Deformed bars in Grade HRB400 with High Quality

Deformed bars in Grade HRB400 with High Quality System 1

Deformed bars in Grade HRB400 with High Quality

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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	6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm, 22mm,25mm,28mm,32mm,36mm,40mm,50mm

Length	6M, 9M,12M or as required
Place of origin	Hebei, China mainland
Advantages	exact size, regular package, chemical and mechanical properties are stable.
Type	Hot rolled deformed steel bar
Brand name	DRAGON

Chemical Composition: (Please kindly find our chemistry of our material based on HRB500 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)
6	28.27	0.222	2.664
8	50.27	0.395	4.74
10	78.54	0.617	7.404
12	113.1	0.888	10.656
14	153.9	1.21	14.52
16	201.1	1.58	18.96
18	254.5	2.00	24
20	314.2	2.47	29.64
22	380.1	2.98	35.76
25	490.9	3.85	46.2
28	615.8	4.83	57.96
32	804.2	6.31	75.72
36	1018	7.99	98.88
40	1257	9.87	118.44
50	1964	15.42	185.04

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

Q:How do steel rebars perform in structures subjected to vibration?: Steel rebars perform well in structures subjected to vibration due to their high tensile strength and stiffness. The reinforcement provided by rebars enhances the structural integrity, preventing cracking or failure under dynamic loads. Additionally, the damping characteristics of steel rebars help dissipate the energy generated by vibrations, reducing the potential for damage or resonance effects. Overall, steel rebars play a crucial role in enhancing the durability and stability of structures exposed to vibration.

Q:What is the difference between steel rebars and steel mesh?: Steel rebars and steel mesh are both commonly used in construction projects to reinforce concrete structures, but they have some key differences in terms of their design and application. Steel rebars, also known as reinforcing bars, are long, cylindrical steel rods that are typically used to provide tensile strength to concrete structures. These rebars are usually placed in a grid-like pattern within the concrete, and they help to prevent cracking and enhance the overall structural integrity of the concrete. Rebars are available in various sizes, and they are typically used in applications where a high amount of tensile force is expected, such as in columns, beams, and slabs. On the other hand, steel mesh, also known as wire mesh or welded wire fabric, consists of a series of interconnected steel wires that are welded together to form a grid-like pattern. This mesh is usually manufactured in large rolls and can be easily cut or bent to the desired shape. Steel mesh is primarily used to provide both tensile and shear strength to concrete structures. It is often used in applications where a lower amount of tensile force is expected, such as in walls, foundations, and pavements. In terms of installation, steel rebars are typically placed and secured within the concrete formwork before the pouring of concrete. They are usually positioned at specific locations as per the structural design requirements. Steel mesh, on the other hand, is laid on top of the formwork or within the concrete pour itself, providing reinforcement throughout the entire concrete structure. Both steel rebars and steel mesh have their own advantages and disadvantages. Rebars offer greater tensile strength and are ideal for applications where heavy loads or high amounts of force are expected. However, they can be more time-consuming and labor-intensive to install due to their individual placement and tying process. Steel mesh, on the other hand, offers easier and faster installation due to its continuous form, and it is more commonly used in smaller-scale projects or applications where lighter loads are expected. In summary, while both steel rebars and steel mesh serve the purpose of reinforcing concrete structures, they differ in terms of their design, installation method, and application. The choice between rebars and mesh depends on the specific structural requirements, project scale, and load expectations. Consulting with a structural engineer or construction professional is recommended to determine the most suitable reinforcement solution for a particular project.

Q:Can steel rebars be used in corrosive environments?: Steel rebars can be used in corrosive environments, but certain precautions need to be taken to ensure their longevity and structural integrity. Corrosive environments, such as those with high levels of moisture, saltwater, or chemical exposure, can accelerate the corrosion process of steel rebars, leading to potential structural damage. To mitigate this risk, various strategies can be employed. One common approach is to use corrosion-resistant reinforcing materials, such as stainless steel rebars or epoxy-coated rebars, which provide an additional layer of protection against corrosion. These materials have proven effective in resisting corrosion even in highly corrosive environments. Another approach is to utilize corrosion inhibitors, which are chemicals added to the concrete mix or applied directly to the steel surface. These inhibitors form a protective layer around the rebars, preventing corrosive agents from reaching the steel and slowing down the corrosion process. Additionally, proper concrete cover thickness should be maintained to ensure rebars are adequately protected from exposure to corrosive elements. Adequate concrete cover acts as a barrier, preventing moisture and other corrosive agents from reaching the steel. Regular inspection and maintenance are crucial to identify any signs of corrosion early on. If corrosion is detected, appropriate measures should be taken to repair or replace the affected rebars to maintain the structural integrity of the project. In summary, while steel rebars can be used in corrosive environments, it is essential to consider the specific conditions and employ the appropriate strategies to protect against corrosion. By using corrosion-resistant materials, applying inhibitors, maintaining proper concrete cover, and conducting regular inspections, the lifespan and performance of steel rebars in corrosive environments can be significantly enhanced.

Q:Can steel rebars be used in the construction of residential buildings?: Yes, steel rebars can be used in the construction of residential buildings. Steel rebars are commonly used as reinforcement in concrete structures, including residential buildings, to provide added strength and stability. They help to distribute loads and prevent cracking or failure in the concrete. Steel rebars are widely used in residential construction projects to enhance the overall structural integrity and durability of the building.

Q:What are the common mistakes to avoid when installing steel rebars?: When installing steel rebars, there are several common mistakes that should be avoided to ensure a successful and safe installation: 1. Improper placement: One of the most common mistakes is placing the rebars in the wrong location. It is essential to follow the engineering or construction drawings precisely to ensure accurate placement. Any deviation from the specified location can compromise the structural integrity of the reinforced concrete. 2. Insufficient cover: Another mistake is not providing enough concrete cover over the rebars. The cover serves as a protective layer, preventing the rebars from corrosion and providing fire resistance. Inadequate cover can lead to premature deterioration and structural failure over time. 3. Inadequate bar support: Proper support for the rebars is crucial to maintain their position during the concrete pouring process. Insufficient support can cause the rebars to sag or move, resulting in an uneven distribution of steel reinforcement, which can compromise the structural strength of the concrete. 4. Poor alignment and spacing: Rebars should be aligned and spaced correctly according to the design specifications. Improper alignment can lead to congestion, difficulty in pouring concrete, and compromised bond strength between the rebar and concrete. Similarly, incorrect spacing can result in insufficient reinforcement, reducing the overall strength of the structure. 5. Failure to clean and remove rust: Before installation, rebars should be thoroughly cleaned to remove any rust, dirt, or other contaminants. Failure to clean the rebars properly can lead to poor bond strength and increased risk of corrosion, which can weaken the structure over time. 6. Inadequate tying: Tying rebars together with the appropriate wire or connectors is essential to maintain proper alignment and ensure the structural integrity of the reinforced concrete. Neglecting to tie the rebars adequately can result in shifting or movement during the concrete pouring process, leading to compromised structural strength. 7. Lack of supervision and quality control: Finally, a common mistake is the absence of proper supervision and quality control during the installation process. It is crucial to have experienced personnel overseeing the installation to ensure compliance with the design specifications, proper installation techniques, and adherence to safety guidelines. By avoiding these common mistakes, the installation of steel rebars can be carried out effectively, resulting in a strong, durable, and safe reinforced concrete structure.

Q:What are the guidelines for proper handling and disposal of steel rebars on construction sites?: Here are the revised guidelines for the correct handling and disposal of steel rebars on construction sites: 1. Handling: - It is important to wear the appropriate personal protective equipment (PPE) such as gloves and safety glasses when handling steel rebars. - To prevent injuries, make sure to lift and carry the rebars correctly, using your legs and not your back. - Avoid throwing or dropping rebars as this can cause damage to the surrounding area and potentially harm workers. 2. Storage: - Rebars should be stored in a designated area that is easily accessible and away from traffic or other hazards. - To prevent them from rolling or falling, stack the rebars vertically. - Organize the rebars using racks or shelves to avoid tangling or damage. 3. Disposal: - Properly dispose of damaged or unusable rebars. - Contact local waste management authorities to understand the specific disposal requirements for steel rebars in your area. - Consider sending the rebars to a recycling facility if recycling is available, to reduce waste and promote sustainability. - Avoid disposing of steel rebars in regular trash bins or open areas, as they can be a safety hazard. 4. Transportation: - When moving rebars within the construction site or transporting them to another location, ensure they are properly secured to prevent falling off the vehicle or causing damage. - Use appropriate vehicles, such as trucks or trailers, with sufficient tie-down points for proper transportation. 5. Training and Communication: - Ensure that all workers involved in handling and disposing of steel rebars receive adequate training on the guidelines and safety procedures. - Clearly communicate the guidelines to all workers, including subcontractors or temporary workers, to ensure consistent adherence to the rules. - Regularly review and update the guidelines as needed to address any evolving safety concerns or regulatory changes. By adhering to these guidelines, construction sites can create a safe and organized working environment while ensuring the proper handling and disposal of steel rebars.

Q:Can steel rebars be used in marine structures?: Yes, steel rebars can be used in marine structures. Steel is a commonly used material in marine construction due to its strength, durability, and resistance to corrosion. However, it is important to use the appropriate type of steel rebars that are specifically designed for marine applications. These rebars are usually made of stainless steel or galvanized steel, which have enhanced corrosion resistance properties compared to regular carbon steel rebars. Additionally, an extra layer of protection such as epoxy coating or cathodic protection systems can be applied to further increase the rebars' resistance to corrosion in harsh marine environments. Regular maintenance and monitoring are also essential to ensure the long-term performance and integrity of steel rebars in marine structures.

Q:How do steel rebars resist alkali-silica reaction in concrete?: The primary reason why steel rebars can withstand the alkali-silica reaction in concrete is because of the passive film that forms on their surface and the alkaline environment of the concrete. When steel rebars are embedded in concrete, they develop a passive film on their surface. This film serves as a protective layer that prevents direct contact between the steel and the aggressive alkali-silica reactive aggregates that are present in the concrete. The formation of this passive film is a result of the high pH of the alkaline environment created by the cement in the concrete, which usually has a pH level of 12-13. This high pH aids in the creation of an oxide layer on the surface of the steel rebar, effectively shielding it from the reactive elements in the aggregates. Moreover, the alkaline environment of the concrete plays a crucial role in maintaining the passivity of the steel rebars. The alkalinity of the concrete enables the passive film to remain stable and intact, providing a continuous barrier against the alkali-silica reaction. As long as the pH of the concrete remains high, the steel rebars will continue to resist the reaction. It is important to note that the thickness and quality of the passive film on the steel rebars are vital in guaranteeing their resistance to the alkali-silica reaction. Any factors that can compromise the integrity of this film, such as carbonation or chloride contamination, can increase the risk of the reaction occurring. In conclusion, the resistance of steel rebars to the alkali-silica reaction in concrete is primarily due to the presence of a passive film on their surface, which is formed by the alkaline environment of the concrete. This film functions as a protective barrier, preventing direct contact between the steel and the reactive aggregates and minimizing the likelihood of the reaction occurring.

Q:How are steel rebars specified in construction drawings?: Steel rebars are typically specified in construction drawings by indicating their size, shape, and spacing, along with any specific requirements such as grade or coating. This information is usually provided through symbols, labels, or callouts on the drawings.

Q:How are steel rebars tested for quality control?: Steel rebars are tested for quality control through various methods such as visual inspection, dimensional checks, and mechanical tests. Visual inspection involves checking for any visible defects or irregularities on the surface of the rebar. Dimensional checks ensure that the rebars meet the required size, length, and weight specifications. Mechanical tests, including tensile and bend tests, evaluate the strength and flexibility of the rebars. These quality control measures help ensure that steel rebars meet the necessary standards and are fit for use in construction projects.

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