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LSAW is a professional term for longitudinally submerged arc welding steel pipes. It is a pipe produced by using a single medium thick plate as raw material, pressing (rolling) the steel plate into a billet in a mold or forming machine, using double-sided submerged arc welding and expanding the diameter.
keyword LSAW Longitudinally Submerged Arc Welding Category Other Related products Get a quoteIntroduction to LSAW submerged arc welded straight seam steel pipe
Definition and Terminology
LSAW is a professional term for longitudinally submerged arc welding steel pipes. It is a pipe produced by using a single medium thick plate as raw material, pressing (rolling) the steel plate into a billet in a mold or forming machine, using double-sided submerged arc welding and expanding the diameter.
application area
oil and gas transmission
When constructing high-strength, 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 API standards, when passing through Class 1 and Class 2 areas such as high-altitude regions, underwater areas, and densely populated urban areas in large oil and gas pipelines, straight seam submerged arc welded pipes are the only designated pipe types. In China, straight seam submerged arc welded pipes are mainly used as a supplement to spiral welded pipes, and are applied to large wall thickness steel pipes (17.5mm or more) and main pipes for bent pipes that cannot be produced by spiral welded pipe units.
Other areas
LSAW submerged arc welded straight seam steel pipes are also used in heavy-duty steel structure engineering, fluid pipeline engineering, and foundation pile engineering in China.
Production process
UOE process
After pre bending at the edge, a single steel plate is produced through processes such as U-forming, O-forming, internal welding, external welding, mechanical or flame cooling expansion.
JCOE process
According to the "J-C-O-E" pre welding, forming, and cold expansion processes after welding. In recent years, progressive JCOE has gradually become another new mainstream technology in China and globally.
HME process
Formed by the core rod rolling method according to "C-C-O", welded and then subjected to cold expansion and other processes.
Product Features
Quality and Performance
Stable quality: The inherent welding quality of submerged arc welding is stable, using a pre welding and precision welding process, resulting in a stable welding process and high weld quality. The weld seam is easy to achieve non-destructive testing during the production process and non-destructive testing re inspection in the field during use.
Uniform stress distribution: 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.
Diverse specifications
The product specification range is large, and it can produce steel pipes with small diameters and large wall thicknesses as well as large diameters and large wall thicknesses. The diameter can reach Φ 406.4- Φ 1422.4mm, and the longest steel pipe can reach 12.2m. At X80 steel grade, the wall thickness can reach 6.4-23.8mm; At X70 steel grade, it can reach 6.4-26.4mm, and the wall thickness can increase to varying degrees when the material is reduced.
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