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 wastewater storage tanks?
- Yes, steel rebars can be used in wastewater storage tanks.
- Q:What are the common challenges in handling steel rebars during construction?
- Construction often presents numerous obstacles when it comes to managing steel rebars. One primary hurdle involves the weight and size of the rebars themselves. These metal rods can be quite cumbersome and unwieldy, making it challenging to lift and manipulate them on the construction site. Failing to employ appropriate lifting techniques and equipment can result in worker injuries. Another issue concerns the storage and organization of rebars. Given the various lengths and sizes they come in, it becomes crucial to maintain a well-organized storage area that keeps them separate and easily accessible. Neglecting to do so can lead to construction delays and inefficiencies. Moreover, steel rebars are prone to rust and corrosion if mishandled or stored improperly. Exposing them to moisture, rain, or excessive humidity can cause deterioration, which weakens structures. Therefore, it is vital to safeguard rebars from these elements and store them in a dry, well-ventilated space. Additionally, placing and aligning rebars within concrete structures poses a challenge. This task demands skilled labor and precision to ensure that rebars are correctly positioned according to construction plans. Any errors in placement can compromise the building's structural integrity, leading to safety concerns and expensive repairs. Finally, transporting rebars to the construction site poses a logistical challenge. Coordinating their delivery and ensuring they arrive on time and in the required quantities can be complex, especially in large-scale projects. Delays in receiving rebars can result in project delays and additional costs. In conclusion, effectively managing steel rebars during construction necessitates careful planning, proper storage, skilled labor, and adherence to safety protocols. By addressing these common challenges, construction projects can ensure the successful and efficient utilization of steel rebars.
- Q:What is the typical weight per meter of a steel rebar?
- The typical weight per meter of a steel rebar can vary depending on the diameter and thickness of the rebar. However, on average, a steel rebar weighs around 0.75 kilograms per meter.
- Q:What is the maximum spacing allowed between steel rebars in a concrete structure?
- The maximum spacing allowed between steel rebars in a concrete structure depends on various factors such as the type of structure, its intended use, and the design specifications. Generally, the maximum spacing is determined by the structural engineer and is based on the required structural integrity, load-bearing capacity, and other relevant considerations.
- Q:Are there any restrictions on the use of steel rebars in certain regions?
- Yes, there are certain restrictions on the use of steel rebars in certain regions. These restrictions can vary from region to region and are typically put in place to ensure the safety and integrity of structures. In some areas, building codes and regulations may dictate specific requirements for the use of steel rebars, such as the type, size, and placement of rebars. Additionally, there may be restrictions on the use of certain types of steel rebars, such as epoxy-coated rebars, due to environmental concerns. It is important for construction professionals to familiarize themselves with the local building codes and regulations to ensure compliance and promote the safety and durability of structures.
- Q:What is the role of steel rebars in minimizing cracking due to shrinkage?
- The role of steel rebars in minimizing cracking due to shrinkage is to provide reinforcement and strength to concrete structures. By placing steel rebars within the concrete, they act as a framework that helps distribute the tensile forces caused by shrinkage. This prevents the concrete from cracking and ensures the overall stability and durability of the structure.
- Q:What are the different types of steel rebars used in road bridges?
- There are primarily three types of steel rebars commonly used in road bridges: carbon steel rebars, epoxy-coated rebars, and stainless steel rebars. Carbon steel rebars are the most widely used type due to their high strength and cost-effectiveness. Epoxy-coated rebars are used in areas prone to corrosion, as the coating protects the steel from moisture and chemicals. Stainless steel rebars, on the other hand, provide excellent resistance to corrosion and are typically used in highly corrosive environments or for aesthetic reasons.
- Q:Can steel rebars be used in structures with limited construction regulations?
- Yes, steel rebars can be used in structures with limited construction regulations. Steel rebars are commonly used in construction due to their high tensile strength and durability. However, it is important to note that even in structures with limited regulations, it is crucial to follow basic safety guidelines and ensure proper engineering and construction practices to ensure the structural integrity and safety of the building.
- Q:How do steel rebars enhance the bond between concrete and reinforcement?
- The bond between concrete and reinforcement is improved by steel rebars through various mechanisms. Firstly, the inclusion of rebars in concrete enhances the mechanical interlock between the two materials. As concrete surrounds the rebars, it fills the spaces between the steel bars, resulting in a strong bond once it solidifies. This mechanical interlock effectively prevents the separation of concrete and reinforcement, particularly when subjected to tensile loads. Secondly, steel rebars augment the bond by offering additional surface area for adhesion. The rough texture of the rebars allows the concrete to firmly grip the steel surface, leading to a stronger bond. This adhesion is further enhanced by the formation of corrosion products on the rebars over time, creating an even rougher surface and increasing the bond strength between the concrete and reinforcement. Thirdly, rebars serve as load transfer devices in concrete structures. When external forces act on the structure, the rebars distribute and transfer these forces to the surrounding concrete. This load transfer mechanism significantly improves the overall structural integrity and performance of the concrete element. Furthermore, steel rebars also reinforce the bond between concrete and reinforcement by their ability to resist deformation. Under tensile loads, the rebars elongate and absorb the stress, preventing the concrete from developing cracks. This prevents the formation of cracks that could compromise the bond between the two materials. To summarize, steel rebars enhance the bond between concrete and reinforcement by providing mechanical interlock, increased surface area for adhesion, load transfer capabilities, and resistance to deformation. Together, these factors contribute to the overall strength, durability, and performance of reinforced concrete structures.
- Q:Are steel rebars susceptible to rusting?
- Yes, steel rebars are susceptible to rusting.
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HRB400 hot-rolled reinforced bar
- Ref Price:
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- Loading Port:
- China Main Port
- Payment Terms:
- TT OR LC
- Min Order Qty:
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- Supply Capability:
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