High quality deformed bars with grade HRB400

High quality deformed bars with grade HRB400 System 1

High quality deformed bars with grade HRB400

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 100000 m.t./month

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Product Description:

Specifications of HRB400 Deformed Steel Bar:

Standard	GB	HRB400
Diameter	10mm-32mm

Length	6M, 12M
Place of origin	Hebei, China mainland
Advantages	exact size, regular package, chemical and mechanical properties are stable.
Type	Hot rolled deformed steel bar

Chemical Composition: (Please kindly find our chemistry of our material based on HRB400 as below for your information)

Grade	Technical data of the original chemical composition (%)
	C	Mn	Si	S	P		V
HRB400	≤0.25	≤1.60	≤0.80	≤0.045	≤0.045		0.04-0.12
	Physical capability
	Yield Strength (N/cm²)		Tensile Strength (N/cm²)			Elongation (%)
	≥400		≥570			≥14

Theoretical weight and section area of each diameter as below for your information:

Diameter(mm)	Section area (mm²)	Mass(kg/m)	Weight of 12m bar(kg)
18	254.5	2.00	24
20	314.2	2.47	29.64
22	380.1	2.98	35.76

Usage and Applications of HRB400 Deformed Steel Bar:

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 HRB400 Deformed Steel Bar:

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

High quality deformed bars with grade HRB400

*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 earthquake-resistant structures?: The significance of steel rebars in earthquake-resistant structures cannot be overstated. These reinforcing bars are utilized to strengthen concrete structures, increasing their strength and stability, and consequently making them more resilient against the destructive forces of earthquakes. When an earthquake occurs, the ground violently shakes, exerting immense pressure on the structure and subjecting it to significant stress. Without proper reinforcement, the concrete alone may not be able to withstand these forces, resulting in structural failure and the potential for collapse. Typically, steel rebars are embedded within the concrete, creating a strong bond. Acting as a skeleton or framework, these rebars evenly distribute the load and stress throughout the structure. They enhance the tensile strength of concrete, which is naturally weak in tension but strong in compression. By resisting bending, shearing, and tensile forces, steel rebars help prevent cracks and limit the extent of damage caused by seismic activity. Additionally, the presence of steel rebars allows for greater ductility in the structure. Ductility refers to a material's ability to deform without breaking or fracturing. In the event of an earthquake, the steel rebars can stretch and flex, absorbing and dissipating energy, thereby reducing the impact on the concrete and minimizing structural damage. The combination of rigid concrete and flexible steel rebars creates a system capable of withstanding the lateral forces and vibrations produced during an earthquake. In summary, steel rebars are indispensable in earthquake-resistant structures as they reinforce concrete, enhance its tensile strength, improve ductility, and provide overall stability. Their inclusion in the design and construction of buildings and infrastructure is imperative to ensure the safety and resilience of these structures in seismic zones.

Q: Can steel rebars be used in tunnel construction?: Yes, steel rebars can be used in tunnel construction. They are commonly used to reinforce concrete structures, including tunnel linings, to provide strength and stability to the tunnel. The rebars are embedded within the concrete to enhance its load-bearing capacity and resist the forces exerted on the tunnel walls.

Q: What is the typical lead time for ordering steel rebars?: The lead time for ordering steel rebars can vary depending on various factors, such as the quantity required, the specific grade and size needed, and the availability and location of the supplier. Typically, if the rebars are readily available and in stock, the lead time can range from a few days to a couple of weeks, assuming the supplier has the necessary inventory and transportation logistics are straightforward. However, if the rebars require special manufacturing or are in high demand, the lead time can be longer. In such cases, it may take several weeks or even months to receive the rebars, especially for large or custom orders that involve special fabrication processes or if the supplier is facing production constraints. To obtain a more accurate estimate of the lead time, it is important to communicate with the supplier and provide them with all the necessary project requirements. It is also advisable to plan ahead and place the order well in advance, particularly for projects with strict deadlines, to ensure the timely arrival of the rebars.

Q: How do steel rebars prevent corrosion in concrete structures?: Steel rebars prevent corrosion in concrete structures through a process called passivation. When rebars are embedded in concrete, the alkaline environment of the concrete causes the formation of a protective oxide layer on the surface of the steel. This oxide layer acts as a barrier, preventing the penetration of oxygen and moisture that are necessary for corrosion to occur. Additionally, rebars are often coated with epoxy or galvanized to provide an extra layer of protection against corrosion.

Q: What are the recommended practices for welding steel rebars?: To achieve a strong and reliable bond when welding steel rebars, certain recommended practices should be followed. These practices encompass: 1. Cleanliness: Prior to welding, it is crucial to ensure that the surfaces of the rebars are clean and devoid of any contaminants such as dirt, rust, or grease. Wire brushing or sandblasting can be employed to achieve a thorough cleaning. 2. Preheating: Preheating the steel rebars before welding can minimize the risk of cracking and enhance the weld's quality. The preheating temperature should be determined based on the rebar's thickness and the specific welding procedure being used. 3. Welding process: There are various welding processes suitable for steel rebars, with shielded metal arc welding (SMAW) and gas metal arc welding (GMAW) being the most commonly used. The choice of process is influenced by factors like rebar size, project requirements, and local regulations. 4. Electrodes and filler material: It is crucial to select electrodes and filler materials that are suitable for achieving a strong and durable weld. It is recommended to use materials that match the rebar's carbon content and strength. 5. Welding technique: Employing proper welding techniques, such as maintaining a consistent arc length, controlling the travel speed, and ensuring proper joint alignment, is essential for producing high-quality welds. 6. Post-weld treatment: After welding, it is important to allow the welded rebars to cool gradually to prevent thermal stress. Performing post-weld treatments, such as stress relieving, can also help minimize residual stresses and improve the weld's integrity. 7. Inspection and testing: Regular visual inspections and non-destructive testing, such as ultrasonic or magnetic particle testing, should be conducted to ensure the quality and integrity of the welded rebar joints. 8. Compliance with codes and standards: It is vital to always adhere to the relevant welding codes and standards specified by local authorities or project requirements. Compliance ensures that the welding process and quality meet the necessary specifications and safety guidelines. It should be noted that welding steel rebars should only be performed by trained and qualified personnel who possess extensive knowledge of welding techniques and safety practices. By following these recommended practices, the strength, durability, and safety of steel rebar welds can be ensured.

Q: Are there any health and safety concerns related to steel rebars?: There are multiple health and safety issues associated with steel rebars. Initially, the handling and lifting of these rebars can result in musculoskeletal injuries like strains, sprains, and back problems. Due to their weight, these rebars often require manual handling or the utilization of heavy machinery, thereby increasing the chances of accidents and injuries. Moreover, steel rebars are frequently coated with chemicals for corrosion prevention. These coatings may contain harmful substances such as toxic metals or volatile organic compounds (VOCs). Exposure to these chemicals, either through inhaling fumes or direct skin contact, can lead to various health problems including respiratory issues, skin irritation, and chemical burns. Additionally, steel rebars are commonly utilized in construction sites, which are hazardous environments. Workers may encounter risks such as falling rebars, tripping over them, or being struck by them. Furthermore, improper installation or positioning of steel rebars can compromise the construction's structural integrity, potentially resulting in accidents or collapses. To address these health and safety concerns, it is crucial to provide workers handling steel rebars with proper training and personal protective equipment (PPE). Employers should also enforce correct lifting techniques and safe work practices to prevent musculoskeletal injuries. Adequate ventilation systems and the use of respiratory protection can aid in reducing exposure to hazardous chemicals. Lastly, regular inspections and compliance with construction regulations can ensure the appropriate placement and installation of steel rebars, thereby minimizing the risk of accidents and structural failures.

Q: What are the advantages of using galvanized steel rebars?: There are several advantages to using galvanized steel rebars. Firstly, galvanized steel rebars have a protective zinc coating that helps prevent corrosion, extending the lifespan of the rebars and increasing the durability of the overall structure. This makes them ideal for construction projects in areas with high humidity, coastal regions, or where the structure will be exposed to chemicals or other corrosive elements. Additionally, galvanized steel rebars have high tensile strength, meaning they can withstand heavy loads and provide excellent structural support. They are also cost-effective as they require less maintenance and replacement over time compared to other materials. Overall, the use of galvanized steel rebars offers improved longevity, strength, and cost-efficiency, making them a popular choice in construction projects.

Q: How do steel rebars provide flexibility to concrete structures?: Concrete structures can benefit from the flexibility provided by steel rebars in multiple ways. Firstly, the addition of steel rebars reinforces the concrete, enhancing its tensile strength. While concrete is strong in compression, it is weak in tension. By incorporating steel rebars, the concrete becomes more resistant to bending and cracking, as the rebars can absorb the tensile forces that would otherwise cause failure. This reinforcement enables concrete structures to withstand heavier loads and offers flexibility by preventing excessive deformation or collapse. Secondly, steel rebars can be utilized to construct a reinforced concrete frame, which boosts the overall flexibility of the structure. When embedded in the concrete, the rebars form an interconnected network of elements that distribute applied loads more evenly. This network acts as a flexible skeleton capable of adapting to various stresses, such as temperature changes, ground movements, or dynamic forces. As a result, the structure can accommodate minor movements or vibrations without sustaining significant damage. Additionally, steel rebars can be strategically positioned in areas where additional flexibility is required. For instance, in regions prone to seismic activity, rebars can be concentrated in critical areas like building joints or corners. This placement helps dissipate the energy generated during an earthquake, allowing the structure to deform and absorb seismic forces without collapsing. The flexibility provided by steel rebars enhances the seismic resistance of the concrete structure. To summarize, steel rebars contribute to the flexibility of concrete structures by increasing their tensile strength, creating a reinforced concrete frame, and allowing for strategic placement to enhance specific areas of flexibility. This flexibility enables concrete structures to withstand diverse loads, adapt to various stresses, and improve their overall strength and durability.

Q: How do steel rebars affect the overall constructability of concrete structures?: Steel rebars have a significant impact on the overall constructability of concrete structures. Rebars, also known as reinforcing bars, are embedded within the concrete to provide strength and enhance its structural integrity. These steel bars play a crucial role in resisting tensile forces that concrete alone cannot withstand. One of the primary ways rebars affect constructability is by increasing the load-bearing capacity of concrete structures. By reinforcing the concrete, rebars help distribute the applied loads more evenly, reducing the risk of structural failure or collapse. This allows for the construction of taller, larger, and more complex concrete structures that can safely accommodate heavier loads. Moreover, rebars also improve the durability and longevity of concrete structures. Concrete is strong in compression but weak in tension, making it susceptible to cracking and failure under tensile stress. The presence of steel rebars helps to counter this weakness by absorbing and distributing the tensile forces, preventing or minimizing cracks and enhancing the overall durability of the structure. In terms of constructability, the use of rebars simplifies the construction process by allowing for efficient and precise placement of concrete. Rebar cages are typically assembled prior to pouring the concrete, acting as frameworks that provide support and reinforcement. This enables faster and more accurate construction, reducing the risk of errors and rework. Furthermore, rebars also enhance the constructability of concrete structures by enabling flexibility in design. The ability to strategically position and shape rebars allows engineers to create complex structural elements, such as beams, columns, and slabs, with specific load-bearing capabilities. This versatility in design promotes architectural creativity while ensuring the structural integrity of the construction. However, it is important to note that the improper placement or inadequate amount of rebars can have detrimental effects on the constructability and overall performance of concrete structures. Insufficient reinforcement can lead to structural weaknesses, increased vulnerability to seismic activity, and reduced resistance to environmental factors like corrosion. Therefore, proper design and installation of rebars, in accordance with structural engineering standards and codes, are crucial to ensure the optimal constructability and long-term functionality of concrete structures.

Q: What are the different methods for cutting steel rebars on-site?: There are several methods for cutting steel rebars on-site, including the use of a manual rebar cutter, a portable electric rebar cutter, a hydraulic rebar cutter, or a gas-powered rebar cutter. Each method has its advantages and limitations, depending on the specific requirements of the project.

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