HRB400E steel bar is first of all reinforced with E, that is, the seismic steel bar in the new code. The yield of HRB400E steel bar is 400MPa, which has good seismic performance. The full name of English HRB is translated as hot rolled ribbed steel bar. Hot rolling is the finished steel bar which is formed by hot rolling and naturally cooled, and is pressed at high temperature. The main steel body structure is low-carbon alloy, which has better ductility than HRB400 steel bar. It can effectively protect the safety of important steel structural members under the destruction of natural disasters such as earthquakes, and has sufficient plastic deformation capacity and energy consumption capacity. It is often called tertiary rebar on the construction site, and it is also called tertiary rebar because HRB400E rebar is spiral rib marks. In fact, it usually refers to HRB400, but in many cases, HRB400E will also be simply referred to as tertiary rebar in many construction sites. Of course, it will be standardized to say tertiary seismic rebar or tertiary seismic threaded rebar when purchasing.
After knowing what grade of reinforcement HRB400E is, let's take a look at the difference between reinforcement with E and reinforcement without E. The main advantage of reinforcement with E is its higher ductility, which can effectively prevent large-scale tearing, fracture and serious deformation of steel structures in earthquake disasters. The standard marked in the latest national code for the use of steel bars is that reinforcement with E bears more than 25% tension from yield to tensile failure than that without E. In addition, the dispersion of yield strength of reinforcement will not be too large, which should not affect the design of reinforcement structures. Generally speaking, the reinforced bar with E is much stronger in tensile strength and ductility than the reinforced bar without E, and it is more earthquake-resistant in use.
Mechanical properties of tertiary rebar
Carbon: increasing the carbon content of steel can improve the strength performance of steel, but make the welding performance and cold bending performance of steel worse.
Phosphorus: it can significantly improve the strength limit of steel, but make the cold brittleness, weldability and cold bending performance of steel worse.
Sulfur: Sulfur is harmful to most properties of steel.
Oxygen: Oxygen has an adverse effect on most properties of steel.
Manganese: Manganese can significantly improve the strength limit of steel, but it reduces the elongation of steel, and the content is too high, which makes the weldability worse.
Silicon: Silicon can improve the yield strength of steel, but when the content is too high, it will increase the cold brittleness of steel and worsen the weldability.
Nitrogen: Nitrogen will deteriorate most properties of steel.
The above are the mechanical properties of threaded steel bars and the influencing factors. Therefore, the chemical composition determines the mechanical properties of steel. Different steels use different chemical compositions and have different mechanical properties, so there are many kinds of steel products.
Some friends in HRB400E steel bar may not understand what it means, which means that the surface of steel bar is deformed after hot rolling process, thus increasing the bite force between concrete and steel bar, so as to achieve more efficient fixation. This means to help, so the third-grade rebar is often used in building construction, but in projects with high building quality requirements, the more advanced fourth-grade rebar may be used. The above is the content of the three-grade rebar material introduced by Xiaobian.
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