PC Steel Bar In Coil With Screw Type Thread On Surface Prestressed steel bar is the compressive stress exerted on concrete members by pre-tensioning method or post-tensioning method before the use of structural members. In reinforced concrete structures, members will crack when they are tensioned. Although it does not affect safety, it does not feel good. In this method, the steel bar is first tensioned and then poured into concrete. When the strength reaches the requirement, the steel bar will be loosened, and the steel bar will shrink. The method of pre-tensioning and post-tensioning is to pour the reserved holes in the concrete, then add the tensioned steel bar after forming, and then anchor the two ends of the component with instruments. Applied to High-strength and stress tubular pile, pole,elevated bridge pier.ect