High-pressure seamless steel pipes are high-pressure boiler pipes because high-pressure seamless steel 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 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 for the materials used. The high-pressure seamless steel pipe mainly bears a certain temperature and pressure of the liquid, but the transported liquid is also divided into various types. Because of different uses, the material of the high-pressure seamless steel pipe will be different, but what are the specific materials?
The production process of seamless steel pipes is divided into two types: hot rolling and cold drawing, and the cold drawing process, is divided into two types of pipes: special-shaped pipes and round pipes, so the same is true for high-pressure seamless pipes.
Process steps of hot rolled seamless steel pipe:
Hot rolling process: the round tube billet is heated to a certain temperature, and then pierced. The next step is a three-roll cross-rolling, continuous rolling or extrusion process, followed by tube removal, sizing, and then cooling to form a billet tube, straightening, and finally after the hydrostatic test, mark it and put it into storage.
The process steps of cold-drawn seamless steel pipe: still heat the round tube billet to the temperature that can be pierced, and then carry out the piercing treatment, and then carry out the steps of heading, annealing, pickling, copper plating, and then cooling treatment in the next step. After the second cooling, the billet tube formed after cooling must be heat treated and straightened, and it can be marked and put into storage after the same water pressure test.
Introduction of some materials 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.
Post time: Aug-03-2023