GB Standard HRB400 Steel Deformed Bar 28mm/32mm
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT or LC
- Min Order Qty:
- 50 m.t
- Supply Capability:
- 20000 m.t/month
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GB Standard HRB400 Steel Deformed Bar 28mm/32mm
Description:
-Standard: GB
-Material: HRB400
-Specification:
| Diameter(mm) | Section Area(mm2) | Mass(Kg/m) | Length(m) |
| 28 | 615.8 | 4.83 | 9, 12 or as customs' request |
| 32 | 804.2 | 6.31 | 9, 12 or as customs' request |
Chemical Composition(%) of GB Standard HRB400 Steel Deformed Bar 28mm/32mm:
| C | Mn | Si | S | P | V |
| ≤0.25 | ≤1.60 | ≤0.08 | ≤0.045 | ≤0.045 | 0.04-0.12 |
Mechanical Properties of GB Standard HRB400 Steel Deformed Bar 28mm/32mm:
Yield Strength (N/cm²) | Tensile Strength (N/cm²) | Elongation (%) |
≥400 | ≥570 | ≥14 |
Usage and Applications of GB Standard HRB400 Steel Deformed Bar 28mm/32mm:
Deformed bar is widely used in buildings, bridges, roads and other engineering construction. Big to highways, railways, bridges, culverts, tunnels, public facilities such as flood control, dam, small to housing construction, beam, column, wall and the foundation of the plate, deformed bar is an integral structure material. With the development of world economy and the vigorous development of infrastructure construction, real estate, the demand for deformed bar will be larger and larger.
Packaging & Delivery of GB Standard HRB400 Steel Deformed Bar 28mm/32mm:
Packaging Detail: products are packed in bundle and then shipped by container or bulk vessel, deformed bar is usually naked strapping delivery, when storing, please pay attention to moisture proof. The performance of rust will produce adverse effect.
Each bundle weight: 2-3MT, or as required
Payment term: TT or L/C
Delivery Detail: within 45 days after received advanced payment or LC.
Label: to be specified by customer, generally, each bundle has 1-2 labels
Trade terms: FOB, CFR, CIF
Images of GB Standard HRB400 Steel Deformed Bar 28mm/32mm:
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- Q:What are the different types of steel rebars used in retaining walls?
- There are several types of steel rebars commonly used in retaining walls, including plain round bars, deformed bars, epoxy-coated bars, and galvanized bars. Plain round bars are smooth and typically used in low-load applications. Deformed bars have ribs or indentations that provide better adhesion with the concrete, making them suitable for high-load situations. Epoxy-coated bars have a protective coating that prevents corrosion and are often used in marine or corrosive environments. Galvanized bars are coated with a layer of zinc to enhance their resistance to rust and are commonly employed in areas with high moisture content. The choice of rebar type depends on the specific requirements of the retaining wall project.
- Q:What is the difference between grade two and three grade steel?
- The grade two steel is HRB335, and the grade three steel is HRB400.
- Q:How do steel rebars affect the overall weight of a concrete structure?
- Steel rebars are an essential component in reinforcing concrete structures, and they play a significant role in determining the overall weight of the structure. Rebars are typically made of carbon steel, which is known for its high strength and durability. When mixed with concrete, rebars provide tensile strength to counterbalance the concrete's compressive strength. The addition of steel rebars to a concrete structure increases its weight. However, the impact on the overall weight is relatively minimal compared to the benefits they provide. The weight of steel rebars is significantly lower than that of concrete, but their inclusion does contribute to the total weight. The primary purpose of steel rebars is to reinforce the concrete, ensuring that it can bear the loads and stresses imposed on the structure. By distributing the tensile forces throughout the concrete, rebars prevent cracking and structural failure. This reinforcement allows for the construction of larger and more robust structures, such as bridges, buildings, and highways. Although the weight of steel rebars increases the overall weight of a concrete structure, it is a necessary trade-off for enhanced strength and durability. The additional weight from the rebars is typically insignificant compared to the weight of the concrete itself. Moreover, the increased weight is often negligible when considering the overall load-bearing capacity and structural integrity of the entire construction. In summary, steel rebars contribute to the overall weight of a concrete structure, but the impact is relatively minor compared to the benefits they provide. The reinforcement provided by rebars ensures the structural integrity and durability of the concrete while allowing for the construction of larger, safer, and more resilient structures.
- Q:How do steel rebars impact the overall energy efficiency of a structure?
- Steel rebars can have both positive and negative impacts on the overall energy efficiency of a structure. On one hand, steel rebars can enhance the structural integrity and durability of the building, leading to a longer lifespan and reduced energy consumption for repairs and maintenance. Additionally, steel rebars can be used to reinforce concrete, which provides better insulation and thermal efficiency. On the other hand, the production of steel rebars requires significant energy and emits greenhouse gases, contributing to the carbon footprint of the structure. Therefore, the overall energy efficiency of a structure depends on various factors, including the design, construction techniques, and the use of sustainable materials alongside steel rebars.
- Q:Can steel rebars be used in the construction of industrial facilities?
- Yes, steel rebars can be used in the construction of industrial facilities. Steel rebars provide strength and reinforcement to concrete structures, making them suitable for heavy-duty applications in industrial settings. These rebars are commonly used in the construction of industrial buildings, warehouses, factories, power plants, and other similar facilities to ensure the structural integrity and durability of the infrastructure.
- Q:What is the effect of welding defects on the performance of steel rebars?
- The performance of steel rebars can be significantly affected by welding defects, which can weaken their structural integrity and compromise the overall strength and durability of the construction project. Porosity is one of the common welding defects, caused by the presence of gas pockets or voids in the weld. This weakens the weld joint, reducing its load-bearing capacity and making it more prone to cracking or breaking under stress. As a result, the rebars may not be able to resist external forces, such as the weight of the structure or seismic activities, potentially leading to collapse or structural failure. Another welding defect is lack of fusion, which happens when there is insufficient bonding between the base metal and the weld metal. This creates a weak joint that can easily separate or crack under load. Lack of fusion can decrease mechanical strength and compromise structural performance as the rebars may not be able to withstand the expected load or forces. Additionally, the presence of weld spatter or excessive weld reinforcement can also have a negative impact on the performance of steel rebars. Weld spatter refers to undesirable splashes or droplets of molten metal that can stick to the rebar's surface, creating potential weak points. Excessive weld reinforcement adds unnecessary weight to the rebar and creates stress concentrations, further increasing the risk of failure. In conclusion, welding defects can significantly affect the performance of steel rebars by weakening their structural integrity, reducing load-bearing capacity, and increasing the likelihood of cracking or breaking under stress. Therefore, it is crucial to implement proper welding techniques and quality control measures to minimize or eliminate these defects and ensure the safety and reliability of the construction project.
- Q:How do steel rebars contribute to the crack control in slabs and walls?
- Steel rebars contribute to crack control in slabs and walls by providing reinforcement and increasing the structural strength of the concrete. When concrete is subjected to tensile forces, such as shrinkage, temperature variations, or external loads, it has a tendency to crack. However, the presence of steel rebars within the concrete helps to distribute these forces and resist the formation and propagation of cracks. The rebars act as reinforcement, absorbing and transferring the tensile stress, thus preventing the concrete from cracking and enhancing the overall durability and integrity of the structure.
- Q:How do steel rebars affect the overall fire resistance of concrete structures?
- Steel rebars can significantly improve the fire resistance of concrete structures. The high thermal conductivity of steel helps in dissipating heat away from the concrete, preventing rapid temperature rise and structural failure. Additionally, the presence of rebars enhances the load-bearing capacity of the structure during a fire, enabling it to withstand the intense heat for a longer duration before collapsing.
- Q:What are the safety measures to consider while handling steel rebars?
- When handling steel rebars, there are several safety measures that should be considered to minimize the risk of accidents or injuries. These measures include: 1. Personal Protective Equipment (PPE): Always wear the necessary PPE, which may include safety glasses, steel-toe boots, gloves, and a hard hat. This will protect you from potential hazards such as falling rebars, sharp edges, or flying debris. 2. Proper Lifting Techniques: When lifting rebars, use proper lifting techniques to avoid straining your back or causing injury. Bend your knees, keep your back straight, and lift with your leg muscles, rather than your back. 3. Secure Storage: Store steel rebars in a secure and organized manner to prevent them from falling or rolling onto someone. Stack them in a stable manner and use support structures if necessary. 4. Communication and Signage: Ensure clear communication between workers involved in rebars handling. Use hand signals or verbal cues to avoid accidents. Additionally, place safety signs or warning labels in the area to indicate potential hazards or restricted access. 5. Proper Tools and Equipment: Use appropriate tools and equipment specifically designed for handling steel rebars. This may include lifting clamps, rebars benders, or cutting tools. Inspect and maintain these tools regularly to ensure their proper functioning. 6. Inspection and Removal of Defective Rebars: Inspect steel rebars for any defects, such as cracks, rust, or damage, before using them. Defective rebars should be removed and replaced with new ones to ensure structural integrity. 7. Secure Work Area: Maintain a clean and clutter-free work area to prevent tripping hazards and provide enough space for maneuvering. Keep the work area well-lit and free from obstacles or other potential hazards. 8. Training and Supervision: Provide proper training to workers involved in handling rebars, ensuring they are aware of the safety protocols and best practices. Regularly supervise their work to identify any unsafe practices and provide guidance or corrective actions. By following these safety measures, the risk of accidents and injuries while handling steel rebars can be significantly reduced, resulting in a safer work environment.
- Q:What are the common problems associated with steel rebars in construction?
- There are several common problems associated with steel rebars in construction. One of the main issues is corrosion. Steel rebars are susceptible to rusting when exposed to moisture and oxygen, especially in humid or coastal environments. This can compromise the integrity of the rebars and weaken the overall structure. Another problem is improper installation. If rebars are not positioned correctly or are not adequately secured, they may not provide the necessary reinforcement and support. This can lead to structural failures and safety hazards. Additionally, the size and spacing of rebars can be a concern. If the rebars are too small or spaced too far apart, they may not effectively distribute loads or resist bending and cracking. On the other hand, if the rebars are too large or placed too close together, it can increase construction costs and make the concrete mix difficult to work with. Another challenge is the potential for poor bonding between the rebar and the concrete. If there is inadequate contact or bonding between the two materials, it can compromise the structural integrity and reduce the load-bearing capacity of the reinforced concrete. Lastly, the quality of the steel rebars themselves can be an issue. Low-quality or substandard rebars may have defects, such as impurities or inconsistencies in their composition, which can weaken the reinforcement and compromise the overall strength of the structure. To mitigate these problems, it is important to use high-quality rebars, follow proper installation techniques, and ensure proper maintenance and protection against corrosion. Regular inspections and testing can also help identify any issues and ensure the longevity and safety of the reinforced concrete structure.
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GB Standard HRB400 Steel Deformed Bar 28mm/32mm
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT or LC
- Min Order Qty:
- 50 m.t
- Supply Capability:
- 20000 m.t/month
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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