Introduction to materials and process steps of high-pressure seamless steel pipes

High-pressure seamless steel pipes are high-pressure boiler steel pipes. Because high-pressure seamless steel pipes are usually used in pipes of high-temperature and high-pressure boilers, they are also called boiler steel pipes. Although the above two pipes are called differently, they are the same and both belong to the category of seamless steel pipes. The manufacturing process is no different from that of seamless steel pipes. However, due to its special working environment, it has high requirements for materials. High-pressure seamless steel pipes are mainly used to bear a certain temperature and pressure of liquids, but the liquids transported are also divided into many types. Because of different uses, the materials of high-pressure seamless steel pipes will be different, but what are the specific materials?

The manufacturing process of seamless steel pipes is divided into hot rolling and cold drawing, and in the cold drawing process, they are divided into two types of pipes: special-shaped pipes and round pipes, so the same is true for high-pressure seamless steel pipes.

Hot rolling process steps: The overall process of hot rolling is to heat the round tube billet to a certain temperature, and then perform perforation treatment. The next step is three-roller oblique rolling, continuous rolling or extrusion process, followed by tube removal, sizing, cooling to form a billet tube, straightening, and finally water pressure test, marking, and storage.

The cold drawing process: The round tube billet is still heated to a perforated temperature, perforated, and then headed, annealed, pickled, and copper-plated. The next step is cooling treatment. It needs to be cooled multiple times. The billet tube formed after cooling must also be heat-treated and straightened. It can also be marked and stored after a water pressure test.

Introduction to some materials of high-pressure seamless steel pipes
Because high-pressure seamless steel pipes refer to a type of seamless steel pipes, in this category, as long as they can withstand high temperature and high pressure, and use seamless steel pipe technology, they are all high-pressure seamless steel pipes. It's just that the materials are different and the environments they can adapt to are also different.
1. GB5310-2008 seamless steel pipe, which is the high-pressure boiler pipe mentioned above, but this type of high-pressure boiler pipe is mainly used in boilers in power stations, such as high-pressure and high-temperature resistant pipes, etc. The materials used for this type of pipe are 15CrMoG, 20G, and 12Cr1MoVG.
2. GB3087-2008 seamless steel pipe belongs to the category of low- and medium-pressure boiler seamless steel pipes. Generally speaking, this seamless steel pipe is also a high-pressure seamless steel pipe. This type of steel pipe is mainly used for some pipelines for transporting medium and low-pressure fluids in boilers in industry and life, and the materials used are 10 and 20 steel.
3. GB6479-2000 seamless steel pipe belongs to the seamless steel pipe used in high-pressure fertilizer equipment, that is, the part of fertilizer equipment that needs to transport high-pressure fluids, and the materials used are 16Mn, 12Cr2Mo, 20, and 12CrMo.
4. GB3093-1986 seamless steel pipe is a high-pressure seamless steel pipe specially used in diesel engines. It is mainly used for high-pressure injection oil pipes inside diesel engines. The material used is 20A.

From the above several high-pressure seamless steel pipes, are used in boilers, some are used in chemical equipment, and some are used in engines. Of course, the materials of high-pressure seamless steel pipes for different purposes are different. Therefore, when using high-pressure seamless steel pipes, please pay attention to the applicable environment of each pipe to avoid affecting the service life of the machine.