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Mechanical properties of rebar:
Tensile strength: It measures the maximum tensile force that rebar can withstand during the tensile process, and the unit is megapascal (MPa). For example, the tensile strength of HRB335 rebar is ≥445 MPa, the tensile strength of HRB400 is ≥540 MPa, and the tensile strength of HRB500 is ≥630 MPa.
Yield strength: It refers to the stress at which rebar begins to produce obvious plastic deformation. It is an important indicator for measuring the strength of steel, and the unit is MPa. For example, the yield strength of HRB335 is ≥335 MPa, the yield strength of HRB400 is ≥400 MPa, and the yield strength of HRB500 is ≥500 MPa.
Elongation after fracture: After the steel is broken, the percentage of the increased length of the gauge length part to the original gauge length reflects the plastic deformation ability of the steel. For example, the elongation after fracture of HRB335 is ≥17%, the elongation after fracture of HRB400 is ≥16%, and the elongation after fracture of HRB500 is ≥15%.
Ratio of tensile strength to yield strength: For seismic steel bars, the ratio of measured tensile strength to measured yield strength is not less than 1.25.
Ratio of measured yield strength to specified yield strength: For seismic steel bars, the ratio of measured yield strength to the yield strength specified by the standard is not greater than 1.30.
Total elongation at maximum force: The total elongation at maximum force of seismic steel bars is not less than 9%, and the total elongation of ordinary steel bars is 7.5%.