As a large class of welded pipes, straight seam steel pipes are made of steel strips, welded by straight seam high-frequency welding technology, and the weld seam is parallel to the steel pipe longitudinally. According to the production process, straight seam steel pipe can be divided into high frequency straight seam steel pipe (ERW pipe) and submerged arc welded straight seam steel pipe (LSAW pipe). After the welding of the straight seam steel pipe is completed, a hydrostatic test will be carried out for water and gas transmission.

Anti-corrosion steel pipe refers to steel pipes that have been processed by anti-corrosion technology, which can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reactions during transportation and use. The substrate of anti-corrosion steel pipe can be seamless pipe, welded steel pipe, etc.

Petroleum tubes are furnace tubes, heat exchangers and seamless steel tubes suitable for petroleum refineries.

Precision tube is a high-precision, high-brightness seamless steel tube produced by cold drawing or cold rolling. Its inner and outer diameters can be accurate to within 0.2mm. While ensuring bending and torsional strength, it is light in weight, so it is widely used in the manufacture of precision mechanical parts and engineering structures. It is also commonly used to produce various conventional weapons, barrels, shells, bearings, etc.

The so-called carbon steel pipe actually refers to the fact that the mechanical properties depend on the carbon content in the steel pipe. Generally, steel pipes that do not add a large amount of alloy elements are also called ordinary carbon steel pipes or carbon steel pipes, which refer to iron-carbon alloy pipes with a carbon content of less than 2%. In addition to carbon, carbon steel pipes also contain a small amount of silicon, manganese, sulfur and phosphorus.

Oil casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire oil well after the drilling process and completion. Each well uses several layers of casing according to different drilling depths and geological conditions. Cement cementing is used after the casing is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes.