Deformed bars with grade HRB400,high quality

Deformed bars with grade HRB400,high quality System 1

Deformed bars with grade HRB400,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	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

Deformed bars with grade HRB400,high quality

*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: How do steel rebars affect the overall fire resistance of concrete structures?: Steel rebars have a significant impact on the overall fire resistance of concrete structures. Steel rebars, also known as reinforcement bars, are used in concrete structures to provide strength and stability. When exposed to fire, the behavior of steel rebars can either enhance or compromise the fire resistance of the concrete structure. The addition of steel rebars in concrete has a favorable effect on the fire resistance of the structure. The high thermal conductivity of steel helps to dissipate the heat generated during a fire, preventing localized overheating and reducing the risk of structural failure. This dispersal of heat through the steel rebars slows down the rate of temperature rise in the concrete, providing additional time for evacuation and firefighting efforts. Moreover, the presence of steel rebars also helps to maintain the structural integrity of the concrete during a fire. Concrete has low tensile strength, and when exposed to high temperatures, it tends to crack and spall. However, the presence of steel rebars helps to mitigate this problem. The rebars act as reinforcement, holding the concrete together and preventing it from falling apart under the influence of heat. However, it is important to note that steel rebars can also have a negative impact on fire resistance if not properly designed or protected. If the size and spacing of the rebars are inadequate, it can result in a rapid transfer of heat through the concrete, leading to premature failure. Additionally, if the rebars are not adequately protected with fire-resistant materials, they can lose their strength and integrity, further compromising the overall fire resistance of the structure. To ensure optimal fire resistance, designers and engineers take into account various factors such as the size, spacing, and coating of the steel rebars, as well as the concrete cover thickness. Additionally, fireproofing measures such as the use of intumescent coatings, fire-resistant insulation, and fireproof claddings can be employed to enhance the fire resistance of steel rebars and the overall concrete structure. In conclusion, steel rebars play a crucial role in the fire resistance of concrete structures. When appropriately designed and protected, they can enhance the fire resistance by dissipating heat and maintaining structural integrity. However, inadequate design or lack of protection can compromise the fire resistance. Therefore, it is essential to follow proper design guidelines and implement appropriate fireproofing measures to ensure the overall fire safety of concrete structures.

Q: Are steel rebars suitable for use in industrial structures?: Yes, steel rebars are suitable for use in industrial structures. Steel rebars, also known as reinforcing bars, are commonly used in the construction industry to provide added strength and stability to concrete structures. They are made from high-strength steel and have excellent tensile strength, making them ideal for reinforcing concrete in industrial structures that are subject to heavy loads, vibrations, or other dynamic forces. Steel rebars also have good ductility and can withstand bending without breaking, which is important in industrial structures where high structural integrity is required. Additionally, steel rebars have good resistance to corrosion, which is essential in industrial environments where exposure to moisture, chemicals, or other corrosive agents is common. Overall, steel rebars are a reliable and durable choice for reinforcing industrial structures, ensuring their long-term structural stability and safety.

Q: How are steel rebars protected against rust and corrosion?: Steel rebars are protected against rust and corrosion through a process called corrosion prevention. This typically involves applying a protective coating, such as epoxy or zinc, to the surface of the rebar. Additionally, rebars can be embedded in concrete, which acts as a barrier against moisture and oxygen, further preventing corrosion.

Q: What is the effect of steel rebars on the thermal conductivity of concrete?: The thermal conductivity of concrete is greatly affected by the presence of steel rebars. Steel, being an excellent conductor of heat, allows thermal energy to easily pass through its structure. When steel rebars are embedded in concrete, they create a pathway for heat to flow within the material. The thermal conductivity of steel rebars can have both positive and negative consequences on the overall thermal performance of concrete structures. On one hand, it can improve heat transfer within the structure, enabling more efficient heating or cooling. This is advantageous in scenarios where thermal conductivity is desired, such as in building designs that require active temperature control. However, the presence of steel rebars can also result in increased heat loss or gain based on the environmental conditions. When there is a temperature difference between the inside and outside of the structure, the steel rebars can act as thermal bridges, making it easier for heat to escape or enter the building. As a consequence, higher energy consumption is needed for heating or cooling purposes. To address these potential issues, additional insulation measures can be implemented to decrease the thermal bridging effect caused by steel rebars. This may involve using thermal break materials or coatings, or adopting insulation techniques like adding foam or other insulating materials around the rebars. In conclusion, steel rebars significantly influence the thermal conductivity of concrete. While they can enhance heat transfer within the structure, they can also lead to increased heat loss or gain. Appropriate insulation measures should be taken into account to minimize the negative effects of thermal bridging caused by steel rebars.

Q: What are the different methods of connecting steel rebars together?: There are several different methods of connecting steel rebars together, depending on the specific requirements of the construction project. Some of the most common methods include: 1. Lap Splicing: This involves overlapping two rebars and then securing them together using steel wire or steel bars. It is a simple and cost-effective method but requires a longer length of rebars. 2. Mechanical Splicing: In this method, a mechanical coupler is used to connect two rebars together. The coupler is usually a sleeve or a collar that is attached to the ends of the rebars, providing a strong and reliable connection. Mechanical splicing is faster and more efficient than lap splicing, and it also allows for flexibility in positioning the rebars. 3. Welding: Welding is another method of connecting steel rebars, where the ends of the rebars are heated and fused together using an electric arc. This creates a strong and permanent connection. However, welding requires skilled labor and can be time-consuming and costly. 4. Threaded Couplers: Threaded couplers are similar to mechanical splicing, but instead of using a sleeve or collar, the rebars are threaded at the ends and then connected using a threaded coupler. This method provides a strong and reliable connection and is often used in larger construction projects. 5. Grout Sleeve Splicing: This method involves placing a grout-filled sleeve between two rebars to create a connection. The grout provides additional strength and stability to the joint. Grout sleeve splicing is commonly used in seismic zones or areas where high strength and ductility are required. 6. Reinforcing Bar Couplers (RBC): RBC is a proprietary method of connecting rebars, where a threaded sleeve is used to connect the rebars. The sleeve is filled with epoxy resin to create a strong bond. RBC offers high load capacity, ease of installation, and resistance to corrosion. It is important to consult with structural engineers and follow building codes and regulations to determine the most appropriate method of connecting steel rebars for a specific construction project.

Q: Can steel rebars be used in sound barrier walls?: Indeed, sound barrier walls can employ steel rebars. These rebars are regularly employed in the construction of reinforced concrete structures, such as sound barrier walls. They furnish the walls with resilience and longevity, guaranteeing their ability to endure the pressures exerted upon them by wind, weather, and impacts. Moreover, steel rebars aid in fortifying the structural integrity of the sound barrier walls, rendering them more impervious to vibrations and the transmission of noise. Consequently, steel rebars are a fitting and frequently utilized material in the construction of sound barrier walls.

Q: Can steel rebars be used in structures with high levels of carbonation or acid attack?: Structures with high levels of carbonation or acid attack should avoid using steel rebars. Carbonation occurs when alkaline compounds in concrete react with carbon dioxide from the atmosphere, resulting in a decrease in the concrete's pH level. This can cause the corrosion of steel rebars, as the lower pH levels create an acidic environment that promotes rusting. Similarly, acid attack happens when structures come into contact with acidic substances like industrial chemicals or acid rain. Acidic environments accelerate the corrosion process by further lowering the pH levels of the concrete, increasing the risk of steel rebar deterioration. To prevent these problems, structures exposed to high levels of carbonation or acid attack can use alternative materials such as stainless steel, epoxy-coated rebars, or fiber-reinforced polymer rebars. These materials possess improved corrosion resistance properties, ensuring better durability in challenging environments. It is essential to consider the specific conditions in which the structure will be exposed and seek advice from structural engineers to select the most suitable materials for long-term performance and safety.

Q: Are there any limitations on the maximum length of steel rebars used in construction?: There are restrictions on the maximum length of steel rebars used in construction, which can vary based on factors like structural design, construction codes, and transportation limitations. Generally, the length of steel rebars is limited due to practical considerations such as handling, transportation, and installation. Very long rebars can be challenging to transport and maneuver on construction sites, and they may also be more susceptible to bending or sagging, thus compromising their structural integrity. Consequently, construction industry standards and codes typically establish guidelines or restrictions on the maximum length of steel rebars to guarantee their safe and efficient utilization in construction projects. Architects, engineers, and contractors must adhere to these limitations to ensure the building's structural stability and safety.

Q: How do steel rebars contribute to the overall resistance against natural disasters?: Steel rebars contribute to the overall resistance against natural disasters in various ways. Firstly, steel rebars are extensively used in reinforced concrete structures such as buildings, bridges, and dams, which are designed to withstand natural disasters like earthquakes and hurricanes. The addition of steel rebars increases the structural integrity of these concrete elements, making them more resistant to the forces exerted by such disasters. During earthquakes, the flexible nature of steel rebars allows them to absorb and distribute the seismic energy throughout the structure. This helps in dissipating the destructive forces and reducing the chances of collapse or severe damage. The presence of steel rebars also enhances the ductility of reinforced concrete structures, which means they can deform and flex without breaking, thus improving their overall resilience against seismic events. In the case of hurricanes or strong winds, steel rebars provide additional strength and stability to concrete structures. They act as reinforcement, preventing the concrete from cracking or crumbling under the pressure of high winds. The combination of the tensile strength of steel and the compressive strength of concrete creates a robust and durable structure that can withstand the powerful forces generated by hurricanes. Furthermore, steel rebars play a crucial role in the construction of flood-resistant structures. During flooding events, the strength and corrosion resistance of steel rebars ensure the structural integrity of buildings and other infrastructure, preventing them from being severely damaged or washed away. The use of steel rebars in flood-prone areas helps in creating resilient structures that can withstand the erosive forces of water and remain intact. Overall, steel rebars significantly contribute to the overall resistance against natural disasters by enhancing the strength, durability, and flexibility of concrete structures. Their presence improves the structural integrity and resilience of buildings, bridges, and other infrastructure, making them more capable of withstanding the destructive forces unleashed by earthquakes, hurricanes, and floods.

Q: What are the guidelines for repairing or replacing corroded steel rebars in existing structures?: The guidelines for repairing or replacing corroded steel rebars in existing structures vary depending on the severity of the corrosion and the specific requirements of the project. However, there are some general guidelines that can be followed: 1. Assessment: Before proceeding with any repairs or replacements, a thorough assessment of the corrosion damage should be conducted. This may involve visual inspections, non-destructive testing, or even laboratory analysis of samples taken from the rebars. 2. Safety: Safety should always be the top priority when working with corroded rebars. Adequate precautions should be taken to ensure the safety of workers and surrounding areas. This may include the use of personal protective equipment and ensuring a stable work environment. 3. Determine the extent of corrosion: It is important to determine the extent of corrosion and whether it has affected the structural integrity of the rebars. This can help in deciding whether repair or replacement is necessary. 4. Repair methods: Depending on the severity of corrosion, various repair methods can be employed. These may include removing the corroded portion of the rebar and applying a corrosion inhibitor or protective coating, or using electrochemical techniques such as cathodic protection to prevent further corrosion. 5. Replacement: If the corrosion damage is extensive and repair is not feasible, the corroded rebars may need to be replaced. The replacement rebars should be of the same or higher grade and should be properly anchored to maintain the structural integrity of the existing structure. 6. Design considerations: When repairing or replacing corroded rebars, it is important to consider the design requirements of the structure. The repaired or replaced rebars should meet the necessary load-bearing capacity and should be properly integrated into the existing structure. 7. Quality control: Throughout the repair or replacement process, rigorous quality control measures should be implemented to ensure the effectiveness and durability of the repairs. This may include regular inspections, testing, and monitoring of the repaired or replaced rebars. It is important to note that these guidelines are general recommendations and should be tailored to the specific circumstances and requirements of each project. Therefore, it is advisable to consult with a structural engineer or a professional experienced in repairing corroded steel rebars for a more accurate and detailed guideline.

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