HRB400 hot-rolled reinforced bar
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HRB400 - Definition
That is the new standard name for HRB400 steel, grade three steel as the old name, as a kind of hot rolled ribbed bar. In the construction industry, three screw steel is the old saying.
Hot rolled ribbed steel grades by HRB and number of yield points minimumcomposition. H, R, B respectively (Hot rolled), hot rolled ribbed steel bar(ribbed), (Bars) the three word's first letter English.
HRB400 - Classification
Hot rolled ribbed steel bar is divided into HRB335 (the old number is 20MnSi),HRB400 (the old No. 20MnSiV, 20MnSiNb, 20Mnti), HRB500 three brands.
Hot rolled bars of fine grains in the grades of hot rolled ribbed bar after Englishabbreviation "fine" English (Fine) the first letter. Such as: HRBF335, HRBF400,HRBF500.
A suitable grade higher requirements for seismic structures: add E in the existing brands after (for example: HRB400E, HRBF400E).
HRB400 - the main purposes
Widely used in houses, bridges, roads and other civil engineeringconstruction.
HRB400 - the main origin
Screw thread steel producers in China are mainly distributed in the north and Northeast China, North China regions such as Shougang, Tang Gang, Xuan Steel, bearing steel, Shanxi Zhongyang steel plant, Baoding Purui the steel,the northeast area such as resistant, Bei Tai, Fushun Steel, these two areas account for about 50% of the total output in the screw thread steel.
The difference between the screw thread steel and round steel bar is provided with longitudinal ribs and transverse ribs surface, usually with two longitudinalribs and transverse ribs along the length direction of the uniform distribution.Screw thread steel belongs to the small steel steel, mainly used in reinforced concrete building components of the skeleton. In use requires a certainmechanical strength, flexural property of welding technology and properties.Screw thread steel billet production raw material for the carbon structure steelsmelting processing sedation or low alloy structural steel, finished steel for the hot rolling, normalizing or hot-rolled state of delivery.
The bending properties of HRB400 - reverse
According to the requirements of the buyer, screw steel for bendingperformance of reverse test.
Reverse bending test bending test bending center diameter than a corresponding increase in rebar diameter. The first positive bending 45 degrees, 23 degrees backward bending, reverse bending 23 degrees after.The reverse bend test, screw steel bending parts shall not generate cracksurface.
HRB400 - surface quality
Screw thread steel surface shall not be permitted to have crack, scarring andfolding.
Screw thread steel surface allows the bumps, but shall not exceed thetransverse rib height, depth of thread other defects on the surface of steel andheight shall not allow the deviation is greater than the location dimension.
HRB400 - dimension, shape, weight and permissible deviations
1 nominal diameter range and recommended diameter
Screw thread steel of nominal diameter range of 6 ~ 25mm, screw steelnominal diameter standard recommended for 6, 8, 10, 12, 16, 20, 25, 32, 40,50mm.
2 surface shape and size of the allowable deviation of rib steel plate
Ribbed Rebar shall meet the following basic rules of transverse ribs:
The included angle beta transverse rib and steel plate axis should not be less than 45 degrees, while the angle of not more than 70 degrees, the screw thread steel on both sides of the transverse rib of relative direction should bethe opposite;
Transverse rib and spacing L not greater than 0.7 times the nominal diameter of the screw thread steel;
Transverse rib side and screw steel surface shall not be less than 45 degreesangle;
The gap between the screw thread steel on both sides of the end of therelative transverse ribs (including longitudinal rib width) should not be greater than the nominal sum of screw thread steel perimeter 20%;
When the screw thread steel nominal diameter is less than 12mm, the relativerib area should not be less than 0.055; some nominal diameter is 14mm and 16mm, the relative rib area should not be less than 0.060; nominal diametergreater than 16mm, the relative rib area should not be less than 0.065.
The length and the allowable deviation of 3
A, length: screw steel usually according to fixed length delivery length, specific delivery length should be specified in the contract; some thread steel to coil at the time of delivery, every dish is a screw steel, allowing each batch of 5%number (less than two wheel is two disc) consisting of two screw thread steel.The wheel weight and diameter of disc by both sides provisions.
B, length tolerance: screw thread steel according to fixed length delivery length when the allowable deviation shall not exceed +50mm.
C, the bending degree and end: allergic straight thread steel bending does not affect the normal use, the total bending degree greater than the total length ofthread steel 40%; screw steel end should be cut straight, local deformationshould not affect the use. [1]
HRB400 - the need to detect project
Inspection items include: serial number of certificate, rolling furnace number,grade, chemical composition (C, Si, Mn, P, V), tensile strength, yield point,percentage elongation, relaxation rate, sectional area, product name,specifications, quantity, date of production, the implementation of standards,receiving unit etc.. Acceptance only after passing inspection will only be forrebar.
- Q: What is the role of steel rebars in roof slab construction?
- The strength, durability, and reinforcement provided by steel rebars are crucial in roof slab construction. These rebars reinforce the concrete and increase its load-bearing capacity, allowing the roof to withstand external forces such as live loads, dead loads, and wind loads. To create a strong bond with the concrete, the rebars are strategically placed within the roof slab, forming a mesh-like structure. This reinforcement prevents the concrete from cracking or breaking under heavy loads, ensuring the structural integrity of the roof. Additionally, the rebars help distribute the load evenly, reducing the risk of localized stress concentration. By incorporating steel rebars into the roof slab, it becomes capable of resisting tensile forces that concrete alone cannot effectively handle. This is crucial as roofs are exposed to various forces like wind uplift and temperature changes. The rebars act as a backbone, absorbing and dispersing these forces throughout the slab, preventing any potential structural failures. Furthermore, steel rebars also provide resistance against deformations caused by shrinkage and thermal expansion of the concrete. These factors can lead to cracks and instability in the roof slab, but the presence of rebars helps control and limit such deformations, maintaining the overall stability of the structure. In conclusion, steel rebars play a vital role in roof slab construction, providing reinforcement, strength, and durability to the concrete. They enhance the load-bearing capacity, resist tensile forces, distribute loads evenly, and prevent cracking or breaking, ensuring the long-term structural integrity and stability of the roof slab.
- Q: What are the different types of steel rebars used in foundation construction?
- There are several types of steel rebars commonly used in foundation construction, including plain round bars, deformed bars, epoxy-coated bars, and galvanized bars. Plain round bars are smooth and have no surface deformations, making them suitable for lightweight applications. Deformed bars have ribs, lugs, or other surface deformations that provide better bonding with concrete and enhance the strength of the foundation. Epoxy-coated bars are coated with a layer of epoxy to protect against corrosion, making them ideal for areas with high moisture or chemical exposure. Galvanized bars are coated with a layer of zinc to prevent rusting and corrosion, making them suitable for outdoor or marine environments.
- Q: What are the guidelines for the proper installation of steel rebars?
- The proper installation of steel rebars is crucial for ensuring the structural integrity and durability of reinforced concrete structures. Here are some guidelines to follow for their proper installation: 1. Planning and Design: Before beginning the installation, it is important to have a detailed plan and design in place. This includes determining the required rebar size, spacing, and configuration based on the structural requirements and specifications. Consulting structural engineers and adhering to local building codes and regulations is essential. 2. Cutting and Bending: Rebars should be cut and bent accurately according to the design specifications. Proper tools such as rebar cutters and benders should be used to ensure clean cuts and precise bends. Any damaged or corroded rebars should be discarded and replaced. 3. Cleaning and Preparation: The surface of the rebars must be free from any contaminants like rust, oil, dirt, or loose scales before installation. Cleaning the rebars using wire brushes or air blasting is recommended to ensure proper adhesion between the rebar and concrete. 4. Placement and Positioning: The rebars should be placed and positioned accurately as per the design drawings. They should be securely tied or supported using tie wires or rebar chairs to maintain the desired spacing and alignment. Splices should be made in accordance with the design requirements and properly lapped to ensure continuity and strength. 5. Concrete Cover: The rebars should be adequately covered with concrete to protect them from corrosion and provide fire resistance. The concrete cover thickness should meet the design specifications and local building codes. Proper spacing between rebars and formwork should be maintained to allow proper concrete flow and consolidation. 6. Anchorage and Embedment: Adequate anchorage and embedment of rebars are essential for transferring loads and ensuring structural stability. Special care should be taken to provide proper hooks, bends, or mechanical anchorage at the ends of rebars as per the design requirements. The rebars should be properly embedded into the adjacent concrete elements to achieve the desired bond strength. 7. Inspection and Quality Control: Regular inspection should be carried out during the installation process to ensure compliance with the design specifications and quality standards. Any deviations or defects should be identified and rectified promptly. It is important to document the installation process and maintain proper records for future reference. By following these guidelines, the proper installation of steel rebars can be achieved, ensuring the structural strength, longevity, and safety of reinforced concrete structures.
- Q: What are the different grades of steel rebars available?
- In the market, there are various grades of steel rebars available, each with its own specific characteristics and applications. The commonly used grades are as follows: 1. Grade 40: This rebar has low strength and is suitable for general construction purposes where high tensile strength is not necessary. It is commonly utilized in residential buildings, sidewalks, and driveways. 2. Grade 60: Offering higher tensile strength than Grade 40, this rebar is of medium strength. It finds wide usage in commercial buildings, bridges, and infrastructure projects. Grade 60 rebar provides excellent reinforcement for heavy loads and ensures structural stability. 3. Grade 75: With exceptional tensile strength, this rebar is of high strength and is often employed in challenging construction projects. It is commonly used in high-rise buildings, parking garages, and industrial structures to ensure superior reinforcement and structural integrity. 4. Grade 80 and higher: These rebars are designed for specialized applications where extreme load-bearing capacity is required. They are commonly used in heavy-duty infrastructure projects, such as dams, tunnels, and nuclear power plants, where the demand for strength is significantly greater. The selection of the grade of steel rebar depends on factors such as the specific construction project, load-bearing requirements, and environmental conditions. Engineers and architects assess these factors to determine the most suitable grade of steel rebar for a particular application, ensuring optimal performance and structural durability.
- Q: Can steel rebars be used in the construction of swimming pools?
- Yes, steel rebars can be used in the construction of swimming pools. Steel rebars are commonly used to reinforce concrete structures, including swimming pools, as they provide strength and durability to the pool's structure.
- Q: How do steel rebars prevent cracking in concrete?
- The reinforcement provided by steel rebars is essential in preventing cracking in concrete. By increasing the overall strength and durability of the structure, steel rebars counteract the tensile forces that cause concrete to crack. To create a reinforcing mesh or framework, high-strength steel rebars are strategically placed within the concrete. This mesh acts as a skeleton, effectively absorbing and distributing the tensile forces throughout the structure. As a result, cracks are prevented from forming. When external loads, such as heavy weights or seismic forces, are applied to the concrete, the rebars bear the tensile stress instead of the concrete itself. This is possible because steel rebars have a much higher tensile strength compared to concrete. By distributing stress more evenly, the rebars minimize crack formation and help maintain the concrete's structural integrity. Additionally, steel rebars improve the bond between the concrete and the reinforcement, further preventing cracks. While concrete has excellent compressive strength, its tensile strength is relatively low. The inclusion of rebars increases the overall tensile strength of the concrete, reducing the likelihood of cracking under tension. The bond between the rebars and the concrete creates a composite material that can effectively withstand both compressive and tensile forces. In summary, steel rebars play a crucial role in preventing cracking in concrete. They provide reinforcement, absorb tensile forces, and enhance the overall strength and durability of the structure. By acting as a skeleton within the concrete and distributing stress, they prevent the formation of cracks and ensure the long-lasting stability of the construction.
- Q: Are steel rebars suitable for use in earthquake-prone regions?
- Yes, steel rebars are suitable for use in earthquake-prone regions. Steel rebars are commonly used in the construction industry to reinforce concrete structures, making them stronger and more resistant to the forces generated by earthquakes. The ductile nature of steel allows it to absorb and distribute the energy produced during an earthquake, thereby reducing potential damage. Furthermore, steel rebars enhance the overall structural integrity of buildings, making them more capable of withstanding seismic activities. Additionally, steel rebars can be designed and installed in a way that meets seismic design codes and standards specific to earthquake-prone regions, ensuring the safety of the structures. Overall, steel rebars are an effective and reliable choice for reinforcing buildings in earthquake-prone regions.
- Q: What are the different types of steel rebars used in retaining walls?
- There are typically two types of steel rebars commonly used in retaining walls: plain round rebars and deformed rebars. Plain round rebars are smooth and have a circular cross-section, while deformed rebars have ridges or deformations on their surface to enhance bonding with the concrete. The choice between these types depends on the specific design requirements and the level of reinforcement needed for the retaining wall structure.
- Q: How are steel rebars classified based on their shapes?
- Steel rebars are classified based on their shapes into different categories such as round, square, deformed, and flat rebars.
- Q: How do steel rebars impact the constructability and formwork requirements of concrete elements?
- Steel rebars have a significant impact on the constructability and formwork requirements of concrete elements. Rebars, also known as reinforcement bars, are widely used in concrete construction to enhance the strength and durability of structural elements. Firstly, the presence of rebars affects the constructability of concrete elements by providing structural integrity and load-bearing capacity. By adding rebars in strategic locations within the concrete, such as beams, columns, and slabs, the overall strength and stability of the structure are significantly improved. This allows for the construction of larger and more complex concrete elements, as the rebars help to distribute the loads more efficiently. Moreover, rebars also impact the formwork requirements of concrete elements. Formwork refers to the temporary structure used to hold the concrete in place until it sets and gains sufficient strength to support itself. The inclusion of rebars necessitates careful consideration when designing the formwork, as the presence of reinforcement bars can increase the weight and volume of the concrete. The size, spacing, and positioning of rebars influence the formwork design and construction process. The formwork must be designed to accommodate the rebars and ensure proper concrete placement and consolidation around them. This may require additional reinforcement in the formwork, such as tie wires or supports, to prevent displacement or movement of the rebars during concrete pouring. Furthermore, rebars also impact the overall timeline and cost of the construction project. The need for additional formwork materials and reinforcement can increase both the material and labor costs. Moreover, the presence of rebars may require additional time for the formwork installation, concrete pouring, and curing process, as the rebars need to be properly positioned and secured within the concrete elements. In conclusion, steel rebars have a significant impact on the constructability and formwork requirements of concrete elements. They enhance the structural integrity of the concrete, allowing for the construction of larger and more complex elements. However, their inclusion also necessitates careful planning and design of the formwork, taking into consideration the size, spacing, and positioning of the rebars. Overall, rebars play a crucial role in ensuring the strength, stability, and longevity of concrete structures.
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HRB400 hot-rolled reinforced bar
- Ref Price:
-
- Loading Port:
- China Main Port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- -
- Supply Capability:
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