechanical properties following heat treatment.

This material finds application in the production of mechanical and automobile parts, including chains, friction plates, and re-rolling processes.

S15C, which can be spheroidized annealed to improve formability. This makes it suitable for use in the seat adjustment systems of machinery, where fine-blanking processes are required.

S35C, has good hardenability and properties that can be adjusted through various heat treatment methods. Higher carbon content in steel can lead to increased strength after heat treatment, but there is also an increased risk of distortion and cracking.