Steel rebar is commonly known as hot-rolled ribbed steel bars. H, R, B, respectively, hot-rolled (Hotrolled), ribbed (Ribbed), steel (Bars) the first three words of English letters. Hot-rolled ribbed steel sub-two HR ordinary hot-rolled steel grades by the HRB and its brands constitute the minimum yield point. B335 (old number 20MnSi), three HRB400 (old number 20MnSiV, 20MnSiNb, 20Mnti), four HRB500 three grades. Main uses: widely used in civil engineering construction of houses, bridges, roads and the like. The main origin: steel production home mainly distributed in North China and Northeast China, North China, such as Shougang, Tangshan Steel, Xuanhua Steel and Chengde Steel, dedication, Kuniyoshi, Jiujiang, Donghua, Jinxi, etc.