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Common steel pipes mainly include welded steel tubes and seamless pipes. In the process of engineering construction, appropriate steel pipes will be selected according to specific construction conditions, and cost will be the primary factor.
Welded steel pipes are generally formed by deforming steel strips or steel plates into round or square shapes under the action of external force, and then welding the seams on the surface to form welded steel pipes. Commonly used processes include arc welding, high frequency or low frequency, cold rolling, etc., but welding with these processes will result in welded seams in steel pipes. At present, according to the shape of the weld, it can be divided into straight seam and spiral welded steel pipe, but the processes used by the two are different. The spiral steel pipe is welded by submerged arc welding, which 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 heating effect of the AC charge in the conductor, it is possible to achieve the molten state of the steel at the edge of the weld and finally complete the welding.
The seamless steel pipe is mainly to perforate the solid tube billet or steel ingot to make a capillary pipe, and then process it through hot rolling, cold rolling, cold drawing, etc., and then form a seamless steel pipe. Since the seamless steel pipe contains a hollow section, this hollow section can be used as a pipe for conveying fluid.
1. Performance of welded steel pipe
Welded steel pipes have the following properties due to high-frequency welding, cold rolling and other processes.
(1) Good heat preservation function. The heat loss of welded steel pipes is relatively small, only 25%, which is not only conducive to transportation, but also reduces costs.
(2) It has waterproof and corrosion resistance. In the process of engineering construction, it is not necessary to set up pipe trenches separately, but just bury the steel pipes directly in the ground or underwater, thereby reducing the construction difficulty of the project.
(3) It has impact resistance. Even in a low temperature environment, the steel pipe will not be damaged, so its performance has certain advantages.
2. Performance of seamless steel pipe
Due to the high tensile strength of the seamless steel pipe metal material, its ability to resist damage is stronger. Moreover, it has a hollow channel, so it can effectively transport fluids. It is its strong transport capacity, so the corrosion resistance of seamless steel pipes is higher than that of welded steel pipes, and its rigidity is relatively large. Therefore, the more load the seamless steel pipe can carry, it can be widely used in projects with higher construction requirements.(for example octg pipe)
Article source: https://article-realm.com/article/Business/49419-Performance-comparison-between-seamless-pipe-and-welded-pipe.html
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