HRB500 hot-rolled ribbed steel bars, commonly known as grade IV threaded steel, are high-strength concrete-reinforcing steels with a yield strength of not less than 500MPa. HRB is an abbreviation for Hot-rolled Ribbed Bar, and 500 represents the minimum yield strength of 500MPa. The product is manufactured using a micro-alloyed temperature-controlled rolling process, featuring crescent-shaped transverse ribs and two longitudinal ribs on the surface, resulting in extremely strong bond strength with concrete and significantly improving structural load-bearing capacity and seismic safety.