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:Can steel rebars be used in water treatment facilities?
- Yes, steel rebars can be used in water treatment facilities. Steel rebars, or reinforcing bars, are commonly used in construction projects to strengthen concrete structures. In water treatment facilities, where concrete is used for various structures such as tanks, basins, and pipelines, steel rebars are often incorporated to provide added strength and durability. Water treatment facilities involve the treatment of water to make it safe for consumption or other purposes. Concrete is a preferred material in these facilities due to its ability to withstand the harsh conditions of water treatment processes, such as exposure to chemicals, high temperatures, and pressure. Steel rebars are essential in reinforcing the concrete structures to ensure they can withstand these demanding conditions. The corrosion resistance of steel rebars is a critical factor to consider when using them in water treatment facilities. Since water treatment facilities often involve the use of chemicals and exposure to moisture, it is important to choose rebars that have appropriate corrosion protection. This can be achieved by using stainless steel rebars or by applying protective coatings to the rebars. It is also worth noting that proper design, construction, and maintenance practices are essential in ensuring the long-term performance of steel rebars in water treatment facilities. Adequate cover thickness, concrete quality, and proper installation techniques are important considerations to prevent corrosion and ensure the rebars provide the desired structural integrity. In conclusion, steel rebars can be effectively used in water treatment facilities to reinforce concrete structures and provide the necessary strength and durability. However, it is important to choose corrosion-resistant rebars and adhere to proper design and construction practices to ensure their long-term performance in these facilities.
- Q:What are the common sizes of steel rebars used in construction?
- The sizes of steel rebars used in construction can vary depending on the specific application and engineering requirements. However, there are several standard sizes that are widely used in the industry. The industry commonly utilizes rebar sizes ranging from #3 to #18. These numbers represent the diameter of the rebar in eighths of an inch. For instance, a #3 rebar has a diameter of 3/8 inch, while a #18 rebar has a diameter of 2 1/4 inches. Regarding metric measurements, the most frequently used rebar sizes range from 10mm to 40mm in diameter. These sizes are typically designated by their nominal diameter in millimeters, such as 10mm, 12mm, 16mm, 20mm, 25mm, 32mm, and 40mm. The selection of the appropriate rebar size depends on various factors, including the required load-bearing capacity, the structural design, and the type of construction project. Smaller diameter rebars, like #3 or 10mm, are typically utilized in lighter construction projects or for smaller concrete elements like walls or slabs. Conversely, larger diameter rebars, like #18 or 40mm, are commonly employed in heavy-duty applications such as bridges, high-rise buildings, or large-scale infrastructure projects. It is important to note that different countries or regions may have their own specific standards regarding rebar sizes. Consequently, it is crucial to consult local building codes and regulations to ensure compliance.
- Q:Can steel rebars be used in historical bridge restoration?
- Yes, steel rebars can be used in historical bridge restoration. In many cases, historical bridges may have deteriorated or suffered damage over time, and steel rebars can provide strength and stability during the restoration process. Steel rebars are commonly used in reinforced concrete structures and can help reinforce the bridge's structural integrity. However, it is important to consider the aesthetics of the historical bridge and ensure that the use of steel rebars does not compromise its historical value or appearance. Preservation guidelines and consultations with historical experts can help determine the appropriate use of steel rebars in historical bridge restoration projects.
- Q:How do steel rebars affect the overall weight of a concrete structure?
- Steel rebars typically increase the overall weight of a concrete structure. This is because steel rebars add additional mass to the concrete, making it heavier. However, the weight increase is generally proportionate to the added strength and durability that the rebars provide, making them essential for reinforcing the structure and improving its structural integrity.
- Q:How do steel rebars affect the shrinkage and creep behavior of concrete?
- Steel rebars can significantly affect the shrinkage and creep behavior of concrete. Shrinkage refers to the contraction of concrete as it dries and hardens, while creep refers to the long-term deformation of concrete under sustained load. The presence of steel rebars in concrete can reduce the overall shrinkage of the concrete due to two main reasons. Firstly, the steel rebars provide a restraint against shrinkage by resisting the tensile forces that develop during drying. This restraint reduces the overall volume change of the concrete, minimizing the shrinkage. Secondly, the rebars also act as a barrier to moisture movement, limiting the drying and shrinkage of the concrete. However, the addition of steel rebars can also influence the creep behavior of concrete. Creep is influenced by the modulus of elasticity and the strength of the material, and the presence of steel rebars can alter these properties. The high modulus of elasticity and strength of steel rebars can cause the concrete to experience higher levels of creep due to the differential deformation between the concrete and the steel. Moreover, the bond between the rebars and the concrete also plays a role in affecting the creep behavior. The bond strength between the rebars and the concrete can influence the transfer of stress from the concrete to the rebars, affecting the overall creep behavior of the composite material. In summary, steel rebars can reduce the shrinkage of concrete by providing restraint against drying and minimizing moisture movement. However, they can also influence the creep behavior of concrete due to their modulus of elasticity, strength, and the bond between the rebars and the concrete. Understanding the interaction between steel rebars and concrete is crucial in designing structures that can withstand shrinkage and creep effects.
- Q:Are steel rebars suitable for use in seismic zones?
- Yes, steel rebars are suitable for use in seismic zones. They are commonly used in construction to enhance the strength and durability of concrete structures, making them more resistant to seismic forces. The added reinforcement provided by steel rebars helps prevent concrete from cracking or collapsing during an earthquake, ensuring the safety and stability of the building.
- Q:How are steel rebars stored to prevent damage?
- Steel rebars are typically stored in an organized manner, either horizontally or vertically, to prevent damage. They are often placed on pallets or racks, ensuring they are off the ground to avoid contact with moisture. Additionally, rebars are often covered with tarps or protective materials to shield them from exposure to weather elements and potential rusting. Regular inspections are conducted to ensure rebars are not bent, twisted, or damaged, and any defective pieces are removed to maintain their structural integrity.
- Q:How do steel rebars prevent concrete structures from collapsing?
- Steel rebars prevent concrete structures from collapsing by providing reinforcement and strength to the concrete. Concrete is a strong material in compression, meaning it can withstand forces that push or squeeze it together. However, it is weak in tension, meaning it cannot withstand forces that pull it apart. When subjected to tensile forces, concrete can crack and ultimately fail. Steel rebars, or reinforcement bars, are typically placed within concrete structures to counteract these tensile forces and provide additional strength. The rebars are made of high-strength steel and are strategically positioned within the concrete to resist the tensile forces. When external forces, such as wind or seismic activity, act on a concrete structure, the rebars help distribute the load and resist the tension. As the concrete tries to pull apart, the rebars hold it together, preventing cracks from propagating and ensuring the structure remains intact. The rebars also improve the overall durability and longevity of the concrete structure. By reinforcing the concrete, the rebars help reduce the effects of shrinkage and thermal expansion, which can cause cracks over time. This results in a more stable and resilient structure that can better withstand various environmental and structural stresses. Overall, steel rebars play a critical role in preventing concrete structures from collapsing by providing the necessary reinforcement and strength to resist tensile forces. They enhance the structural integrity, durability, and safety of concrete structures, ensuring they can withstand the demands placed upon them and continue to serve their intended purpose for many years.
- Q:Are steel rebars suitable for reinforcement in theme parks and amusement centers?
- Yes, steel rebars are suitable for reinforcement in theme parks and amusement centers. Steel rebars offer high strength and durability, making them ideal for heavily loaded structures and areas with high foot traffic. They can effectively enhance the structural integrity and ensure the safety of buildings and rides in theme parks and amusement centers.
- Q:What is the purpose of stirrups in steel rebar reinforcement?
- The purpose of stirrups in steel rebar reinforcement is to provide lateral support and enhance the overall structural integrity of reinforced concrete elements. Stirrups are typically made of bent steel bars that are placed around the longitudinal rebar within a concrete column, beam, or slab. One of the main functions of stirrups is to prevent the longitudinal rebar from buckling or bending due to external forces such as compression, tension, or shear. By enclosing the rebar in a series of closely spaced stirrups, the overall strength and stability of the reinforced concrete element are significantly increased. Stirrups also play a crucial role in resisting shear forces, which occur when a structure is subjected to lateral loads or earthquakes. These forces can cause the concrete to crack and fail. However, the presence of stirrups helps distribute the shear stresses more evenly, effectively preventing the formation and propagation of cracks. Furthermore, stirrups enhance the bond between the rebar and concrete by providing additional contact area. This results in improved load transfer and prevents slippage between the rebar and the surrounding concrete. In summary, the purpose of stirrups in steel rebar reinforcement is to enhance the structural strength, stability, and durability of reinforced concrete elements. They provide lateral support, resist bending and shear forces, and improve the bond between the rebar and concrete. By incorporating stirrups into the reinforcement design, engineers can ensure that the concrete structure can withstand various external loads and maintain its integrity over time.
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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:
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