Deformed Steel Bar BS4449 GR.460B GR.B500B

Deformed Steel Bar BS4449 GR.460B GR.B500B System 1

Deformed Steel Bar BS4449 GR.460B GR.B500B

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

Min Order Qty:: 100 m.t.

Supply Capability:: 1000 m.t./month

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Specifications

Steel rebar
Price: FOB $475-535/MT
Size:6-50mm
Moq: 300tons of each size
Material: BS4449 GR460, ASTM A615, HRB400, HRB500

Steel rebar/deformed steel bar/reinforced steel bar

1.Standard: ASTM,BS,DIN,JIS,BS 4449 GR460B-1997. ASTM A615/706 GR 40/60, GB(HRB400,500)

2.Grade:HRB35, HRB400, HRB500,

3.Diameter:6-50mm

4.Length:6-12m and in coils

5.Place of Origin: Tangshan, China (Mainland)

6.Brand Name: CNBM

7.Material: cabon steel

8.Color: black

9.Packing: bundles or as per the buyers' requirement.

10. Minimum Order Quantity: 500 MTS as per size.

11. Payment terms: TT or LC at sight.

12. Delivery time: within 25-30 days after down payment or L/C received.

13. Application: Construction,Bridge Building, Road Building

Q:What is the difference between carbon steel and stainless steel rebars?: The main difference between carbon steel and stainless steel rebars lies in their composition and corrosion resistance. Carbon steel rebars are made primarily of iron and carbon, while stainless steel rebars contain iron, chromium, and other alloying elements like nickel and molybdenum. Carbon steel rebars are more susceptible to corrosion compared to stainless steel rebars, especially in environments with high moisture or exposure to chemicals. Stainless steel rebars, on the other hand, have a higher resistance to corrosion due to the presence of chromium, which forms a protective oxide layer on the surface. This makes stainless steel rebars suitable for applications in harsh or corrosive environments, such as marine structures or concrete exposed to chloride ions. Additionally, stainless steel rebars have higher tensile strength and ductility compared to carbon steel rebars. This makes them more suitable for structural applications where high strength and durability are required. Overall, the choice between carbon steel and stainless steel rebars depends on the specific application and the level of corrosion resistance and strength needed.

Q:What are the guidelines for proper splicing of steel rebars in concrete structures?: The guidelines for proper splicing of steel rebars in concrete structures are essential to ensure the structural integrity and safety of the building. Here are some key guidelines to follow: 1. Length of Lap Splicing: The length of lap splicing refers to the overlapping distance between two rebars. It is crucial to follow the specified length mentioned in the design plans or structural codes. Typically, the minimum lap length for rebars is specified as a certain multiple of their diameter, such as 40 times the diameter for tension members and 25 times the diameter for compression members. 2. Cleanliness: Before splicing the rebars, the surfaces of the bars must be cleaned thoroughly to remove any rust, scale, dirt, or other contaminants. Proper cleaning ensures a strong bond between the bars during the splicing process. 3. Proper Alignment: The rebars being spliced should be properly aligned to maintain the continuity of the reinforcement. Misalignment can lead to stress concentration, weakening the overall structure. The bars should be aligned in a straight line, ensuring that they are parallel and evenly spaced. 4. Splice Type: There are various types of splice connections available, such as lap splicing, mechanical splicing, and welded splicing. The choice of splice type should be based on the specific project requirements, structural design, and local building codes. 5. Reinforcement Bar Preparation: The rebars need to be prepared before splicing by removing any scale, rust, or other contaminants. This can be done through brushing, grinding, or shot blasting. Additionally, the ends of the rebars should be clean and free of any deformations or irregularities. 6. Testing and Inspection: It is crucial to conduct regular testing and inspection to ensure the quality and integrity of the spliced rebars. Non-destructive testing methods, such as ultrasound or magnetic particle testing, can be employed to check the bond strength and ensure the splicing has been done correctly. 7. Adequate Cover: The spliced rebars must have adequate concrete cover to protect them from corrosion and fire. The thickness of concrete cover should comply with the local building codes and design specifications. 8. Proper Grouting: If mechanical splices are used, it is important to ensure proper grouting or filling of the splice sleeve or coupler with an approved non-shrink grout. This helps in achieving full load transfer and prevents any movement or slippage of the rebars. 9. Documentation: All splicing activities should be properly documented, including the type of splice used, lap lengths, inspection reports, and any deviations from the original design. This documentation is important for future reference, maintenance, and to ensure compliance with regulatory agencies. It is important to note that these guidelines are general recommendations, and specific project requirements and local building codes should always be followed for proper splicing of steel rebars in concrete structures. Consulting with a qualified structural engineer or following the advice of a reputable construction professional is crucial to ensure the highest standards of safety and compliance.

Q:How do steel rebars prevent the concrete from cracking under tension?: Steel rebars reinforce concrete and increase its structural integrity, preventing cracking under tension. Concrete has low tensile strength and tends to crack when subjected to tensile forces. However, when steel rebars are embedded in the concrete, they absorb and distribute these forces, acting as reinforcement. Typically made of high-strength steel, the rebars have a much higher tensile strength compared to concrete. As a result, when the concrete is under tension, the rebars bear most of the load, preventing cracking. The rebars act as a framework or skeleton within the concrete, resisting the tensile forces and ensuring its structural stability. Furthermore, the bond between the steel rebar and the concrete also plays a role in preventing cracking under tension. The ribbed or deformed surface of the rebars enhances the bond with the surrounding concrete, creating a strong connection. This bond allows the rebars to transfer the tensile forces to the concrete matrix more effectively, reducing the risk of cracking. By reinforcing the concrete, steel rebars help distribute the tensile forces evenly throughout the structure. This prevents localized stress concentrations and minimizes the chances of cracks forming. Additionally, if cracks do occur, the presence of rebars can help control their propagation by acting as barriers that restrict further spread. In conclusion, steel rebars provide reinforcement, increase the strength of concrete, and prevent cracking under tension. They bear the tensile forces, distribute them evenly, and enhance the bond between the rebar and the concrete. This reinforcement ensures the structural integrity of the concrete and helps prevent cracking.

Q:How do steel rebars affect the overall constructability of a project?: The overall constructability of a project is greatly influenced by steel rebars. These rebars, also known as reinforcing bars, play a vital role in improving the strength, durability, and stability of concrete structures. They are essential in mitigating the tensile forces that concrete alone cannot bear, thereby increasing the overall load-bearing capacity of the structure. To begin with, steel rebars simplify the construction process by providing a framework for pouring and shaping concrete. They serve as a skeletal structure that holds the concrete in place during the curing process, ensuring proper setting and desired shaping. This contributes to the efficiency of construction projects, allowing for faster concrete placement and reducing the risk of structural deformities. Furthermore, rebars enhance the structural integrity of the project. By reinforcing the concrete, they enhance its ability to resist cracking, bending, and breaking under different loads and environmental conditions. This added strength and resilience make the structure more durable and reduce the need for frequent repairs or maintenance, ultimately saving time and costs in the long term. In addition to strength and durability, steel rebars also contribute to the constructability of a project by enabling flexibility in design. Architects and engineers have the freedom to create complex and innovative structures, such as high-rise buildings, bridges, and tunnels, that require high load-bearing capacities. The versatility of rebars allows for the construction of structures with unique shapes, curves, and spans, expanding the possibilities of architectural design. Moreover, steel rebars facilitate constructability by enabling the construction of large-scale projects. They allow for the creation of reinforced concrete elements, such as columns, beams, and slabs, capable of supporting heavy loads and distributing them evenly throughout the structure. This capability is particularly crucial for projects that require significant weight-bearing capacity, such as industrial buildings or infrastructure projects. In conclusion, steel rebars have a profound impact on the constructability of a project. They simplify the construction process, enhance structural integrity, enable flexibility in design, and facilitate the construction of large-scale projects. By incorporating rebars into concrete structures, construction professionals can ensure that their projects are stronger, more durable, and better equipped to withstand various loads and environmental conditions.

Q:How do steel rebars affect the thermal properties of a structure?: Steel rebars, which are commonly used in reinforced concrete structures, can have a significant impact on the thermal properties of a building or structure. Firstly, steel has a higher thermal conductivity compared to concrete. This means that when steel rebars are embedded within concrete, they can act as thermal bridges, allowing heat to transfer more easily through the structure. This can result in increased heat loss during colder months and increased heat gain during warmer months, leading to higher energy consumption for heating and cooling. Secondly, steel rebars can affect the thermal expansion and contraction of the structure. Steel has a higher coefficient of thermal expansion compared to concrete, meaning it expands and contracts more with changes in temperature. This differential movement between the steel rebars and the surrounding concrete can lead to cracks and structural deformations, which can compromise the overall thermal performance of the structure. Furthermore, steel rebars can also influence the moisture behavior of a structure. Steel has a higher thermal conductivity than concrete, as mentioned earlier, but it also has a higher electrical conductivity. This electrical conductivity can promote the corrosion of steel rebars when they come into contact with moisture or water. Corrosion can lead to the formation of rust, which expands and can further damage the surrounding concrete. This can result in increased moisture ingress, compromising the insulation properties of the structure and potentially leading to mold growth and other moisture-related issues. In conclusion, steel rebars have both direct and indirect impacts on the thermal properties of a structure. They can act as thermal bridges, affecting heat transfer, and their differential thermal expansion and corrosion potential can compromise the overall thermal performance and moisture behavior of the structure. Proper design, insulation, and corrosion protection measures should be taken into consideration to mitigate these effects and ensure optimal thermal performance.

Q:Can steel rebars be used in road construction projects?: Yes, steel rebars can be used in road construction projects. They are commonly used as reinforcement in concrete structures, including roads and bridges, to enhance their strength and durability.

Q:What is the maximum diameter of steel rebars used in residential construction?: The maximum diameter of steel rebars typically used in residential construction ranges from 12 to 20 millimeters.

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:What are the main uses of steel rebars?: Steel rebars, also known as reinforcing bars, are primarily used in construction and civil engineering projects to provide strength and stability to concrete structures. The main uses of steel rebars include: 1. Reinforcing Concrete: Steel rebars are embedded within concrete structures to enhance their tensile strength. Concrete is excellent at withstanding compressive forces, but it is weak in tension. By adding rebars, the composite material formed (reinforced concrete) can resist both compressive and tensile forces, making it suitable for various applications such as building columns, beams, slabs, and foundations. 2. Structural Stability: Steel rebars play a crucial role in enhancing the structural stability of buildings and infrastructure. They help distribute the load evenly across the structure, preventing cracks, sagging, or collapse. By reinforcing concrete elements with rebars, structures can withstand heavy loads, seismic activity, and other external forces. 3. Bridges and Highways: Steel rebars are extensively used in the construction of bridges and highways. Bridges, being subjected to significant loads and harsh environmental conditions, require strong and durable reinforcement. Steel rebars ensure the longevity and structural integrity of these critical infrastructure projects. 4. Retaining Walls and Tunnels: Retaining walls are designed to hold back soil or other materials and prevent erosion. Steel rebars are commonly used to reinforce these structures, enabling them to withstand the lateral pressures exerted by the retained material. Similarly, in tunnel construction, rebars provide strength to the concrete lining, ensuring stability and preventing collapse. 5. Foundations: Steel rebars are a vital component in the construction of building foundations. They help distribute the weight of the structure evenly to the ground, preventing settlement or sinking. Moreover, rebars help anchor the foundation to the ground, providing stability against soil movement or seismic forces. 6. Pre-stressed and Post-tensioned Concrete: In pre-stressed and post-tensioned concrete construction, steel rebars are used to introduce compressive forces into the concrete members. This technique enhances the structural performance by reducing tensile stress, increasing load-bearing capacity, and minimizing cracking. 7. Masonry Reinforcement: Steel rebars are also utilized to reinforce masonry structures like walls, columns, and arches. By embedding rebars within the mortar joints or cores, the overall strength and stability of the masonry system are improved, allowing it to resist lateral loads and seismic forces. In summary, steel rebars are indispensable in modern construction, providing strength, stability, and durability to concrete structures. With their ability to resist tensile forces, they ensure the safety and longevity of buildings, bridges, highways, tunnels, and other essential infrastructure projects.

Q:Are there any specific safety measures to be taken while working with steel rebars?: Yes, there are specific safety measures that should be followed when working with steel rebars. These include wearing appropriate personal protective equipment (PPE) such as gloves, safety glasses, and steel-toed boots to protect against cuts, punctures, and falling objects. It is important to handle rebars with care to avoid injuries, use proper lifting techniques, and ensure they are securely stored to prevent accidents. Additionally, workers should be trained on safe work practices and be aware of potential hazards such as tripping, impalement, and exposure to hazardous substances during cutting or welding processes. Regular inspections of equipment and work areas are also essential to maintain a safe working environment.

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