GB Standard HRB400 Steel Deformed Bar 22mm/25mm
- 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 22mm/25mm
Description:
-Standard: GB
-Material: HRB400
-Specification:
| Diameter(mm) | Section Area(mm2) | Mass(Kg/m) | Length(m) |
| 22 | 380.1 | 2.98 | 9, 12 or as customs' request |
| 25 | 490.9 | 3.85 | 9, 12 or as customs' request |
Chemical Composition(%) of GB Standard HRB400 Steel Deformed Bar 22mm/25mm:
| 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 22mm/25mm:
Yield Strength (N/cm²) | Tensile Strength (N/cm²) | Elongation (%) |
≥400 | ≥570 | ≥14 |
Usage and Applications of GB Standard HRB400 Steel Deformed Bar 22mm/25mm:
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 22mm/25mm:
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 22mm/25mm:
*If you would like to get our price, please inform us the size, standard/material and quantity. Thank you very much for your attention.
- Q: What is the role of steel rebars in preventing shrinkage cracks in concrete?
- Steel rebars play a crucial role in preventing shrinkage cracks in concrete. Shrinkage cracks occur in concrete due to the natural drying and curing process, as the water content in the concrete evaporates and the material contracts. These cracks can compromise the structural integrity and durability of the concrete. The inclusion of steel rebars in concrete helps to mitigate shrinkage cracks by providing tensile strength. While concrete is strong in compression, it is weak in tension. During the drying process, the rebars act as reinforcement, resisting the tensile forces that develop as the concrete shrinks. This prevents the formation and propagation of shrinkage cracks. The rebars act as a framework or skeleton within the concrete, distributing the tensile stresses and preventing them from concentrating in one area. By restraining the shrinkage of the concrete, the rebars help to maintain the overall integrity and stability of the structure. In addition, steel rebars also enhance the overall strength and load-bearing capacity of the concrete. By adding reinforcement, the concrete becomes more resistant to bending, shearing, and other forces that can lead to cracking. Furthermore, the presence of rebars in concrete also helps to control the width and depth of any cracks that may still occur. By confining and limiting the size of cracks, the rebars prevent them from expanding and potentially compromising the structural integrity of the concrete. In summary, steel rebars play a crucial role in preventing shrinkage cracks in concrete by providing tensile strength, distributing the stresses, enhancing overall strength, and controlling the size of cracks. Their inclusion in concrete ensures a more durable and reliable structure, minimizing the risk of damage and maintaining the longevity of the concrete.
- Q: Can steel rebars be used in the construction of sports facilities?
- Yes, steel rebars can be commonly used in the construction of sports facilities. Steel rebars provide reinforcement and strength to concrete structures, making them suitable for the construction of sports facilities such as stadiums, arenas, and gymnasiums. They help improve the structural integrity and durability of these facilities, ensuring they can withstand heavy loads, vibrations, and impacts, which are often encountered during sports events.
- Q: What are the advantages of using epoxy-coated steel rebars?
- There are several advantages to using epoxy-coated steel rebars in construction projects. Firstly, epoxy coating provides excellent corrosion resistance. Steel rebars are prone to corrosion when exposed to moisture, oxygen, and other environmental elements. The epoxy coating acts as a protective barrier, preventing these elements from reaching the surface of the steel and thus reducing the risk of corrosion. This significantly extends the lifespan of the rebars and enhances the overall durability of the structure. Secondly, epoxy-coated steel rebars offer improved bonding strength. The epoxy coating provides a rough surface that enhances the adhesive properties between the rebar and the concrete. This results in better load transfer, ultimately strengthening the structure. The increased bonding strength also helps in reducing cracking and enhancing the overall structural integrity. Another advantage of epoxy-coated steel rebars is their ability to resist chemical attack. In certain environments where structures are exposed to chemicals or aggressive substances, such as wastewater treatment plants or industrial facilities, the epoxy coating acts as a barrier that prevents these chemicals from directly contacting the steel. This helps in preserving the rebars and maintaining the structural integrity over the long term. Additionally, epoxy-coated steel rebars provide easier handling and installation. The smoothness of the epoxy coating reduces friction between the rebar and other construction materials, making it easier to position and place the rebars accurately. This simplifies the construction process, enhances productivity, and reduces labor costs. Lastly, epoxy-coated steel rebars offer aesthetic benefits. The epoxy coating can be customized to various colors, allowing for better visual integration with architectural designs. This is particularly useful in projects where the rebars are exposed and visible, such as bridges or artistic structures. In conclusion, the advantages of using epoxy-coated steel rebars include corrosion resistance, improved bonding strength, chemical resistance, easier handling and installation, and aesthetic benefits. By using epoxy-coated steel rebars, construction projects can benefit from enhanced durability, reduced maintenance costs, and improved structural performance.
- Q: How are steel rebars bent on-site?
- Steel rebars are typically bent on-site using specialized machinery called rebar benders. These machines are designed to provide the necessary force and precision to bend the rebars to the desired shape and angle. The process starts by measuring and marking the location where the rebar needs to be bent. Then, the rebar is placed into the rebar bender, which is equipped with adjustable rollers and bending arms. The rollers help guide the rebar through the bending process, while the bending arms apply force to gradually bend the rebar to the desired angle and shape. The operator of the rebar bender carefully adjusts the rollers and bending arms to ensure the correct bend radius and angle are achieved. This requires skill and experience to ensure the rebars are bent accurately according to the construction plans and specifications. Once the rebar has been bent to the desired shape, it is then securely fastened in place using tie wire or rebar clips. This ensures that the rebars maintain their shape and position during the concrete pouring process. Bending rebars on-site offers several advantages. Firstly, it allows for greater flexibility and adaptability during construction, as rebars can be customized and adjusted to fit specific design requirements. Secondly, on-site bending minimizes transportation and storage costs, as rebars can be delivered in longer lengths and bent as needed. Lastly, on-site bending saves time and improves construction efficiency, as rebars can be bent and installed immediately, eliminating the need for off-site fabrication and transportation delays. Overall, steel rebars are bent on-site using specialized rebar benders, which provide the necessary force and precision to bend the rebars to the desired shape and angle. This process offers flexibility, cost savings, and improved construction efficiency.
- Q: How do steel rebars affect the durability of concrete structures?
- Steel rebars play a crucial role in enhancing the durability of concrete structures. By reinforcing the concrete, rebars help to increase its tensile strength, which is otherwise low compared to its compressive strength. This is crucial because concrete is highly effective in resisting compressive forces, but it is weak in withstanding tension or bending forces. When concrete structures are subjected to external forces like vibrations, wind, or earthquakes, the rebars absorb the tension and bending forces, preventing the concrete from cracking or collapsing. This ensures that the structure remains intact and stable. Without the presence of steel rebars, concrete structures would be more prone to damage and failure under such circumstances. Additionally, steel rebars also enhance the durability of concrete structures by preventing corrosion. When embedded in concrete, rebars act as a protective barrier against moisture and oxygen, which are primary agents that lead to the corrosion of steel. By preventing the penetration of these harmful elements, rebars significantly extend the lifespan of the concrete structure. Moreover, steel rebars provide dimensional stability to concrete structures. As concrete tends to shrink and expand due to temperature changes and moisture variations, the presence of rebars helps to counteract these movements. This prevents cracks from forming and ensures the structural integrity of the concrete. In summary, steel rebars greatly enhance the durability of concrete structures by increasing their tensile strength, preventing cracking and collapse, protecting against corrosion, and providing dimensional stability. Their presence is essential for constructing long-lasting and reliable concrete structures that can withstand various external forces and environmental conditions.
- Q: How do steel rebars perform in fire-resistant constructions?
- Steel rebars perform well in fire-resistant constructions due to their high melting point and thermal conductivity. They can withstand high temperatures for an extended period without significant deformation or loss of strength. This makes them suitable for reinforcing concrete structures in fire-prone areas, providing stability and structural integrity during a fire. Additionally, the thermal conductivity of steel helps to dissipate heat, reducing the risk of localized temperature increases that could compromise the overall fire resistance of the construction.
- Q: What are the different grades of steel rebars used in bridge construction?
- The construction of bridges requires the use of different grades of steel rebars, which are selected based on the specific demands and load-bearing capacities of the structure. The following are the most frequently employed grades of steel rebars in bridge construction: 1. Grade 40: This is the lowest grade of steel rebar utilized in bridge construction. It possesses a minimum yield strength of 40,000 pounds per square inch (psi). Grade 40 steel rebars are typically employed for lighter loads and smaller bridge structures. 2. Grade 60: This is the grade of steel rebar most commonly used in bridge construction. It boasts a minimum yield strength of 60,000 psi. Grade 60 steel rebars are suitable for medium to heavy loads and are frequently employed in bridge piers, girders, and deck slabs. 3. Grade 75: This grade of steel rebar possesses a minimum yield strength of 75,000 psi. Grade 75 steel rebars are employed for heavy loads and large bridge structures that necessitate greater strength. They are commonly utilized in the construction of high-rise bridges and long-span structures. 4. Grade 80 and Grade 100: These are high-strength steel rebars with minimum yield strengths of 80,000 psi and 100,000 psi, respectively. These grades of steel rebars are used in specialized bridge construction projects that require exceptional strength and durability. They are commonly employed in the construction of cable-stayed bridges and suspension bridges. It is worth noting that the selection of the appropriate grade of steel rebar for bridge construction relies on various factors, including anticipated loads, span length, design specifications, and local building codes. Consulting with structural engineers and adhering to recommended guidelines ensures the utilization of the appropriate grade of steel rebar, thereby guaranteeing the safety and longevity of the bridge structure.
- Q: What are the common quality control tests for steel rebars?
- Steel rebars undergo several quality control tests to ensure they meet industry standards and specifications. These tests assess the rebars' physical, mechanical, and chemical properties to guarantee their durability and performance. Common quality control tests for steel rebars include: 1. Tensile Test: This test determines the rebars' tensile strength, yield strength, and elongation. It involves gradually applying force to the rebar until it breaks, measuring the maximum force it can withstand. 2. Bend Test: This test evaluates the rebars' ability to withstand bending without cracking. The rebar is bent to a specific angle and inspected for visible cracks. 3. Chemical Composition Analysis: This test determines the rebars' chemical composition, ensuring they meet required standards. It involves analyzing the levels of carbon, manganese, phosphorus, sulfur, and other elements. 4. Visual Inspection: This test visually examines the rebars for surface defects like cracks or irregularities that could impact structural integrity. 5. Dimensional Inspection: This test verifies the rebars' dimensions and shape, checking for deviations from specified requirements. Instruments are used to measure diameter, length, and shape. 6. Weldability Test: If the rebars will be welded, a test is performed to assess their suitability for welding. The quality of the weld joint, including strength and brittleness, is evaluated. 7. Corrosion Resistance Test: This test determines the rebars' resistance to corrosion, which is crucial for long-term durability. It involves subjecting the rebars to accelerated corrosion conditions and assessing their resistance. These tests are essential in ensuring the quality and reliability of steel rebars used in construction projects. Manufacturers and inspectors can identify non-compliant or substandard rebars through these tests, ensuring the safety and structural integrity of buildings and infrastructure.
- Q: How do steel rebars impact the overall construction cost estimation process?
- Steel rebars have a significant impact on the overall construction cost estimation process. These reinforcing bars are crucial components in reinforced concrete structures, providing strength and durability to the building. As such, their inclusion in cost estimation is essential for accurately assessing the total project cost. Firstly, steel rebars contribute to the material cost of the construction project. Since rebars are typically priced based on weight, the quantity and size of rebars required for the structure directly affect the material cost estimation. The accurate identification and quantification of rebars are necessary to ensure an appropriate budget allocation for the project. Moreover, steel rebars also influence the labor cost estimation. Installing rebars requires skilled labor, and the time and effort involved in cutting, bending, and placing the rebars must be considered. The complexity of the reinforcement design, such as intricate shapes or complex detailing, can increase labor costs. Therefore, accurate estimation of rebars allows for better planning of labor resources and cost allocation. In addition to material and labor costs, steel rebars impact other aspects of the construction cost estimation process. For instance, the weight and placement of rebars affect the structural design, which can influence the cost estimation of the concrete mix design and formwork requirements. The size and spacing of rebars may also impact the excavation and foundation costs, as well as the overall project timeline. Furthermore, steel rebars contribute to the long-term costs of the construction project. The quality and durability of rebars directly affect the lifespan and maintenance requirements of the structure. Investing in high-quality rebars can reduce future maintenance and repair costs, as well as enhance the overall life cycle cost analysis of the project. In conclusion, steel rebars have a significant impact on the overall construction cost estimation process. Accurate estimation of rebars is essential for determining the material and labor costs, as well as influencing other cost-related aspects of the project. It allows for precise budget allocation, resource planning, and consideration of long-term costs, ultimately leading to a more reliable and comprehensive construction cost estimation.
- Q: What are the different types of coating for steel rebars?
- There are several different types of coatings that can be applied to steel rebars, including epoxy, zinc, and galvanized coatings. Epoxy coatings provide a protective barrier against corrosion and can be applied as a liquid or powder. Zinc coatings, such as hot-dip galvanizing, involve immersing the steel rebar in molten zinc, forming a durable protective layer. Galvanized coatings involve a similar process but typically use a thinner layer of zinc. These coatings help to extend the lifespan of the steel rebar and prevent corrosion.
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GB Standard HRB400 Steel Deformed Bar 22mm/25mm
- 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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