LSAW PIPES

Tianjin Lefin Industrial Co., Ltd is one of the most experienced manufacturers and suppliers of lsaw pipes in China. Please feel free to buy high quality lsaw pipes from our factory. Good service and reasonable price are available.

Longitudinally Submerged Arc Welding pipe(abbreviated as LSAW pipe). The Longitudinally Submerged Arc Welding (LSAW) is produced by using a single plate as a raw material, pressing (rolling) the steel plate into a pipe blank in a mold or a molding machine, and adopting double-sided submerged arc welding and expanding the diameter. 

The finished product has a wide range of specifications, and the weld has good toughness, plasticity, uniformity and compactness, and has the advantages of large pipe diameter, thick pipe wall, high pressure resistance, low temperature resistance and corrosion resistance.

When constructing high-strength, high-toughness, high-quality long-distance oil and gas pipelines, most of the required steel pipes are large-diameter thick-walled straight seam submerged arc welded pipes. According to the API standard, in large oil and gas pipelines, the straight seam submerged arc welded pipe is the only designated pipe type when passing through Class 1 and Class 2 areas such as high-altitude zones, seabeds, and urban densely populated areas. According to different molding methods, it can be divided into:

JCOE welded pipe: it is according to the process of "J-C-O-E" pre-welding, forming, cold-expanding after welding;

Main features of LSAW pipe:
1) The steel pipe has a longitudinal weld, and the inner and outer welds are welded by a submerged arc welding.
2) After the overall mechanical 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 is convenient for on-site welding construction.
3) Using the process of pre-weld after-welding, the welding process is stable and the weld quality is high.
4) Welds are easy to achieve non-destructive testing during production and non-destructive testing in the field during use.
5) The product specification range is large, which can produce small diameter, large wall thickness and can also produce large diameter and large wall thickness steel pipe.