LSAW steel pipe (Longitudinally Submerged Arc Welding) is a professional expression term for straight seam submerged arc welded steel pipe, which is made of a single medium and thick plate as raw material, the steel plate is pressed (rolled) into a pipe blank in a mold or forming machine, and the pipe is produced by double-sided submerged arc welding and diameter expansion.

LSAW steel pipe weld has good toughness, plasticity, uniformity and compactness, and has the advantages of large pipe diameter, pipe wall thickness, high pressure resistance, low temperature resistance and strong corrosion resistance. In the construction of high-strength, high-quality long-distance oil and gas pipelines, most of the steel pipes required are large-diameter thick-walled straight seam submerged arc welded pipes.

Main features of LSAW steel pipe:

1) The steel pipe has a longitudinal weld, and the inner and outer welds are welded by a submerged arc weld.

2) After the overall mechanical diameter expansion treatment, the internal stress of the steel pipe is small and evenly distributed, which can effectively prevent stress corrosion cracking, high dimensional accuracy, and convenient for on-site welding construction.

3) The process of fine welding after pre-welding is adopted, the welding process is stable and the weld quality is high.

4) The weld is easy to realize non-destructive testing in the production process and non-destructive testing review in the field during use.

5) The product specification range is large, which can produce steel pipes with small diameter and large wall thickness as well as large diameter and large wall thickness.