Steel is a common material used in our everyday life. It is used to manufacture tubes and pipes. Though these 2 words are often interchanged they differ in their meaning. A Steel Tube is usually used in structural applications hence the outer dimensions become important. They are used in medical devices that require the outer dimensions to be precise. Whereas, a steel Seamless Pipe is usually used to transfer gas and liquids. Therefore knowing the capacity is important to understand the volume of the said product being transferred through the pipe. They are available in 2 types, seamless and welded pipe. The welded pipe is made by welding a strip to form a pipe. The welded point is the weakest point of the Steel Pipes and Tubes on the other hand a Seamless Tube is drawn from billets hence they do not have a joint that makes them weak.