GB HRB400 HRB500 BS4449 ASTM A615 GR40 GR60 steel rebar
- Loading Port:
- China main port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 1000 m.t.
- Supply Capability:
- 19863 m.t./month
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Specification
Rebar called reinforcing bars, steel rebar is metal bars often used in construction for pouring concrete or
supporting walls and columns. The rebar can be smooth, though they are frequently manufactured with
deformations that create greater texture to which concrete can adhere, creating a stronger bond that helps
prevent cracking of concrete. These deformations do not create weaknesses in the rebar, and when rebar
is measured to determine its diameter, it is typically measured at the narrowest point. Strength grades
indicate the amount of pressure the steel rebar can withstand, and grade and diameter are typically presented
in both imperial and metric units
Our Advantage:
High quality steel products from 1 class mills in China
Reasonable price
Professionalism of the products
On-time delivery
Complete documents and certificates
Sincere service to meet our clients' requirements
Product Description :
Chemical composition (%): | Steel | C | Si | Mn | P | S | Ceq | ||||
HRB335 |
0.25 |
0.80 |
1.60 |
0.045 |
0.045 | 0.52 | |||||
HRB400 | 0.54 | ||||||||||
HRB500 | 0.55 | ||||||||||
Mechanical properties | Steel | Rel/ MPa | Rm/ MPa | A/ % | Agt/ % | ||||||
≥ | |||||||||||
HRB335 | 335 | 455 | 17 |
7.5 | |||||||
HRB400 | 400 | 540 | 16 | ||||||||
HRB500 | 500 | 630 | 15 | ||||||||
Package: | Standard export packing or as customer's request | ||||||||||
Application: | Construction, building, bridge, road. ect | ||||||||||
Payment terms | 1).100% irrevocable L/C at sight. | ||||||||||
Delivery time | 15-30 days after receipt of L/C or deposit by T/T | ||||||||||
Features
1、Pure steel quality, stable chemical contents, small tolerance.
2、Constant Quality, good drawing performance.
3、High dimension accuracy degree, accuracy degree of Level C up to 80%, smooth surface, less scale, easy to be pickled.
4、Automatic bundling with 4 lines by Machine in tidy and good looks
5、Big high quality percentage, small coil percentage, and heavy coil weight for Hard Coil.
6、High sorbitizing percentage.
Packing:
In bundles, each bundle weight 3.5 tons. Load by container or by bulk verssel.
Our service
(1) We cooperate with famous factories with advanced equipment and well trained workers.
(2) We can provide factory price with trading company service.
(3) We continuously work on the improvement of our processes, guaranteeing consistently high standards
of quality to keep none compensation.
(4) We guarantee 24 hours response and 48 hours solution providing service.
(5) We accept small order quantity before formal cooperation.
(6) We deliver the agreed quality at the agreed time, reacting to changes in customer wishes in a flexible way.
(7) Due to our volume and selling power, we have excellent freight rates with shipping lines.
(8) We strive to always be fair and honest in our dealings with customers.
(9) We strive to work together with customers to achieve much more than we can achieve alone.
(10) Through our passion and commitment we aim to be a market leader in all our key markets. To maintain
our position as market leader we must continue to add value in all that we do.
FAQ:
1.Q: What's your MOQ(minimum order quantity)?
A: One full container, mixed acceptable .
2. Q: What's your packing methods?
A: Packed in bundle or bulk ..
3. Q: How can I buy CNBM products in my country?
A:Please send us an inquiry or email ,we will reply to you if there is distributor in your country
4. Q: Can we visit your factory?
A: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.
5. Q: How long does it take to get the product if i place an order?
A:With the process of your requirements,we will pack and deliver in 3-7 days. If it is by sea shipment,it will take 15-45 days depending on different locations
- Q: How do steel rebars contribute to the overall durability and service life of concrete structures?
- Concrete structures benefit from the inclusion of steel rebars in several ways, contributing to their overall durability and service life. To begin with, steel rebars are utilized in concrete structures to bolster their tensile strength. While concrete is strong under compression, it lacks strength when subjected to tension. Incorporating steel rebars, which possess high tensile strength, into the concrete significantly increases the overall strength and load-bearing capacity of the structure. This enables the structure to withstand external forces such as wind, earthquakes, or heavy loads, thereby reducing the risk of structural failure and enhancing its overall durability. Additionally, steel rebars play a vital role in preventing cracking and controlling the spread of cracks within concrete structures. As concrete dries and undergoes temperature fluctuations, it has a tendency to shrink and crack. The presence of steel rebars helps to distribute these forces and stresses throughout the structure, minimizing the formation and expansion of cracks. By restricting the propagation of cracks, the rebars contribute to the overall structural integrity and longevity of the concrete structure. Moreover, steel rebars offer reinforcement against corrosion. Concrete possesses high alkalinity, which generates a protective layer known as the passivation layer around the steel rebars. This layer safeguards the rebars from rusting and corroding when exposed to moisture or aggressive chemicals. By preserving the integrity of the rebars, the overall durability and service life of the concrete structure are enhanced. Furthermore, steel rebars are instrumental in improving the structural stability and resilience of concrete structures. By providing reinforcement and rigidity to the concrete, they aid in the even distribution and dissipation of applied loads and stresses. This diminishes the likelihood of localized failure and augments the structure's capability to withstand external forces and deformations. The presence of steel rebars also enhances the structural behavior of the concrete, rendering it more resilient to dynamic forces such as vibrations or impacts. In conclusion, steel rebars make a significant contribution to the overall durability and service life of concrete structures. They enhance the tensile strength of the concrete, prevent cracking and control the propagation of cracks, provide reinforcement against corrosion, and improve structural stability and resilience. By integrating steel rebars into concrete construction, engineers can create robust and long-lasting structures capable of withstanding various challenges, ensuring the safety and longevity of the built environment.
- Q: How are steel rebars protected from fire during construction?
- Steel rebars are typically protected from fire during construction through the application of fire-resistant coatings or by encasing them in fire-resistant materials, such as concrete. These protective measures help to prevent the steel rebars from reaching temperatures that could compromise their structural integrity in the event of a fire.
- Q: How are steel rebars made?
- Steel rebars are made through a process called hot rolling, where steel billets (large chunks of steel) are heated to a malleable temperature and then passed through a series of rollers to shape them into long, cylindrical bars. These bars are then cut to the desired length and surface treated to improve their corrosion resistance.
- Q: Can steel rebars be used in structures with limited maintenance access?
- Structures with limited maintenance access can utilize steel rebars, which are commonly chosen for construction projects due to their exceptional strength and durability. These rebars can endure heavy loads and provide reinforcement to concrete structures. In structures with restricted maintenance access, steel rebars offer numerous benefits. Firstly, they boast a lengthy lifespan and are corrosion-resistant, minimizing the need for frequent maintenance. Unlike wood or aluminum, steel rebars do not decay or rot over time, rendering them suitable for structures that are challenging to reach for regular maintenance. Moreover, steel rebars can be easily examined using non-destructive testing methods like ultrasound or magnetic particle inspection. These techniques can identify any potential flaws or damage in the rebars without invasive measures, thereby ensuring the structural soundness of the building. Furthermore, steel rebars can be designed and installed in a manner that reduces the necessity for future maintenance. For instance, employing epoxy-coated rebars can provide an additional layer of protection against corrosion, prolonging the structure's lifespan and reducing maintenance requirements. However, it is crucial to acknowledge that while steel rebars are highly durable, they are not entirely maintenance-free. Over time, the protective coatings on the rebars may deteriorate, and if left unaddressed, corrosion can occur. Therefore, periodic inspections and maintenance activities must still be conducted, even in structures with limited access. In conclusion, due to their durability, corrosion resistance, and non-invasive inspection capabilities, steel rebars can be employed in structures with limited maintenance access. Nevertheless, regular inspections and maintenance are still necessary to ensure the long-term performance of the rebars and the overall structural integrity of the building.
- Q: What is the effect of high temperatures on steel rebars?
- Steel rebars are significantly affected by high temperatures. When exposed to high temperatures, steel rebars undergo thermal expansion, causing them to increase in size. This expansion can cause cracks or spalling in the surrounding concrete as the larger rebars exert pressure on it. Moreover, high temperatures can weaken and reduce the load-bearing capacity of steel rebars. This weakening phenomenon, known as tempering, occurs when heat compromises the structural integrity of the steel, making it less strong. Consequently, steel rebars exposed to high temperatures may experience reduced strength and become more prone to deformation or failure. Therefore, when designing structures or assessing their integrity, it is crucial to consider the impact of high temperatures on steel rebars, particularly in environments susceptible to heat or fire hazards.
- Q: What are the limitations of using steel rebars?
- Construction projects face several limitations when using steel rebars. To begin with, steel rebars are prone to corrosion. Exposure to moisture and oxygen causes rusting over time, weakening the rebars and compromising the concrete's structural integrity. Protective coatings like epoxy are often applied, but these can degrade and necessitate maintenance. Additionally, steel rebars have a high thermal expansion coefficient, meaning they expand and contract considerably with temperature fluctuations. This can lead to stress and concrete cracking, especially in regions with extreme temperature variations. Engineers often incorporate expansion joints and other methods to accommodate rebars' thermal expansion. Moreover, steel rebars are heavy and can be challenging to handle and transport. Their weight can increase the overall structure's weight, requiring additional support or reinforcement. Additionally, transporting steel rebars to construction sites is costly and time-consuming. Furthermore, steel rebars are a finite resource with environmental consequences. Extracting and producing steel demand significant energy and contribute to greenhouse gas emissions. The depletion of natural resources necessary for steel production is also a concern. Lastly, steel rebars conduct heat and electricity, posing safety risks in certain situations. For instance, in areas prone to lightning strikes, the presence of steel rebars heightens the chances of electrical damage. In conclusion, despite their strength and durability, steel rebars in construction have limitations such as corrosion susceptibility, thermal expansion issues, high weight, environmental impact, and electrical conductivity. Engineers and architects must consider these limitations and implement appropriate measures to address them in construction projects.
- Q: How do steel rebars contribute to the overall durability and service life of concrete structures?
- Steel rebars contribute to the overall durability and service life of concrete structures in several ways. Firstly, they enhance the tensile strength of concrete, which is otherwise weak in tension. By providing reinforcement, rebars help distribute the load evenly, preventing cracks and failure due to excessive stress. Additionally, rebars help to control shrinkage and thermal expansion, minimizing the risk of cracking and ensuring the structural integrity of the concrete. Furthermore, steel rebars are corrosion-resistant, protecting the concrete from the detrimental effects of moisture and other environmental factors. Overall, the presence of steel rebars significantly improves the strength, durability, and longevity of concrete structures.
- Q: What are the guidelines for proper spacing and lapping of steel rebars in concrete structures?
- The guidelines for proper spacing and lapping of steel rebars in concrete structures vary depending on the specific design and structural requirements. However, some general recommendations exist. The rebars should be adequately spaced to ensure proper concrete cover, allowing for corrosion protection and sufficient bond strength. Typically, the minimum spacing between parallel rebars is around 1.5 times the diameter of the larger bar or 25 mm (1 inch), whichever is greater. Lapping, or overlapping, of rebars is necessary to create a continuous load path. The length of the overlap depends on the design and the type of rebar connection being used. It is important to follow the specifications provided by structural engineers and adhere to local building codes to ensure the proper spacing and lapping of rebars in concrete structures.
- Q: Can steel rebars be used in earthquake-resistant structures?
- Yes, steel rebars can be used in earthquake-resistant structures. Steel rebars provide strength and durability to reinforced concrete structures, making them capable of withstanding the forces and vibrations caused by earthquakes. The use of properly designed and placed steel rebars enhances the structural integrity and overall resistance of buildings against seismic events.
- Q: How are steel rebars protected during concrete pouring?
- Steel rebars are typically protected during concrete pouring by using a layer of epoxy coating or corrosion-resistant paint. This protective layer acts as a barrier between the rebar and the concrete, preventing direct contact and reducing the risk of corrosion. Additionally, plastic or foam covers can be used to shield the rebars from the wet concrete, ensuring proper adhesion and preventing damage during the pouring process.
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GB HRB400 HRB500 BS4449 ASTM A615 GR40 GR60 steel rebar
- Loading Port:
- China main port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 1000 m.t.
- Supply Capability:
- 19863 m.t./month
OKorder Service Pledge
OKorder Financial Service
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