The process of cold forming employs a series of matching profiles rolls driven in multiple stands, through which metal strip is passed without application of heat. Each pair of rolls progressively shapes metal, until the final pair products the required profile. The following figure illustrates manufacturing process.

Cold Roll Forming Process

The cold roll forming process includes a strain hardening effect in steel thereby increasing the yield strength. A comparison of yield stength-virgin and after cold roll forming for a typical cross section is shown in following figure.

Effect of cold roll on mechanical properties in cold form
steel sections.