EN STANDARD HIGH QUALITY HOT ROLLED REBAR

EN STANDARD HIGH QUALITY HOT ROLLED REBAR

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 50 m.t.

Supply Capability:: 100000 m.t./month

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Product Description:

Appearance: Black

Technique: Slitting hot rolled steel coil

Grade: Q235, Q195,A36 SS400 S235jr.St37-2

Standard: AISI,GB,DIN,ASTM,EN,JIS

Length: 6m, 9m, 12m or as your requirement.

Width: 10mm-1010mm

Thickness: 1.5mm-20mm

Business type: big manufacture

Place of origin: Tianjin China (Mainland)

Packaging Details: In bundles for exporting and sea worthy

Delivery Detail: Within 15-35 days after receiving L/C or deposite T/T

EN STANDARD HIGH QUALITY HOT ROLLED REBAR

General specification as below:

Flat Bar Specification
Width (mm)	Thickness (mm)	Length (m)	Theoretical Weight (kg/m)
20	2.0	6/9/12	0.31
20	2.5	6/9/12	0.39
20	2.75	6/9/12	0.43
25	2.5	6/9/12	0.49
25	3.75	6/9/12	0.74
30	2.5	6/9/12	0.59
30	3.5	6/9/12	0.82
30	9.75	6/9/12	2.30
40	3.5	6/9/12	1.10
40	4.75	6/9/12	1.50
40	11.75	6/9/12	3.69
50	2.75	6/9/12	1.08
50	4.5	6/9/12	1.77
50	9.75	6/9/12	3.83
60	5.5	6/9/12	2.60
60	7.5	6/9/12	3.53
60	11.5	6/9/12	5.42
80	5.5	6/9/12	3.45
80	7.5	6/9/12	4.71
80	11.75	6/9/12	7.38
100	3.25	6/9/12	2.55
100	4.75	6/9/12	3.73
100	7.5	6/9/12	5.89
120	9.75	6/9/12	9.18
120	11.75	6/9/12	11.07
150	9.75	6/9/12	11.48
150	11.5	6/9/12	13.54
150	13.5	6/9/12	15.90
160	11.75	6/9/12	14.76
200	9.5	6/9/12	14.92
250	5.75	6/9/12	11.28
340	7.75	6/9/12	20.68

Products Advantages

1. high quality competitive price and Accurate in size

2. high dimensional accuracy

3. Guaranteed raw material

4.high utilization rate of material

5.convenient in construction, saving much time and labor

6. high mechanical strength

Application: Widely used for construction, Ship building, Machinery manufacturing ,steel structure,agriculture and steel grating.

Q: How do steel rebars affect the fire resistance of concrete structures?: Concrete structures can greatly increase their ability to withstand fire by incorporating steel rebars. These rebars serve as reinforcement, providing extra strength and stability to the structure and enabling the concrete to endure the intense heat of a fire. The fire resistance of concrete structures primarily relies on the fact that concrete has low thermal conductivity. When exposed to high temperatures, concrete undergoes spalling, where the outer layer breaks off due to the rapid expansion of trapped water. However, the presence of steel rebars helps prevent spalling by holding the concrete together and preventing it from disintegrating. Moreover, steel rebars have a higher melting point than concrete. This means that even when exposed to extreme heat, the rebars maintain their strength and integrity. Consequently, the overall structural stability of the concrete structure remains intact, even in the presence of fire. Steel rebars also act as a heat sink, absorbing and dissipating heat away from the surrounding concrete. This dissipation of heat prevents the formation and spread of localized hotspots throughout the structure, thereby reducing the risk of structural failure. To further enhance the fire resistance of concrete structures, specialized types of steel rebars, known as fire-resistant or fire-rated rebars, can be utilized. These rebars are specifically designed to withstand high temperatures for extended periods without losing their strength. They are often coated with materials such as epoxy or intumescent coatings, which offer additional protection against fire. In conclusion, steel rebars play a vital role in improving the fire resistance of concrete structures. Their presence enhances the overall structural stability, minimizes spalling, dissipates heat, and provides additional strength to withstand the intense heat generated during a fire.

Q: What is the process of pre-stressing steel rebars?: Steel rebars undergo a process called pre-stressing, wherein a predetermined amount of stress or force is applied to them before they are loaded. This technique is widely employed in the construction industry to enhance the structural strength and durability of concrete structures. The process typically commences with the selection of high-strength steel rebars that possess favorable tensile strength properties. These rebars are commonly crafted from either carbon steel or alloy steel and come in various shapes and sizes, depending on the specific application. Once the rebars are chosen, they are cleaned and coated with a protective layer to prevent corrosion. Subsequently, they are positioned as per the design specifications within the concrete structure, such as beams, columns, or slabs. Next, the pre-stressing process is initiated, which involves two main methods: pre-tensioning and post-tensioning. In pre-tensioning, the rebars are initially tensioned by being fixed to an anchorage point or a sturdy frame. The opposite end of the rebars is then pulled using hydraulic jacks or mechanical devices, exerting a substantial amount of force. Once the desired stress is attained, the rebars are secured in their stressed position by casting concrete around them. After the concrete solidifies, the jacks or devices are released, transferring the stress to the rebars. In post-tensioning, the rebars are initially placed in the concrete structure without any tension. After the concrete solidifies, ducts or channels are created within the structure along the path of the rebars. High-strength steel strands or cables are then inserted through these ducts. The strands are anchored at one end of the structure and tensioned using hydraulic jacks or similar devices. This tensioning process applies a force to the rebars, which is transferred to the concrete, compressing it. Once the desired stress is achieved, the strands are secured and the ducts are filled with grout or mortar for corrosion protection. Both pre-tensioning and post-tensioning techniques yield pre-stressed steel rebars that offer several advantages to concrete structures. These include increased load-carrying capacity, improved resistance to cracking and deformation, enhanced durability, and overall superior structural performance. The process of pre-stressing steel rebars is an essential aspect of modern construction practices, guaranteeing the longevity and safety of various types of concrete structures.

Q: What is the weight of steel rebars per meter or foot?: The weight of steel rebars per meter or foot varies depending on the size and type of rebar being used. Standard steel rebars are typically available in various diameters, ranging from 6mm to 50mm. The weight per meter or foot can be calculated by multiplying the cross-sectional area of the rebar (in square meters or square feet) by the density of steel, which is approximately 7850 kilograms per cubic meter or 0.2836 pounds per cubic inch. To provide a specific example, let's consider a standard 10mm diameter rebar. The cross-sectional area can be calculated using the formula for the area of a circle (πr²), where r is the radius of the rebar (5mm in this case). Assuming a meter as the unit of measurement, the cross-sectional area would be π(0.01m)² = 0.000314 square meters. Multiplying this by the density of steel, we get 0.000314m² * 7850kg/m³ = 2.464 kilograms per meter. Similarly, if we were to calculate the weight in pounds per foot, we would convert the density of steel to pounds per cubic foot (approximately 490 pounds per cubic foot) and multiply the cross-sectional area by this value. It is important to note that weights may vary slightly depending on the specific grade of steel being used, so it is advisable to consult the manufacturer's specifications or a reliable reference for accurate weight calculations.

Q: Are steel rebars prone to bending or warping?: Steel rebars are not generally prone to bending or warping under normal conditions. Steel rebars are designed to have high tensile strength and are commonly used in construction projects to reinforce concrete structures. They are made from strong and durable materials such as carbon steel, which provides them with the ability to withstand heavy loads and resist deformation. However, it is important to note that external factors such as excessive heat or improper handling during transportation and storage can potentially cause rebars to bend or warp. Exposing steel rebars to high temperatures can cause them to lose their structural integrity and become more susceptible to bending or warping. Similarly, mishandling or poor storage practices, such as stacking them unevenly or placing heavy objects on top of them, can lead to deformation. To ensure the structural integrity of steel rebars, it is crucial to follow proper handling and storage guidelines, as well as ensure that they are used within the specified load limits. Additionally, it is essential to consider the environmental conditions in which the rebars will be utilized to minimize the risk of bending or warping.

Q: Can steel rebars be used in the construction of water treatment plants?: Yes, steel rebars can be used in the construction of water treatment plants. Steel rebars are commonly used in the construction industry to reinforce concrete structures, and water treatment plants often require robust and durable infrastructure. Steel rebars provide strength and stability to the concrete components, making them suitable for use in the construction of water treatment plants.

Q: What are the different types of steel rebars used in building construction?: The different types of steel rebars used in building construction include plain carbon steel rebars, epoxy-coated rebars, galvanized rebars, stainless steel rebars, and high-strength rebars.

Q: Do steel rebars have any specific markings or codes?: Yes, steel rebars typically have specific markings or codes to indicate their size, type, and grade. These markings are essential for identifying and ensuring the correct usage of rebars in construction projects.

Q: Can steel rebars be used in historical restoration projects?: Yes, steel rebars can be used in historical restoration projects. They provide structural reinforcement and can help restore the stability and integrity of historical structures while maintaining their original appearance. However, careful consideration should be given to ensure that the use of steel rebars is in accordance with preservation guidelines and does not compromise the historical significance of the structure.

Q: What are the advantages of using corrosion-resistant steel rebars?: The advantages of using corrosion-resistant steel rebars are that they provide increased durability, longer lifespan, reduced maintenance costs, and enhanced structural integrity in reinforced concrete structures.

Q: What are the guidelines for repairing or replacing corroded steel rebars in existing structures?: The severity of corrosion and project-specific requirements determine the guidelines for repairing or replacing corroded steel rebars in existing structures. However, there are some general guidelines that can be followed: 1. Before proceeding with any repairs or replacements, conduct a thorough assessment of the corrosion damage. This may involve visual inspections, non-destructive testing, or laboratory analysis of samples taken from the rebars. 2. Always prioritize safety when working with corroded rebars. Take adequate precautions to ensure the safety of workers and surrounding areas. This may include using personal protective equipment and creating a stable work environment. 3. Determine the extent of corrosion and its impact on the structural integrity of the rebars. This will help determine whether repair or replacement is necessary. 4. Use various repair methods depending on the severity of corrosion. These methods may include removing the corroded portion of the rebar and applying a corrosion inhibitor or protective coating. Electrochemical techniques such as cathodic protection can also be used to prevent further corrosion. 5. If repair is not feasible due to extensive corrosion damage, consider replacing the corroded rebars. The replacement rebars should be of the same or higher grade and properly anchored to maintain the structural integrity of the existing structure. 6. Consider the design requirements of the structure when repairing or replacing corroded rebars. The repaired or replaced rebars should meet the necessary load-bearing capacity and be properly integrated into the existing structure. 7. Implement rigorous quality control measures throughout the repair or replacement process 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 customized 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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