Specific details of high-pressure seamless steel pipes

First, a brief introduction to high-pressure seamless steel pipes

High-pressure seamless steel pipes and high-pressure boiler pipes are a type of boiler pipe and belong to the category of seamless steel pipes. The manufacturing method is the same as that of seamless steel pipes, but there are strict requirements on the type of steel used to manufacture steel pipes. High-pressure boiler pipes are often in high-temperature and high-pressure conditions when used. High-pressure boiler pipes are mainly used to manufacture superheater pipes, reheater pipes, gas guide pipes, main steam pipes, etc. of high-pressure and ultra-high-pressure boilers.

Second, introduction to the material and process steps of high-pressure seamless steel pipes

High-pressure seamless steel pipes are high-pressure boiler pipes. Because high-pressure seamless steel pipes are usually used in pipes of high-temperature and high-pressure boilers, they are also called boiler pipes. Although the above two pipes are called differently, they are one 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 the materials used. 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 the cold drawing process is divided into two types of steel pipes: special-shaped steel pipes and round steel pipes. Therefore, the same is true for high-pressure seamless steel pipes.

1) Steps of the hot rolling process of high-pressure seamless steel pipes: In the overall process of hot rolling, the round tube billet is heated to a certain temperature and then pierced. The next step is a three-roller oblique rolling, continuous rolling, or extrusion process, followed by tube removal, sizing, and then cooling to form a billet tube, straightening, and finally after a water pressure test, it can be marked and put into storage.

2) Steps of cold drawing process of high-pressure seamless steel pipes: the round tube billet is heated to a temperature that can be pierced, and then pierced. After that, the steps of heading, annealing, pickling, and copper plating are performed. The next step is cooling. 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 put into storage after a water pressure test.

3) 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 all belong to 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 pipes, which are the high-pressure boiler pipes 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 pipes belong to the category of low- and medium-pressure boiler seamless steel pipes. Broadly speaking, this seamless steel pipe is also a high-pressure seamless steel pipe. This type of steel pipe is mainly used for pipelines for transporting medium and low-pressure fluids in boilers in industry and life, and the materials used are 10 and 20 steels.

③ GB6479-2000 seamless steel pipe belongs to the seamless steel pipe used in high-pressure fertilizer equipment, which is part of the fertilizer equipment that needs to transport high-pressure fluid. The materials used are 16Mn, 12Cr2Mo, 20, 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.

Third, the main uses of high-pressure seamless steel pipes

① High-pressure seamless steel pipes are mainly used to manufacture water-cooled wall tubes, boiling water tubes, superheated steam pipes, superheated steam pipes for locomotive boilers, large and small smoke pipes, arch brick pipes, etc.

② High-pressure seamless steel pipes are mainly used to manufacture power plant superheater tubes, reheater tubes, gas guide tubes, main steam pipes, etc. for high-pressure and ultra-high-pressure boilers.