The mechanical properties of finish-rolled threaded steel bars meet GB/T 20065-2006 "Threaded Steel Bars for Prestressed Concrete", and are widely used in large-scale water conservancy projects, industrial and civil buildings, continuous beams and large-scale frame structures, long-span bridges of highways and railways, nuclear power plants, ground anchors and so on. It has the advantages of simple connection and anchorage, strong adhesion, safe and reliable tension and anchorage, convenient construction and so on. Steel bars are saved, and the area and weight of components are reduced.