Hot Rolled Square Bar with High Quality of Grade Q235，Q275
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT or LC
- Min Order Qty:
- 3000 m.t.
- Supply Capability:
- 100000 m.t./month
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Product Description:
OKorder is offering Hot Rolled Square Bar with High Quality of Grade Q235，Q275 at great prices with worldwide shipping. Our supplier is a world-class manufacturer of steel, with our products utilized the world over. OKorder annually supplies products to European, North American and Asian markets. We provide quotations within 24 hours of receiving an inquiry and guarantee competitive prices.
Product Applications:
Hot Rolled Square Bar with High Quality of Grade Q235，Q275 are ideal for structural applications and are widely used in the construction of buildings and bridges, and the manufacturing, petrochemical, and transportation industries.
Product Advantages:
OKorder's Hot Rolled Square Bar with High Quality of Grade Q235，Q275 are durable, strong, and resist corrosion.
Main Product Features:
· Premium quality
· Prompt delivery & seaworthy packing (30 days after receiving deposit)
· Corrosion resistance
· Can be recycled and reused
· Mill test certification
· Professional Service
· Competitive pricing
Product Description:
-Standard: Q235 Q275
--Chemical Composition:
Standard | Grade | Element (%) | ||||
GB | Q235/275 | C | Mn | S | P | Si |
0.06~0.12 | 0.25~0.50 | ≤0.050 | ≤0.045 | ≤0.30 | ||
Measures of HR Square Bar (small measures):
(Section of HR Square Bar)
-Length of a side and Theoretical weight of Square Bar.
Length of a side(mm) | Theoretical weight(kg/m) | Length of a side(mm) | Theoretical weight(kg/m) |
7 | 0.385 | 22 | 3.80 |
8 | 0.502 | 24 | 4.52 |
9 | 0.636 | 25 | 4.91 |
10 | 0.785 | 26 | 5.30 |
11 | 0.950 | 28 | 6.15 |
12 | 1.13 | 30 | 7.06 |
13 | 1.33 | 32 | 8.04 |
14 | 1.54 | 34 | 9.07 |
15 | 1.77 | 36 | 10.17 |
16 | 2.01 | 38 | 11.24 |
17 | 2.27 | 40 | 12.56 |
18 | 2.54 | 42 | 13.85 |
19 | 2.82 | 45 | 15.90 |
20 | 3.14 | 48 | 18.09 |
21 | 3.46 | 50 | 19.63 |
Notes:
1, The theoretical weights in the list, base on the density of 7.85 g/cm3.
2, Formula for theoretical weight of Square bar: (length of a side)2 * 0.00785
3, The numbers with ＊mean that they are not regular or we don’t offer them.
-Regular length of Square Bar:
Steel | Length of a side (mm) | Length of steel (m) |
Normal steel | < 25 | 4~10 |
> 25 | 3~9 | |
Steel of high quality | All measure | 2~6 |
Tool steel >75 | 1~6 |
Usage/Applications of HR Square Bar:
-The Square Bar is normally used as structure steel.
-Row material for other structure steel like steel angles, channels, I-beams, H-beams, etc…
Packaging & Delivery of HR Square Bar:
-Packing Detail: The products can be packed in bundles by steel wires.
-Marks: We make tag marks and color marks. The tag marks with white background and red company logo will be tied up to each bundle of the products. The information is usually including basic information of products and company and other information requested by customers. As for color marks, we will paint both ends of bundles to make sure that it will be more convenient for customers to distinguish them from other products.
-Delivery Detail: 30~45 working days after receive buyer’s T.T. or L/C.
Transportation:
-The products can be delivered by bulk vessel or by container. As for container, products with the length of 6m will be loaded in 20’ container, with 9m or 12m, in 40’ container.
-The maximum quantity of loading of container is 25 tons.
-The products are usually transported to the nearest port from the production place.
FAQ:
Q1: Why buy Materials & Equipment from OKorder.com?
A1: All products offered byOKorder.com are carefully selected from China's most reliable manufacturing enterprises. Through its ISO certifications, OKorder.com adheres to the highest standards and a commitment to supply chain safety and customer satisfaction.
Q3: How soon can we receive the product after purchase?
A3: Within three days of placing an order, we will begin production. The specific shipping date is dependent upon international and government factors, but is typically 7 to 10 workdays.
Q4: What makes stainless steel stainless?
A4: Stainless steel must contain at least 10.5 % chromium. It is this element that reacts with the oxygen in the air to form a complex chrome-oxide surface layer that is invisible but strong enough to prevent further oxygen from "staining" (rusting) the surface. Higher levels of chromium and the addition of other alloying elements such as nickel and molybdenum enhance this surface layer and improve the corrosion resistance of the stainless material.
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- Q:What are the different types of defects that can occur in steel billets?
- There are several types of defects that can occur in steel billets. These defects can occur during the manufacturing process or as a result of external factors. Some of the common types of defects include: 1. Surface defects: These defects occur on the outer surface of the billet and can include scratches, pits, scabs, scale, and cracks. Surface defects can be caused by handling, improper cooling, or contamination during manufacturing. 2. Internal defects: These defects occur within the body of the billet and are not visible on the surface. They can include voids, porosity, inclusions, and segregation. Internal defects can be caused by improper solidification, improper casting, or impurities in the steel. 3. Dimensional defects: These defects occur when the billet does not meet the desired dimensions or tolerances. Dimensional defects can include variations in length, width, thickness, or straightness. These defects can be caused by improper rolling, uneven cooling, or misalignment of the equipment. 4. Mechanical defects: These defects affect the mechanical properties of the steel billet. They can include improper grain structure, low hardness, brittleness, or poor toughness. Mechanical defects can occur due to improper heat treatment, incorrect alloy composition, or inadequate rolling processes. 5. Weld defects: In case of welded billets, defects related to the welding process can occur. These defects can include lack of fusion, incomplete penetration, porosity, or cracks in the weld zone. Weld defects can be caused by improper welding parameters, inadequate preparation, or contamination during the welding process. It is important to detect and address these defects to ensure the quality and integrity of the steel billets. Various inspection techniques such as visual inspection, ultrasonic testing, magnetic particle testing, or radiographic testing can be employed to identify and classify these defects.
- Q:How do steel billets compare to other forms of raw steel material?
- Steel billets are a specific form of raw steel material that offer distinct advantages compared to other forms of steel. Firstly, steel billets are known for their high strength and durability. They are produced through a carefully controlled process that ensures a uniform composition and a consistent grain structure, resulting in superior mechanical properties. This makes steel billets ideal for applications that require strong and reliable steel, such as construction, automotive, and manufacturing industries. Furthermore, steel billets offer excellent machinability. Their regular shape and size make them easier to handle and process, reducing wastage and improving efficiency during production. This is particularly beneficial for manufacturers who rely on precision machining techniques to create intricate and complex components. Another advantage of steel billets is their versatility. They can be forged, rolled, or extruded into various shapes and sizes, allowing for customization according to specific requirements. This versatility makes steel billets suitable for a wide range of applications, from structural beams and bars to pipes and rods. Moreover, steel billets have a relatively low carbon content, which makes them more ductile compared to other forms of raw steel material. This increased ductility allows for easier shaping and forming, making steel billets particularly suitable for hot working processes like forging and rolling. In summary, steel billets offer numerous advantages compared to other forms of raw steel material. Their high strength, excellent machinability, versatility, and ductility make them a preferred choice for many industries. Whether it's for structural purposes or manufacturing complex components, steel billets provide the necessary properties and flexibility to meet a wide range of requirements.
- Q:What is the role of steel billets in the manufacturing of railway wheels?
- The production of railway wheels heavily relies on steel billets, which serve as the primary raw material. These billets are crucial in creating wheels that possess exceptional strength, durability, and the ability to endure heavy loads, extreme temperatures, and constant wear and tear. To begin with, steel billets undergo a melting process and are then shaped into a cylindrical form, similar to the final shape of the railway wheel. Subsequently, these billets go through a series of manufacturing steps, including hot rolling, forging, and machining, to achieve the desired shape and dimensions of the railway wheel. One of the key advantages of using steel billets lies in their remarkable strength and toughness. Steel is widely recognized for its exceptional mechanical properties, such as high tensile strength and hardness. These characteristics are indispensable for railway wheels, as they need to bear immense loads and resist deformation even under extreme pressures. Furthermore, steel billets provide the necessary metallurgical properties essential for railway wheels. They can be alloyed with additional elements like carbon, manganese, and chromium to enhance their strength, hardness, and resistance to corrosion and fatigue. This ensures that the railway wheels maintain their structural integrity and performance over an extended period. In conclusion, steel billets play a fundamental role in the manufacturing process of railway wheels. They provide the raw material needed to create robust, durable, and dependable wheels that can withstand the challenging conditions of railway operations. By utilizing steel billets, railway wheels are able to meet the strict safety, performance, and longevity requirements of the transportation industry.
- Q:What is the role of steel billets in the construction of dams and reservoirs?
- Steel billets play a crucial role in the construction of dams and reservoirs. These billets, which are semi-finished steel products, serve as the primary raw material for manufacturing various components and structures needed in the construction process. One of the main applications of steel billets in dam and reservoir construction is for the production of reinforced concrete. Reinforced concrete is a composite material that combines the strength and durability of steel with the moldability and versatility of concrete. Steel billets are used to produce steel reinforcement bars, commonly known as rebars, which are embedded within the concrete to enhance its tensile strength and prevent cracking under heavy loads. These rebars provide structural support to the dam or reservoir, ensuring its stability and longevity. Additionally, steel billets are utilized in the fabrication of gates, penstocks, and other mechanical components required in dams and reservoirs. These components are crucial for regulating the flow of water, controlling the water level, and managing the release of water from the reservoir. Steel billets are forged, rolled, or machined to create these specialized components, ensuring their strength, reliability, and resistance to corrosion. Furthermore, steel billets are used in the construction of spillways, which are designed to safely discharge excess water from reservoirs during periods of heavy rainfall or flood. The spillway gates, channels, and other structures are often made from steel billets, as they need to withstand high water pressure and turbulent flow conditions. In summary, steel billets are indispensable in the construction of dams and reservoirs. They are used to produce reinforced concrete, providing structural support and increasing the overall strength of the structure. Steel billets are also employed in the manufacturing of gates, penstocks, spillways, and other mechanical components, guaranteeing the efficient operation and long-term durability of these essential water management infrastructure.
- Q:How do steel billets contribute to the construction of bridges and infrastructure?
- Steel billets play a crucial role in the construction of bridges and infrastructure due to their strength, versatility, and durability. These cylindrical bars of steel are produced through a process called casting, where molten steel is poured into molds and allowed to cool and solidify. One of the primary contributions of steel billets to bridge construction is their high load-bearing capacity. Bridges are subjected to heavy loads, such as the weight of vehicles, pedestrians, and even natural forces like wind and earthquakes. Steel billets, with their exceptional strength and structural integrity, provide the necessary support to withstand these loads and ensure the safety and stability of the bridge. Furthermore, steel billets offer flexibility in design and construction. Their malleability allows them to be easily shaped and formed into various structural components, such as beams, columns, and girders, which are essential elements in bridge construction. This flexibility enables engineers to create innovative designs and optimize the use of materials, resulting in cost-effective and efficient bridge structures. Another significant advantage of steel billets is their resistance to corrosion. Bridges are constantly exposed to harsh environmental conditions, including moisture, saltwater, and pollution. Steel billets can be treated with protective coatings or alloyed with elements such as chromium or nickel to enhance their resistance to corrosion. This ensures the longevity and durability of the bridge, reducing maintenance costs and enhancing its lifespan. Additionally, steel billets contribute to the speed of bridge construction. As these billets are prefabricated in steel mills, they can be produced in large quantities and transported to the construction site, ready for assembly. This prefabrication process reduces the time required for on-site construction, minimizing disruption to traffic and reducing overall project duration. In summary, steel billets are integral to the construction of bridges and infrastructure due to their high load-bearing capacity, flexibility in design and construction, resistance to corrosion, and contribution to faster construction times. Their contribution ensures the safety, longevity, and efficiency of bridge structures, making them an essential component in the development of robust and reliable infrastructure systems.
- Q:What are the different types of defects found in steel billets?
- There are several types of defects that can be commonly found in steel billets. These defects can occur during the manufacturing process or due to external factors. Some of the different types of defects found in steel billets include: 1. Surface defects: These defects are visible on the surface of the billet and can include scale, scratches, cracks, or pits. Surface defects can be caused by improper handling, inadequate cleaning, or excessive heat during the manufacturing process. 2. Internal defects: These defects are not visible on the surface and can only be detected through non-destructive testing methods. Internal defects can include voids, inclusions, segregation, or non-uniform microstructures. These defects can affect the mechanical properties and overall quality of the steel billet. 3. Decarburization: This defect occurs when the surface layer of the billet loses its carbon content due to exposure to high temperatures or oxygen. Decarburization can weaken the billet and reduce its strength and hardness. 4. Shrinkage cavities: Shrinkage cavities are formed when the steel billet solidifies and contracts unevenly. These cavities can lead to reduced mechanical properties and structural integrity. 5. Surface cracks: Cracks can occur during the cooling and solidification process of the billet due to thermal stresses. These cracks can propagate into the interior of the billet, leading to further defects and potential failure. 6. Segregation: Segregation refers to the uneven distribution of elements or impurities within the steel billet. This can result in inconsistent mechanical properties, reduced strength, and poor machinability. 7. Inclusions: Inclusions are foreign particles or impurities that are trapped within the steel billet during the manufacturing process. These inclusions can affect the mechanical properties and can cause defects such as porosity or brittleness. It is essential to minimize and control these defects in steel billets to ensure high-quality finished products. Proper quality control measures, material handling, and manufacturing processes can help reduce the occurrence of these defects and improve the overall quality of steel billets.
- Q:How are steel billets reheated before rolling or forging?
- Steel billets are reheated before rolling or forging through a process known as billet heating. This process involves subjecting the billets to high temperatures to make them more malleable and easier to shape. There are several methods commonly used for billet heating, including: 1. Furnaces: The most common method of reheating steel billets is through the use of furnaces. These furnaces are typically gas-fired and can reach temperatures of up to 1,200 degrees Celsius. The billets are loaded into the furnace and heated for a specific period of time to achieve the desired temperature. The furnace provides a controlled environment, allowing for even heating and uniformity. 2. Induction heating: Another method used for reheating steel billets is induction heating. This process utilizes electromagnetic induction to heat the billets. An alternating current is passed through a copper coil, creating a magnetic field. The billets are then placed inside the coil, and the magnetic field induces eddy currents within the billets, generating heat. Induction heating offers precise temperature control and rapid heating rates, making it suitable for high-speed production. 3. Electric resistance heating: Electric resistance heating is another technique employed for reheating steel billets. This method involves passing an electric current through the billets, causing them to heat up due to the resistance encountered. Electric resistance heating can be achieved using various types of heating elements, such as graphite electrodes or resistance heating wires. This method offers precise temperature control and is commonly used for smaller-scale operations. Regardless of the heating method used, it is essential to carefully control the temperature and heating time to ensure the billets reach the optimal temperature for rolling or forging. The reheating process allows the steel to become more pliable, reducing its hardness and increasing its ductility, making it easier to shape and form into the desired end product.
- Q:How are steel billets inspected for hardness?
- Various methods and techniques are used to inspect the hardness of steel billets. Among these methods, the Rockwell hardness test is commonly employed. This test measures the depth of penetration of an indenter into the steel surface under a specific load to determine the hardness value. It is a quick and reliable way to assess the hardness of steel billets. Another method used for hardness inspection is the Brinell hardness test. This test involves applying a specific load on a hardened steel ball and measuring the diameter of the resulting indentation on the steel surface. The hardness value is calculated based on the applied load and the diameter of the indentation. The Brinell hardness test is useful for large steel billets or when a larger area needs to be tested. Additionally, the Vickers hardness test can be employed to inspect the hardness of steel billets. This method uses a diamond pyramid-shaped indenter to create an impression on the steel surface. The diagonals of the impression are measured, and the hardness value is determined based on the applied load and the surface area of the impression. The Vickers hardness test is commonly used for materials with high hardness or small components. In addition to these traditional hardness testing methods, advanced techniques such as ultrasonic testing and magnetic induction are also available. Ultrasonic testing involves sending high-frequency sound waves through the steel billet and measuring the time it takes for the waves to be reflected back. Any variations in the hardness of the billet can be detected through changes in the ultrasonic waves. On the other hand, magnetic induction utilizes magnetic fields to assess the hardness of steel. By measuring the electrical conductivity and permeability of the steel billet, the hardness can be estimated. Overall, there are several techniques available for inspecting the hardness of steel billets, including Rockwell, Brinell, and Vickers hardness tests, as well as ultrasonic testing and magnetic induction. These methods provide valuable information about the hardness properties of the billets, enabling manufacturers to ensure the quality and suitability of the steel for various applications.
- Q:What are the different surface defects that can be found in steel billets?
- Some common surface defects that can be found in steel billets include cracks, scale, pits, inclusions, and surface roughness.
- Q:What are the common defects in steel billets during hot rolling?
- During hot rolling, steel billets may experience certain defects that can affect the quality of the final product. Some common defects include: 1. Surface cracks: These are longitudinal cracks that occur on the surface of the billet. They can be caused by improper cooling, high rolling temperatures, or poor quality of the steel. Surface cracks can lead to weakened structural integrity and reduced product performance. 2. Internal cracks: These are cracks that occur within the billet, away from the surface. Internal cracks can be caused by inadequate billet heating, uneven temperature distribution, or improper rolling parameters. They can result in material failure or dimensional inconsistencies in the final product. 3. Surface defects: These can include scales, pits, or scars on the surface of the billet. They are often caused by poor billet preparation, inadequate scale removal, or improper rolling practices. Surface defects can affect the appearance and surface quality of the final product. 4. Lamination: Lamination defects occur when there are layers or planes of separation within the billet. They can be caused by impurities in the steel, improper billet preparation, or inadequate rolling parameters. Laminations can lead to reduced mechanical properties and structural integrity of the final product. 5. Warping: Warping defects occur when the billet undergoes uneven cooling or excessive rolling tensions. This can result in distortion or bending of the billet, leading to dimensional inconsistencies in the final product. 6. Inclusions: Inclusions are non-metallic particles or impurities that are trapped within the steel during the billet formation process. They can result in reduced mechanical properties, surface defects, or material failure in the final product. To minimize these defects, proper control of rolling parameters, billet preparation, and cooling processes is essential. Regular inspections and quality control measures should be implemented to identify and address any defects that may arise during hot rolling.
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Hot Rolled Square Bar with High Quality of Grade Q235，Q275
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT or LC
- Min Order Qty:
- 3000 m.t.
- Supply Capability:
- 100000 m.t./month
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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