Section steel is a common metal material that is widely used in construction, manufacturing and other fields. It has excellent strength and durability and plays an important role in a variety of applications.

Galvanized seamless steel pipe, as a pipe with high strength and excellent corrosion resistance, is widely used in many fields such as industry, construction, energy and transportation, and has become an indispensable part of modern engineering materials.

At present, pipelines are mainly used in long-distance oil and gas transportation, and the pipe steel pipes used in long-distance pipelines are mainly spiral submerged arc welded steel pipes and straight seam double-sided submerged arc welded steel pipes. Because the spiral submerged arc welded pipe is made of strip steel, the wall thickness is limited, and the improvement of steel grade is limited by the heat treatment of the material. In addition, the spiral submerged arc welding pipe has some insurmountable shortcomings, such as long weld, large residual stress, and poor reliability of the weld. With the increasing demand for oil and gas conveying steel pipes, they are no longer used in densely populated areas and areas with high reliability requirements, and spiral welded pipes are gradually being replaced by straight seam welded pipes.

First of all, welding method: ordinary welded pipe is mainly made of steel plate as raw material, which is made of bending welding, while high-frequency welded pipe is made of coil plate as raw material, and generally 325-660 caliber steel pipe uses coil plate as raw material.