High-pressure seamless tube is actually a high-pressure boiler tube, because high-pressure seamless tube is usually used in the pipeline of high-temperature and high-pressure boiler, so it is also called boiler tube. Although the above two kinds of pipes have different names, they are actually one kind, belonging to the category of seamless steel pipes, and the manufacturing process is no different from seamless steel pipes. However, due to its special working environment, it requires higher materials. High-pressure seamless pipes mainly bear liquids with certain temperature and pressure, but there are many kinds of liquids to be transported. Because of different uses, the material of high-pressure seamless pipe will be different, but what is the specific material?

We know that the manufacturing process of seamless pipe can be divided into two types: hot rolling and cold drawing, and in the cold drawing process, it can be divided into two types: special-shaped pipe and round pipe, so the same is true for high-pressure seamless pipe.

Hot rolling process steps

The whole process of hot rolling is to heat the round tube blank to a certain temperature and then punch it. The next step is three-roll skew rolling, continuous rolling or extrusion, followed by tube stripping and sizing, followed by cooling to form a blank tube, straightening, and finally, after hydrostatic test, marking and warehousing.

Cold drawing process

Alternatively, the round tube blank is heated to the temperature where it can be perforated, and then the steps of upsetting, annealing, pickling and copper plating are carried out. The next step can be cooling, which requires multiple cooling. The blank tube formed after cooling must be heat-treated and straightened, and can only be marked and put into storage after the same water pressure test.

Introduction of several high-pressure seamless steel pipe materials

Because high-pressure seamless pipe refers to a kind of seamless pipe, as long as it can withstand high temperature and high pressure, pipes using seamless pipe technology belong to high-pressure seamless pipe. Only different materials can adapt to different environments.

GB53 10-2008 seamless steel tube is the above-mentioned high-pressure boiler tube, but this kind of high-pressure boiler tube is mainly used in power station boilers, such as high-pressure and high-temperature resistant tubes, and the materials used for this tube are 15CrMoG, 20G, 12Cr 1MoVG.

GB3087-2008 Seamless Steel Tube belongs to the category of seamless steel tube for medium and low pressure boilers. It is generally believed that this kind of seamless steel pipe is also a kind of high-pressure seamless steel pipe. This kind of steel pipe is mainly used for conveying medium and low pressure fluids in boilers in industry and life. The materials used are 10 and 20 steels.

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

GB3093- 1986 seamless steel pipe is a special high-pressure seamless pipe for diesel engine, which is mainly used for high-pressure injection tubing in diesel engine. The material used is 20A.

As can be seen from the above types of high-pressure seamless pipes, some are used for boilers, some for chemical equipment, and some for engines. Of course, the materials of high-pressure seamless pipes for different purposes are obviously different. Therefore, when using high-pressure seamless pipes, please pay attention to the applicable environment of each pipe so as not to affect the service life of the machine.

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