Longitudinal Welded Pipe

Longitudinal welded pipe,also known as straight seam welded steel pipe,is one of the most commonly used welded steel pipe products in global pipeline engineering.It is manufactured by rolling carbon steel coils into cylindrical shape,and then welding along the longitudinal seam of the steel strip through high-frequency electric resistance welding,submerged arc welding or other mature welding technologies.Compared with spiral welded pipe,its straight weld structure brings more stable mechanical performance and simpler production process.

During production,high-quality steel coils are first leveled,sheared and formed into tubular shape.After precise welding and seam treatment,the pipe body undergoes flattening,sizing,straightening,flaw detection and pressure testing procedures.The finished pipe features uniform wall thickness,round cross-section and reliable weld quality.Advanced post-processing including heat treatment effectively eliminates welding stress,improving overall structural strength and toughness.

This type of steel pipe owns excellent mechanical properties such as high compressive strength,good impact resistance and strong structural stability.Its straight weld seam is compact and reliable,with low risk of weld leakage under normal working pressure.With customizable diameter,wall thickness and length specifications,longitudinal welded pipe can be further processed into anti-corrosion finished products,including epoxy coated pipe and plastic coated composite pipe,to adapt to harsh working environments.

It is widely applied in municipal water supply and drainage,natural gas transmission,petroleum pipeline engineering,construction structure,fluid transportation,fire pipeline system and general industrial pipelines.With reasonable production cost,convenient connection methods and stable service performance,longitudinal welded pipe has become a cost-effective basic pipeline material.It supports flange connection,groove connection and welding construction,and provides long-term safe operation for various infrastructure projects.