High-pressure seamless steel pipes, also known as high-pressure boiler tubes, are commonly used in high-temperature and high-pressure environments, particularly in the piping systems of boilers. Though they may be referred to by different names depending on the context, they both fall under the category of seamless steel pipes and are produced using the same manufacturing processes.
Due to the demanding working conditions of high-pressure seamless pipes, the materials used must meet stringent requirements. These pipes are primarily designed to withstand the high temperature and pressure of liquids, which vary depending on the application. As a result, different materials are used for different types of high-pressure seamless pipes. Below is an overview of the key materials and their applications.
Materials of High-Pressure Seamless Steel Pipes
High-pressure seamless steel pipes are categorized based on their ability to endure high temperatures and pressures. These pipes are made from various materials, depending on the specific requirements of the environment they will be used in:
- GB5310-2008 Seamless Steel Pipe
This type of high-pressure boiler tube is mainly used in power station boilers, designed to handle high temperatures and pressures. The materials used for these pipes include:
15CrMoG
20G
12Cr1MoVG
- GB3087-2008 Seamless Steel Pipe
Although primarily categorized as a low- and medium-pressure boiler pipe, this type is also used in high-pressure environments. It is commonly used for transporting medium- and low-pressure fluids in industrial boilers and domestic systems. The materials used for this type include:
10 steel
20 steel
- GB6479-2000 Seamless Steel Pipe
This pipe is specifically designed for high-pressure fertilizer equipment. It is used in sections of fertilizer equipment that need to transport high-pressure fluids. The materials used for these pipes include:
16Mn
12Cr2Mo
20
12CrMo
- GB3093-1986 Seamless Steel Pipe
This pipe is tailored for high-pressure applications in diesel engines, specifically used for high-pressure injection oil pipes inside diesel engines. The material used is:
20A
Manufacturing Process of High-Pressure Seamless Steel Pipes
The production of high-pressure seamless pipes follows a two-step process: hot rolling and cold drawing. Each process involves specific steps depending on the type of pipe being produced.
- Hot Rolling Process
The hot rolling process begins by heating the round tube billet to a specific temperature, followed by perforation treatment. The pipe then undergoes one of the following processes:
Three-roller oblique rolling
Continuous rolling
Extrusion process
Afterward, the pipe undergoes sizing, cooling, straightening, and a water pressure test. The pipe is then marked and stored.
- Cold Drawing Process
In the cold drawing process, the round tube billet is heated to a perforation temperature before being perforated. The tube then undergoes heading, annealing, pickling, and copper-plating. After these steps, the billet is cooled multiple times. The pipe is heat-treated and straightened before being marked and stored. A water pressure test is also conducted to ensure the pipe’s integrity.
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
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