Seamless steel pipes
and welded pipes
are mainly formed by different molding processes. Ordinary steel pipes, such as tap water pipes, are usually welded by bending the flat plate. You can find a weld on the top; the coarser diameter is usually a spiral weld. The seamless steel pipe is generally formed by laminating molten steel in a molten state through a ring slit and then being subjected to a stretching process, so that there is no weld.
In terms of performance, especially the pressure bearing capacity is greatly improved compared with ordinary steel pipes, so it is often used on high-voltage equipment. Such as the piping connection of hydraulic equipment. The weld joint of ordinary steel pipe is its weak link, and the weld quality is also the main factor affecting its overall performance. People who have lived in the north generally have experienced the experience of freezing water pipes or heating pipes in the winter. The places where the explosions are usually welded.
The way to distinguish between the two is to watch for any weld marks on the ports. If it is a seamless pipe port, it can be seen that there is no weld meat inside and outside the pipe, and even if the welded pipe is welded for machining, the weld in the pipe is easy to observe. If there is a weld in the fracture part of the pipe, whether it is inside or outside the pipe, it is a welded pipe.
The seamless tube is a long strip of steel with a hollow section and no seams around it. A seamed pipe is generally a steel plate rolled into a cylinder for welding. The alloy tube is a kind of seamless steel tube, and the alloy tube is divided into a structural seamless tube and a high-pressure heat-resistant alloy tube. Mainly different from the production standard of alloy tube and its industry, the alloy tube is annealed and tempered to change its mechanical properties. Achieve the required processing conditions.
The performance of the seamless steel pipe is higher than that of the general seamless steel pipe. The chemical composition of the alloy pipe contains more Cr, high temperature resistance, low temperature resistance and corrosion resistance.The carbon seamless pipe contains no alloy composition or few alloy components. The reason why the alloy pipe is widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries is because the mechanical properties of the alloy pipe are changed and adjusted.