As two major categories in the steel pipe market, welded steel pipe and seamless steel pipe exhibit significant differences in production technology, application areas, and performance characteristics.

Differences in Production Technology
The production process for welded steel pipe is relatively simple and straightforward. It primarily involves rolling a steel plate or strip into a cylindrical shape and then welding the seams together to form the pipe. In this process, the weld is a notable feature of the straight seam welded pipe and one of the main differences between it and the seamless pipe. According to different welding methods, straight seam welded pipes can be divided into many types, such as arc welded pipes, high-frequency or low-frequency resistance welded pipes, gas welded pipes, and furnace welded pipes. Among them, high-frequency electric resistance welded pipes are widely used due to their high production efficiency and low cost.
The production process for seamless steel pipe is more complex. Seamless pipes are usually made from solid pipe billets (such as round steel) through processes such as piercing, hot rolling, cold rolling or cold drawing. These processes ensure that no welds are produced during the manufacturing process of seamless pipes, giving them higher integrity and strength. The production of seamless steel pipes has high requirements on raw material quality, process control and equipment precision, so its production cost is relatively high.

Performance Comparison: Seamless steel pipes, due to their weld-free design, offer superior pressure resistance and strength. When the diameter and wall thickness are equal, the pressure and strength of seamless pipes are much greater than those of straight seam welded pipes. This characteristic makes seamless pipes safer and more reliable in harsh environments such as high pressure, high temperature, and high corrosion. Therefore, in the oil, natural gas, chemical, electric power and other industries, seamless steel pipes are widely used in key components such as transmission pipelines, boiler tubes, and heat exchangers.

Although welded steel pipes have welds during the production process, modern welding technology can ensure that the quality of the welds reaches a higher standard. However, since the mechanical properties of the weld are lower than those of the base material, the use of welded steel pipes under extreme conditions such as high pressure and high temperature is subject to certain restrictions. However, straight seam welded pipes have the advantages of high production efficiency, low cost, and a wide variety of specifications, which give them broad application prospects in low pressure, room temperature, and general corrosive environments. For example, in the fields of construction, agriculture, machinery manufacturing, etc., welded steel pipes are used as scaffolding pipes, greenhouse pipes, fluid conveying pipes, etc.

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