ASTM, GB Standard Hot Rolled Deformed Steel Rebars

ASTM, GB Standard Hot Rolled Deformed Steel Rebars System 1

ASTM, GB Standard Hot Rolled Deformed Steel Rebars

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Loading Port:: Lianyungang

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 200000 m.t./month

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Specifications of ASTM, GB Standard Hot Rolled Deformed Steel Rebars:

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 ASTM, GB Standard Hot Rolled Deformed Steel Rebars:

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 ASTM, GB Standard Hot Rolled Deformed Steel Rebars:

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 Steel Bar in container

Deformed Steel Bar in factory

Note:

1. Our products are produced according to national standard (GB), if not, supply according to national standards (GB) or agreement as customer required.

2. Other Grade and Standard Deformed Steel Bar we can supply:

Grade: GR40/GR60, G460B/B500A/B500B/B500C,BST500S

Standard: ASTM, BS, DIN

The Minimum Order Quantity of these products is high, and need to be confirmed.

3. We can not only supply Deformed Steel Bar; if you need anything about building materials, please contact us for further information.

4. Please send us your detail specifications when inquire. We will reply to you as soon as possible. We sincerely hope we can establish a long stable business relationship.

Q: Are there any limitations on the maximum spacing between steel rebars in concrete?: Yes, there are limitations on the maximum spacing between steel rebars in concrete. These limitations are specified in building codes and standards. The maximum spacing is determined based on factors such as the structural requirements, load-bearing capacity, and the size and type of rebars used. These limitations ensure the structural integrity and durability of the concrete structure.

Q: How are steel rebars used in construction?: Steel rebars, also known as reinforcing bars, play a crucial role in construction projects. They are primarily used to reinforce concrete structures and provide strength and stability to building elements such as beams, columns, slabs, and foundations. In construction, rebars are typically laid in a grid pattern within the concrete formwork before pouring the concrete. This grid formation allows the rebars to distribute the tensile forces that occur in concrete structures, preventing cracking and enhancing structural integrity. The rebars are carefully placed at specific locations within the concrete elements based on the design and engineering specifications. They are generally spaced apart at predetermined intervals to ensure optimal reinforcement and to bear the anticipated loads. During the concrete pouring process, the wet concrete fully envelops the rebars, creating a bond between the two materials. As the concrete hardens and cures, it tightly grips the rebars, creating a composite structure that can resist bending, shearing, and other types of stress. Steel rebars are available in various sizes and grades, depending on the specific requirements of the construction project. They are typically made from carbon steel and may have different surface finishes to enhance their bonding capabilities with concrete. In addition to providing strength, rebars also help in controlling cracking caused by shrinkage, temperature changes, and external forces. By absorbing and distributing these forces, they minimize the risk of structural failure and ensure the overall stability and durability of the concrete components. Overall, steel rebars are essential components in construction as they reinforce concrete structures, increase load-bearing capacity, and enhance the longevity of buildings and infrastructure. Their proper placement and utilization are critical for building resilience, safety, and structural integrity.

Q: How are steel rebars stored on site to prevent damage?: Steel rebars are typically stored on site in a way that prevents damage by keeping them off the ground, away from moisture, and organized to avoid any bending or deformation. This can be achieved by using racks or pallets to elevate the rebars, covering them with tarps or plastic sheets to shield from rain or snow, and arranging them in a neat and orderly manner to minimize any accidental mishandling or impact.

Q: What is the minimum cover required for steel rebars in concrete?: The minimum cover required for steel rebars in concrete typically depends on the structural design and the intended exposure conditions. However, as a general guideline, the minimum cover requirement for steel rebars in concrete is usually specified as 1.5 inches (38 millimeters) for normal indoor or dry conditions, and may increase to 2 inches (51 millimeters) or more for harsher outdoor or corrosive environments. It is essential to consult the relevant building codes, standards, and engineering professionals to determine the specific minimum cover requirement for a particular project.

Q: What are the different types of steel rebars used in tunnel constructions?: In tunnel constructions, various types of steel rebars are used to enhance the structural integrity and strength of the tunnels. These rebars are crucial components that provide reinforcement and stability to the tunnel structures. Here are some of the different types of steel rebars commonly used in tunnel constructions: 1. Mild Steel Rebars: Mild steel rebars, also known as black or carbon steel rebars, are the most commonly used type of rebars in tunnel constructions. They are cost-effective and possess adequate strength to meet the structural requirements of tunnels. 2. High-Strength Steel Rebars: High-strength steel rebars, also referred to as tension steel, have enhanced tensile strength, making them ideal for tunnel constructions where high load-bearing capabilities are required. These rebars are typically made from alloys such as ASTM A615 Grade 80 or ASTM A706 Grade 80. 3. Stainless Steel Rebars: Stainless steel rebars are corrosion-resistant and offer excellent durability in harsh tunnel environments. They are commonly used in tunnel constructions where corrosion protection is essential, such as in marine or coastal areas. 4. Epoxy-Coated Rebars: Epoxy-coated rebars are regular mild steel rebars with an epoxy coating applied to protect them from corrosion. They are commonly used in tunnel constructions where the tunnels are exposed to moisture, chemicals, or other corrosive elements. 5. Galvanized Rebars: Galvanized rebars are coated with a layer of zinc to protect them from corrosion. They are commonly used in tunnel constructions where the tunnels are exposed to moisture or in areas with high humidity levels. 6. Fiberglass Rebars: Fiberglass rebars, also known as GFRP (Glass Fiber Reinforced Polymer) rebars, are non-corrosive and lightweight. They are used in tunnel constructions where weight reduction is a critical factor or in areas with high electromagnetic interference. 7. Carbon Fiber Rebars: Carbon fiber rebars, also known as CFRP (Carbon Fiber Reinforced Polymer) rebars, possess high tensile strength and are corrosion-resistant. They are commonly used in tunnel constructions where high tensile strength and resistance to chemical or environmental degradation are required. The selection of the appropriate type of steel rebar for tunnel constructions depends on various factors such as load-bearing requirements, exposure to corrosion, environmental conditions, and project budget. Consulting with structural engineers or construction experts is advised to ensure the optimal choice of steel rebars for tunnel projects.

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: What are the international standards for steel rebars?: Various organizations and bodies, such as the International Organization for Standardization (ISO), the American Society for Testing and Materials (ASTM), and the European Committee for Standardization (CEN), set the international standards for steel rebars. ISO establishes standards for steel rebars through ISO 15630, which covers both hot-rolled and cold-worked rebars. This standard outlines the requirements for the chemical composition, mechanical properties, dimensions, and tolerances of rebars used in reinforced concrete structures. ASTM has developed multiple standards for steel rebars, such as ASTM A615/A615M and ASTM A706/A706M. ASTM A615/A615M focuses on deformed and plain carbon-steel rebars for concrete reinforcement, specifying the chemical composition, mechanical properties, dimensions, and marking requirements. On the other hand, ASTM A706/A706M concentrates on low-alloy steel rebars with improved weldability, suitable for concrete structures that require welding. In Europe, CEN has established the primary standard for steel rebars as the Eurocode 2 (EN 1992-1-1). This code provides design rules for the structural use of concrete and includes guidelines for the selection and utilization of rebars. Additionally, CEN has also developed EN 10080, which specifies the requirements for steel rebars used in concrete reinforcement, covering chemical composition, mechanical properties, dimensions, and tolerances. These international standards guarantee the quality and consistency of steel rebars utilized in construction projects worldwide. Complying with these standards helps ensure the safety and reliability of reinforced concrete structures by providing guidelines for material properties, manufacturing processes, and quality control measures.

Q: What is the effect of impurities on the corrosion resistance of steel rebars?: Impurities in steel rebars can have a negative impact on their corrosion resistance. These impurities, such as sulfur, phosphorus, and certain non-metallic inclusions, can promote the formation of localized corrosion sites and accelerate the corrosion process. Additionally, impurities can weaken the protective oxide layer on the surface of the steel, making it more susceptible to corrosion. Therefore, minimizing impurities in steel rebars is crucial to ensure their long-term corrosion resistance and structural integrity.

Q: What is the effect of steel rebars on the electrical conductivity of concrete?: Steel rebars have a significant effect on the electrical conductivity of concrete. As steel is a highly conductive material, the presence of steel rebars in concrete increases its overall electrical conductivity. This is due to the fact that steel rebars create a network of conductive paths throughout the concrete matrix, allowing for the easy flow of electrical current. The electrical conductivity of concrete is an important factor to consider, especially in applications where electrical grounding or conductivity is necessary. Steel rebars aid in providing a low-resistance pathway for electrical current, improving the overall electrical conductivity of the concrete structure. However, it is essential to note that the presence of steel rebars can also introduce potential challenges in certain scenarios. For instance, in electrical installations where insulation is required or in areas where electrical isolation is necessary, the conductivity provided by steel rebars may not be desired. In such cases, additional measures like insulation or isolation techniques need to be employed to prevent unwanted electrical currents from flowing through the concrete. Overall, the effect of steel rebars on the electrical conductivity of concrete is dependent on the specific requirements and applications of the concrete structure. Understanding the intended use and implementing appropriate measures accordingly will ensure that the electrical conductivity of the concrete meets the desired specifications.

Q: How much is the minus difference per ton of thread steel?: Steel is commonly known as hot rolled ribbed bar, belonging to the small steel steel, mainly used for steel reinforced concrete structure frame.

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