Welded steel pipes have higher bending and torsional strength and greater load-bearing capacity, so they are generally widely used in the manufacture of mechanical parts. For example, oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction are all made of welded steel pipes. However, seamless steel pipes can be used as pipelines for conveying fluids because they have a hollow cross-section and are long strips of steel with no seams around them. For example, they can be used as pipelines for conveying oil, natural gas, coal gas, water, etc. In addition, the bending strength of seamless steel pipes is relatively small, so they are generally widely used in superheated steam pipes for low and medium pressure boilers, boiling water pipes, and superheated steam pipes for locomotive boilers. In short, welded steel pipes and seamless steel pipes can be clearly distinguished by the classification of uses.
In order to ensure higher quality of engineering construction, welded steel pipes and seamless steel pipes must be distinguished, and then appropriate steel pipes must be used for construction. In the process of distinguishing welded steel pipes and seamless steel pipes, metallographic methods and corrosion methods can be used to observe the structure and welds, thereby inspecting the welds and finally accurately distinguishing them. At the same time, the two types of steel pipes can be distinguished according to their performance, purpose, etc., and then reasonable steel pipes can be selected for construction.
seamless steel pipe
