Steel Cold Rolled Deformed Bar
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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 | |||||
Cold Rolled Techniques
Yield Point: 545-565mpa
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.
- Q: Can steel rebars be used in structures exposed to extreme temperatures?
- Yes, steel rebars can be used in structures exposed to extreme temperatures. Steel has high thermal conductivity, which allows it to transfer heat quickly, minimizing the risk of structural damage due to thermal expansion or contraction. However, it is essential to consider the specific temperature range and the potential impact on the structural integrity of the rebar. In extremely high temperatures, other materials or protective measures may be necessary to ensure the stability and safety of the structure.
- Q: How are steel rebars protected during the concrete pouring process?
- To ensure the longevity and structural integrity of steel rebars during the concrete pouring process, several protective measures are implemented. Initially, prior to pouring the concrete, the rebars undergo meticulous cleaning to eliminate any rust, dirt, or contaminants that may compromise the bond between the rebar and the concrete. This is typically achieved by utilizing a wire brush or other mechanical methods. Once the rebars have been thoroughly cleaned, a common practice is to apply a protective layer or coating to them. An epoxy coating is frequently employed for this purpose. The coating acts as a barrier, preventing moisture and chemicals from reaching the steel and causing corrosion. Epoxy coatings are especially valuable in high-risk environments like marine structures or areas with a high chloride content. Another protective method involves the use of corrosion inhibitors. These inhibitors are added to the concrete mixture, which subsequently forms a protective layer around the rebars. By reducing the corrosive effects of chloride ions, oxygen, and other chemicals, the inhibitors work to prevent corrosion. Additionally, it is crucial to ensure adequate concrete cover over the rebars during the pouring process. Concrete cover refers to the thickness of the concrete layer between the surface and the rebar. Sufficient concrete cover safeguards the rebars against exposure to moisture, chemicals, and other environmental factors. To achieve the desired concrete cover, steel stirrups or spacers are positioned around the rebars to maintain a specific distance between the rebar and the formwork. This guarantees even distribution of the concrete around the rebars, providing them with the necessary protection. In conclusion, steel rebars are shielded during the concrete pouring process through various methods, including thorough cleaning, the application of protective coatings, the use of corrosion inhibitors, and the maintenance of proper concrete cover. These measures effectively prevent corrosion and ensure the durability and strength of the reinforced concrete structure.
- Q: Can steel rebars be used in residential foundation construction?
- Yes, steel rebars can be used in residential foundation construction. Steel rebars provide reinforcement and strength to concrete, making them an essential component in the construction of residential foundations.
- Q: What are the different types of steel rebars available for different applications?
- For various applications, there is a wide range of steel rebars available. Some of the commonly used types are as follows: 1. Mild Steel Rebars: These rebars are frequently utilized in construction projects and have a low carbon content, making them cost-effective. They are suitable for general construction purposes and find application in residential buildings, bridges, and small to medium-sized structures. 2. High-strength Reinforcement Bars (HSRB): These rebars possess a higher tensile strength compared to mild steel rebars. They are commonly employed in high-rise buildings, large infrastructure projects, and heavy-duty structures that require greater strength. HSRB rebars are often manufactured using alloys like carbon, manganese, or silicon to enhance their strength. 3. Epoxy-Coated Rebars: To protect against corrosion, these rebars are coated with epoxy resin. Epoxy-coated rebars are commonly used in marine structures, parking garages, and areas with high humidity or exposure to moisture. The epoxy coating acts as a barrier, preventing the steel from coming into contact with corrosive elements, thereby extending the rebar's lifespan. 4. Stainless Steel Rebars: In contrast to mild steel rebars, stainless steel rebars contain a substantial amount of chromium, providing excellent resistance to corrosion. These rebars are often employed in highly corrosive environments such as coastal areas, chemical plants, and wastewater treatment facilities. Stainless steel rebars are also preferred in structures that require high aesthetic appeal, such as architectural buildings and monuments. 5. Galvanized Rebars: Zinc coating is applied to galvanized rebars to safeguard them against corrosion. The zinc coating acts as a sacrificial layer, corroding itself before the underlying steel is affected. These rebars are commonly used in areas with moderate corrosion risks, such as concrete structures exposed to deicing salts or in coastal regions. 6. Carbon Fiber Reinforced Polymer (CFRP) Rebars: CFRP rebars consist of carbon fibers embedded in a polymer matrix. They are lightweight, corrosion-resistant, and possess high tensile strength. CFRP rebars are frequently used in retrofitting existing structures, as they provide excellent strength and durability without adding significant weight. The selection of the appropriate steel rebar depends on the specific application, environmental conditions, and structural requirements. It is crucial to consult structural engineers and adhere to local building codes and standards to ensure the correct type of rebar is chosen for each project.
- Q: Why is the earthing device forbidden to use thread steel instead of round steel as lap steel bar?
- Steel is known as hot rolled ribbed bar. Ordinary hot rolled steel bars are made up of HRB and the minimum yield point of the brand.
- Q: When did the 1305 rebar contract become a major contract?
- 1305 rebar contract is now the main contract.
- Q: What is the typical weight per meter of a steel rebar?
- The weight per meter of a steel rebar may vary depending on its size and grade. Typically, a 10 mm mild steel rebar weighs approximately 0.616 kg/m. However, for larger sizes like a 20 mm rebar, the weight per meter can be around 2.47 kg/m. It should be noted that these values are approximate and may differ slightly based on manufacturing standards and regional regulations.
- Q: Are steel rebars resistant to lightning strikes?
- No, steel rebars are not inherently resistant to lightning strikes.
- Q: What are the guidelines for the proper anchoring of steel rebars in columns?
- To guarantee the structural integrity and safety of reinforced concrete structures, it is crucial to adhere to guidelines regarding the appropriate anchoring of steel rebars in columns. These guidelines are typically established based on industry standards and codes, such as the American Concrete Institute (ACI) Building Code Requirements for Structural Concrete (ACI 318). 1. Lap Length: For sufficient bond strength, rebars must overlap by a minimum distance known as the lap length. This length is determined considering factors like rebar diameter, grade, concrete strength, and design requirements. To calculate the required lap length, specific formulas and tables provided by ACI 318 are used. 2. Embedment Length: The embedment length refers to the section of the rebar embedded within the concrete column. Achieving adequate embedment is essential to effectively transfer applied loads. The embedment length is determined based on factors such as rebar diameter, grade, and compressive strength of concrete. 3. Development Length: The development length is the minimum length of rebar needed beyond the critical section to fully develop its tensile or compressive strength. This ensures the rebar can withstand applied loads and avoid premature failure. ACI 318 provides formulas to calculate the development length considering rebar diameter, grade, concrete strength, and design requirements. 4. Concrete Cover: Concrete cover refers to the thickness of concrete between the rebar's external surface and the column's outer surface. It provides protection against corrosion, fire, and environmental factors. The required concrete cover is determined by considering factors like rebar diameter, grade, exposure conditions, and design requirements. ACI 318 provides minimum cover requirements for different rebar sizes and exposure conditions. 5. Spacing and Positioning: Proper spacing and positioning of rebars within the column are crucial to ensure uniform load distribution and effective reinforcement. The spacing is determined based on column dimensions, rebar diameter, and design requirements. Additionally, rebars should be properly aligned and centered within the column to achieve the intended structural strength. 6. Mechanical Anchorage: In certain cases, mechanical anchorage devices like rebar couplers or headed bars are employed to enhance rebar anchoring in columns. These devices improve load transfer and prevent rebar slippage. The selection and installation of mechanical anchorage should adhere to the manufacturer's recommendations and relevant standards. 7. Quality Control and Inspection: Implementing proper quality control and inspection procedures during rebar installation in columns is crucial. This involves verifying dimensions, lap lengths, embedment lengths, development lengths, concrete cover, spacing, and positioning of the rebars. Regular inspections and non-destructive testing techniques such as ultrasonic or radiographic testing can be utilized to ensure compliance with guidelines and identify any defects or deviations. It is important to note that these guidelines may vary based on specific design requirements, local building codes, and structural considerations. Therefore, it is recommended to consult relevant standards and seek professional advice from structural engineers or experts to ensure proper anchoring of steel rebars in columns.
- Q: Can steel rebars be used in structures with high noise reduction requirements?
- When structures require high noise reduction, steel rebars may not be the most effective solution by themselves, although they can still be utilized. Steel rebars possess sound-dampening properties due to their common usage in construction. However, their primary purpose is to strengthen and reinforce structures, rather than minimize noise transmission. To achieve significant noise reduction in structures, additional measures must be taken, such as incorporating acoustic insulation materials or employing specific design techniques. These techniques may involve the utilization of double walls, sound-absorbing panels, resilient mounts, and other specialized acoustic treatments. Although steel rebars alone do not offer substantial noise reduction, they can still contribute to overall noise reduction endeavors when combined with other soundproofing techniques. It is advisable to consult acoustic experts or engineers to determine the most suitable combination of materials and design strategies to fulfill a structure's specific noise reduction requirements.
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Steel Cold Rolled Deformed Bar
- Ref Price:
-
- Loading Port:
- China Main Port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- -
- Supply Capability:
- -
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