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: Can steel rebars be used in earthquake-prone regions?
- Yes, steel rebars can be used in earthquake-prone regions. Steel rebars are commonly used in the construction of reinforced concrete structures to enhance their strength and provide resistance against seismic forces. The flexibility and ductility of steel make it an ideal material for earthquake-resistant construction. Properly designed and installed steel rebars can improve the structural integrity and overall performance of buildings in earthquake-prone areas.
- Q: What is the lifespan of steel rebars in marine structures?
- The lifespan of steel rebars in marine structures can vary depending on various factors such as the quality of the steel, the environment in which they are exposed, and the maintenance practices employed. However, properly designed, constructed, and maintained marine structures with steel rebars can typically have a lifespan of 50 to 100 years. Steel rebars used in marine structures are generally coated with corrosion-resistant materials, such as epoxy or zinc, to protect them from the harsh marine environment. These coatings provide an additional layer of defense against corrosion, extending the lifespan of the rebars. However, it is important to note that the marine environment is highly corrosive due to the presence of saltwater, humidity, and other corrosive agents. Over time, these factors can lead to the degradation of the protective coatings and the exposure of the rebars to corrosion. If adequate maintenance measures are not taken, such as regular inspections, cleaning, and reapplication of protective coatings, the rebars may experience accelerated corrosion and their lifespan may be shortened. Additionally, the design and construction of marine structures play a crucial role in determining the lifespan of steel rebars. Proper considerations must be given to factors such as structural design, material selection, and detailing to minimize the risk of corrosion and ensure the longevity of the rebars. In summary, the lifespan of steel rebars in marine structures can range from 50 to 100 years, depending on factors such as the quality of the steel, the environmental conditions, and the maintenance practices employed. Proper design, construction, and maintenance are essential to maximizing the lifespan of steel rebars in marine structures.
- Q: What are the guidelines for proper placement of steel rebars in concrete structures?
- The guidelines for proper placement of steel rebars in concrete structures include ensuring that rebars are properly positioned and supported within the concrete to provide adequate reinforcement. This involves following the specified spacing, cover, and lap length requirements as outlined in the structural design drawings. Additionally, rebars should be properly tied and secured to maintain their position during the concrete pouring process. Adherence to these guidelines is crucial to ensure the structural integrity and durability of the concrete structure.
- Q: What are the different methods for reinforcing concrete with steel rebars?
- There are several methods for reinforcing concrete with steel rebars, each serving a specific purpose and providing different levels of strength and durability. 1. Traditional Reinforcement: This method involves placing steel rebars horizontally and vertically within the concrete structure. The rebars are typically arranged in a grid pattern and tied together at intersections using wire or metal ties. This method is commonly used for general reinforcement in slabs, walls, and columns. 2. Pre-stressed Reinforcement: In this method, steel rebars are pre-tensioned before they are embedded in the concrete. This is done by stretching the rebars using hydraulic jacks and anchoring them to the structure's foundation. The tension in the rebars helps counteract the tensile forces that occur when the concrete is subjected to loads, resulting in increased strength and resistance to cracking. 3. Post-tensioned Reinforcement: Similar to pre-stressed reinforcement, post-tensioning involves the use of steel rebars that are tensioned after the concrete has hardened. This is achieved by placing ducts or sleeves within the concrete before pouring, and then threading the rebars through them. Once the concrete has cured, the rebars are tensioned using hydraulic jacks, applying a compressive force that enhances the overall strength and load-bearing capacity of the structure. 4. Fiber Reinforced Concrete: Instead of traditional steel rebars, fibers made of steel, glass, synthetic materials, or natural fibers can be added to the concrete mix. These fibers act as a secondary reinforcement system, providing additional strength and durability to the concrete. Fiber reinforced concrete is commonly used in applications such as industrial floors, bridge decks, and pavements. 5. Shotcrete Reinforcement: Shotcrete is a method where a wet mix of concrete and steel fibers is sprayed onto a surface using a high-pressure hose. This technique is commonly used in slope stabilization, tunnel linings, and underground constructions. The steel fibers in the shotcrete provide reinforcement and improve the overall structural integrity of the sprayed concrete. Overall, the choice of reinforcement method depends on the specific requirements of the project, including the type of structure, expected loads, and desired durability. By selecting the appropriate method, engineers can ensure that the reinforced concrete structure possesses the necessary strength and resilience to withstand the intended usage and environmental conditions.
- Q: Why does the steel thread have longitudinal ribs?
- The main function of the longitudinal ribs is the force to improve the performance of the transverse ribs, the stress of support surface transverse rib in the longitudinal direction, reducing flange stress concentration, so as to improve the mechanical strength of the reinforced rib, deformation of bond between concrete and steel reinforced concrete, the collaborative work and better.The effect of the longitudinal ribs is indirect, which improves the mechanical properties of the transverse ribs and indirectly enhances the bond with the concrete.
- Q: How are steel rebars different from other types of reinforcement?
- The composition and strength of steel rebars set them apart from other types of reinforcement. Unlike fiberglass or carbon fiber, which are commonly used for reinforcement, steel rebars are made of steel, giving them exceptional strength and durability. One notable distinction between steel rebars and other reinforcement types is their capacity to withstand high tensile forces. Steel possesses a high tensile strength, allowing it to resist stretching or being pulled apart. This characteristic makes steel rebars ideal for reinforcing concrete structures that experience significant tensile loads, such as bridges, buildings, and highways. Another unique feature of steel rebars is their ability to bond effectively with concrete. The ridges or deformations on the rebars' surface enhance adhesion between the steel and concrete, facilitating efficient load transfer. This bond ensures that the concrete and steel work together as a composite material, enhancing the overall strength and structural integrity of the reinforced concrete structure. Steel rebars also offer versatility in terms of shape and size. They are available in various diameters, lengths, and shapes, including round, square, and deformed. This variety allows engineers to select the most suitable rebar type based on the specific requirements of the construction project. Moreover, steel rebars exhibit high resistance to corrosion, particularly when properly coated or protected. This corrosion resistance ensures the longevity and durability of the reinforced concrete structure, even in harsh environments or exposure to moisture. In conclusion, steel rebars stand out from other reinforcement types due to their exceptional strength, ability to withstand high tensile forces, excellent bond with concrete, versatility in shape and size, and resistance to corrosion. These qualities make steel rebars the most commonly used and preferred choice for reinforcing concrete structures in the construction industry.
- Q: Can steel rebars be used in industrial buildings?
- Yes, steel rebars can be used in industrial buildings. Steel rebars are commonly used as reinforcing materials in concrete structures, providing strength and stability. In industrial buildings, where heavy loads and high durability are required, steel rebars are often used to reinforce the concrete foundation, columns, beams, and slabs. They enhance the structural integrity of the building and ensure its ability to handle the demands of industrial operations and equipment.
- Q: What are the guidelines for the proper anchoring of steel rebars in slabs?
- The proper anchoring of steel rebars in slabs is crucial to ensure the structural integrity and strength of the concrete slab. Here are some guidelines to follow: 1. Embedment depth: The rebars should be embedded in the concrete slab to a specific depth. The depth is typically determined based on the size and strength of the rebars and the load requirements of the slab. It is important to follow the recommended embedment depth to ensure adequate transfer of forces between the rebar and the concrete. 2. Spacing: The rebars should be spaced at regular intervals within the slab to provide uniform reinforcement. The spacing is determined based on the design requirements and the expected load on the slab. Following the recommended spacing guidelines will help distribute the load evenly and prevent cracking or failure of the slab. 3. Lap length: When multiple rebars need to be joined together, a lap splice is used. The lap length is the minimum length of overlap required to ensure proper transfer of forces between the rebars. It is important to follow the specified lap length to maintain the integrity of the reinforcement. 4. Edge distance: The rebars should be placed at a certain distance from the edges of the slab to prevent edge failure. The edge distance is determined based on factors such as the bar size, concrete cover, and design requirements. Maintaining the specified edge distance will help ensure the rebars are adequately anchored and prevent concrete spalling or cracking near the edges. 5. Concrete cover: The rebars should have a minimum concrete cover to protect them from corrosion and provide fire resistance. The concrete cover is the distance between the outer surface of the rebar and the nearest concrete surface. Following the recommended concrete cover guidelines will help maintain the durability and longevity of the steel rebars. 6. Proper placement and alignment: The rebars should be accurately placed and aligned within the slab to provide effective reinforcement. They should be positioned at the correct depth, spacing, and alignment as per the design specifications. Proper placement and alignment will ensure the rebars are securely anchored and contribute to the overall strength of the slab. It is important to note that these guidelines may vary depending on the specific project requirements, local building codes, and design standards. Therefore, it is recommended to consult with a qualified structural engineer or follow the guidelines provided by relevant authorities to ensure the proper anchoring of steel rebars in slabs.
- Q: Can steel rebars be bent or shaped during construction?
- Yes, steel rebars can be bent or shaped during construction. They are commonly used in reinforced concrete structures and can be bent to fit the required design, shape, or structure.
- Q: What is the role of steel rebars in preventing concrete creep?
- Steel rebars play a crucial role in preventing concrete creep by providing reinforcement and stability to the concrete structure. The rebars act as a framework within the concrete, distributing the tensile forces and preventing the concrete from deforming or cracking over time. Additionally, steel rebars help to control the shrinkage and expansion of concrete, minimizing the potential for creep and ensuring the long-term durability and integrity of the structure.
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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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