The Wall thickness of seamless steel pipe is relatively thick, relatively small diameter thick. But the diameter is restricted, its applications are limited, and production costs, especially for large-diameter seamless steel pipe production costs are relatively high.

2, high-frequency welded steel pipe

High-frequency welded tubular good, uniform thickness, internal and external burrs generated by the welding tool Calibrating the appropriate online through strict control of non-destructive testing of weld quality, high degree of automation, low production costs. But relatively thin wall thickness, diameter is relatively small, usually no more than a wall thickness of 12mm, and a diameter of not more than 610mm, is particularly suitable for the production of steel tube truss structures.

3, LSAW steel pipe

LSAW pipe using + double submerged arc welding process, welding under static conditions, high weld quality, short weld defects is very small probability. Expanding through full-length steel tubular goods, precise size, a wide range of pipe wall thickness and diameter range, the diameter range up to 406-1829mm, wall thickness range up 6.0-60mm, high degree of automation, and seamless Compared to steel, lower production costs, for buildings, bridges, dams, offshore platforms and other steel bearing with pillars, large span structures as well as wind and seismic requirements for electrical tower masts structure.

4, Spiral submerged arc welded pipe

SSAW spiral weld line distribution, long welds, especially under dynamic conditions in welding, the weld had a chance to cool down on the left molding point, easy to produce welding hot cracking.