Carbon steel reinforcing bars, also known as threaded steel bars or round steel bars, are special reinforcing steel materials used in concrete engineering. They enhance the overall strength of the structure by relying on the bond strength between the steel bars and concrete. The products are mainly divided into two categories: hot-rolled plain round steel bars (HPB series) and hot-rolled ribbed steel bars (HRB series). They are produced using a continuous hot rolling process, and the surface can be smooth round, spiral/herringbone/crescent-shaped ribs.