The above specifications are the production specifications of Chinese steel factories, HRB400 and HRB400E are equivalent to ASTM A615, Grade 60

Alphabetical codes of steel bars of various grades in construction engineering: Primary steel bars: HPB235 and HPB300, ordinary smooth steel bars Secondary steel bar: HRB335, which is a threaded steel bar Tertiary steel bar: HRB400, HRB400E is a threaded steel bar Four grades of reinforcement: HRB500, HRB500E have crescent rib reinforcement and rebar

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