HRB500 hot rolled ribbed steel bars
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Definition
That is the new standard name for HRB500 steel, grade four steel as the old name, as a kind of hot rolled ribbed bar. In the construction industry, four screw steel is the old saying.
Hot rolled ribbed steel grades by HRB and number of yield points minimumcomposition. H, R, B respectively (Hotrolled), hot rolled ribbed steel bar(Ribbbed), (Bars) the three word's first letter English.
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
The main purposes
HRB500 grade steel in strength, ductility, high temperature resistance, low temperature performance and seismic performance and fatigue performanceare better than HRB400 has greatly improved, mainly used in high-rise and super high-rise building, long span bridges, high standards of construction, is an international engineering standards recommended actively and has been widely used in developed countries products, it shows that the application ofpractice HRB500 steel works, can save a lot of steel, and has obvious economic benefit and social benefit.
The main origin
Screw thread steel producers in China are mainly distributed in North and northeast, North China area such as Shougang, Tang Gang, Xuan Steel,bearing steel, Shanxi Zhongyang steel plant, Baoding Purui the steel, the northeast area such as resistant, Tai, realize, 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, bending deformation properties and process of welding performance. Screw thread steel billet production raw material for the carbon structure steel smelting processing sedation or low alloy structural steel,finished steel for hot rolling, normalizing or hot-rolled state of delivery.
Advantage
Nationwide, the annual if 20000000 t two screw thread steel is four level(HRB500) to replace, can save more than 5000000 t screw thread steeldosage. Equivalent to an annual consumption of iron ore 4000000 ~800 million T, save standard coal 1670000 ~335 million T, less consumption of fresh water 9600000 ~1740 million m3, to reduce dust emissions of sulfur dioxide emissions reduction of 750~1500t, 625~1250t, energy saving and emission reduction effectiveness is huge, consistent with the low carbon environmental protection concept of current international society pay more and more attention.
The promotion of the work
In order to make better performance, more economical and four screw steelproducts of low carbon environmental protection at home and rapidly applied,gradually to replace the two screw steel low level, should do the following aspects of work:
1 wide publicity to introduce four screw steel composition, properties and their own advantages, strengthen the construction design institute relevant indexes of four screw steel chemical composition, mechanical properties and welding performance of the understanding, promote the use of the design of the construction project, to lay a solid foundation for the four screw steel market promotion.
Each of the 2 key projects on strengthening highway, railway, bridge, and a series of infrastructure projects, do a good job of key projects of the bidding work, the realization of the four screw steel supply breakthrough from thelarge-scale key projects, the formation of a demonstration effect on other common construction project and the real estate industry, and graduallypenetrated into all fields of thread steel application, so as to fully replace thelow grade screw thread steel.
- Q: Are steel rebars suitable for use in structures with high impact resistance requirements?
- High tensile strength and the ability to withstand heavy loads make steel rebars a common choice in construction. However, they may not be suitable for structures with high impact resistance requirements. Although steel rebars are strong, they do not possess the same level of impact resistance as materials like fiberglass or carbon fiber. For structures that are exposed to heavy impact loads, such as bridges, earthquake-resistant buildings, or structures at risk of collisions with heavy machinery or vehicles, alternative materials may be more appropriate. For instance, fiberglass rebars offer improved impact resistance due to their flexibility and capacity to absorb energy without breaking. Moreover, they have a higher strength-to-weight ratio compared to steel rebars. In contrast, carbon fiber rebars have exceptional impact resistance and are commonly utilized in aerospace and military applications. In conclusion, while steel rebars are reliable for many structural purposes, structures requiring high impact resistance may benefit from the use of alternative materials like fiberglass or carbon fiber rebars. It is crucial to carefully evaluate the specific needs and demands of the structure to ensure both its durability and safety.
- Q: What are the main uses of threaded steel?
- The main use of rebar is to use beams and columns of important structures as well as bridges. The upper rib is stronger than the round steel when combined with concrete pouring!
- Q: What are the environmental benefits of using steel rebars?
- Using steel rebars in construction projects has several environmental benefits. Firstly, steel rebars are highly durable and long-lasting, which means they have a significantly longer lifespan compared to other materials. This reduces the need for frequent replacements and minimizes the amount of waste generated. Additionally, steel rebars are 100% recyclable, allowing them to be repurposed in new construction projects, reducing the demand for new materials and conserving natural resources. Furthermore, steel production emits fewer greenhouse gases compared to other materials like concrete, contributing to reduced carbon emissions and mitigating climate change. Overall, the use of steel rebars supports a more sustainable and eco-friendly approach to construction.
- Q: Do steel rebars need to be coated with any protective materials?
- Yes, steel rebars typically need to be coated with protective materials to prevent corrosion and extend their lifespan. The most common protective coatings for rebars include epoxy, zinc, or a combination of both. These coatings act as a barrier against moisture, chemicals, and other corrosive elements that can damage the steel over time.
- Q: How to calculate the theoretical elongation of finishing thread steel?
- The grade of prestressed concrete rebar is defined by the yield strength. The code is PHB, plus the minimum value of the specified yield strength. P, H and B are English first letters of Prestressing, Hot and Bars respectively. For example: PHB830 represents a steel bar with a minimum yield strength of 830MPa.
- Q: How do steel rebars contribute to the seismic performance of concrete buildings?
- The seismic performance of concrete buildings is greatly enhanced by steel rebars. These rebars provide reinforcement to the concrete structures, making them more resistant to the powerful forces exerted during an earthquake. Without proper reinforcement, the concrete can crack or collapse under the intense shaking. To strengthen the concrete and mitigate the effects of seismic activity, steel rebars are strategically placed within the concrete, forming a network that increases the tensile strength of the structure. Concrete is strong when compressed but weak when subjected to tension, while steel has excellent tensile strength. By combining the two materials, the rebars effectively distribute the seismic forces throughout the concrete, preventing cracks from spreading and allowing for a more flexible response. Not only do steel rebars improve the tensile strength, but they also enhance the overall stiffness of the structure. This stiffness helps to minimize the building's response to vibrations during an earthquake, reducing the potential for damage. Acting as a backbone, the rebars increase the concrete's resistance to deformation and contribute to the overall structural integrity of the building. Furthermore, steel rebars contribute to the ductility of the structure. Ductility refers to a material's ability to deform under stress without losing its structural integrity. During an earthquake, the building undergoes significant displacement and deformation. Steel rebars allow the concrete to flex and absorb the energy from seismic forces, preventing catastrophic failure. This ductile behavior ensures that the building can withstand the shaking and provides occupants with more time to evacuate safely. In conclusion, steel rebars are essential for improving the seismic performance of concrete buildings. They enhance the tensile strength, stiffness, and ductility of the structure, reducing the risk of damage or collapse during an earthquake. By reinforcing the concrete, steel rebars play a critical role in ensuring the safety and resilience of concrete buildings in areas prone to seismic activity.
- Q: How do steel rebars contribute to the ductility of reinforced concrete structures?
- Steel rebars contribute to the ductility of reinforced concrete structures in several ways. Ductility refers to a material's ability to deform under stress without fracturing. In the case of reinforced concrete structures, steel rebars provide the necessary tensile strength that concrete lacks, enabling the structure to withstand the forces of tension and compression. Firstly, steel rebars effectively resist tensile forces. Concrete is strong in compression but weak in tension. By adding steel rebars within the concrete, the structure gains the ability to withstand tensile stresses. When the concrete is subjected to tension, the rebars carry the load and prevent the concrete from cracking or failing. This enhances the overall ductility of the structure by allowing it to deform and absorb energy without catastrophic failure. Secondly, steel rebars act as reinforcement by distributing applied loads across a wider area. When a reinforced concrete structure is subjected to a load, the stress is transferred from the concrete to the rebars. The rebars distribute this stress throughout the structure, reducing localized concentrations and preventing sudden failure. This redistribution of stress promotes the ductility of the structure by enabling it to flex and absorb energy, rather than experiencing brittle failure. Moreover, steel rebars also provide anchorage and confinement to the concrete. The rebars are typically embedded in the concrete, creating a bond between the two materials. This bond enhances the overall strength and ductility of the structure by preventing the rebars from slipping or pulling out under tension. Additionally, the confinement effect of the rebars prevents the concrete from expanding or spalling under stress, increasing the overall ductility of the reinforced concrete structure. In summary, steel rebars contribute to the ductility of reinforced concrete structures by providing tensile strength, redistributing stress, and offering anchorage and confinement to the concrete. By reinforcing the weak areas of the concrete and allowing for controlled deformation, steel rebars enable the structure to absorb energy and withstand external forces without catastrophic failure.
- Q: Can steel rebars be used in structures subjected to extreme temperatures?
- Yes, steel rebars can be used in structures subjected to extreme temperatures. However, it is important to consider the specific grade and composition of the steel and the temperature range it can withstand without losing its structural integrity. Additionally, certain precautions and appropriate design considerations may be necessary to ensure the performance and durability of the steel rebars in extreme temperature conditions.
- Q: Are steel rebars resistant to termites and other pests?
- Yes, steel rebars are highly resistant to termites and other pests.
- Q: Can steel rebars be used in the construction of museums and art galleries?
- Yes, steel rebars can be used in the construction of museums and art galleries. Steel rebars provide structural support and reinforcement, making them suitable for ensuring the stability and durability of the buildings. Additionally, steel rebars can be designed and installed in a way that minimizes their visual impact, preserving the aesthetic appeal of the museums and art galleries.
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HRB500 hot rolled ribbed steel bars
- 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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