The process on manufacturing welded steel pipe is complicated. Starting from the steel billet with solid and round feature, then turn to increase the temperature and make it flexible until we can hollow this billet into a tube

The delivery pressure of pipeline medium has a tendency to increased gradually, particularly evident in the pipeline online. This is because in a certain range to improve delivery pressure will increase the economic benefits to gas lines, for example, the amount of change in the input conditions, the gas is increased as the delivery pressure increases the density of the flow decreases, so that the friction decreased.

Oil pipeline is the main components of the oil wells, the cost of accounting for oil well development and production costs 20% to 30%, while oil casing usually accounts for 73% to 76% of the entire oil pipe consumption.

Construction or industrial road traction is generally reinforced by former or wire straightening machine, mainly for steel pre-cut path to improve the surface quality.

Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base. The process of galvanizing sheet iron was developed simultaneously in France and England in 1837. Both of these methods employed a "hot dipping" process to coat sheet iron with zinc. Like tinplate, early galvanized metals were hand dipped. Today almost all galvanized iron and steel is electroplated.

Steel pipe is the most commonly and widely used in the gas project field. Its main advantages are: high strength, good toughness, bearing stress, impact resistance and rigor, good plasticity, ease of welding and thermal processing, thin wall thickness, to save metal.

Oil pipeline usually been in running from within and outside environmental corrosion, internal corrosion mainly by the transmission medium, pipe joint effusion, dirt and pipeline stress formed; external corrosion is usually due to failure of the coating, failure to produce.

In steel pipe manufacturing standards, steel pipe can be divided into the structure steel pipes and fluid transport. Structural steel is mainly used for general metal structures such as bridges, steel frame, the only requirements to ensure the strength and rigidity of steel pipe rigor required.

Socket welding generally insert pipe into flanges for welding, butt welding uses butt welding flange to welding pipe and butt face, socket weld radiography is not possible, butt welding can, so for weld testing requirements highly recommended butt welding flange.

Thermal expansion seamless steel pipe deformation zone is divided into three parts: the flattening reducing region, reducing zone, turn round area.

Round billet used in the production of seamless steel tubes of different caliber. Seamless steel pipe production round billet while rotating propulsion and perforation, round billet is inclined to rely on two rollers to rotate the rod core end plug.

Using ultrasonic testing to detect the quality of seamless steel pipe can be done defects (corrosion, cracks, pits, etc.) is detected without damaging the pipe.