ASTM STANDARD HIGH QUALITY HOT ROLLED REBAR

ASTM STANDARD HIGH QUALITY HOT ROLLED REBAR System 1

ASTM 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

ASTM 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:Does the grade three thread steel with "E" have the same information price as the ordinary three grade thread steel? Is there a big difference?: Hello, with E thread steel is seismic rebar, without E is the common thread steel, general seismic thread with E was higher than that of ordinary steel prices, the price difference between 50 and 100 yuan, according to the specific market situation.

Q:How do steel rebars affect the overall lifespan of bridge structures?: Steel rebars play a crucial role in enhancing the overall lifespan of bridge structures. By providing reinforcement and strength to the concrete, rebars help to distribute the load and increase the structural integrity of the bridge. Firstly, steel rebars are used to reinforce the concrete components of the bridge, such as beams, columns, and slabs. This reinforcement prevents the formation of cracks and minimizes the risk of structural failure. The rebars act as a support system, enabling the concrete to withstand heavy loads, vibrations, and external forces, such as wind and earthquakes. This reinforcement helps to maintain the structural stability of the bridge throughout its lifespan. Moreover, steel rebars also resist corrosion, which is a major concern for bridge structures exposed to harsh environmental conditions, such as saltwater or high humidity. Corrosion of the reinforcing bars can lead to the degradation of the concrete and weaken the entire structure. However, steel rebars are typically coated with protective materials or made from corrosion-resistant alloys, which significantly reduces the risk of corrosion and extends the lifespan of the bridge. Furthermore, steel rebars allow for flexibility and adaptability in bridge design and construction. They can be easily bent, shaped, and positioned to meet the specific structural requirements of the bridge. This flexibility enables engineers to design bridges with different shapes, spans, and load capacities, enhancing their overall durability and lifespan. In conclusion, steel rebars have a substantial impact on the overall lifespan of bridge structures. By reinforcing the concrete, resisting corrosion, and providing flexibility in design and construction, steel rebars significantly enhance the structural integrity and durability of bridges, ensuring their safe and long-lasting operation.

Q:Are there any limitations on using steel rebars in cold climates?: Yes, there are some limitations on using steel rebars in cold climates. The main concern is the potential for corrosion due to the presence of moisture, salt, and de-icing chemicals commonly used on roads and bridges during winter. When steel rebars are exposed to these elements, they can rust and weaken over time, compromising the structural integrity of the concrete. To mitigate this issue, several measures can be taken. One common practice is to use epoxy-coated rebars, which provide a protective layer against moisture and chemicals. Additionally, stainless steel rebars can be used, as they are highly resistant to corrosion. However, these options can be more expensive than traditional steel rebars. Furthermore, the construction process in cold climates can also present challenges. Concrete cures and gains strength more slowly in low temperatures, which can impact the overall project timeline. Special precautions, such as heating the concrete or using accelerators, may be necessary to ensure proper curing. It is important to consult local building codes and regulations specific to cold climates to ensure compliance and safety. Engineering professionals experienced in cold weather construction practices can provide valuable insights and recommendations to address the limitations associated with using steel rebars in these conditions.

Q:How do steel rebars contribute to the overall sustainability of concrete structures?: Concrete structures benefit from the presence of steel rebars in various ways, thereby contributing to their overall sustainability. To start with, the durability and lifespan of concrete structures are significantly enhanced by steel rebars. By reinforcing the concrete, rebars provide additional strength and prevent cracks or structural failures, thereby extending the structure's life. This reduces the need for frequent repairs or replacements, conserving resources and minimizing the environmental impact of construction activities. Furthermore, steel rebars are entirely recyclable. When a structure reaches the end of its life cycle, the rebars can be easily extracted and recycled, reducing the demand for new raw materials and minimizing waste. This not only conserves natural resources but also reduces greenhouse gas emissions associated with the extraction and production of fresh steel. Incorporating steel rebars into concrete structures also allows for the use of thinner concrete sections. By using less concrete, the demand for cement, a significant source of carbon dioxide emissions during production, is reduced. Therefore, the use of steel rebars helps to lower the overall carbon footprint of concrete structures. Moreover, steel rebars can be designed to resist corrosion, which is a common problem in concrete structures exposed to harsh environments or coastal areas. By providing protection against corrosion, the rebars increase the service life of the structure, reducing the need for maintenance and repairs. This not only saves costs but also reduces the environmental impact associated with maintenance activities. In conclusion, steel rebars play a vital role in enhancing the sustainability of concrete structures by improving their durability, enabling recycling, reducing material consumption, and minimizing maintenance requirements. By incorporating steel rebars into concrete construction, we can create long-lasting, environmentally-friendly structures that contribute to a more sustainable built environment.

Q:What are the guidelines for preventing steel rebars from rusting during construction delays?: To prevent steel rebars from rusting during construction delays, it is important to follow some guidelines: 1. Proper Storage: Store the rebars in a covered and dry area away from moisture and direct sunlight. The storage area should be well-ventilated to prevent condensation. 2. VCI (Volatile Corrosion Inhibitor) Products: Use VCI products such as VCI paper, films, or emitters. These products release corrosion-inhibiting chemicals that create a protective layer on the rebars, preventing rust formation. 3. Proper Packaging: If rebars are being transported or stored for an extended period, ensure they are properly packaged. Wrap the rebars tightly with VCI paper or plastic sheets, and secure the packaging with tape to prevent moisture ingress. 4. Dehumidification: Use dehumidifiers in areas where the rebars are stored to reduce humidity levels. This helps in maintaining the dryness of the surrounding environment and prevents condensation on the rebars. 5. Regular Inspection: Periodically inspect the rebars for any signs of rust formation. If rust is detected, it should be immediately cleaned and treated with anti-corrosion coatings to prevent further damage. 6. Protective Coatings: Apply anti-corrosion coatings on rebars to provide an additional protective layer. These coatings can be epoxy-based or zinc-based, depending on the environmental conditions and project requirements. 7. Remove Standing Water: Ensure that there is no standing water near the rebars, as it can accelerate the rusting process. Proper drainage systems should be in place to prevent water accumulation. 8. Monitoring: Regularly monitor the environmental conditions, including temperature and humidity levels, to identify any potential risks for rust formation. Adjust the storage conditions accordingly, if needed. By following these guidelines, construction delays can be managed effectively, and the steel rebars can be protected from rust formation, ensuring the structural integrity of the project.

Q:Can steel rebars be used in dams and reservoirs?: Yes, steel rebars can be used in dams and reservoirs. Steel rebars are commonly used in the construction of dams and reservoirs to provide structural reinforcement and strength to the concrete structures. The rebars are embedded within the concrete to enhance its tensile strength and prevent cracks or failure.

Q:What are the different types of steel rebars used in marine construction?: There are several different types of steel rebars commonly used in marine construction projects. These types of rebars are specifically designed to withstand the harsh conditions and corrosive environments typically found in marine structures. 1. Stainless Steel Rebars: These rebars are made of high-grade stainless steel, which contains chromium and nickel. Stainless steel rebars offer excellent resistance to corrosion and are commonly used in marine construction where exposure to saltwater and other corrosive elements is expected. They are more expensive than other types of rebars but provide superior durability and longevity. 2. Epoxy-Coated Rebars: Epoxy-coated rebars are carbon steel rebars that have been coated with an epoxy layer. This coating acts as a protective barrier, preventing the steel from coming into contact with corrosive elements and reducing the risk of rust and corrosion. Epoxy-coated rebars are commonly used in marine construction projects where saltwater exposure is high. 3. Galvanized Rebars: Galvanized rebars are carbon steel rebars that have been hot-dip galvanized. This process involves coating the steel with a layer of zinc, which provides excellent corrosion resistance. Galvanized rebars are commonly used in marine construction projects where exposure to seawater or salt spray is expected. 4. Fiberglass Rebars: Fiberglass rebars are made of high-strength glass fibers embedded in a polymer matrix. These rebars offer excellent resistance to corrosion, as they are not affected by saltwater or other corrosive elements. Fiberglass rebars are lightweight, non-magnetic, and have a high tensile strength, making them suitable for marine construction projects. 5. Carbon Steel Rebars: Carbon steel rebars are the most common type of rebars used in construction, including marine projects. While they are not inherently resistant to corrosion, they can be treated with protective coatings, such as epoxy or galvanization, to enhance their durability and resistance to corrosive environments. It is important to consider the specific requirements and conditions of a marine construction project when selecting the appropriate type of steel rebars. Factors such as exposure to saltwater, humidity, and the expected lifespan of the structure should be taken into account to ensure the longevity and safety of the marine structure.

Q:How do steel rebars affect the overall crack width of concrete structures?: The crack width of concrete structures is affected by steel rebars in various ways. Primarily, the reinforcement provided by rebars strengthens the concrete, increasing its resistance to cracking. This reinforcement helps distribute the tensile forces within the concrete, preventing cracks from spreading and widening. When the concrete is subjected to tensile stress, the rebars bear a significant portion of the load, reducing stress on the concrete itself and minimizing crack formation. Furthermore, the use of rebars influences the spacing and size of cracks in concrete structures. Engineers can control the crack width by incorporating rebars at specific intervals and in appropriate sizes. The rebars act as barriers that limit crack width by resisting the tensile forces exerted on the concrete. This is especially important in structures exposed to heavy loads or external forces, as it preserves the structural integrity and durability of the concrete. Moreover, steel rebars impact the propagation of cracks in concrete structures. In the event of cracks, rebars prevent their further extension. They serve as anchors, holding the cracked sections of concrete together and preventing crack spread. This is essential for ensuring overall structural stability and reducing the risk of structural failure. To summarize, steel rebars play a crucial role in influencing the overall crack width of concrete structures. They enhance concrete strength, distribute tensile forces, regulate crack spacing and size, and inhibit crack propagation. By incorporating rebars into concrete structures, engineers can effectively manage and diminish crack formation and severity, ensuring the longevity and safety of the structures.

Q:What are the different methods for reinforcing concrete with steel rebars?: Different methods exist for reinforcing concrete with steel rebars, each serving a specific purpose and offering varying levels of strength and durability. 1. Traditional Reinforcement: Horizontal and vertical steel rebars are placed within the concrete structure, typically forming a grid pattern. Wire or metal ties are used to secure the rebars at intersections. This method is commonly employed for general reinforcement in slabs, walls, and columns. 2. Pre-stressed Reinforcement: Prior to embedding in the concrete, steel rebars are pre-tensioned. Hydraulic jacks are used to stretch the rebars, anchoring them to the structure's foundation. The tension in the rebars counteracts the tensile forces experienced by the concrete under load, increasing strength and crack resistance. 3. Post-tensioned Reinforcement: Similar to pre-stressed reinforcement, this method involves tensioning steel rebars after the concrete has hardened. Ducts or sleeves are placed within the concrete before pouring, through which the rebars are threaded. Once the concrete has cured, hydraulic jacks are used to tension the rebars, applying compressive force and enhancing overall strength and load-bearing capacity. 4. Fiber Reinforced Concrete: Rather than traditional steel rebars, fibers made of steel, glass, synthetic materials, or natural fibers can be added to the concrete mix. These fibers act as a secondary reinforcement system, providing additional strength and durability. Fiber reinforced concrete is commonly used in industrial floors, bridge decks, and pavements. 5. Shotcrete Reinforcement: Shotcrete involves spraying a wet mix of concrete and steel fibers onto a surface using a high-pressure hose. This technique is often employed in slope stabilization, tunnel linings, and underground constructions. The steel fibers in the shotcrete provide reinforcement and enhance the structural integrity of the sprayed concrete. Ultimately, the choice of reinforcement method depends on the specific project requirements, including the structure type, expected loads, and desired durability. By selecting the appropriate method, engineers can ensure that the reinforced concrete structure possesses the necessary strength and resilience to withstand intended use and environmental conditions.

Q:Can steel rebars be used in structures with high electrical conductivity requirements?: Steel rebars cannot be utilized in structures that demand high electrical conductivity. Although steel is a remarkably conductive substance, its implementation as reinforcement in concrete structures involves encasing it within the concrete, thus eliminating any direct electrical pathway. Consequently, steel rebars do not contribute to the overall electrical conductivity of the structure. In cases where high electrical conductivity is necessary, it is advisable to explore alternative materials like copper or aluminum. These materials possess significantly higher electrical conductivity characteristics, enabling them to fulfil the requirements of structures with elevated electrical conductivity demands.

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