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Steel rebar is commonly known as hot-rolled ribbed steel bars. Ordinary hot-rolled steel grades by the HRB and its brands constitute the minimum yield point. H, R, B, respectively, hot-rolled (Hotrolled), ribbed (Ribbed), steel (Bars) the first three words of English letters. Hot-rolled ribbed steel sub-two HRB335 (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 steel.