CRB55 is a steel bar for ordinary reinforced concrete. Cold-rolled ribbed steel bar is a kind of steel bar with two or three crescent shapes, which is formed by cold-rolling hot-rolled wire rod for multiple passes, rib pressing for one pass and eliminating internal stress.

the brand of cold-rolled ribbed steel bar consists of CRB and the minimum tensile strength of steel bar. C, R and B are the first letters of cold-rolled, ribbed and reinforced respectively. CRB55 is steel bars for ordinary reinforced concrete, and other brands are prestressed concrete steel bars. Extended information

Use of p>CRB55

1. Main reinforcement and distribution reinforcement of cast-in-place floor slab and roof slab. The design value of tensile strength of cold-rolled ribbed steel bars of CRB55 grade after straightening can reach 36N/mm, so the tensile strength of straight steel bars must reach 55N/mm when sampling and inspecting the straightened steel bars on site.

2. Horizontal and vertical distribution bars in the shear wall. Because CRB55 cold-rolled ribbed bar has a large elongation, it can meet the seismic requirements when used in shear walls.

3. stirrups in beams and columns. When stirrups are calculated as stressed stirrups, the design value of tensile strength is 31 N/mm..

4. Reinforcement of ring beam and constructional column. CRB55 grade cold-rolled ribbed steel bars, especially welded mesh sheets, are suitable for expressway pavement, airport runways, large-diameter drainage pipes, drains, tunnels, etc.