ERW steel tube and seamless steel tube billet quality difference

　　Tube billet is the key raw material in manufacturing process, is the solid round bar of steel used to produce many pipe products.

　　ERW steel pipe is manufactured by cold forming the steel coil into a round cylindrical pipe. Current passes between the two edges of the steel to heat the steel to a point at which the edges are able to connect together to form a bond using the actual welding process. ERW is normally used to transport liquid, such as petrol and gas, playing a significant role in the world line pipe transporting area.

　　Seamless steel pipe (also called SMLS) refers to a hollow steel pipe having no seam around. Due to its unique feature of strength and anti-bending, seamless pipe is widely used in construction, oil refining and chemical industries.

　　The ERW pipe tube billet is made of hot-rolled steel strip with cold rolling process while the seamless pipe tube billet is produced in hot rolling condition. The situation where seamless pipe tube billet is produced has some negative effects on the grain size, thus resulting in a less satisfying performance. Compared with seamless pipes, the chemical structure of the tube billet of ERW pipe has more advantages. The processing method such as desulfurization, dephosphorization and degassing makes the purity of ERW pipe billet much higher. The adding-in of specific chemical elements improves the toughness and the strength of the tube billet.

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