Submerged arc welding is a welding method in which an arc burns under a layer of flux. Its inherent advantages such as stable welding quality, high welding productivity, no arc light and little smoke make it the main welding method in the manufacture of important steel structures such as pressure vessels, pipe section manufacturing (such as SSAW pipe and LSAW pipe), and box-shaped beams and columns.

Some seamless steel pipes need shrinking and flaring to produce products. The shrinking and flaring of seamless steel pipes is a forming process in which the mouth of the pre-formed steel pipe is reduced and enlarged through the shrinking and flaring dies.

Galvanized pipes are divided into two types: hot-dip galvanizing and electric galvanizing. Hot-dip galvanizing has a thick galvanized layer, which has the advantages of uniform coating, strong adhesion, and long service life. The cost of electro-galvanizing is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipes.

The drill pipe is a steel pipe with threads at the end, which is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or the bottom hole device at the bottom of the drilling well.

Petroleum cracking seamless steel pipe is a seamless steel pipe suitable for pressure pipelines such as petroleum and chemical furnace tubes, refining and chemical equipment, cracking equipment, hydrogenation equipment, and heat exchangers.

Pressure piping refers to all piping subjected to internal or external pressure, regardless of the medium in the pipe. A pressure pipe is a part of a pipeline that is used to convey, distribute, mix, separate, discharge, meter, control and stop fluid flow. An assembly consisting of pipes, fittings, flanges, bolted connections, gaskets, valves, other components or pressure parts and supports.