How is the strength for the welded steel pipe?

Whether viaduct, trestle, or scaffold, strength of these products should be guaranteed when they applied in various functions in our daily life and engineering project. So why should we choose the welded steel pipes like ERW steel pipe? We should discuss this from the strength character in welded steel pipes. We can take wood pipe, plastic pipe and welded steel pipe for comparison. For example, if we need some pipes for scaffold or buried pipelines. Which one you would like to choose? Answer is welded steel pipe would be first one choice! Due to its original material, such as steel, carbon, silicon, manganese, sulfur, phosphorus and so on, this gives steel pipes special resist internal and external pressure even with light weight pipe. We should know that minimum yield strength of most pipe-grade steel is 42,000 psi(290 MPa). Higher strength steels are available. Of course, for wood or plastic pipe, they may not can handle a man’s weight while steel pipes can hold on the car’s weight when they are buried underground. Meanwhile, depending on joints which can be welded, steel pipe’s pressure would not require thrust blocks at special sections like valves, tees and so on which wood and plastic products cannot do it. So steel pipe would be a nice choice for us when clients need them.