Can be divided into straight seam welded pipes and spiral welded pipes
Straight seam welded pipe
The production process is simple, the production efficiency is high, the cost is low, and the development is fast.
Spiral welded pipe
The strength is generally higher than that of straight seam welded pipes, and larger diameter welded pipes can be produced using narrower billets. It is also possible to produce welded pipes with different diameters using billets of the same width. However, compared to straight seam pipes of the same length, the weld length increases by 30-100% and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while larger diameter welded pipes mostly use spiral welding.
Spiral seam welded steel pipes are divided into two types: automatic submerged arc welded steel pipes and high-frequency welded steel pipes.
a. Spiral seam automatic submerged arc welded steel pipes are divided into two categories based on the pressure of the conveying medium: Class A pipes and Class B pipes. Class A pipes are generally welded with ordinary carbon steel Q235, Q235F and ordinary low alloy structural steel 16Mn, while Class B pipes are welded with Q235, Q235F, Q195 and other steel materials, used as low pressure fluid conveying pipes
b. Spiral seam high-frequency welded steel pipe There is no unified product standard for spiral seam high-frequency welded steel pipe, and it is generally made of ordinary carbon steel Q235, Q235F and other steel materials.
