HRB400 hot-rolled reinforced bar
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HRB400 - Definition
That is the new standard name for HRB400 steel, grade three steel as the old name, as a kind of hot rolled ribbed bar. In the construction industry, three screw steel is the old saying.
Hot rolled ribbed steel grades by HRB and number of yield points minimumcomposition. H, R, B respectively (Hot rolled), hot rolled ribbed steel bar(ribbed), (Bars) the three word's first letter English.
HRB400 - Classification
Hot rolled ribbed steel bar is divided into HRB335 (the old number is 20MnSi),HRB400 (the old No. 20MnSiV, 20MnSiNb, 20Mnti), HRB500 three brands.
Hot rolled bars of fine grains in the grades of hot rolled ribbed bar after Englishabbreviation "fine" English (Fine) the first letter. Such as: HRBF335, HRBF400,HRBF500.
A suitable grade higher requirements for seismic structures: add E in the existing brands after (for example: HRB400E, HRBF400E).
HRB400 - the main purposes
Widely used in houses, bridges, roads and other civil engineeringconstruction.
HRB400 - the main origin
Screw thread steel producers in China are mainly distributed in the north and Northeast China, North China regions such as Shougang, Tang Gang, Xuan Steel, bearing steel, Shanxi Zhongyang steel plant, Baoding Purui the steel,the northeast area such as resistant, Bei Tai, Fushun Steel, these two areas account for about 50% of the total output in the screw thread steel.
The difference between the screw thread steel and round steel bar is provided with longitudinal ribs and transverse ribs surface, usually with two longitudinalribs and transverse ribs along the length direction of the uniform distribution.Screw thread steel belongs to the small steel steel, mainly used in reinforced concrete building components of the skeleton. In use requires a certainmechanical strength, flexural property of welding technology and properties.Screw thread steel billet production raw material for the carbon structure steelsmelting processing sedation or low alloy structural steel, finished steel for the hot rolling, normalizing or hot-rolled state of delivery.
The bending properties of HRB400 - reverse
According to the requirements of the buyer, screw steel for bendingperformance of reverse test.
Reverse bending test bending test bending center diameter than a corresponding increase in rebar diameter. The first positive bending 45 degrees, 23 degrees backward bending, reverse bending 23 degrees after.The reverse bend test, screw steel bending parts shall not generate cracksurface.
HRB400 - surface quality
Screw thread steel surface shall not be permitted to have crack, scarring andfolding.
Screw thread steel surface allows the bumps, but shall not exceed thetransverse rib height, depth of thread other defects on the surface of steel andheight shall not allow the deviation is greater than the location dimension.
HRB400 - dimension, shape, weight and permissible deviations
1 nominal diameter range and recommended diameter
Screw thread steel of nominal diameter range of 6 ~ 25mm, screw steelnominal diameter standard recommended for 6, 8, 10, 12, 16, 20, 25, 32, 40,50mm.
2 surface shape and size of the allowable deviation of rib steel plate
Ribbed Rebar shall meet the following basic rules of transverse ribs:
The included angle beta transverse rib and steel plate axis should not be less than 45 degrees, while the angle of not more than 70 degrees, the screw thread steel on both sides of the transverse rib of relative direction should bethe opposite;
Transverse rib and spacing L not greater than 0.7 times the nominal diameter of the screw thread steel;
Transverse rib side and screw steel surface shall not be less than 45 degreesangle;
The gap between the screw thread steel on both sides of the end of therelative transverse ribs (including longitudinal rib width) should not be greater than the nominal sum of screw thread steel perimeter 20%;
When the screw thread steel nominal diameter is less than 12mm, the relativerib area should not be less than 0.055; some nominal diameter is 14mm and 16mm, the relative rib area should not be less than 0.060; nominal diametergreater than 16mm, the relative rib area should not be less than 0.065.
The length and the allowable deviation of 3
A, length: screw steel usually according to fixed length delivery length, specific delivery length should be specified in the contract; some thread steel to coil at the time of delivery, every dish is a screw steel, allowing each batch of 5%number (less than two wheel is two disc) consisting of two screw thread steel.The wheel weight and diameter of disc by both sides provisions.
B, length tolerance: screw thread steel according to fixed length delivery length when the allowable deviation shall not exceed +50mm.
C, the bending degree and end: allergic straight thread steel bending does not affect the normal use, the total bending degree greater than the total length ofthread steel 40%; screw steel end should be cut straight, local deformationshould not affect the use. [1]
HRB400 - the need to detect project
Inspection items include: serial number of certificate, rolling furnace number,grade, chemical composition (C, Si, Mn, P, V), tensile strength, yield point,percentage elongation, relaxation rate, sectional area, product name,specifications, quantity, date of production, the implementation of standards,receiving unit etc.. Acceptance only after passing inspection will only be forrebar.
- Q:How do steel rebars contribute to the overall safety of a structure?
- Steel rebars contribute to the overall safety of a structure in several ways. Firstly, they provide reinforcement to concrete, which is a brittle material and prone to cracking under tension. By embedding steel rebars within the concrete, the structure gains enhanced tensile strength, allowing it to withstand greater loads and resist cracking or failure. Secondly, steel rebars help to distribute and dissipate stress throughout the structure. When a load is applied to a structure, such as an earthquake or heavy winds, it creates internal forces that need to be managed and dispersed. Steel rebars act as a network of interconnected bars, transferring the load from one rebar to another, and eventually to the foundation. This helps to prevent localized stress concentrations and ensures that the structure can better withstand external forces. Moreover, steel rebars improve the ductility of a structure. Ductility refers to a material's ability to deform without breaking. When a structure is subjected to extreme forces, such as seismic activity or high winds, it needs to be able to flex and absorb energy without collapsing. Steel rebars provide this ductility by elongating and deforming under stress, absorbing and dissipating energy before reaching a critical point of failure. This characteristic makes steel rebars crucial in protecting the overall integrity of the structure and ensuring the safety of its occupants. Furthermore, steel rebars also contribute to the long-term durability of a structure. Concrete is susceptible to various environmental factors, such as moisture, temperature fluctuations, and chemical exposure, which can lead to deterioration and weakening over time. By reinforcing the concrete with steel rebars, the structure becomes more resistant to these factors and maintains its strength and stability for a longer period. In conclusion, steel rebars play a vital role in ensuring the overall safety of a structure. They enhance the tensile strength of concrete, distribute stress, improve ductility, and increase the durability of the structure. By providing these essential properties, steel rebars greatly reduce the risk of structural failure and protect the lives and well-being of those within the building.
- Q:How are steel rebars used in road and pavement construction?
- Steel rebars are used in road and pavement construction to reinforce the concrete structures and provide strength and durability to withstand heavy traffic loads and environmental conditions. They are typically placed within the concrete to prevent cracking and enhance the overall structural integrity, ensuring the longevity and stability of the roads and pavements.
- 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:How do steel rebars affect the overall durability of concrete?
- Concrete structures benefit greatly from the presence of steel rebars, as they significantly contribute to their overall durability. Steel rebars enhance the strength of concrete and its ability to resist external forces and environmental conditions. One of the main functions of steel rebars is to provide tensile strength to concrete, which is naturally weak in resisting tension. Concrete is known for its excellent compressive strength but tends to crack under tension. By embedding steel rebars within the concrete, these cracks are effectively controlled and prevented from expanding, ultimately improving the durability of the structure. Steel rebars also increase the flexural strength of concrete, allowing it to withstand bending and deformations more effectively. This is particularly important in structures such as beams, columns, and slabs that experience significant loads and forces throughout their lifespan. Furthermore, steel rebars act as reinforcement in concrete, enhancing its resistance to external factors like earthquakes, wind, and impact loads. The presence of rebars helps distribute and dissipate these forces throughout the structure, reducing the risk of structural failure and increasing overall durability. Another crucial aspect is the prevention of corrosion in reinforced concrete structures. Steel rebars are typically coated with materials that protect them from corrosion caused by moisture and chemical reactions. This protective coating, combined with the alkaline environment of concrete, forms a barrier that significantly slows down the corrosion process, ultimately increasing the longevity and durability of the concrete structure. To conclude, steel rebars play a vital role in enhancing the overall durability of concrete structures. They provide necessary tensile strength, improve flexural strength, enhance resistance to external forces, and prevent corrosion. Incorporating steel rebars makes concrete more robust, long-lasting, and capable of withstanding various challenges, ensuring the longevity and safety of the structure.
- Q:How do steel rebars affect the overall safety of construction projects?
- Steel rebars play a crucial role in enhancing the overall safety of construction projects. Firstly, steel rebars provide reinforcement to concrete structures, making them stronger and more resistant to various types of forces such as tension, compression, and bending. This reinforcement significantly increases the structural integrity of buildings, bridges, and other constructions, reducing the risk of collapse or failure. Moreover, steel rebars have excellent ductility, meaning they can deform without fracturing under extreme loads. This property allows rebars to absorb and distribute the energy generated during earthquakes, high winds, or heavy impacts, preventing sudden and catastrophic structural failures. Additionally, steel rebars can withstand high temperatures and fire, maintaining their strength and integrity even in the event of a fire, which is crucial for ensuring the safety of occupants. Furthermore, steel rebars are resistant to corrosion, which is a common issue in construction projects. Corrosion weakens the structure by gradually deteriorating the reinforcement. By using steel rebars, the risk of corrosion is significantly reduced, lengthening the lifespan of the construction and ensuring its long-term safety. Overall, the use of steel rebars in construction projects is vital for guaranteeing the safety and durability of structures. They enhance the strength, stability, and resistance of the building, making it capable of withstanding various external forces and potential hazards. By incorporating steel rebars into construction designs, engineers and builders can ensure that the finished project meets the required safety standards, providing peace of mind for both the construction industry professionals and the public.
- Q:What is the effect of welding defects on the performance of steel rebars?
- The performance of steel rebars can be significantly affected by welding defects, which can weaken their structural integrity and compromise the overall strength and durability of the construction project. Porosity is one of the common welding defects, caused by the presence of gas pockets or voids in the weld. This weakens the weld joint, reducing its load-bearing capacity and making it more prone to cracking or breaking under stress. As a result, the rebars may not be able to resist external forces, such as the weight of the structure or seismic activities, potentially leading to collapse or structural failure. Another welding defect is lack of fusion, which happens when there is insufficient bonding between the base metal and the weld metal. This creates a weak joint that can easily separate or crack under load. Lack of fusion can decrease mechanical strength and compromise structural performance as the rebars may not be able to withstand the expected load or forces. Additionally, the presence of weld spatter or excessive weld reinforcement can also have a negative impact on the performance of steel rebars. Weld spatter refers to undesirable splashes or droplets of molten metal that can stick to the rebar's surface, creating potential weak points. Excessive weld reinforcement adds unnecessary weight to the rebar and creates stress concentrations, further increasing the risk of failure. In conclusion, welding defects can significantly affect the performance of steel rebars by weakening their structural integrity, reducing load-bearing capacity, and increasing the likelihood of cracking or breaking under stress. Therefore, it is crucial to implement proper welding techniques and quality control measures to minimize or eliminate these defects and ensure the safety and reliability of the construction project.
- Q:What is the purpose of steel rebars?
- Steel rebars serve the purpose of reinforcing and strengthening concrete structures. These rebars, also referred to as reinforcing bars, consist of steel rods or wires, which function as tension devices to provide extra strength to the concrete. By being embedded within the concrete, rebars aid in the even distribution of applied loads, thereby preventing the concrete from cracking or failing when under pressure. This reinforcement is particularly crucial in structures like buildings, bridges, and highways, which endure heavy loads or potential stress, as it enhances their durability and structural integrity. Due to their strength, durability, and resistance to corrosion, steel rebars are extensively utilized in construction projects. As an essential component, they ensure the long-term stability and safety of concrete structures.
- Q:Can steel rebars be used in cold weather conditions?
- Yes, steel rebars can be used in cold weather conditions. Steel has excellent cold weather performance and can maintain its structural integrity even in extremely low temperatures. However, it is important to ensure that proper construction practices are followed, such as protecting the rebars from moisture and using appropriate concrete curing methods to prevent freezing and cracking.
- Q:Are steel rebars suitable for use in industrial structures?
- Yes, steel rebars are suitable for use in industrial structures. Steel rebars, also known as reinforcing bars, are commonly used in the construction industry to provide added strength and stability to concrete structures. They are made from high-strength steel and have excellent tensile strength, making them ideal for reinforcing concrete in industrial structures that are subject to heavy loads, vibrations, or other dynamic forces. Steel rebars also have good ductility and can withstand bending without breaking, which is important in industrial structures where high structural integrity is required. Additionally, steel rebars have good resistance to corrosion, which is essential in industrial environments where exposure to moisture, chemicals, or other corrosive agents is common. Overall, steel rebars are a reliable and durable choice for reinforcing industrial structures, ensuring their long-term structural stability and safety.
- Q:How do steel rebars contribute to the load-bearing capacity of structures?
- The load-bearing capacity of structures is enhanced by steel rebars in various ways. Firstly, they increase the tensile strength of the concrete, which is weak in tension despite its strength in compression. This addition of steel rebars significantly boosts the structural tensile strength, a crucial aspect considering the different loads structures face, such as dead loads (e.g. the structure's weight), live loads (e.g. occupants, furniture), and environmental loads (e.g. wind, earthquakes). Secondly, steel rebars aid in preventing cracking and improving the overall durability of the structure. Concrete has a tendency to shrink and crack due to factors like temperature changes and moisture. By incorporating steel rebars within the concrete, they act as reinforcement, ensuring a more even distribution of the load and decreasing the likelihood of cracking. This, in turn, enhances the longevity and structural integrity of the building. Moreover, steel rebars also provide support and stability to the structure, particularly against lateral forces that may arise during high winds or seismic events. By securely anchoring the rebars into the foundation or other structural elements, a strong connection is formed, capable of withstanding these lateral loads and safeguarding the structure from collapse or damage. To summarize, steel rebars play a vital role in enhancing the load-bearing capacity of structures through bolstering the tensile strength of the concrete, preventing cracking, and providing stability and support. Their integration into the structural design is paramount for ensuring the safety, durability, and long-term functionality of buildings and other forms of infrastructure.
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HRB400 hot-rolled reinforced bar
- Ref Price:
-
- Loading Port:
- China Main Port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- -
- Supply Capability:
- -
OKorder Service Pledge
OKorder Financial Service
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