RRB400 rebar is a residual heat treated ribbed rebar with a yield strength level of 400MPa. This rebar is strengthened by high temperature quenching and residual heat treatment, but its ductility, weldability and mechanical connection performance are reduced.

CHEMICAL COMPOSITION AND MECHANICAL PROPERTIES

The chemical composition of RRB400 rebar includes elements such as carbon (C), silicon (Si), manganese (Mn), phosphorus (P) and sulfur (S). The specific chemical composition ratio is as follows:

Carbon (C): 0.25%

Silicon (Si): 0.80%

Manganese (Mn): 1.60%

Phosphorus (P): 0.045%

Sulfur (S): 0.04%‌

ITS MECHANICAL PROPERTIES INCLUDE

Yield strength (0.2Rp0.2): ≥218 MPa

Tensile strength (Rm): ≥571 MPa

Elongation (A): 31%

Brinell hardness (HBW): 342‌

APPLICATION AREAS AND FEATURES

RRB400 steel bars are mainly used in foundations, walls, floor slabs and other components that do not require high deformation and processing performance. Due to its high strength and good corrosion resistance, it is also suitable for weather-resistant concrete structures and other projects with high corrosion resistance requirements‌.