The quality of steel pipes is assessed by inspecting the technological properties of seamless or welded steel pipes. Master the test method of steel pipe bending (cold bending) performance and the uation method of steel pipe quality, and use instruments and equipment correctly.

In order to improve the service life of seamless pipes or welded pipes, steel pipe manufacturers often choose to galvanize steel pipes. There are two types of galvanized pipes: 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.

Oxygen blowing pipes are used for steelmaking oxygen blowing pipes. Generally, small-diameter welded steel pipes are used, and the specifications range from 3/8 inch to 2 inch.

Geological pipe is a steel pipe used for core drilling by geological departments. It is a type of seamless pipe. It is a steel pipe with a hollow section and no seams around it. According to the application, it can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe, etc.

Cold-drawn pipe is a kind of steel pipe, that is, it is classified according to different production processes, which is different from hot-rolled (expanded) pipes. It is processed by multi-pass cold drawing in the process of expanding the diameter of the blank or raw tube, usually on a single-chain or double-chain cold drawing machine.

Pipeline transportation engineering Construction of pipelines for transporting oil products, natural gas and solid slurry. Including pipeline line engineering, station depot engineering and pipeline ancillary engineering. In a broad sense, pipeline engineering also includes the supply of equipment and equipment.