Welded steel pipe, also known as welded pipe, is a steel pipe made of steel or steel strip after being pressed and formed， It is generally 6 meters long. The production process of welded steel pipes is simple, with high production efficiency and variety specifications More, less equipment investment, but generally lower in strength than seamless steel pipes.

MS erw pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, electric power, agricultural irrigation, urban construction, etc. 

Used for liquid transportation: water supply and drainage. Used for gas transportation: gas, steam, liquefied petroleum gas. 

For structural purposes: as pile pipes and bridges; Pipelines for docks, roads, and building structures.