Q235C coiled sheets are commonly used in the manufacturing of various structural components, and their bending performance is one of the key indicators for evaluating their processability and applicability. Bending performance primarily depends on the material's mechanical properties and processing techniques.

Firstly, the tensile strength and yield strength of Q235C coiled sheets are important factors influencing their bending performance. High-strength steel typically exhibits better bending resistance, enabling it to withstand deformation and damage from external forces. Therefore, Q235C coiled sheets generally possess moderate strength to ensure minimal plastic deformation and fracture during bending.

Secondly, the cold work hardening properties of the material also affect the bending performance of the coiled sheets. During the processing of coiled sheets, the material undergoes cold work hardening, which increases its tensile strength and hardness but also raises its brittleness. Thus, when designing the bending process for coiled sheets, it is essential to appropriately control the degree of deformation and hardening to prevent cracks and deformation during bending.

Additionally, the surface quality and flatness of the coiled sheets influence their bending performance. Coiled sheets with good surface quality generally offer better processability, reducing friction and damage during processing, thereby improving bending quality and efficiency. Conversely, coiled sheets with poor flatness are prone to localized stress concentration and deformation, affecting the precision and stability of bending.

In summary, the bending performance of Q235C coiled sheets is influenced by various factors, including the material's mechanical properties, processing techniques, and surface quality. To ensure good processability and stability during bending, it is necessary to comprehensively consider these factors and adopt appropriate design and processing measures.