What is the meaning and use of high-pressure seamless steel pipes

High-pressure seamless steel pipes are actually high-pressure boiler steel pipes. Because they are commonly used in high-temperature, high-pressure boilers, they are also called boiler steel pipes. Although the names differ, they are essentially the same type of pipe, and both fall under the category of seamless steel pipes. Their manufacturing process is also similar. However, due to their special working environment, they have very high requirements for material selection. High-pressure seamless steel pipes primarily withstand specific temperatures and pressures of liquids, but the liquids they transport vary. Because of these different applications, the materials used in high-pressure seamless steel pipes will differ. So, what are the specific materials used?

The manufacturing process of seamless steel pipes is divided into hot rolling and cold drawing. Cold drawing further divides pipes into shaped steel pipes and round steel pipes. The same applies to high-pressure seamless steel pipes.

First, what are the steps in the hot rolling process of high-pressure seamless steel pipes?

The overall hot rolling process involves heating a round tube billet to a specific temperature, followed by piercing. The next step is three-roll skew rolling, continuous rolling, or extrusion. This is followed by tube removal, sizing, cooling to form a billet tube, straightening, and finally a hydrostatic test. After marking, it is ready for warehousing.

Second, what are the steps in the cold drawing process for high-pressure seamless steel pipes?

The round tube billet is first heated to a piercing temperature, then pierced. This is followed by heading, annealing, pickling, and copper plating. The next step is cooling, which requires multiple cooling cycles. The resulting billet tube undergoes heat treatment and straightening, and again, a hydrostatic test before being marked and stored.

Third, what are some material details of high-pressure seamless steel pipes?

Because high-pressure seamless steel pipes refer to a class of seamless steel pipes, any steel pipe that can withstand high temperatures and pressures and uses seamless steel pipe manufacturing processes falls under this category. The only differences are in the material and the environments it can withstand.

(1) Seamless steel pipes of model GB5310-2008 are the high-pressure boiler steel pipes mentioned above. However, this type of high-pressure boiler steel pipe is mainly used in boilers within power plants, such as steel pipes resistant to high pressure and high temperature. The materials used for this type of steel pipe are 15CrMoG, 20G, and 12Cr1MoVG.

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

(3) Seamless steel pipes of model GB6479-2000 belong to the category of seamless steel pipes used in high-pressure fertilizer equipment. They are used in fertilizer equipment for transporting high-pressure fluids. The materials used are 16Mn, 12Cr2Mo, 20, and 12CrMo.

(4) Seamless steel pipes of model GB3093-1986 are high-pressure seamless steel pipes specifically designed for use in diesel engines. They are primarily used for high-pressure injection fuel lines within diesel engines and are made of 20A material.

From the above examples of high-pressure seamless steel pipes, it can be seen that they are used in boilers, chemical equipment, and engines. Of course, the materials of high-pressure seamless steel pipes used for different applications are significantly different. Therefore, when using high-pressure seamless steel pipes, please pay attention to the applicable environment of each type of pipe to avoid affecting the service life of the machine.

Fourth, what are the 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 tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes, and arch brick tubes, etc.

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