The strength of spiral welded pipe in steel pipe is generally higher than that of straight welded pipe. It can be used to produce larger diameter welded pipe with narrow blank, and it can also be used to produce different diameter welded pipe with the same width blank. But compared with the same length of straight seam pipe, the weld length increases by 30 ~ 100%, and the production speed is lower.
Spiral welded steel pipe is divided into automatic submerged arc welded steel pipe and high frequency welded steel pipe. Spiral seam automatic submerged arc welded steel pipe is divided into class a pipe and class B pipe according to the pressure of conveying medium.
Class a pipe is generally welded with ordinary carbon steel Q235, Q235F and ordinary Low Alloy Structural Steel 16Mn, while class B pipe is welded with Q235, Q235F, Q195 and other steel, which is used as low pressure fluid conveying pipe.
There is no unified product standard for spiral seam high frequency welded steel pipe, which is generally made of ordinary carbon steel Q235, Q235F etc.
