Strength is generally higher than the straight seam welded pipe, can use a narrow blank diameter pipe production of larger, you can also use the same width of the blank diameter pipe production of different pipe. However, compared with the same length of the straight seam pipe, weld length increased by 30 to 100%, and the production rate is low. Therefore, most of the smaller diameter welded pipe straight seam welding, large diameter spiral welded pipe are mostly used.
Spiral seam welded steel pipe is divided into automatic submerged arc welded steel pipe and high-frequency welded steel two.
A. Spiral seam Automatic submerged arc welded steel pipe according to the pressure of the transmission medium is divided into a class A and B class pipe two categories. A class of general use of ordinary carbon steel Q235, Q235F and ordinary low-alloy steel 16Mn welding, B-type pipe using Q235, Q235F, Q195 and other steel welding system for low pressure fluid conveying pipe
B. Spiral seam high-frequency welded steel pipe spiral seam high-frequency welded steel pipe, there is no uniform product standards, the general use of ordinary carbon steel Q235, Q235F and other steel products.
