It is a long steel strip with a hollow section and no seams around it. Steel pipes are hollow sections and are used in large quantities as pipes for the transport of fluids, such as pipes for the transport of petroleum, natural gas, natural gas, water and certain solid materials. Steel pipes have the same bending and torsional strength and are lighter in weight than solid steels such as round steel. It is an economical steel widely used in the manufacture of structural parts and mechanical parts such as oil drill pipes, automobile drive shafts, bicycles. Shelves and steel scaffolding for construction. The use of steel pipe to manufacture ring parts can improve the material utilization rate, simplify the manufacturing process, save materials and processing man-hours, such as rolling bearing rings and jack sleeves, and has been widely used in steel pipes. Steel pipes are also indispensable materials for various conventional weapons, and barrels, barrels, etc. are made of steel pipes. Steel pipes can be divided into round pipes and shaped pipes according to the sectional shape. Since the area of the circle is the largest under equal circumference conditions, the round tube can deliver more fluid. In addition, the circular section is relatively evenly stressed when subjected to internal and external radial pressures, so most of the steel tubes are round tubes.


But the round tube also has certain limitations. For example, in the case of plane bending, the round tube is not as strong as the square tube and the rectangular tube, and some common square tubes and rectangular tubes such as agricultural machinery skeletons and steel wood furniture. Shaped steel pipes of other cross-sectional shapes are also required depending on the application.


1. "Structural Seamless Steel Pipe" (GB/T8162-1999) is a seamless steel pipe for general structural and mechanical structures.
2. "Seamless Steel Pipe for Fluid Transportation" (GB/T8163-1999) is a general-purpose seamless steel pipe that transports fluids such as water, oil and gas.
three. "Seamless Steel Pipe for Medium and Low Pressure Boilers" (GB3087-1999) is used to manufacture superheated steam pipes, boiling water pipes and superheated steam pipes for locomotive boilers, large smoke pipes, small smoke pipes and arch bricks. Hot-rolled and cold-drawn (rolled) seamless steel tubes of high-quality carbon structural steel for pipelines.
4. "Seamless Steel Pipe for High Pressure Boiler" (GB5310-1995) is a high quality carbon steel, alloy steel and stainless steel heat resistant steel seamless steel pipe for the heating surface of high pressure and above water tube boilers.
5. "High-pressure seamless steel pipe for fertilizer equipment" (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines, working temperature -40~400 °C, working pressure 10~30mA .
6. "Seamless Steel Pipe for Petroleum Cracking" (GB9948-88) is a seamless steel pipe suitable for furnace tubes, heat exchangers and pipes of refineries.
7. Geological drilling steel pipe (YB235-70) is a steel pipe used by geological departments for geological drilling. According to the application, it can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe.
8. "Seamless Steel Pipe for Core Drilling" (GB3423-82) is a seamless steel pipe for drill pipe, drill core rod and casing for core drilling.
9. The oil drilling pipe (YB528-65) is a seamless steel pipe used for thickening or external thickening at both ends of oil drilling. There are two kinds of steel pipes, no wire pipe, the wire pipe is connected by joints, and the wireless pipe is welded by butt welding and tool joints.
10. "Carbon Steel Seamless Steel Pipe" (GB5213-85) is a carbon steel seamless steel pipe for the manufacture of marine primary pressure piping systems, secondary pressure piping systems, boilers and superheaters. The working temperature of carbon steel seamless steel pipe wall does not exceed 450 °C, and the working temperature of alloy steel seamless steel pipe wall exceeds 450 °C.
11. "Seamless Steel Pipe for Automotive Semi-Axle Bushing" (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for the production of automobile semi-axle bushings and drive axle shell shaft tubes.
12. "Diesel High Pressure Tubing" (GB3093-2002) is a cold drawn seamless steel pipe for the production of high pressure oil pipes for diesel fuel injection systems.
13. "Precision inner diameter seamless steel pipe for hydraulic pneumatic cylinder" (GB8713-88) is a precision seamless steel pipe for precision inner diameter cold drawn or cold rolling for hydraulic cylinders.