What Is The Difference Between Welded Steel Pipe And Seamless Steel Pipe？

Welded pipe, also known as welded steel pipe, is a steel pipe that has been crimped and welded from steel plate or strip steel. Welded steel pipe has a simple production process, high production efficiency, many varieties and specifications, and less equipment than seamless steel pipes, but its overall strength is lower. Since the 1930s, with the rapid development of continuous rolling production of high-quality strip steel and the advancement of welding and inspection technology, weld quality has been continuously improved, the varieties and specifications of welded steel pipes have grown, and seamless steel pipe has been replaced in an increasing number of fields. Welded steel pipe is classified as straight seam welded pipe or spiral welded pipe based on the shape of the weld.

1. Welded pipe classification

Welded pipes are classified by use: general welded pipes, galvanized welded pipes, oxygen-blown welded pipes, wire casings, metric welded pipes, roller pipes, deep well pump pipes, automobile pipes, transformer pipes, electric welding thin-walled pipes, and electric welding pipes. Spiral welded pipes and shaped pipes

2. The application range of welded pipes

Welded pipe products are commonly found in boilers, automobiles, ships, light structure doors and windows steel, furniture, various agricultural machinery, scaffolding, wire threading pipes, high-rise shelves, containers, and other applications.

The seamless steel pipe is made of perforated whole round steel, and it is a steel pipe with no weld seam on the surface. Seamless steel pipe is classified into four types based on its manufacturing method: hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, and pipe jacking. The seamless steel pipe is classified into two types based on its cross-sectional shape: round and special-shaped. The maximum and minimum diameters are 900mm and 4mm, respectively. There are two types of seamless steel pipe: thick-walled seamless steel pipe and thin-walled seamless steel pipe. Seamless steel pipes are primarily used as petroleum geological drilling pipes, petrochemical cracking pipes, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.