Introduction of high pressure seamless steel pipe

Introduction of high pressure seamless steel pipe

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

High-pressure seamless pipes are actually high-pressure boiler pipes, because high-pressure seamless pipes are usually used in high-temperature and high-pressure boiler pipes, so they are also called boiler pipes. Although the above two pipes are called differently, they are actually one and the same They all belong to the category of seamless steel pipes, and the manufacturing process is no different from that of seamless steel pipes. However, due to its special working environment, it has high requirements on the materials used. The high-pressure seamless pipe mainly bears a certain temperature and pressure of the liquid, but the liquid to be transported is also divided into various types. Because of different uses, the material of the high-pressure seamless pipe will be different.

The main application of high pressure seamless steel pipe:

① High-pressure seamless steel pipes are mainly used to manufacture water-cooled wall pipes, boiling water pipes, superheated steam pipes, superheated steam pipes for locomotive boilers, large and small smoke pipes, and arch brick pipes.
②High-pressure seamless steel pipes are mainly used to manufacture power plant superheater tubes, reheater tubes, gas guide tubes, and main steam tubes for high-pressure and ultra-high pressure boilers.

Manufacturing steps of high pressure seamless steel pipe:

The production process of seamless tubes is divided into two types: hot rolling and cold drawing, and in the cold drawing process, it is divided into two types of tubes: special-shaped tubes and round tubes, so the same is true for high-pressure seamless tubes.

① Hot rolling process steps

The overall process of hot rolling, the round tube billet is heated to a certain temperature, and then pierced. The next step is the process of three-roll cross rolling, continuous rolling or extrusion, followed by stripping, sizing, and then cooling to form The blank tube is straightened, and after the final hydrostatic test, it can be put into storage after being marked.

②Cold drawing process

Still heat the round tube billet to the temperature that can be pierced, carry out the piercing treatment, and then carry out the steps of heading, annealing, pickling, and copper plating, and then proceed to the cooling treatment in the next step, which needs to be cooled many times, and the billet formed after cooling The pipe also needs to be heat treated and straightened, and it can also be marked for storage after undergoing a hydrostatic test.

Material introduction of high pressure seamless steel pipe:

Because the high-pressure seamless pipe refers to a type of seamless pipe, so in this category, as long as it can withstand high temperature and high pressure, the pipe using the seamless pipe process belongs to the high-pressure seamless pipe. It's just that the material is different, and the environment that can adapt is also different.

GB5310-2008 seamless steel pipe, which is the high-pressure boiler tube mentioned above, but this type of high-pressure boiler tube is mainly used in boilers in power stations, such as high-pressure and high-temperature resistant pipes, etc., this type of high-pressure boiler tube The materials used for the pipeline are 15CrMoG, 20G, 12Cr1MoVG.

The GB3087-2008 seamless steel pipe belongs to the category of low and medium pressure boiler seamless steel pipes. Broadly speaking, this seamless steel pipe is also a high-pressure seamless pipe. This type of steel pipe is mainly used for pipelines for transporting medium and low pressure fluids in industrial and domestic boilers, and the materials used are No. 10 and No. 20 steel.

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

GB3093-1986 seamless steel pipe is a high-pressure seamless pipe specially used in diesel engines, mainly used for high-pressure injection pipes in diesel engines, and the material used is 20A.

From the above high-pressure seamless pipes, it can be seen that they are used in boilers, chemical equipment, and engines. Of course, the materials of high-pressure seamless pipes for different purposes are obviously different, so when using high-pressure seamless pipes, Please pay attention to the applicable environment of each pipeline, so as not to affect the service life of the machine.