High-frequency welded pipes are generally completed through processes such as cold rolling, high-frequency welding, and forming. It is a kind of seamed tube.
Seamless steel pipes are divided into hot-rolled seamless pipes and cold-drawn seamless pipes. Hot-rolled pipes are forged, pierced, rolled, and shaped. Generally, large-diameter and thick-walled seamless pipes adopt this form; cold-drawn pipes are formed by cold-drawn pipe blanks, with relatively low material strength and smooth appearance and internal control surfaces. Small-caliber, thin-walled seamless pipes are mostly of this kind.
Seamless steel pipe is a long steel with a hollow section and no joints on the periphery. The steel pipe has a hollow section and is used as a pipeline for conveying fluids.
High-frequency welded pipe is cold-pressed into a square tube with a certain width of steel strip, and then welded by high-frequency welding. It is generally made by cold rolling. The surface of the hot-rolled plate is rough, oxides, and thickness tolerances are not allowed. The seamless tube is heated by the steel billet, passed through with a hard rod, and extruded with a rolling roller on the outside. It is suitable for high pressure and high temperature conveying fluid. High frequency welded pipes are generally passed through, cold rolling, high frequency welding, forming, etc. The process is complete. It is a kind of seamed tube.
Large diameter hot rolled seamless pipe
Seamless steel pipes are divided into hot-rolled seamless pipes and cold-drawn seamless pipes. Hot-rolled pipes are forged, pierced, rolled, and shaped. Generally, large-diameter and thick-walled seamless pipes adopt this form; cold-drawn pipes are formed by cold-drawn pipe blanks, with relatively low material strength and smooth appearance and internal control surfaces. Small-caliber, thin-walled seamless pipes are mostly this kind.
