HRB500 (Grade IV) is 12 mm in diameter, and it is widely used in large-scale pre-stressed construction, such as roof, crane beam, etc. It is often used in special buildings, such as villas. HRB400 (Grade Ⅲ) is similar to HRB 335, but it is of higher strength and higher price. It is commonly used for beams, columns, shear walls in large and medium-sized concrete structures, such as bridges, dams, houses, etc. HRB335 (Grade Ⅱ) is deformed steel bar, with a diameter of 12-25 mm. It is often used to make stirrups, wall reinforcement, and so on. HPB300 (Grade Ⅰ) is plain steel rebar, with a diameter of 6-12 mm. For example, HRB400 is hot-rolled ribbed steel bars, and its standard yield strength is 400MPa. The number stands for the minimum yield strength. ![]() ![]() Besides, “F” means fine grains while “E” stands for seismic (Earthquake) ductility. Here “H” stands for hot-rolled, “R” is for ribbed steel bar, “P” is for plain round bar, and “B” is short for bars. The common grades of hot rolled ribbed bars are HRB400, HRBF400, HRB400E, HRBF400E, HRB500, HRBF500, HRB500E, HRB600. The hot rolled steel bar is divided into plain round bar (HPB300) and ribbed bar. According to the production process, we have hot-rolled steel bar (H) and cold rolled steel bar (C). ![]() Reinforcement bar grade in China is subject to the requirements of Chinese Standards GB1499.2-2018. Besides, the use of a grade indicates the minimum yield strength. And the grade designation varies by country. Rebar (reinforcing bar) is available in different grades and specifications.
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