HRB400 Rebar spiral hot-rolled steel bar HRB400E three-level earthquake-resistant rebar

Product Description

HRB400 Rebar spiral hot-rolled steel bar HRB400E three-level earthquake-resistant rebar

HRB400 steel bars were formerly known as third-grade rebar, which is a type of hot-rolled ribbed steel bar. In the construction industry, grade 3 rebar is what it used to be called. Manufacturers in my country are mainly located in North China and Northeast China, and these two regions account for more than 50% of the total rebar production.

Brand HRB400 (old brands are 20MnSiV, 20MnSiNb, 20Mnti) and brand HRB400E

The Chinese name of HRB 400 is hot-rolled ribbed steel bar, with a diameter of 6~50mm. The national mandatory standard GB1499.2-2007 "Hot-rolled ribbed steel bars for reinforced concrete" will be implemented from March 1, 2008. The new standard replaces GB1499-1998 "Hot-rolled ribbed steel bars for reinforced concrete" and GB13014-1991 " "Residual heat treated steel bars for reinforced concrete", compared with the original standard GB1499-1998, the grade III steel bars in the old standard were renamed HRB400 grade steel bars under the new standard.

Rebar HRB400 mainly represents hot-rolled ribbed steel bars with a compressive strength of 400MPa and manufactured through a hot-rolling process. "HRB" is the code name for steel bars, which means hot-rolled ribbed steel bars manufactured through hot-rolling technology. "400" represents the pressure resistance, and the pressure it can withstand is 400MPa.

How to choose steel bar HRB400

1. When selecting HRB400 steel bars, you must first look at its surface. Choose one with a neat surface and no cracks. Cracks will affect the bearing capacity of the steel bars and may easily cause breakage. If the steel bar breaks, the danger caused is relatively large.

2. The overall color and luster of good HRB400 steel bars are also different. If the luster is relatively good and the color is relatively uniform, this kind of steel bar means that its materials are relatively evenly blended in all aspects, and the stress levels in various places are relatively even, which will not cause one side to be harder and the other side to be more fragile. situation, so such steel bars are also better.

3. When purchasing HRB400 steel bars, you can ask to see the production batch number of this batch of HRB400 steel bars and some relevant certificates of production license to ensure the quality of the steel bars.

What does HRB400e steel bar mean?

This is a kind of steel bar with seismic resistance standards. It is collectively called E steel bar. The strength level can reach 400MPa and has seismic resistance. In addition, the key to this type of steel bars is that the super-yield ratio index cannot be too large and the elongation cannot be too small.

The difference between third-grade rebar and second-grade rebar can be divided into the following aspects:

1. Different steel types (different chemical compositions). HRB335 grade steel bars are 20MnSi (20 manganese silicon); HRB400 grade steel bars are 20MnSiV or 20MnSiNb or 20MnTi, etc.;

2. Different strengths. The tensile and compressive design strength of HRB335 steel bars is 300MPa, and the tensile and compressive design strength of HRB400 steel bars is 360MPa.

3. Due to the different chemical composition and ultimate strength of steel bars, there are also differences in toughness, cold bending, fatigue resistance and other properties.

Specification: