What does HRB400E mean, what does HRB400 mean

The full name of HRB is Hot -Rolled Ribbed -Steel Bar.

The following number is the yield strength of the steel bar, for example, HRB500 refers to the hot-rolled ribbed steel bar, the yield strength is 500MPa, 335 is the yield strength of 335MPa, and 400 is 400MPa.

The last e, which means that the steel has seismic properties.

HRB400E is a seismic hot-rolled rebar, while HRB400 belongs to ordinary rebar.

Seismic steel bars, steel bars are divided into a variety of kinds, there are A, B, C, D, E, there are boiling steel, semi-calm steel, calm steel, special calm steel, class E should be special calm steel, with the increase of the number of steel the better.

The Chinese name of HRB 400 is hot-rolled ribbed steel bar, the diameter is 6 50mm.

National mandatory standard for reinforced concrete with hot-rolled ribbed steel bar" from March 1, 2008 to implement, the new standard replaces GB1499-1998 "hot-rolled ribbed steel bar for reinforced concrete" and GB13014-1991 "reinforced concrete with waste heat treatment steel bar", compared with the original standard GB1499-1998 in the old standard of the grade steel bar under the new standard renamed HRB400 grade steel bar.

Model Number:

HRB335 (20MnSi), the standard value of the yield strength of this steel bar is 335MPa, the diameter is 6 50mm, and the elastic modulus is 200GPA. HRB400 (20Mnsiv, 20Mnsinb, 20MnTi), the standard yield strength of the steel bar is 400MPa, and the design value is 360MPa.

The diameter is 6 50mm, and the modulus of elasticity is 200gpa. The symbol HRB400E refers to the ordinary hot-rolled ribbed steel bar with a strength level of 400MPa and seismic performance. The core of the steel bar with E is that the overyield index of the steel bar should not be too large, and the strong yield ratio and elongation index should not be too small.

1. The seismic resistance is different.

HRB400E is more malleable than HRB400.

Better, better shock resistance.

2. The total elongation is different.

HRB400E is increased from the maximum force total elongation of ordinary steel bars to not less than 9%.

3. The tensile force is different.

The seismic steel bar stipulates that it should also withstand more than 25% of the tensile force from yield to break, which is higher than that of ordinary steel bar.

, b), c) requirements: a) the ratio of the measured tensile strength of the reinforcement to the measured yield strength r°m r°el is not less thanb) The ratio of the measured yield strength of the reinforcement to the yield strength eigenvalue specified in Table 6 r°el rel is not greater than

c) The maximum force of the reinforcement is total.