HRB400 GB Steel Rebar

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Loading Port:: China Main Port

Payment Terms:: TT OR LC

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Supply Capability:: -

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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 Construction

1. Construction steel round bar is mostly used for straight bundles supply, and used for steel, bolts and various mechanical parts. While the bigger round bar, or more than 25mm hot rolled bar, is mainly for the manufacture of mechanical parts or for seamless steel billet.

2. Steel round bar is used in construction and a large number of architectural and engineering structures.

3. Besides, we can supply some especial material steel round bar that can be used for main shaft of steamer, hummer shank, with big section and supper force.

Packaging & Delivery

Packaging Detail: All goods are packed in bundle with steel strips and shipped by break bulk vessel or container (depend on target market and different ports)

Delivery Detail: 45 days

Trade terms: FOB, CFR, CIF

MOQ: 25 tons per specification; we can negotiate the quantity if the specification is normal or we have stock of one specification.

Weight: Theprice invoicing on theoretical weight basis or actual weight basis depends on customer’s request.

Shipment: The shipment of bulk break or container is depends on customer’s request and the situation of the port of destination.

Documents given: Full set of original clean on board bill of lading; Original signed commercial invoice; Original packing list; Policy of insurance; Certificate of origin and what the target market needs.

Q: What are the main factors affecting the formability of alloy steel billets?: Several key factors influence the formability of alloy steel billets, which refers to their ability to be shaped or formed without cracking or fracturing. 1. The alloy composition of steel billets plays a significant role in determining their formability. Different alloying elements, such as carbon, manganese, chromium, and nickel, can alter the mechanical properties of the steel. Higher levels of certain elements can improve formability, while excessive amounts can lead to brittleness and reduced formability. 2. The grain size and structure of the steel billets also affect formability. Fine-grained structures have better formability compared to coarser grain sizes. This is because fine grains allow for more uniform deformation and reduce the likelihood of localized strain concentration, which can lead to cracking. 3. The temperature at which the steel billets are processed greatly influences their formability. Generally, higher temperatures enhance the material's ductility and ability to deform without cracking. This is due to the reduction in the material's yield strength and increased plasticity. However, excessively high temperatures can also lead to excessive grain growth and decreased formability. 4. The rate at which the steel billets are deformed, known as the strain rate, is another important factor. Higher strain rates can result in reduced formability, as the material may not have sufficient time to accommodate the deformation before fracture occurs. Controlling the strain rate during forming processes is crucial to ensure optimal formability. 5. The use of lubricants during the forming process can significantly improve the formability of steel billets. Lubricants reduce friction between the material and the forming tools, minimizing the risk of sticking or tearing. They also help dissipate heat generated during deformation, preventing excessive temperature rise that can negatively impact formability. 6. The specific method used to shape the steel billets can also affect formability. Different processes, such as forging, rolling, or extrusion, impose varying levels of strain and stress on the material. Each process has its own limitations and requirements for optimal formability, and selecting the appropriate forming method is crucial to achieve the desired shape without compromising the material's integrity. In conclusion, understanding and controlling the alloy composition, grain size and structure, temperature, strain rate, lubrication, and chosen forming process are essential for achieving the desired shape and avoiding defects or failures during the forming of alloy steel billets.

Q: Can steel billets be cast from recycled steel?: Yes, steel billets can be cast from recycled steel.

Q: What are the different methods of steel billet inspection?: There are several methods of steel billet inspection, including visual inspection, ultrasonic testing, magnetic particle inspection, eddy current testing, and X-ray inspection.

Q: How do steel billets contribute to the manufacturing of marine gear?: Steel billets contribute to the manufacturing of marine gear by serving as the raw material for the production of various components, such as gears, shafts, and bearings. These billets are first heated and then shaped through forging or machining processes to create the desired gear components with high strength and durability. The use of steel billets ensures that the marine gear can withstand the harsh conditions of marine environments, such as corrosion, high loads, and extreme temperatures, ultimately enhancing the performance and reliability of the gear in marine applications.

Q: What are the different heat treatment processes for alloy steel billets?: There are several different heat treatment processes for alloy steel billets, including annealing, normalizing, quenching, and tempering. Annealing involves heating the billets to a high temperature and then slowly cooling them to relieve internal stresses and improve ductility. Normalizing is similar to annealing but involves air cooling instead of slow cooling. Quenching involves rapidly cooling the billets in a liquid medium, such as oil or water, to increase hardness and strength. Tempering is done after quenching and involves reheating the billets to a specific temperature and then cooling them slowly to reduce brittleness and improve toughness.

Q: What are the disadvantages of using steel billets?: Some potential disadvantages of using steel billets include their high cost, the need for specialized equipment and processes to handle and shape them, and their relatively limited availability compared to other forms of steel. Additionally, steel billets can be susceptible to defects such as cracking or porosity, which may require additional quality control measures.

Q: What are the different types of steel billet forming processes?: The different types of steel billet forming processes include hot rolling, cold rolling, extrusion, forging, and casting.

Q: What are the main factors affecting the surface quality of steel billets?: The main factors affecting the surface quality of steel billets include the cleanliness of the raw materials used in the production process, the temperature and composition of the molten steel, the cooling rate during solidification, the presence of impurities or defects, and the handling and storage conditions during transportation and storage.

Q: What are the different types of steel billet forging machines?: There are several different types of steel billet forging machines available in the market today. These machines are designed to efficiently shape and form steel billets into desired shapes and sizes. Here are some of the common types of steel billet forging machines: 1. Hydraulic Forging Press: This type of machine uses hydraulic power to exert force on the steel billet, allowing it to be forged into the desired shape. Hydraulic forging presses are known for their high force capabilities and versatility in handling different sizes of billets. 2. Mechanical Forging Press: Mechanical forging presses use mechanical power, such as flywheels or eccentric mechanisms, to exert force on the billet. These machines are known for their reliability and precision, making them suitable for high-volume production. 3. Screw Press: Screw presses utilize a rotating screw mechanism to apply force on the steel billet. They are characterized by their high-speed operation and efficient energy usage. Screw presses are commonly used for forging small to medium-sized billets. 4. Hammer Forging Machine: Hammer forging machines use a hammering action to shape the steel billet. There are various types of hammer forging machines, including steam hammers, air hammers, and hydraulic hammers. These machines are known for their high impact force, making them suitable for heavy-duty forging. 5. Upsetter: Upsetters, also known as upsetting machines, are specifically designed for forging the ends of steel billets. They use a vertical or horizontal ram to apply pressure on the billet, causing it to increase in diameter and length. Upsetters are commonly used for producing forged components with thickened ends. 6. Radial Forging Machine: Radial forging machines employ a rotating roller to apply radial force on the steel billet. This force causes the billet to increase in diameter while maintaining its original length. Radial forging machines are often used for producing seamless rings and other cylindrical components. It's important to note that the choice of the most suitable steel billet forging machine depends on factors such as the size and shape of the billet, desired production volume, and specific requirements of the final product. Each type of machine has its own advantages and limitations, so it is crucial to consider these factors when selecting the appropriate forging machine for a given application.

Q: What is the difference between steel billets and steel bars?: Steel billets and steel bars, two semi-finished products made from steel, exhibit distinct dissimilarities. To begin with, steel billets possess larger dimensions compared to steel bars. Billets typically assume a square or rectangular form with a cross-sectional area ranging from 36 to 216 square inches. Their production commonly involves the continuous casting process, which entails pouring molten steel into molds, followed by cooling and solidification. Billets function as the initial material for various steel products, including bars, rods, and wire. Conversely, steel bars display smaller proportions and adhere to more standardized shapes. Their configuration can be round, square, hexagonal, or flat, contingent upon their intended application. The production of steel bars chiefly involves the hot rolling method, wherein billets undergo heating and are subsequently passed through a series of rolling mills to achieve the desired dimensions and shape. Bars frequently find use in construction, manufacturing, and other industries that prioritize strength and durability. Another disparity between steel billets and steel bars resides in their surface finish. The casting process renders steel billets with a rough mill-scale surface. In contrast, steel bars possess a smoother surface finish, achieved through hot rolling and subsequent finishing procedures such as peeling, grinding, or polishing. Moreover, steel billets primarily serve as raw materials for further processing, while steel bars represent the final product that can be directly employed in diverse applications. Steel bars commonly feature in construction projects as reinforcement for concrete structures, in machinery and tool production, as well as in the manufacturing of automotive parts, among numerous other industrial applications. In conclusion, steel billets and steel bars differ in terms of size, shape, surface finish, and purpose. Billets are larger, rougher, and act as the starting point for various steel products, whereas bars are smaller, boast a smoother surface finish, and emerge as the final product utilized across a wide array of applications.

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