Seamless Steel Pipe is a type of steel pipe with uniform inner and outer diameters and consistent wall thickness, which is processed by a piercing machine from a solid cylindrical billet. It has advantages such as no welded joints and excellent mechanical properties compared to welded steel pipes. It is commonly used in pipeline transportation systems under high pressure, high temperature, low temperature, and corrosive environments. Common seamless steel pipe materials include carbon, alloy, and stainless steel.