Seam pipe refers to the strip or plate bending round, square and other shapes and then welded into the surface jointed pipe. Slotted pipe with blank steel plates or steel strip.

With the development of high-quality steel rolling production as well as the rapid development of welding and inspection techniques, and improved quality of welds,

pipe has increasing varieties and specifications, and take the place of seamless steel pipe in some areas. Compare to seamless steel pipe, seam pipe have some advantages, less cost, high production and efficiency.

According to different welding methods, can be divided arc welded pipe, high-frequency or low frequency electric resistance welded pipe, gas pipe, stove pipe, Bundy tubes.

According to seam shape, can be divided into longitudinal and spiral welded pipe.

According to the end-use, can be divided in to general welded pipe, galvanized pipe, oxygen blowing pipe, wire casing, metric pipe, roller tube, deep well pump tube, automotive tube, transformer tube, welding thin-walled tube, welding shaped tube and spiral welded pipe.

According to the end of the shape,  can be divided into circular pipe and shaped (square, flat, etc.) pipe.