Generally speaking, there are two ways to calculate the straightness or bending degree of cold-drawn steel pipes: cold-drawn steel pipes, seamless steel pipes or straight seam steel pipes. That is, to measure the chord height (m m) at the maximum bending point of steel pipes by measuring the length of one meter, i.e. the local bending degree in M m/m, which is expressed as 2.5m m/m. This method is also applicable to the bending of the end of the pipe. 二、冷拔钢管全长总弯曲度：用一根细绳，从管的两端拉紧，测量冷拔钢管弯曲处最大弦高（mm），然后换算成长度（以米计）的百分数，即为钢管长度方向的全长弯曲度。
2. Total Bending of Cold Drawn Steel Pipe: Measure the Maximum Chord Height (mm) at the bending point of the steel pipe with a thin rope tensioned from both ends of the pipe, and then convert the percentage of the growth (in meters), that is, the full length bending of the steel pipe in the length direction.
For example, if the length of cold-drawn steel tube is 10m and the maximum chord height is 30mm, the bending degree of the whole length of the tube should be as follows:
0.03_10m x 100%=0.3%
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