HPB steel bar is a round first-class steel bar with fy value =2 10MPa. In practical use, this kind of reinforcement is mainly used for stirrup and beard reinforcement (lacing reinforcement), as well as horizontal reinforcement and vertical reinforcement of shear wall. In the process of use, most of them need to be hooked. HRB500 grade steel bar is a newly developed hot-rolled ribbed steel bar for concrete structures in China. It has the characteristics of high strength and good ductility, and its cost performance is obviously higher than that of HRB400 and HRB335 steel bars currently used. At present, it has been included in the national product standard.

At this stage, HRB500 grade steel bars have preliminarily met the engineering application conditions and can be used in pilot projects.