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Straight seam welded steel pipe
The straight seam welded pipe is made of strip steel as raw material, and the pipe obtained by straight seam welding on high frequency welding equipment is called straight seam welded pipe. (Because the welded portion of the steel pipe is in a straight line, it is named)
Straight seam welded pipe technology
According to the standard of GB/T3092 "welded steel pipe for low-pressure fluid transport", the nominal diameter of the welded pipe is 6~150mm, the nominal wall thickness is 2.0~6.0mm, and the length of the welded pipe is usually 4~10m, which can be fixed or doubled. The length of the ruler is factory. The surface quality of the steel pipe should be smooth, and defects such as folding, cracking, delamination and lap welding are not allowed. The surface of the steel pipe is allowed to have slight defects such as scribes, scratches, weld misalignments, burns and crusting that do not exceed the negative wall thickness deviation. Allows thickening of the wall thickness at the weld and the presence of internal weld beads.