What does it mean in the construction quality acceptance code for reinforced concrete structure engi

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.

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.

Calm steel is relative to boiling steel, mainly because of different processing techniques and different steelmaking methods. According to the different degrees of deoxidation during steelmaking, steel can be divided into three categories: boiling steel, calm steel and semi-calm steel. Boiling steel is steel with incomplete deoxidation.

When pouring, the molten steel boils in the ingot die (gas escapes), and after the ingot solidifies, honeycomb bubbles are distributed in the ingot, and the cavities of these bubbles are bonded during the rolling process. This type of steel is characterized by a very low silicon content in the steel, and is usually injected into a small ingot with a small upper and lower size without a thermal insulation cap. The advantages are high yield of steel, low production cost, good surface quality and deep drawing performance.

The disadvantage is that there are many impurities in the steel, and the segregation of the components is large, so the performance is uneven. Tranquilizer steel is a completely deoxidized steel. It is usually cast into a large and small ingot type with a thermal insulation cap, and the molten steel is calm and does not boil when poured.

Because there is a thermal insulation cap on the upper part of the ingot die (used to supplement the molten steel when the molten steel is solidified), this section of the cap head needs to be cut off after rolling and opening the billet, so the yield of the steel is low, but the structure is dense, the segregation is small, and the quality is uniform. High-quality steels and alloys are generally calming steels. Semi-calm steel is a steel with complete deoxidation.

The degree of deoxidation is between boiling steel and calm steel, and there is boiling phenomenon when pouring, but it is weaker than that of boiling steel. This type of steel has some advantages of boiling steel and calming steel, which is more difficult to master in smelting operations.

HRB400E is a hot-rolled ribbed steel bar with a yield strength of not less than 400MPa

hrb400 do you know what it means!! The E at the back is for seismic reinforcement.

HRB400E steel bar refers to the ordinary steel bar with a strength level of 400MPa and seismic performanceHot-rolled ribbed steel bars

This is a kind of steel bar with seismic standards, which is collectively referred to as steel bar with e.

The strength level can reach 400MPa with seismic resistance.

1. Tensile strength.

Measured value and yield strength.

The ratio of the measured values shall not be less than;

2. The ratio of the measured value of the yield strength of the steel bar to the standard value of the land search shall not be greater than that;

3. Under the maximum force of the steel bar Shichang, the total elongation shall not be less than 9%.

HRB400E grade is a grade with high seismic structure requirements, this kind of steel bar in addition to the following three requirements, other (mechanical properties) and the corresponding existing grade of steel bar. That's what HRB400E rebar grade E means.

How should the rebar be maintained:

1. After the steel bar arrives at the site, it will not be used immediately and should be stored in the warehouse. At this time, special attention should be paid to the selection of the warehouse, the warehouse where the steel bars are stored must not be too wet, must be dry, and the warehouse must be tidy, so as not to stain too much dust on it and affect the use.

2. When the steel bars are stored, they should be stacked reasonably, and some different types should be separated to prevent confusion, and it is more convenient to find them in the later stage, which can also prevent the steel bars from corroding each other. If you want to put it on an angle steel in the open air, remember that the mouth is facing down, and there are some I-beams.

It should be placed upright.

3. After the steel bar is made, a layer of preservative is generally coated on the surface.

And wrap it up, so that it also prevents it from corroding.

The above content is the relevant information about HRB400E rebar, I hope my help can help you.

The E in the HRB400E steel bar grade marks that the steel bar products have reached the "seismic resistance" standard promulgated by the state.

HRB is the English abbreviation of hot-rolled ribbed bar, that is, hot-rolled ribbed steel bar, the so-called ribbed steel bar refers to the deformation of the surface of the steel bar through the hot rolling process to increase the occlusion force between the steel bar and the concrete, including the surface ribbed steel bar, spiral steel bar, herringbone steel bar, crescent pattern steel bar, etc.

The article of the national standard "Steel for Reinforced Concrete Part 2: Hot-rolled Ribbed Steel Reinforcement" stipulates as follows: The steel bar with E after the grade shall meet the following requirements:

a) The ratio of the measured tensile strength to the measured yield strength of the steel bar is not less than;

b) The ratio of the measured yield strength of the reinforcement to the characteristic value of the yield strength is not greater than;

c) In addition to the three requirements of the maximum force and total elongation of the steel bar is not less than 9%, the other requirements are the same as the corresponding existing grade steel bar.

That is to say, the chemical composition, carbon equivalent limit, tensile strength, yield strength, strength design value, elastic modulus and other basic mechanical properties of the steel bar with E are the same as those of the same grade of hot-rolled ribbed steel bar without E.

The essential difference between the seismic steel bar with E and the ordinary steel bar is to make the steel bar obtain better ductility, so as to better ensure that the important structural components have sufficient plastic deformation capacity and energy dissipation capacity.

Hello, I'm glad to answer for you. HRB400E steel bar is a pure bending material of hot-rolled steel bar made in China, which is one of the HRB series steel bars. HRB400E is a high-strength steel bar material with good mechanical properties, which is mainly used in the reinforcement construction of concrete structures, housing construction and large-scale foundation engineering.

HRB in its name is an abbreviation for Hot Rolled Reinforcing Bar, which means hot rolled reinforcing bar; 400E means that the tensile strength reaches 400MPa, and E stands for "strong steel bar" (E stands for enhanced), which is a kind of HRB series of high-strength steel bars. It should be noted that when using steel bars in engineering construction, the corresponding models and specifications should be selected according to the design requirements, the performance of steel bar materials and the actual construction situation, and also need to comply with relevant national standards and regulations to ensure the safety and quality of the project.

HRB400E is one of the steel bar grades specified in the Chinese National Standard GB T Steel Bar for Sakura Concrete Part 2: Hot Rolled Steel Bar, which refers to the hot-rolled ribbed steel bar, where HRB represents the code of the hot-rolled ribbed steel bar, 400 means that the tensile strength of the steel bar is 400 megapascals (MPa), and E means that the macro cluster elastic modulus of the steel bar is megapascal (MPa). HRB400E steel bar Zen Li has a wide range of uses, and is generally used for concrete reinforcement and reinforcement in engineering buildings, such as bridges, tunnels, large-scale water conservancy projects, high-rise buildings and other structures.

The main characteristics of the steel bar are high strength, good reliability, strong durability, and good tensile, compressive and flexural strength, which can provide effective support and protection for engineering structures.

Hello for you to check the jujube fiber to HRB400E steel bar refers to the steel used in reinforced concrete (RC) structure, which is processed on the basis of Q235 type low carbon steel, so it is also called Q235 steel bar. Its main components are: rock-resistant and:

HRB400E steel bar has good mechanical properties, and has the advantages of high crack tensile strength, high tensile and compressive strength and high ductility, Changji can better ensure the stiffness and flexural performance of concrete structures, and can also effectively resist extreme conditions such as environmental temperature changes and **, which is one of the indispensable steel reinforcement materials in the field of modern construction.

Summary. Pro-3 HRB400E steel bar is a kind of ordinary carbon steel bar, its grade is HRB400E (national standard abbreviation HRB400), commonly referred to as steel bar, in that the toughness is good, can withstand relatively large deformation capacity, tensile and compressive strength are relatively high, suitable for structural engineering, with strong crack resistance. The "HR" in HRB400 stands for hot rolled; "B" stands for bonded, that is, bonded; 400 represents tensile strength, that is, tensile strength, the unit is mpa, and the general E suffix indicates that this carbon steel bar also has ordinary type, high strength type, and ultra-high strength type.

HRB400E rebar can be used in bridges, arch bridges and other large and extra-high-strength concrete structures where they need to be used.

Pro-3 HRB400E steel bar is an ordinary carbon steel bar, its grade is HRB400E (national standard abbreviation HRB400), commonly referred to as steel bar, good toughness, can withstand relatively slippery deformation can tease land force, tensile and compressive strength are relatively high, suitable for structural engineering, with strong crack resistance. The "HR" in HRB400 stands for hot rolled; "B" stands for bonded, that is, bonded; 400 represents tensile strength, that is, tensile strength, the unit is mpa, and the general E suffix indicates that this carbon steel bar also has ordinary type, high strength type, and ultra-high strength type. HRB400E rebar can be used in bridges, arch bridges and other large and extra-high-strength concrete structures where they need to be used.

You can refer to Oh dear, kiss the epidemic repeatedly, Duan Hanwu pay attention to personal protection or correctly standardize the wearing of Lao Xian masks, do not gather, do not get together, ventilate frequently, and wash hands frequently. Take good personal protection.