LSAW steel pipe diameter in the range between 406 ~ 1600mm, in exceptional cases even more, the ratio of wall thickness and diameter of about 0.06 to 0.08. Modern foreign technology can produce pipe up to 100mm wall thickness of pipe.
Industrial production of steel plate or DSAW steel pipe only a few ways, the principle difference is the method of forming steel pipe, steel pipe after forming the follow-up process is basically the same. The method of welding forming depends on the distribution of steel, according to the distribution of pipe, welding two basic forms: straight seam and spiral welded pipe. Corresponding to this, straight seam welded pipe production into the production and the production of spiral seam pipe. Straight seam and spiral seam steel pipe the most widely used method is submerged arc welding (SAW), its good quality, high productivity, technology is mature and stable. At present, the LSAW steel pipe is widely distributed as follows: air, land and sea transport, water and oil main pipeline; Stainless steel tubes transport chemicals and chemical products; The structure of Marine industry; Tube structure for boiler manufacturing.
