Chinas steel pipe classification standards
Steel pipes are a type of metal component used in industrial, automotive, engineering and construction applications. In China, steel pipes have been classified according to national standards. This classification system standardizes the product categorization into steel pipes, welded pipes, seamless pipes, and all other types of large-diameter steel pipes. The standard also stipulates the metric performance parameters of each type of steel pipe.
The China standard 5L, 10L, 20L, and 30L is most commonly used in steel pipes. Five level (5L) pipes are used in applications involving air pressure, gas pressure, liquid pressure and steam; 10L is typically used for air pressure, gas, and liquid pressure; 20L is suitable for applications involving liquid and vapor pressure; 30L is used for applications in low-pressure and non-pressure applications.
The strength grade, shape, size, manufacturing process, and application of each type of steel pipes are determined by the specific application requirements of the pipe. The grade of steel is designated by a combination of letters indicating the grade of material used for construction, which may include carbon steel (A or B); stainless steel (S); or alloy steel (G).
The shape and size of the steel pipe also vary according to application. For example, pipes that are designed to be used in a high pressure situation must be strong and capable of resisting high pressures. Similarly a pipe designed to transport liquids must be oval or circular in shape, and must look streamlined and resistant to the flow of the liquid.
The manufacturing process of steel pipes also varies depending on application. Pipe used in high pressure systems and applications is commonly created using hot rolling, cold drawing or electric resistance welding. On the other hand, pipes used in low-pressure applications are usually made using extrusion or draw-bending production.
The application of each steel pipe is also categorized by the China standard. Some pipes are made for pressure applications, such as in the pipeline system for the transportation of oil or gas; others are for mechanical applications, such as the roof of a building or parts of an automobile; still .others may be part of a heat transfer system, such as in a central heating system.
In China, all types of steel pipes are strongly regulated to meet the national standards. The China standard also defines the properties of each type of steel pipe, such as strength and grade of material used in construction, which helps to ensure that the pipe meets the specified application requirements.
Overall, steel pipes are essential components in the construction, engineering, and automotive industries. They are also required in many other sectors, including those in the energy, telecommunications, and agricultural industries. In China, they are classified according to national standards and categorized into steel pipes, welded pipes, seamless pipes and all other types of large-diameter steel pipes. With the China standard, each type of steel pipe application, strength grade, shape, size, manufacturing process, and application are being carefully monitored and regulated for the highest performance and quality.
