螺旋管也称螺旋钢管或螺旋焊管，是将低碳素结构钢或低合金结构钢钢带按一定的螺旋线的角度（叫成型角）卷成管坯，然后将管缝焊接起来制成的，它可以用较窄的带钢生产大直径的钢管。
螺旋管特点：直缝焊管生产工艺简单，生产效率高，成本低，发展较快。螺旋焊管的强度一般比直缝焊管高，能用较窄的坯料生产管径较大的焊管，还可以用同样宽度的坯料生产管径不同的焊管。但是与相同长度的直缝管相比，焊缝长度增加30~100%，而且生产速度较低。因此，较小口径的焊管大都采用直缝焊，大口径焊管则大多采用螺旋焊。
Spiral tubes, also known as spiral steel pipes or spiral welding tubes, are made by rolling steel strips of low-carbon steel or low-alloy steel belts into billets at a certain spiral angle(called a forming angle) and then welding the pipes., It can produce large-diameter steel pipes with narrow strip steel.
Spiral tube characteristics: straight joint welding pipe production process is simple, high production efficiency, low cost, rapid development. The strength of spiral welded tubes is generally higher than that of straight welded tubes, and pipes with larger diameter can be produced with narrower billets, and tubes with different diameter of tubes can also be produced with billets of the same width. However, the weld length increases by 30 ~ 100 % and the production speed is lower than that of the same length straight seam tube. Therefore, most of the smaller caliber welded tubes are welded straight, and most of the large-caliber welded tubes are spiral welding.
