Difference Between Seamless Steel Pipe And Welded Steel Pipe

Common steel pipes are mainly in the form of welded steel pipes and seamless steel pipes. During the construction process, suitable steel pipes will be selected in accordance with the specific construction conditions, and cost is the primary factor. Therefore, this paper identifies the welded steel pipe and seamless steel pipe from the aspects of steel pipe performance, technology and identification methods, hoping to provide reference for the choice of steel pipe in the construction process.

With the continuous progress of science and technology, China's steel pipe production technology has also been significantly improved. At present, there are mainly two forms of common steel pipes, which are weld steel pipe and seamless steel pipe. Because the cost of welded steel pipes is significantly lower than that of seamless steel pipes, some businesses process welded steel pipes in order to obtain more economic benefits, and then impersonate seamless steel pipes, and then flow them into the market for sales, causing market confusion. Looking at the processed welded steel pipe from the outside cannot be effectively identified. Once in the construction process of the project, the seamless steel pipe should be used but the welded steel pipe will be used, which will cause gas or liquid leakage. In severe cases, it is easy to cause an explosion, so it is necessary to distinguish the welding Steel pipe and seamless steel pipe to ensure the engineering quality.

Steel Seamless Pipe

Generally, a welded steel pipe is formed by turning a steel strip or a steel plate into a circle or a square under the action of an external force, and then welding the surface seams to form a welded steel pipe. The commonly used processes are arc welding, high frequency or low frequency, cold rolling, etc. However, welding using these processes will lead to weld seams in steel pipes. At present, according to the shape of the weld seam, it can be divided into straight seam and spiral welded steel pipes, but the processes used are different. Spiral steel pipe is welded by submerged arc welding. This welding method has the advantages of high welding efficiency and less dust. For high-frequency or low-frequency welding, it is mainly based on the principle of electromagnetic induction. Due to the proximity and turbine thermal effects of AC charges in the conductor, the steel at the edge of the weld can be molten and the welding can be completed.

Carbon steel seamless pipe is mainly formed by perforating solid pipe billets or steel ingots into capillaries, and then processing them by hot rolling, cold rolling, and cold drawing to form seamless steel pipes. Since the seamless steel pipe has a hollow section, this hollow section can be used as a pipeline for transmitting fluids.