Product introduction
◆ The composition and meaning of rebar grades:
◆ The composition and meaning of rebar grades:
Ordinary hot-rolled steel bars:
HRB400 rebar is composed of HRB+yield strength characteristic value.
HRB400E rebar is composed of HRB+yield strength characteristic value+E.
HRB is the abbreviation of Hot rolled Ribbed Bars.
E is the first letter of Earthquake.
Similarly, there are two grades of fine-grained hot-rolled steel bars, HRBF400 and HRBF400E, in which HRBF is the initial letter of "Fine" added after the abbreviation of Hot rolled Ribbed Bars.
◆ Properties
Chemical properties:
| HRB400 Steel | Grade | C | Si | Mn | P | S | carbon equivalent Ceq % |
HRB400 HRBF400 HRB400E HRBF400E | ≤0.25 | ≤0.80 | ≤1.60 | ≤0.045 | ≤0.045 | ≤0.54 |
Mechancal properties:
| HRB400 Steel Rebar | Grade | Lower Yield Strength ReL MPa | Tensile Strength Rm MPa | Elongation after break A % | Total Elongation at maximum force Agt % | Rom/ReL | RoeL/ReL |
HRB400 HRBF400 | ≥400 | ≥540 | ≥16 | ≥7.5 | - | - | |
HRB400E HRBF400E | - | ≥9.0 | ≥1.25 | ≤1.30 | |||
| Note: Rom is the measured tensile strength of steel bars; RoeL is the measured yield strength of steel bars. | |||||||
Bending properties:
HRB400 carbon steel rebar should be subjected to bending test.After the diameter of the bending indenter is bent by 180°, the surface of the HRB400 rebar subject to bending must not produce cracks.
| HRB400 Rebar | Grade | Nominal diameter d(mm) | Bending head diameter |
HRB400 HRBF400 HRB400E HRBF400E | 6~25 | 4d | |
| 28~40 | 5d | ||
| ＞40~50 | 6d |
