Hot rolled, forged, QT heat treatment and normalizing
6. Payment term
T/T, L/C or we can negotiate.
7. Delivery time
20days after the order confirmed
8. Characteristics
1) The strength and hardness of S20C/ 1020/ 20 is higher than that of S15C/ 1015/ 15.
2) Good plasticity and weldability.
3) Good toughness after hot rolling and normalization.
9. Application
S20C structural carbon steel bar /1020 /20 can be used to be manufactured medium or small carburization or nitrocarburizing parts and press forging parts, such as lever shaft, selector fork of speed changing box, gear, heavy mechanical lever and shackle, etc.
Products Show
Product Overviews
Product Name
Typical Grades
Diameter(mm)
Standard adopted
Carbon Steel
20 (1020/S20C/C22)
Ø16-Ø300
GB/SAE/JIS/DIN
40 (1040/S40C/C40)
45 (1045/S45C/C45)
Bearing Steel
GCr9 (51100/SUJ1)
Ø12-Ø250
GCr15 (52100/SUJ2/100Gr6)
GCr9SiMn (A485-Gr.1/SUJ3)
Cr-Mo Steel
20Cr (5120/SCr420H/20Cr4)
Ø12-Ø250
40Cr (5140/SCr440/41Cr4)
42CrMo(4140/SCM440/42CrMo4)
Gear Steel
20CrNiMo
Ø16-Ø600
20CrMn(5115/SMnC420/20MnCr5)
20CrNiMo(8620/SNCM220/20CrMiMo2)
Application
Carbon Steel
Mold bottom, Plastic mold, Construction machinery parts
Automobile parts, Security grills, Screens, Construction
Bearing Steel
Aerospace, Navigation, Nuclear energy, Chemical industry
Electronic information, Petrochemical, Instrument and meter
Transportation
Cr-Mo Steel
Mechanism & Fasteners gear, Stressed components for vehicles
Q:What are the different grades of steel used in round bars?
There are various grades of steel used in round bars, each with its own unique properties and applications. Some commonly used grades include:
1. Mild Steel (Grade 1018): This is a low carbon steel with good machinability and weldability. It is often used in general engineering applications, such as construction, automotive, and machinery.
2. Carbon Steel (Grade 1045): Carbon steel is a medium carbon steel with high tensile strength and good wear resistance. It is commonly used in shafts, axles, gears, and other high-stress applications.
3. Alloy Steel (Grades 4140, 4340): Alloy steels contain additional elements such as chromium, molybdenum, or nickel to enhance their mechanical properties. These grades offer excellent strength, toughness, and wear resistance and are often used in applications that require high strength and durability, such as automotive parts, aircraft components, and industrial machinery.
4. Stainless Steel (Grades 304, 316): Stainless steel is a corrosion-resistant steel that contains a minimum of 10.5% chromium. It is widely used in various industries, including food processing, chemical, and medical, due to its excellent corrosion resistance, heat resistance, and aesthetic appeal.
5. Tool Steel (Grades A2, D2): Tool steels are specifically designed to have high hardness, wear resistance, and toughness. They are commonly used in the manufacturing of cutting tools, dies, and molds.
These are just a few examples of the different grades of steel used in round bars. The selection of the appropriate grade depends on the specific application requirements, including strength, corrosion resistance, heat resistance, and machinability.
Q:What are the advantages of using nickel-chromium-manganese alloy steel round bars?
There are several advantages of using nickel-chromium-manganese alloy steel round bars in various applications.
Firstly, this type of alloy steel offers excellent strength and durability. The combination of nickel, chromium, and manganese enhances the overall strength of the steel, making it resistant to wear, impact, and deformation. This is particularly beneficial in industries such as construction, manufacturing, and automotive, where the round bars are commonly used for structural support and load-bearing purposes.
Secondly, nickel-chromium-manganese alloy steel round bars exhibit excellent corrosion resistance. The presence of nickel and chromium in the alloy composition makes it highly resistant to rust and oxidation, even in harsh environments or exposure to corrosive substances. This property is crucial in applications where the round bars are exposed to moisture, chemicals, or high temperatures, such as marine environments or chemical processing plants.
Additionally, this type of alloy steel offers good weldability and machinability. The combination of nickel, chromium, and manganese provides a balanced composition that allows for easy welding and machining operations. This makes it convenient for fabricators and manufacturers to work with the round bars, enabling them to create complex shapes or structures without compromising the material's integrity.
Moreover, nickel-chromium-manganese alloy steel round bars have excellent heat resistance. The presence of nickel and chromium in the alloy composition enhances its ability to withstand high temperatures without losing its strength or shape. This property makes it suitable for applications that involve exposure to extreme heat, such as furnace components, heat exchangers, or high-temperature industrial processes.
Lastly, the use of nickel-chromium-manganese alloy steel round bars often leads to cost savings in the long run. Due to their exceptional strength and durability, these round bars have a longer lifespan compared to other materials. This reduces the need for frequent replacements, resulting in lower maintenance costs and improved overall efficiency.
In conclusion, the advantages of using nickel-chromium-manganese alloy steel round bars include excellent strength and durability, corrosion resistance, weldability, machinability, heat resistance, and long-term cost savings. These properties make them a preferred choice in various industries where high-performance materials are required.
Q:Can steel round bars be machined easily?
Yes, steel round bars can be machined easily due to their excellent machinability properties.
Q:What are the different types of surface defects in steel round bars?
There are several different types of surface defects that can occur in steel round bars. These defects can vary in severity and can impact the quality and performance of the bars. Some of the common types of surface defects in steel round bars include:
1. Scale: Scale is a type of oxide layer that forms on the surface of steel during the manufacturing process. It can appear as a rough, flaky layer on the surface of the bar. Scale can negatively affect the appearance and surface finish of the bar.
2. Pits: Pits are small depressions or cavities that can occur on the surface of the bar. They can be caused by various factors such as corrosion, mechanical damage, or manufacturing defects. Pits can weaken the structural integrity of the bar and make it more susceptible to failure.
3. Scratches: Scratches are shallow grooves or marks on the surface of the bar. They can be caused by handling, transportation, or contact with other objects during the manufacturing process. While scratches may not significantly impact the strength of the bar, they can affect its appearance and surface finish.
4. Cracks: Cracks are linear fractures that can occur on the surface of the bar. They can be caused by excessive stress, thermal cycling, or manufacturing defects. Cracks can be extremely detrimental to the strength and integrity of the bar and can lead to catastrophic failure if left untreated.
5. Decarburization: Decarburization refers to the loss of carbon from the surface layer of the steel bar. It can occur during the heating or cooling processes and can result in a softer and weaker surface layer. Decarburization can reduce the overall strength and durability of the bar.
6. Lamination: Lamination refers to the separation or delamination of layers within the steel bar. It can occur during the manufacturing process due to improper bonding or rolling conditions. Lamination can weaken the structural integrity of the bar and make it more prone to failure.
7. Inclusions: Inclusions are non-metallic particles or impurities that can be present on the surface of the bar. They can be caused by contaminants in the raw materials or improper manufacturing processes. Inclusions can negatively impact the mechanical properties and performance of the bar.
It is important to identify and address these surface defects in steel round bars to ensure their quality and performance. Various inspection and testing methods can be employed to detect and mitigate these defects, such as visual inspection, ultrasonic testing, magnetic particle inspection, and dye penetrant inspection.
Q:Can steel round bars be used for making gears or sprockets?
Gears or sprockets can indeed be made using steel round bars. Steel is widely employed in the manufacturing of gears and sprockets due to its exceptional strength, durability, and resistance to wear and tear. Steel round bars can be shaped through machining or forging and then further modified by cutting, drilling, or milling to create the necessary teeth or grooves for gear or sprocket functionality. The selection of the specific type of steel and its heat treatment can be based on the application requirements, such as load capacity, speed, and environmental conditions. All in all, steel round bars offer a versatile and dependable option for the production of gears and sprockets.
Q:Can steel round bars be used in the food processing industry?
Steel round bars can indeed be utilized in the food processing sector. Steel is widely applied across various industries owing to its robustness, longevity, and ability to resist corrosion. In the realm of food processing, steel round bars find frequent application in equipment like food mixers, conveyors, and cutting tools. These bars are typically crafted from stainless steel, a specific steel variant enriched with chromium and other elements to enhance its resistance against corrosion and staining. Remarkably, stainless steel is non-reactive and does not introduce any flavors or odors into the processed food. Additionally, it is effortless to clean and maintain, rendering it highly suitable for deployment in food processing facilities where hygiene is paramount. However, it is crucial to ensure that the steel round bars employed in the food processing industry adhere to the necessary standards and regulations to guarantee the safety of the processed food.
Q:What are the weight calculations for steel round bars?
One can determine the weight of steel round bars through a simple formula. To calculate the weight of a steel round bar, multiply the square of its diameter in millimeters by the length in meters, and then multiply the result by the specific weight of steel, which is typically around 7.85 grams per cubic centimeter.
The weight of a steel round bar can be calculated using the following formula:
Weight = (Diameter^2 x Length x Specific Weight of Steel) / 1000
In this formula:
- Diameter represents the diameter of the round bar in millimeters.
- Length indicates the length of the round bar in meters.
- Specific Weight of Steel refers to the density of steel, usually 7.85 grams per cubic centimeter.
- 1000 is employed to convert the weight from grams to kilograms.
It is essential to consider that this formula assumes the round bar is made solely of steel and does not take into account any variations in the specific weight among different steel alloys. Moreover, it is crucial to maintain consistent units throughout the calculation, whether millimeters or meters, for accurate results.
Q:What is the difference between hot working and cold working of steel round bars?
Steel round bars can be shaped and manipulated using two different methods: hot working and cold working.
Hot working involves shaping steel at high temperatures, typically above the steel's recrystallization temperature. This makes the material more malleable and easier to shape. The processes involved in hot working include forging, rolling, and extrusion.
Hot working has several advantages. It allows for the creation of complex shapes and sizes with minimal force or energy. It also improves the mechanical properties of the steel, such as strength and toughness, by refining its grain structure. However, hot working can cause oxidation and scale formation on the steel's surface, which may require additional treatments or cleaning.
On the other hand, cold working refers to shaping steel at room temperature or below its recrystallization temperature. Cold working processes include bending, drawing, and cold rolling.
Unlike hot working, cold working does not require heating the steel, which reduces energy consumption and production costs. It also results in a smoother surface finish and tighter tolerances compared to hot working. Cold working can increase the hardness and strength of the steel, making it suitable for applications that require higher mechanical properties. However, it can also make the steel more brittle and prone to cracking.
In conclusion, the main difference between hot working and cold working steel round bars lies in the temperature at which the shaping process takes place. Hot working is done at high temperatures, making shaping easier and improving mechanical properties. Cold working, on the other hand, is done at room temperature or below, resulting in tighter tolerances and increased hardness. The choice between hot working and cold working depends on the desired properties and characteristics of the final product.
Q:What are the different types of steel round bar surface finishes used in the aerospace industry?
In the aerospace industry, there are several types of steel round bar surface finishes commonly used. These include:
1. Smooth Finish: This is a standard surface finish that is achieved through machining or grinding processes. It provides a smooth and polished surface, ensuring minimal friction and wear.
2. Brushed Finish: This finish is achieved by brushing the steel round bar with a fine abrasive material. It creates a distinctive linear pattern on the surface, enhancing its aesthetic appeal while maintaining a smooth texture.
3. Shot Blasted Finish: In this process, steel round bars are bombarded with small steel shots at high velocity. This results in a textured and slightly rough surface, which improves grip and provides better adhesion for coatings or paints.
4. Peened Finish: Peening involves impacting the surface of the steel round bar with small metal pellets or balls. This creates a dimpled texture, enhancing the material's resistance to fatigue and improving its strength and durability.
5. Anodized Finish: This is a surface treatment commonly used on aluminum alloys in the aerospace industry. However, it can also be applied to steel round bars. Anodization creates a thin, protective oxide layer on the surface, enhancing corrosion resistance and improving the material's appearance.
These different types of surface finishes are chosen based on the specific requirements of the aerospace industry, considering factors such as durability, corrosion resistance, aesthetics, and functionality.
Q:How do steel round bars compare to aluminum round bars?
Steel round bars are generally stronger and more durable than aluminum round bars. They have a higher tensile strength, making them suitable for heavy-duty applications that require high levels of strength and resistance to bending or deformation. Aluminum round bars, on the other hand, are lighter and more corrosion-resistant, making them ideal for applications that prioritize weight reduction and resistance to exposure to harsh environments. The choice between steel and aluminum round bars ultimately depends on the specific requirements of the application.
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