Scaffold twists are caused by improper mill adjustment, residual stresses during rolling, and uneven cooling along the section and length of the tube. Therefore, it is not possible to directly obtain very straight pipes from the rolling mill, as long as the straightness of the pipes is straightened by cold to satisfy the rules of the skill conditions.

The basic principle of straightening is to make the scaffold perform elastic-plastic twists, from large twists to small twists, so it is necessary for the steel pipe to be repeatedly twisted in the straightener. The degree of repeated twists and turns of the steel pipe is mainly determined by the adjustment of the straightening machine.
There are many factors that affect the quality of straightening, such as the tortuosity of the original pipe, the size of the steel pipe and the type of material straightening, adjustment parameters, etc.
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