Theoretically, structural steel pipes should be the same, with not much difference. Straight seam welded pipes are less regular than seamless pipes, and the centroid of welded pipes may not be at the center. Therefore, special attention is needed when used as pressure-bearing components. The probability of defects in the weld seam of welded pipes is relatively high, and important parts cannot be replaced by seamless pipes. Due to processing technology limitations, the wall thickness of seamless pipes cannot be made very thin (the average wall thickness of seamless pipes with the same diameter is thicker than that of welded pipes). In many cases, the material utilization efficiency of seamless pipes is not as good as that of welded pipes, especially for large diameter pipes. The biggest difference between seamless and welded pipes is their use in pressure gas or liquid transmission (DN). | 
