Rebar is a common name for hot-rolled ribbed steel bars. The grade of ordinary hot-rolled steel bar consists of HRB and the minimum yield point of the grade. H, R, and B are the first English letters of the three words, Hotrolled, Ribbed, and Bars, respectively. Hot-rolled ribbed steel bars are divided into three grades: HRB335 (the old grade is 20MnS), HRB400 (the old grade is 20MnSiV, 20MnSiNb, 20Mnti) and HRB500.
Overview
Fine-grained hot-rolled steel bar The first letter of the English (Fine) of “fine” is added to the brand name of the hot-rolled ribbed steel bar. like:
HRBF335HRBF400, HRBF500. The applicable grades for seismic structures with higher requirements are: add E after the existing grades (for example: HRB400E
HRBF400E)
Main use: widely used in civil engineering construction such as houses, bridges, roads, etc.
The difference between rebar and round bar: The difference between rebar and round bar is that there are longitudinal ribs and transverse ribs on the surface, usually with two longitudinal ribs and transverse ribs evenly distributed along the length direction. Rebar is a small section steel, mainly used for the skeleton of reinforced concrete building components. In use, certain mechanical strength, bending deformation performance and process welding performance are required. The raw material billets for the production of rebars are carbon structural steel or low-alloyed structural steel treated by sedation.
Structural steel, finished steel bars are delivered in hot-rolled, normalized or hot-rolled state.
type
There are two commonly used classification methods for rebar; one is classified by geometric shape, and classified or classified according to the cross-sectional shape of the transverse rib and the spacing of the ribs.
Type, such as British Standard (BS4449), the rebar is divided into | type, I type. This classification mainly reflects the gripping performance of the rebar. Two is
Performance classification (grade), such as my country’s current implementation standard, rebar is (GB1499.2-2007) wire rod is 1499.1-2008), according to the strength grade
Different (yield point/tensile strength), the rebar is divided into 3 grades; in the Japanese Industrial Standard (JISG3112), the rebar is divided into 5 types according to the comprehensive performance; in the British Standard (BS4461), the rebar is also specified Several levels of performance testing. In addition, the rebar can also be processed according to the application.
Classification, such as ordinary steel bars for reinforced concrete and heat-treated steel bars for prestressed reinforced concrete.
Post time: Aug-09-2022