Deformed steel bar HPB400;HPB500 System 1

Deformed steel bar HPB400;HPB500

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 1000 m.t.

Supply Capability:: 10000 m.t./month

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Product Description:

Specifications of Deformed Steel Bar:

Standard	GB	HRB335, HRB400, HRB500
	UK	G460B, B500A, B500B,B500C
	USA	GR40, GR60
Diameter	6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm, 22mm,25mm,28mm,32mm,36mm,40mm,50mm
Diameter
Length	6M, 9M,12M or as required
Place of origin	Hebei, China mainland
Application	building,construction,road,bridge etc
Brand name	DRAGON

Theoretical weight and section area of each diameter as below for your information:

Diameter(mm)	Section area (mm²)	Mass(kg/m)
6	28.27	0.222
8	50.27	0.395
10	78.54	0.617
12	113.1	0.888
14	153.9	1.21
16	201.1	1.58
18	254.5	2.00
20	314.2	2.47
22	380.1	2.98
25	490.9	3.85
28	615.8	4.83
32	804.2	6.31
36	1018	7.99
40	1257	9.87
50	1964	15.42

Usage and Applications of Deformed Steel Bar:

Deformed bar is widely used in buildings, bridges, roads and other engineering construction. Big to highways, railways, bridges, culverts, tunnels, public facilities such as flood control, dam, small to housing construction, beam, column, wall and the foundation of the plate, deformed bar is an integral structure material. With the development of world economy and the vigorous development of infrastructure construction, real estate, the demand for deformed bar will be larger and larger..

Packaging & Delivery of Deformed Steel Bar:

Packaging Detail: products are packed in bundle and then shipped by container or bulk vessel, deformed bar is usually naked strapping delivery, when storing, please pay attention to moisture proof. The performance of rust will produce adverse effect.

Each bundle weight: 2-3MT, or as required

Payment term: TT or L/C

Delivery Detail: within 45 days after received advanced payment or LC.

Label: to be specified by customer, generally, each bundle has 1-2 labels

Trade terms: FOB, CFR, CIF

Q: How do steel rebars resist alkali-silica reaction in concrete?: Steel rebars resist alkali-silica reaction in concrete by serving as a barrier that prevents direct contact between the alkalis present in the concrete and the reactive silica aggregates. The protective oxide layer formed on the surface of the rebars acts as a physical and chemical barrier, preventing the alkalis from penetrating and reacting with the aggregates. Additionally, the high pH environment created by the concrete also helps in passivating the steel rebars, further enhancing their resistance to alkali-silica reaction.

Q: Are there any international standards for steel rebars?: Yes, there are several international standards for steel rebars. The most widely recognized standard is the ISO 6935-2, which provides specifications for steel rebars used in reinforced concrete structures. Additionally, the American Society for Testing and Materials (ASTM) has its own set of standards, such as ASTM A615 and ASTM A706, which are widely adopted in North America and many other countries. Other international standards include the European standard EN 10080 and the British standard BS 4449. These standards ensure quality, strength, and compatibility of steel rebars across different regions.

Q: What is the difference between hot-rolled and cold-worked steel rebars?: The main difference between hot-rolled and cold-worked steel rebars lies in the manufacturing process. Hot-rolled steel rebars are produced by heating the steel billets to high temperatures and then passing them through rolling mills to create the desired shape and size. This process results in a rougher surface and higher yield strength compared to cold-worked steel rebars. On the other hand, cold-worked steel rebars are made by subjecting the hot-rolled steel bars to additional processing steps, such as cold drawing or cold rolling. This process enhances the mechanical properties of the steel, including improved tensile strength, dimensional accuracy, and a smoother surface finish. In summary, hot-rolled steel rebars are formed through high-temperature rolling, while cold-worked steel rebars undergo additional steps to further refine their properties, resulting in a smoother surface and improved mechanical strength.

Q: How do steel rebars prevent concrete structures from spalling?: The reinforcement and increased strength provided by steel rebars prevent spalling in concrete structures. Spalling occurs when the concrete surface cracks and breaks off due to internal pressure from factors like temperature changes, moisture, or structural loads. When steel rebars are embedded in the concrete, they act as a support system that evenly distributes applied loads throughout the structure. This prevents localized stress concentrations, which can cause spalling, by absorbing and dissipating the load. By reinforcing the concrete, rebars enhance its ability to withstand external forces and improve its tensile strength. Furthermore, steel rebars help control crack formation in the concrete. Concrete is a brittle material with low tensile strength, making it prone to cracking under stress. However, rebars hinder crack propagation by bridging them and transferring the stress to the surrounding concrete. This prevents the cracks from spreading and results in a more durable and resilient structure. Additionally, steel rebars protect against corrosion. Concrete's natural alkalinity forms a protective layer on the steel surface, preventing rusting. This alkaline environment acts as a barrier against corrosion, ensuring the rebars maintain their structural integrity over time. By avoiding corrosion, the rebars can continue to reinforce the concrete and prevent spalling. In conclusion, steel rebars are essential in preventing spalling in concrete structures by providing reinforcement, improving tensile strength, controlling crack formation, and protecting against corrosion. They enhance the stability and durability of the concrete, allowing it to withstand external pressures and maintain its integrity for an extended period.

Q: What are the factors that affect the cost of steel rebars?: The factors that affect the cost of steel rebars include the current market demand and supply dynamics, the cost of raw materials such as iron ore and scrap metal, energy costs, transportation costs, labor costs, manufacturing processes and technologies employed, government regulations and tariffs, and currency exchange rates. Additionally, global economic conditions, geopolitical events, and natural disasters can also impact the cost of steel rebars.

Q: What are the advantages of using steel rebars over other materials?: There are several advantages of using steel rebars over other materials. Firstly, steel rebars have high tensile strength, which makes them extremely durable and capable of withstanding heavy loads and forces. Secondly, they have excellent bonding properties with concrete, ensuring a strong and reliable reinforcement system. Additionally, steel rebars are resistant to corrosion, which extends their lifespan and reduces maintenance costs. Lastly, steel rebars are readily available and cost-effective, making them a popular choice in construction projects.

Q: What is the role of steel rebars in reducing concrete shrinkage?: Steel rebars play a crucial role in reducing concrete shrinkage by providing reinforcement and controlling cracking. When embedded within the concrete, rebars help distribute stress and prevent the formation of large cracks. This reinforcement enhances the structural integrity of the concrete and minimizes shrinkage, leading to a more durable and stable construction material.

Q: How do steel rebars improve the ductility of concrete?: Concrete's ductility is enhanced by steel rebars in several ways. Firstly, the distribution and dissipation of stress throughout the concrete structure is facilitated by the presence of rebars. This prevents the concentration of loads in specific areas, thus preventing cracks or fractures and improving overall ductility. Secondly, when concrete undergoes tension or bending forces, rebars act as reinforcement to resist these forces. The tensile strength of steel rebars is higher compared to concrete, which is weak in tension. This reinforcement allows concrete to withstand higher tensile stresses without breaking, thereby increasing ductility. Furthermore, the bond between steel rebars and the concrete matrix plays a crucial role in improving ductility. The rough surface of rebars provides better adhesion with the surrounding concrete, increasing stress transfer between the two materials. This bond ensures that rebars do not slip out of the concrete during deformation, maintaining structural integrity and enhancing the ductility of the composite material. Additionally, the presence of steel rebars contributes to the post-cracking behavior of concrete. When cracks develop under high loads, rebars help hold the concrete together and prevent further crack propagation. This post-cracking behavior enables concrete to maintain its load-bearing capacity even in a damaged state, thereby improving overall ductility. In conclusion, steel rebars improve concrete's ductility by distributing stress, resisting tension and bending forces, enhancing the bond between concrete and rebars, and providing post-cracking reinforcement. These combined effects result in a more flexible and durable concrete structure capable of withstanding deformation without catastrophic failure.

Q: Can steel rebars be used in retaining walls and dams?: Yes, steel rebars can be used in retaining walls and dams. Steel rebars are commonly used in construction projects to reinforce concrete structures, including retaining walls and dams. The rebars provide added strength and stability to the structures, helping them withstand the pressure and forces exerted on them.

Q: How do steel rebars affect the overall structural integrity of a building?: Steel rebars play a crucial role in enhancing the overall structural integrity of a building. By reinforcing and strengthening concrete structures, rebars effectively distribute loads and resist tension, preventing cracks and structural failures. This reinforcement enables buildings to withstand various forces, such as earthquakes and high winds, ensuring their stability and durability over time.

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