Deformed Bar

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Loading Port:: China Main Port

Payment Terms:: TT OR LC

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Product Description:

Specifications of HRB400 Deformed Steel Bar:

Standard	GB	HRB400
Diameter	6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm, 22mm,25mm,28mm,32mm,36mm,40mm,50mm

Length	6M, 9M,12M or as required
Place of origin	Hebei, China mainland
Advantages	exact size, regular package, chemical and mechanical properties are stable.
Type	Hot rolled deformed steel bar
Brand name	DRAGON

Chemical Composition: (Please kindly find our chemistry of our material based on HRB500 as below for your information)

Grade	Technical data of the original chemical composition (%)
	C	Mn	Si	S	P		V
HRB400	≤0.25	≤1.60	≤0.80	≤0.045	≤0.045		0.04-0.12
	Physical capability
	Yield Strength (N/cm²)		Tensile Strength (N/cm²)			Elongation (%)
	≥400		≥570			≥14

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

Diameter(mm)	Section area (mm²)	Mass(kg/m)	Weight of 12m bar(kg)
6	28.27	0.222	2.664
8	50.27	0.395	4.74
10	78.54	0.617	7.404
12	113.1	0.888	10.656
14	153.9	1.21	14.52
16	201.1	1.58	18.96
18	254.5	2.00	24
20	314.2	2.47	29.64
22	380.1	2.98	35.76
25	490.9	3.85	46.2
28	615.8	4.83	57.96
32	804.2	6.31	75.72
36	1018	7.99	98.88
40	1257	9.87	118.44
50	1964	15.42	185.04

Usage and Applications of HRB400 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 HRB400 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:Can steel rebars be used in seismic-resistant construction?: Yes, steel rebars can be used in seismic-resistant construction. Steel rebars provide strength and flexibility to reinforced concrete structures, making them more capable of withstanding seismic forces. They help distribute the energy generated during an earthquake, reducing the chances of structural failure and ensuring the safety of the building and its occupants.

Q:What are steel rebars made of?: Reinforcement bars, commonly known as steel rebars, are primarily composed of carbon steel. Carbon steel is an alloy of iron and carbon, with the addition of small quantities of other elements like manganese, silicon, and copper to enhance its properties. Steel rebars typically contain a carbon content ranging from 0.2% to 0.3%, which imparts the necessary strength and durability needed for reinforcing concrete structures. To shape and size the steel, hot rolling is employed, involving the heating of the material to high temperatures and passing it through rollers. This process enhances the mechanical properties and structural integrity of the rebars, making them suitable for concrete construction applications that necessitate added strength and support.

Q:How do steel rebars resist alkali-silica reaction in concrete?: The primary reason why steel rebars can withstand the alkali-silica reaction in concrete is because of the passive film that forms on their surface and the alkaline environment of the concrete. When steel rebars are embedded in concrete, they develop a passive film on their surface. This film serves as a protective layer that prevents direct contact between the steel and the aggressive alkali-silica reactive aggregates that are present in the concrete. The formation of this passive film is a result of the high pH of the alkaline environment created by the cement in the concrete, which usually has a pH level of 12-13. This high pH aids in the creation of an oxide layer on the surface of the steel rebar, effectively shielding it from the reactive elements in the aggregates. Moreover, the alkaline environment of the concrete plays a crucial role in maintaining the passivity of the steel rebars. The alkalinity of the concrete enables the passive film to remain stable and intact, providing a continuous barrier against the alkali-silica reaction. As long as the pH of the concrete remains high, the steel rebars will continue to resist the reaction. It is important to note that the thickness and quality of the passive film on the steel rebars are vital in guaranteeing their resistance to the alkali-silica reaction. Any factors that can compromise the integrity of this film, such as carbonation or chloride contamination, can increase the risk of the reaction occurring. In conclusion, the resistance of steel rebars to the alkali-silica reaction in concrete is primarily due to the presence of a passive film on their surface, which is formed by the alkaline environment of the concrete. This film functions as a protective barrier, preventing direct contact between the steel and the reactive aggregates and minimizing the likelihood of the reaction occurring.

Q:How are steel rebars used in the construction of airports?: Steel rebars are used in the construction of airports to reinforce and strengthen concrete structures such as runways, taxiways, terminal buildings, and other infrastructure. These rebars are embedded within the concrete to provide tensile strength and prevent cracking, ensuring the structural integrity and durability of the airport facilities.

Q:What are the different types of steel rebars used in tunnel constructions?: In tunnel constructions, various types of steel rebars are used to enhance the structural integrity and strength of the tunnels. These rebars are crucial components that provide reinforcement and stability to the tunnel structures. Here are some of the different types of steel rebars commonly used in tunnel constructions: 1. Mild Steel Rebars: Mild steel rebars, also known as black or carbon steel rebars, are the most commonly used type of rebars in tunnel constructions. They are cost-effective and possess adequate strength to meet the structural requirements of tunnels. 2. High-Strength Steel Rebars: High-strength steel rebars, also referred to as tension steel, have enhanced tensile strength, making them ideal for tunnel constructions where high load-bearing capabilities are required. These rebars are typically made from alloys such as ASTM A615 Grade 80 or ASTM A706 Grade 80. 3. Stainless Steel Rebars: Stainless steel rebars are corrosion-resistant and offer excellent durability in harsh tunnel environments. They are commonly used in tunnel constructions where corrosion protection is essential, such as in marine or coastal areas. 4. Epoxy-Coated Rebars: Epoxy-coated rebars are regular mild steel rebars with an epoxy coating applied to protect them from corrosion. They are commonly used in tunnel constructions where the tunnels are exposed to moisture, chemicals, or other corrosive elements. 5. Galvanized Rebars: Galvanized rebars are coated with a layer of zinc to protect them from corrosion. They are commonly used in tunnel constructions where the tunnels are exposed to moisture or in areas with high humidity levels. 6. Fiberglass Rebars: Fiberglass rebars, also known as GFRP (Glass Fiber Reinforced Polymer) rebars, are non-corrosive and lightweight. They are used in tunnel constructions where weight reduction is a critical factor or in areas with high electromagnetic interference. 7. Carbon Fiber Rebars: Carbon fiber rebars, also known as CFRP (Carbon Fiber Reinforced Polymer) rebars, possess high tensile strength and are corrosion-resistant. They are commonly used in tunnel constructions where high tensile strength and resistance to chemical or environmental degradation are required. The selection of the appropriate type of steel rebar for tunnel constructions depends on various factors such as load-bearing requirements, exposure to corrosion, environmental conditions, and project budget. Consulting with structural engineers or construction experts is advised to ensure the optimal choice of steel rebars for tunnel projects.

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:How do steel rebars affect the constructability of projects in environmentally sensitive areas?: Steel rebars can have both positive and negative impacts on the constructability of projects in environmentally sensitive areas. On one hand, steel rebars are widely used in construction due to their high strength and durability. They provide structural integrity and enhance the overall safety and stability of buildings and infrastructure. In environmentally sensitive areas, where projects may face challenges such as high wind or seismic activity, steel rebars play a crucial role in ensuring the resilience and longevity of structures. They enable the construction of robust foundations and reinforcements that can withstand natural forces, reducing the risk of damage to the environment. Furthermore, steel rebars can contribute to the sustainability of projects in environmentally sensitive areas. They are highly recyclable, meaning that they can be reused or repurposed at the end of their lifecycle. This reduces the demand for new raw materials and minimizes the environmental impact associated with extracting and processing resources. By incorporating steel rebars into construction projects, the carbon footprint can be reduced, aligning with the goals of environmental conservation. However, the use of steel rebars can also have negative implications in environmentally sensitive areas. The production of steel involves the emission of greenhouse gases, contributing to climate change. This can be a significant concern in regions with fragile ecosystems or vulnerable species. Additionally, the extraction of iron ore, the primary raw material for steel production, can result in habitat destruction and deforestation, further impacting the environment. Moreover, the transportation of steel rebars to construction sites in environmentally sensitive areas can also pose challenges. It often requires the use of heavy machinery and vehicles, which can cause soil compaction and erosion if not properly managed. This can disrupt natural habitats and affect the water quality of nearby rivers and streams. In summary, while steel rebars provide numerous benefits to the constructability of projects in environmentally sensitive areas, they also pose environmental challenges. It is essential for construction companies and project stakeholders to carefully consider the sourcing, production, and transportation of steel rebars, as well as explore alternative construction materials and techniques that have less impact on the environment. By adopting sustainable practices, such as recycling steel rebars and minimizing carbon emissions, the constructability of projects in environmentally sensitive areas can be improved while mitigating their potential negative effects on the environment.

Q:Can steel rebars be used in offshore platform construction?: Yes, steel rebars can be used in offshore platform construction. They are commonly used as reinforcement in concrete structures, providing strength and durability to withstand the harsh offshore environment and support the weight and loads of the platform.

Q:Why is the earthing device forbidden to use thread steel instead of round steel as lap steel bar?: H, R, and B are the first letters in English for hot-rolled (Hotrolled), ribbed (Ribbed) and reinforced (Bars) three words. Hot rolled ribbed bar is divided into two levels, HRB335 (old No. 20MnSi), three HRB400 (20MnSiV, 20MnSiNb, old No. 20Mnti), four grade HRB500 three grade.

Q:What are the common misconceptions about steel rebars?: Steel rebars are often mistakenly thought to be exclusively used in large construction projects. While they are indeed commonly employed in the construction of big buildings, bridges, and other infrastructure, they are also utilized in smaller endeavors such as residential homes, retaining walls, and even garden structures. By providing strength and reinforcement to concrete structures, rebars ensure the durability and longevity of these constructions. Another misconception pertains to the assumption that all rebars are identical. In reality, there are numerous types of rebars available, each possessing unique characteristics and serving specific purposes. Some common variations include carbon steel rebars, epoxy-coated rebars, stainless steel rebars, and galvanized rebars. The particular type selected depends on factors such as the environment, exposure to corrosive elements, and project requirements. Additionally, there is a misconception that rebars can be haphazardly placed or spaced within a concrete structure. However, improper placement or inadequate spacing of rebars can result in structural weaknesses, compromising the integrity of the concrete. It is essential to adhere to engineering specifications and guidelines to ensure that the rebars are correctly positioned and spaced, thus providing optimal reinforcement. Furthermore, there is a belief that steel rebars are prone to rusting. While it is accurate that steel can corrode when exposed to moisture and oxygen, construction practices can greatly mitigate this risk. For instance, the use of epoxy-coated or galvanized rebars offers an additional layer of protection against corrosion. Additionally, appropriate concrete cover and the application of protective coatings can prevent moisture penetration and prolong the lifespan of the rebars. Lastly, some individuals argue that steel rebars are costly and not cost-effective. Although it is true that steel rebars can contribute to the overall expenses of a construction project, they are an indispensable investment in ensuring structural integrity and safety. The cost of repairing or replacing a structure due to insufficient reinforcement far exceeds the initial investment in quality rebars. Furthermore, the use of rebars can reduce the need for excessive concrete, resulting in cost savings in terms of materials and construction time. In conclusion, it is imperative to debunk prevailing misconceptions surrounding steel rebars. They are not solely limited to large construction projects, they come in various types, necessitate proper placement and spacing, can be safeguarded against corrosion, and represent a cost-effective investment in guaranteeing the durability and safety of concrete structures.

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