Carbon Structural Steel Round Bars ST37-2CR
- Ref Price:
-
- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25 m.t.
- Supply Capability:
- 120000 m.t./month
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Carbon Structural Steel Round Bars ST37-2CR
Product Specification
1, Chemical Composition %
| Grade | C | Si | Mn | S | P | Cr |
| ST37-2CR | 0.21-0.25 | ≤0.35 | ≤1.4 | ≤0.045 | ≤0.045 | ≥0.30 |
2, Mechanical Properties
| Strength of Extension σb | Yield Strength σs | Impact AKv |
| 340-470 Mpa | ≥235 Mpa | ≥27J |
3, Diameter: 9mm - 80mm
Application
1, Widely used in construction and engineering structure.
2, Widely used in making reinforcing steel bar or building plant room rack, high voltage transmission tower, bridge, vehicle, boiler, vessel, ship, etc.
3, Widely used in manufacturing mechanical parts which are not required to be with high performance.
Product Main Points
1, Heat Treatment: normalizing, annealing, tempering, quenching
2, Surface Treatment: black, grinding, bright, polish
3, Product Process: hot rolled, cold drawn, forged
FAQ
1, Payment Terms:
30% T/T deposit & 70% T/T before delivery.
Irrevocable L/C at sight
2, Trade Terms:
EXW, FOB, CIF, CNF
3, Delivery Time:
Normally 30-40 days. According to quantity.
4, Manufacture or Trading Company:
CNBM is a state-owned fortune global 500 trading company. We have intergrated supply system.
There are about 20 overseas locations in different countries.
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About Us
- Q:Can steel round bars be hardened?
- Yes, steel round bars can be hardened. Hardening is a process in which the steel is heated to a specific temperature and then rapidly cooled, commonly known as quenching. This rapid cooling causes the steel to undergo a transformation, resulting in increased hardness and strength. The hardening process is typically followed by tempering, which involves reheating the hardened steel to a lower temperature to reduce its brittleness and further enhance its toughness. Hardening is commonly used in the manufacturing of tools, machine parts, and other applications where high strength and durability are required.
- Q:What are the different types of finishes available for steel round bars?
- Steel round bars offer a variety of finishes, each with its own unique properties and appearance. 1. Mill Finish: The most commonly used finish is the mill finish, where the steel is left in its natural state after rolling and cooling. This results in a rough texture and the possibility of surface imperfections. 2. Hot Rolled Finish: Achieved by heating the steel to high temperatures and shaping it through rolling. This finish provides a smooth surface and is typically used in applications where aesthetics are not a priority. 3. Cold Drawn Finish: Involves pulling the steel through a die to reduce its diameter and increase its length. This finish offers a smooth surface, improved dimensional accuracy, and tighter tolerances. 4. Polished Finish: Steel round bars can be polished to achieve a smooth and reflective surface. This is done using abrasive materials or compounds to remove imperfections and enhance appearance. 5. Ground Finish: A process that involves removing a thin layer of material from the steel surface using abrasive grinding wheels. This creates a smooth and even finish suitable for applications that require precise dimensions and tight tolerances. 6. Coated Finish: Steel round bars can be coated with different materials for added protection against corrosion or to enhance appearance. Common coatings include galvanization, which applies a layer of zinc, and powder coating, which provides durability and a decorative finish. When choosing a finish for a steel round bar, it is important to consider the specific application and desired properties. Factors such as corrosion resistance, aesthetics, dimensional accuracy, and surface quality should be taken into account.
- Q:Are steel round bars prone to deformation?
- Yes, steel round bars can be prone to deformation under certain conditions. Factors such as excessive heat, extreme pressure, or improper handling can cause steel round bars to bend, warp, or twist. However, when manufactured and used properly, steel round bars are highly durable and resistant to deformation.
- Q:What are the advantages of using chromium-vanadium alloy steel round bars?
- Some advantages of using chromium-vanadium alloy steel round bars include: 1. High strength and toughness: Chromium-vanadium alloy steel has excellent strength and toughness properties, making it suitable for applications requiring durability and resistance to wear and tear. 2. Improved corrosion resistance: The addition of chromium enhances the alloy's corrosion resistance, making it resistant to rust and other forms of corrosion, even in harsh environments. 3. Enhanced hardenability: Chromium-vanadium alloy steel can be easily heat-treated to achieve high hardness levels, allowing for increased wear resistance and improved overall performance. 4. Good machinability: The alloy steel round bars can be easily machined and fabricated, making them convenient to work with in various manufacturing processes. 5. Cost-effective: Chromium-vanadium alloy steel offers a good balance between performance and cost, making it a cost-effective choice for many applications compared to other high-performance alloys.
- Q:How are steel round bars used in the manufacturing of hydraulic cylinders?
- Steel round bars are a crucial component in the manufacturing of hydraulic cylinders due to their strength, durability, and versatility. These round bars are typically made from carbon steel, alloy steel, or stainless steel, which are all known for their high tensile strength and resistance to corrosion. The first step in using steel round bars for hydraulic cylinders is the selection of the appropriate diameter and length. The diameter of the round bar determines the overall strength of the hydraulic cylinder, and the length determines its size and capacity. Once the desired dimensions are determined, the steel round bars are cut to the required length using specialized cutting tools. Next, the steel round bars undergo a series of processes to shape them into the necessary components of a hydraulic cylinder. This includes machining, drilling, and turning operations to create features such as threaded ends, grooves, and mounting surfaces. These processes are carried out with precision to ensure the round bars meet the exact specifications of the hydraulic cylinder design. After the shaping processes, the steel round bars are heat-treated to enhance their mechanical properties. Heat treatment involves heating the round bars to a specific temperature and then rapidly cooling them to achieve the desired hardness, toughness, and dimensional stability. This step is crucial in ensuring the hydraulic cylinders can withstand the high pressures and forces they will encounter during operation. Once the steel round bars have been shaped and heat-treated, they are further processed to achieve the desired surface finish. This can involve processes such as grinding, polishing, or coating to improve the round bars' appearance and resistance to corrosion. The surface finish is important for ensuring smooth operation and preventing any potential leaks or damage to the hydraulic cylinder. Finally, the steel round bars are assembled with other components such as piston rods, cylinder heads, and seals to complete the hydraulic cylinder. These assemblies are carried out using advanced welding or fastening techniques to ensure the components are securely attached and can withstand the forces and pressures exerted during hydraulic operation. In summary, steel round bars play a vital role in the manufacturing of hydraulic cylinders by providing the necessary strength, durability, and versatility required for these critical components. From the initial selection of the appropriate diameter and length to the shaping, heat treatment, and assembly processes, the use of steel round bars ensures the hydraulic cylinders can effectively transmit hydraulic power while withstanding the demanding conditions they are designed for.
- Q:What are the advantages of using niobium-alloy steel round bars?
- There are several advantages to using niobium-alloy steel round bars. Firstly, niobium-alloy steel has excellent strength and toughness properties. The addition of niobium to the steel increases its strength while maintaining its ductility, making it ideal for applications that require high strength and durability. This allows niobium-alloy steel round bars to withstand heavy loads and shocks without deforming or breaking easily. Secondly, niobium-alloy steel has a high resistance to corrosion. This makes it suitable for use in harsh environments where exposure to moisture, chemicals, or corrosive substances is common. The corrosion resistance of niobium-alloy steel ensures that the round bars will remain intact and retain their structural integrity over time, reducing the need for frequent replacements and maintenance. Additionally, niobium-alloy steel has excellent weldability and formability. It can be easily welded and fabricated into various shapes and sizes, making it adaptable to different manufacturing processes and applications. This versatility allows for the production of custom-designed round bars that meet specific project requirements. Moreover, niobium-alloy steel has good heat resistance properties. It can withstand high temperatures without losing its strength or undergoing significant changes in its mechanical properties. This makes it suitable for applications that involve exposure to extreme heat or thermal cycling, such as in the aerospace or automotive industries. Furthermore, niobium-alloy steel is known for its excellent fatigue resistance. It has a high endurance limit, which means it can withstand repeated loading and unloading cycles without experiencing fatigue failure. This makes niobium-alloy steel round bars ideal for applications that involve dynamic or cyclic loading, such as in structural components or machinery. In conclusion, the advantages of using niobium-alloy steel round bars include high strength, corrosion resistance, weldability, formability, heat resistance, and fatigue resistance. These properties make niobium-alloy steel a reliable and cost-effective choice for various industries and applications.
- Q:Can steel round bars be heat treated to enhance their properties?
- Yes, steel round bars can be heat treated to enhance their properties. Heat treatment processes such as quenching, tempering, and annealing can be applied to steel round bars to increase their hardness, strength, and toughness. These treatments can also improve other properties like wear resistance and machinability, making the steel bars more suitable for specific applications.
- Q:What are the different types of heat treatments used for steel round bars?
- There are several different types of heat treatments that are commonly used for steel round bars. These treatments are designed to alter the physical and mechanical properties of the steel, making it more suitable for specific applications. 1. Annealing: This heat treatment involves heating the steel to a high temperature and then slowly cooling it, usually in a furnace. Annealing relieves internal stresses and improves the steel's ductility, making it easier to work with and less prone to cracking. 2. Normalizing: Similar to annealing, normalizing also involves heating the steel to a high temperature and then cooling it, but the cooling process is done in still air. Normalizing refines the steel's grain structure, making it more uniform and improving its strength and toughness. 3. Quenching and tempering: This heat treatment involves heating the steel to a high temperature and then rapidly cooling it by quenching it in a liquid, such as oil or water. This process hardens the steel, making it stronger and more resistant to wear and deformation. However, quenching can also make the steel brittle, so it is often followed by tempering, which involves reheating the steel to a lower temperature and then slowly cooling it. Tempering reduces the brittleness and improves the steel's toughness, while still maintaining a high level of strength. 4. Case hardening: This heat treatment is used to create a hard outer layer, or case, on the surface of the steel, while maintaining a softer and more ductile core. The steel is heated in the presence of a carbon-rich material, such as charcoal or gas, which diffuses carbon into the surface of the steel. This generates a hardened layer that is resistant to wear, while the core remains tough and shock-resistant. 5. Stress relieving: This heat treatment is used to reduce internal stresses that may have been generated during manufacturing processes, such as machining or welding. The steel is heated to a temperature below its critical point and then slowly cooled, which helps to relieve the residual stresses and improve the dimensional stability of the steel. These are just a few of the most common types of heat treatments used for steel round bars. The specific heat treatment chosen will depend on the desired properties and the intended application of the steel.
- Q:What are the typical tolerances for steel round bars?
- The specific requirements of the application or industry can cause variations in the typical tolerances for steel round bars. However, common standard tolerances are generally accepted. Regarding diameter, the tolerances for steel round bars typically fall within a few thousandths of an inch. This means that the actual diameter of the bar may slightly deviate from the specified diameter, but it will still be within an acceptable range. In terms of straightness, steel round bars are commonly manufactured with a tolerance for some deviation from a perfectly straight line. The usual tolerance for straightness is measured in units of inches per foot or millimeters per meter. This means that the bar may have a slight bend or curve, but it should not exceed the specified tolerance. Surface finish is another important factor for steel round bars. The tolerance for surface finish is usually specified in terms of roughness average (Ra) or surface roughness in micrometers. This tolerance ensures that the bar's surface is smooth and free from significant imperfections, such as pits or scratches. It is important to note that these typical tolerances can vary depending on the specific grade or type of steel used, as well as the intended application. Precision or critical applications may require tighter tolerances, while less demanding applications may accept looser tolerances. Therefore, it is recommended to consult relevant industry standards or specifications to determine the specific tolerances required for a particular steel round bar.
- Q:Can steel round bars be extruded?
- Steel round bars cannot be extruded; instead, they are typically produced through a different process called hot rolling. In hot rolling, a cylindrical billet is heated and passed through a series of rollers to achieve the desired diameter and length. Extrusion, on the other hand, is a manufacturing process that involves forcing material through a die to create specific shapes or profiles. While steel can be extruded into various shapes such as tubes, channels, or angles, round bars are not typically produced in this way.
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Carbon Structural Steel Round Bars ST37-2CR
- Ref Price:
-
- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25 m.t.
- Supply Capability:
- 120000 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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