Steel rebar from china 6-40MM in different grade

Steel rebar from china 6-40MM in different grade

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 1000 m.t.

Supply Capability:: 17497 m.t./month

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Item specifice

Standard:

AISI

Technique:

Hot Rolled

Shape:

Round

Surface Treatment:

Dry

Steel Grade:

RHB335,HRB400

Certification:

CE,ISO

Thickness:

6-40mm

Length:

5.8-12M

Net Weight:

1-2.5MT

Bars of steel commonly used in construction, especially for reinforcing concrete structures such as driveways,

foundations, walls, and columns. These bars come in different sizes and strength grades, and can be smooth

or may include deformations that provide greater adhesion for concrete poured over the bars. When used in poured

concrete, the bars are typically placed in a grid pattern, the concrete poured over them, and then readjusted to

maintain the proper shape while the concrete sets. Steel rebar can be purchased from a number of manufacturers

and is often found at construction retailers or large hardware stores

Most grades of steel used in rebar cannot accept welding; such as, to adjacent steel plates or as means to bind

single pieces of rebar together. However, special grades of rebar steel and welding rods make welding by expert

welders possible.

To prevent workers from accidentally impaling themselves, the protruding ends of steel rebar are often bent over or

covered with special plastic "mushroom" caps.

Product Description :

Chemical composition (%):	Steel		C		Si	Mn		P	S		Ceq
	HRB335		0.25		0.80	1.60		0.045	0.045		0.52
	HRB400										0.54
	HRB500										0.55
Mechanical properties	Steel	Rel/ MPa		Rm/ MPa			A/ %			Agt/ %
		≥
	HRB335	335		455			17			7.5
	HRB400	400		540			16
	HRB500	500		630			15
Package:	Standard export packing or as customer's request
Application:	Construction, building, bridge, road. ect
Payment terms	1).100% irrevocable L/C at sight. 2).30% T/T prepaid and the balance against the copy of B/L. 3).30% T/T prepaid and the balance against L/C
Delivery time	15-30 days after receipt of L/C or deposit by T/T

Steel rebar from china 6-40MM in different grade

Features

1、Pure steel quality, stable chemical contents, small tolerance.
2、Constant Quality, good drawing performance.
3、High dimension accuracy degree, accuracy degree of Level C up to 80%, smooth surface, less scale, easy to be pickled.
4、Automatic bundling with 4 lines by Machine in tidy and good looks
5、Big high quality percentage, small coil percentage, and heavy coil weight for Hard Coil.
6、High sorbitizing percentage.

Packing:

In bundles, each bundle weight 3.5 tons. Load by container or by bulk verssel.

Steel rebar from china 6-40MM in different grade

FAQ:

1.Q: What's your MOQ(minimum order quantity)?

A: One full container, mixed acceptable .

2. Q: What's your packing methods?

A: Packed in bundle or bulk ..

3. Q: How can I buy CNBM products in my country?

A:Please send us an inquiry or email ,we will reply to you if there is distributor in your country

4. Q: Can we visit your factory?

A: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.

5. Q: How long does it take to get the product if i place an order?

A:With the process of your requirements,we will pack and deliver in 3-7 days. If it is by sea shipment,it will take 15-45 days depending on different locations

Q:How are steel rebars connected or joined together?: Different methods are used to connect steel rebars depending on the specific application and structural requirements. Steel rebars are typically connected or joined together using the following techniques: 1. Overlapping: An effective method involves overlapping two rebars to create a continuous length of reinforcement. The overlapping length must meet the specified design requirements and is usually secured using steel tie wires or mechanical connectors. 2. Welding: Another option is to join steel rebars through welding. This process involves melting the ends of the rebars and fusing them together using heat. Welding is suitable for connecting rebars in pre-fabricated structures or when high strength and durability are necessary. 3. Mechanical couplers: Pre-fabricated devices known as mechanical couplers provide a threaded connection between two rebars. These couplers are typically screwed onto the ends of the rebars, creating a strong and reliable connection. Mechanical couplers are commonly used in construction projects where fast installation and ease of use are important. 4. Lap splicing: A widely used method in reinforced concrete structures involves connecting two rebars by overlapping them and securing the overlap with steel tie wires or mechanical connectors. This approach provides adequate strength and continuity. 5. Grouted splicing: In grouted splicing, the ends of two rebars are embedded into a sleeve or coupling filled with grout or epoxy resin. This ensures a strong bond between the rebars, enhancing load transfer and corrosion resistance. It is crucial to adhere to applicable building codes and structural design specifications when selecting the connection method for steel rebars. This ensures the overall integrity and safety of the structure.

Q:What is the process of reinforcing concrete columns with steel rebars?: To ensure the structural integrity and strength of concrete columns, the process of reinforcing them with steel rebars involves several steps. Initially, the required load-bearing capacity and other structural considerations are taken into account to determine the design and specifications of the concrete column. This involves deciding on the size, shape, and placement of the rebars within the column. Following this, temporary molds or frameworks in the desired shape and dimensions of the column are constructed as part of the concrete formwork preparation. These molds provide support and containment for the concrete during the pouring and curing stages. Once the formwork is ready, the steel rebars are meticulously positioned and fastened within it. They are typically arranged in a specific pattern to maximize reinforcement and strength, including vertical bars running along the length of the column and horizontal bars that wrap around the vertical ones. To maintain their position and prevent movement during the pouring of the concrete, the rebars are often tied together at intersections using wire or other fasteners. This ensures that the rebars are effectively embedded within the concrete and can properly reinforce the column. Once the rebars are securely in place, the concrete is poured into the formwork. The concrete mixture is carefully applied and consolidated to fully surround and encase the rebars, creating a composite material that is more resistant to cracking and deformation. After the concrete is poured, it is left to cure and harden, typically for a period of several days or weeks. This allows the concrete to gain strength and durability, ensuring effective bonding between the rebars and the concrete and enabling the column to bear the intended loads. Once the concrete has fully cured, the formwork is removed, revealing the reinforced concrete column. The rebars should be completely embedded within the concrete, providing additional strength and support to withstand the applied loads. In summary, reinforcing concrete columns with steel rebars involves careful planning, positioning, and securing of the rebars within the formwork, followed by the pouring, curing, and removal of the formwork. This process guarantees that the resulting reinforced concrete column is structurally sound and capable of withstanding the intended loads and forces.

Q:What are the guidelines for proper bending of steel rebars on construction sites?: To guarantee the structural integrity and safety of buildings, it is crucial to adhere to guidelines for bending steel rebars on construction sites. The following are key guidelines that should be followed: 1. Utilize appropriate tools: Make use of a specialized rebar bending machine or manual rebar bender designed specifically for steel rebars. These tools enable precise bending without causing any damage or weak points on the rebar. 2. Accurately determine the required bend angle: Before bending, accurately measure and mark the desired bend angle on the rebar. Use either a protractor or a bending template to achieve the angle you desire. 3. Adhere to the bending radius: The bending radius refers to the minimum radius at which the rebar can be bent without sustaining any damage. Always follow the recommended bending radius provided by the manufacturer or structural engineer to prevent fractures or deformations. 4. Secure the rebar firmly: Before bending, ensure that the rebar is securely fastened in the bender to prevent any slipping or movement during the bending process. This guarantees precise bending and reduces the risk of accidents. 5. Employ a gradual bending process: When bending the rebar, apply gradual pressure and avoid sudden or excessive force. This gradual bending approach minimizes the risk of cracks or fractures and preserves the rebar's structural integrity. 6. Conduct a thorough inspection of the bend: After bending, carefully examine the rebar to ensure that it matches the desired angle and displays no visible defects or stress marks. Any faulty bends should be rectified immediately. 7. Proper storage practices: Store the bent rebar in a designated area, preferably on a flat surface, to prevent any distortion or damage. Avoid placing heavy objects on top of the bent rebar to maintain its shape and strength. 8. Observe safety precautions: Always wear appropriate personal protective equipment (PPE), such as gloves and safety glasses, while performing bending operations. Ensure that the work area is free of obstacles and other workers to prevent accidents. 9. Maintain proper documentation: Document the bending process, including the angle, radius, and any deviations or issues that arise. This information can be valuable for quality control purposes and future reference. 10. Comply with building codes: Ensure that the bending process aligns with local building codes and regulations. Seek guidance from a structural engineer or relevant authorities if necessary. By adhering to these guidelines, construction professionals can ensure the proper bending of steel rebars, resulting in a building that is structurally sound and safe.

Q:How are steel rebars protected against corrosion in aggressive environments?: Steel rebars are protected against corrosion in aggressive environments through various methods. One common method is the use of protective coatings. These coatings can be applied to the surface of rebars to create a barrier between the steel and the corrosive elements in the environment. Examples of protective coatings include epoxy, zinc, and polyethylene coatings. In addition to coatings, steel rebars can also be protected through cathodic protection. This method involves connecting the rebar to a sacrificial anode, usually made of a more reactive metal such as zinc or magnesium. The anode corrodes instead of the rebar, effectively sacrificing itself to protect the steel from corrosion. Another method of protection is the use of corrosion inhibitors. These inhibitors can be added to the concrete mix or applied directly to the rebars. They work by reducing the corrosive potential of the environment or by forming a protective film on the surface of the rebar, preventing corrosion from occurring. Furthermore, proper design and construction practices can also contribute to the protection of steel rebars against corrosion. Adequate concrete cover can help create a physical barrier between the rebar and the aggressive environment, reducing the exposure of the steel to corrosive elements. Good drainage systems and the use of non-corrosive aggregates can also help minimize the exposure of rebars to moisture and other corrosive substances. Overall, a combination of protective coatings, cathodic protection, corrosion inhibitors, and proper design and construction practices are employed to ensure the protection of steel rebars against corrosion in aggressive environments. These measures help extend the lifespan of structures and maintain their structural integrity.

Q:What is the maximum spacing allowed between steel rebars in concrete?: The maximum spacing allowed between steel rebars in concrete depends on various factors such as the size of the rebars, the type of structure, and the design requirements. However, in general, the maximum spacing between rebars is typically limited to three times the diameter of the rebars. This ensures adequate reinforcement and structural integrity of the concrete.

Q:The effect of adding alum on thread steel: The melting point of vanadium is very high, often with niobium, tantalum, tungsten, molybdenum, called refractory metal. Ductile, hard, without magnetism. Resistant to hydrochloric acid and sulfuric acid ability, and resistance to salt water corrosion performance than most stainless steel.

Q:How do steel rebars contribute to the seismic performance of concrete buildings?: Steel rebars contribute to the seismic performance of concrete buildings by providing reinforcement and strength to the structure. The rebars help to distribute and dissipate the energy generated during an earthquake, increasing the building's ability to withstand the seismic forces. They enhance the concrete's tensile strength, preventing cracking and enhancing its overall durability. The combination of concrete and steel rebars creates a composite material that can absorb and withstand the lateral forces caused by ground shaking, reducing the risk of structural failure during seismic events.

Q:How do steel rebars help in load distribution within a structure?: Steel rebars, also referred to as reinforcing bars, are essential for the distribution of loads within a structure. They are extensively utilized in concrete structures, like buildings, bridges, and highways, to enhance their strength and durability. The main objective of steel rebars is to provide tensile strength to the concrete. While concrete is highly capable of withstanding compression, it is relatively frail when it comes to tension. Any structure exposed to loads, whether from the weight of the building itself or external forces, will encounter both compression and tension forces. By incorporating steel rebars into the concrete, they act as reinforcements and resist tensile forces. When an external load is applied to the structure, the rebars bear a significant portion of the generated tension forces. This prevents the concrete from cracking or failing under the applied load. Furthermore, steel rebars aid in the distribution of the load throughout the structure. When a load is imposed on a structure, it generates stress that is spread across the various components. The presence of rebars enables a more uniform distribution of these stresses, reducing the concentration of forces in specific areas. This prevents localized failures and ensures that the load is evenly dispersed across the structure, thereby improving its overall strength and stability. Another crucial aspect of steel rebars is their capacity to bond with concrete. The rough surface of the rebars prevents them from slipping or separating from the concrete, ensuring a robust bond between the two materials. This bond further enhances the distribution of loads by enabling the rebars to effectively transfer the tensile forces to the surrounding concrete. In conclusion, steel rebars play a critical role in the distribution of loads within a structure. They furnish the necessary tensile strength to withstand tension forces, distribute the load evenly across the structure, and bond with the concrete, guaranteeing a sturdy and stable construction. Without steel rebars, concrete structures would be considerably weaker and more prone to cracking or failure under load.

Q:What is the difference between hot-rolled and cold-rolled steel rebars?: The main difference between hot-rolled and cold-rolled steel rebars lies in the manufacturing process. Hot-rolled steel rebars are formed by heating the steel billet to high temperatures and then passing it through rollers to shape it into the desired rebar size. This process results in a rougher surface and less precise dimensions. On the other hand, cold-rolled steel rebars are manufactured by cooling the steel billet and then passing it through rollers at room temperature. This process produces a smoother surface and more accurate dimensions. Overall, the choice between hot-rolled and cold-rolled steel rebars depends on the specific application and the desired properties of the rebar.

Q:What is the importance of proper anchoring of steel rebars in concrete?: The proper anchoring of steel rebars in concrete is crucial for ensuring the structural integrity and stability of the concrete structure. When rebars are not properly anchored, they may become loose or detached from the concrete, leading to potential structural failure, especially under heavy loads or seismic activity. Proper anchoring helps to distribute stress and load evenly throughout the concrete, preventing cracks, displacement, and collapse. It also enhances the bond between the steel and concrete, improving the overall strength and durability of the structure.

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