Hot-expanded Seamless Steel Pipe, commonly referred to as hot-expanded tube, is a type of steel pipe with low density but high shrinkage, (seamless steel pipe) which can be abbreviated as hot-expanded tube. It is a roughing process that uses oblique rolling or drawing to enlarge the diameter of the pipe material. This method can increase the outer diameter of the steel pipe in a short period, allowing for the production of non-standard and special type seamless pipes at a lower cost and higher production efficiency, and is currently the trend in the international rolling tube field.