Seamless pipe is a kind of long steel with hollow section and no joints around. In total, there are more than 5100 production plants under more than 1850 companies in more than 110 countries producing seamless pipes in the world, including more than 260 plants under more than 170 companies in 44 countries producing oil pipes.
Stainless steel seamless pipe has three main characteristics: first, the thicker the wall thickness of the product, the more economical and practical it will be. The thinner the wall thickness, the higher its processing cost will be; Second, the process of this product determines its limited performance. Generally, the precision of seamless steel pipe is low: uneven wall thickness, low brightness of the inner and outer surface of the pipe, high sizing cost, and pockmarks and black spots on the inner and outer surface are not easy to remove; Third, its detection and shaping must be handled offline. Therefore, it embodies its advantages in high pressure, high strength and mechanical structure materials.
Steel pipe is a kind of long steel with hollow section and no joints around. Steel pipes have hollow sections and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when its bending and torsional strength is the same. It is a kind of economic section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolds used in construction.
Using steel pipes to make annular parts can improve the utilization rate of materials, simplify the manufacturing process, and save materials and processing hours, such as rolling bearing rings, Jack sleeves, etc. steel pipes have been widely used to manufacture. Steel pipe is also an indispensable material for all kinds of conventional weapons. The barrel and barrel of the gun should be made of steel pipe. Steel pipes can be divided into round pipes and special-shaped pipes according to the shape of cross-sectional area. Because the circular area is the largest under the condition of equal perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, the vast majority of steel pipes are round pipes.
However, circular pipes also have certain limitations. For example, under the condition of plane bending, the bending strength of circular pipes is not as strong as that of square and rectangular pipes. Square and rectangular pipes are commonly used in the framework of some agricultural machines and tools, steel and wood furniture, etc. Special shaped steel pipes with other cross-section shapes are also required according to different uses.
Post time: Jul-22-2022