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: Can steel round bars be used in the manufacturing of marine propellers?
Yes, steel round bars can be used in the manufacturing of marine propellers. Steel is a commonly used material for propellers due to its high strength, durability, and resistance to corrosion in marine environments. By using steel round bars, manufacturers can easily shape and form the propeller blades, ensuring optimal performance and longevity in marine applications.
Q: What is the difference between a polished and a hot rolled steel round bar?
The manufacturing processes and resulting surface finishes distinguish polished steel round bars from hot rolled ones.
To produce hot rolled steel round bars, a steel billet or ingot is heated to high temperatures and then shaped into a round bar through rolling. This method yields a surface finish that is rough and uneven, with mill scale and imperfections. Hot rolled bars are typically utilized in applications where surface finish is not crucial, such as structural components, machinery parts, and construction materials.
In contrast, polished steel round bars undergo additional steps to achieve a smooth and glossy surface finish. Following the hot rolling process, these bars undergo various grinding and polishing techniques to eliminate mill scale, surface imperfections, and achieve a consistent finish. The result is a refined and visually appealing surface, suitable for applications where appearance matters, such as decorative items, furniture, and architectural components.
Aside from surface finish, the mechanical properties of the two types of steel round bars can also differ. Hot rolled bars tend to possess a rougher surface and may exhibit residual stresses, while polished bars feature a smoother surface and reduced internal stresses. However, the overall mechanical properties, including strength and hardness, are predominantly determined by the grade and composition of the steel used, rather than the manufacturing process or surface finish.
In conclusion, the discrepancy between polished and hot rolled steel round bars lies in their surface finish. Hot rolled bars have a rough and uneven surface with mill scale and imperfections, while polished bars undergo further processing for a smooth and glossy finish. The choice between the two depends on the specific application and desired appearance of the final product.
Q: What are the advantages of using carbon steel round bars?
The advantages of using carbon steel round bars include high strength and durability, excellent machinability, and cost-effectiveness. Carbon steel round bars are known for their superior tensile strength, making them suitable for heavy-duty applications. They are also highly resistant to wear and tear, ensuring long-lasting performance. Additionally, carbon steel round bars can be easily shaped and formed, making them ideal for machining processes. Lastly, carbon steel round bars are relatively affordable compared to other materials, providing a cost-effective solution for various industries.
Q: Can steel round bars be used for making drill bits?
No, steel round bars cannot be directly used for making drill bits. Drill bits require specific materials and manufacturing processes to ensure the necessary hardness, sharpness, and durability.
Q: Can steel round bars be used for making cutting tools?
Yes, steel round bars can be used for making cutting tools. Steel is a versatile material that can be hardened and tempered to create sharp and durable cutting edges. Round bars can be machined and shaped into various cutting tool profiles such as drills, lathe tools, milling cutters, and punches. The specific type of steel used will depend on the desired cutting application, as different steel alloys have different properties such as hardness, toughness, and wear resistance. Heat treatment processes like quenching and tempering can further enhance the cutting performance and longevity of the tools. Overall, steel round bars provide a reliable and cost-effective option for manufacturing cutting tools.
Q: What is the difference between a smooth and a deformed steel round bar?
A smooth steel round bar is characterized by its consistently even surface, free from any visible imperfections or deformities. It is typically produced using the hot rolling technique, which involves heating a steel billet and passing it through a series of rolling mills to achieve the desired shape and surface finish. Smooth steel round bars are commonly employed in applications where aesthetics and surface quality are of utmost importance, such as architectural designs or decorative metalwork.
Contrarily, a deformed steel round bar possesses intentional deformations or patterns on its surface. These deformations can take various forms, including ridges, ribs, or indentations. The purpose of incorporating deformations on the surface of a steel round bar is to enhance its ability to bond with concrete or other materials. The irregular surface of a deformed bar provides increased friction and better adhesion, thereby improving the structural integrity of reinforced concrete structures.
Deformed steel round bars find primary use in construction projects, particularly in reinforced concrete structures like columns, beams, and slabs. The deformations on the bar's surface serve to prevent slippage between the steel and concrete, ensuring a stronger bond and enhancing the overall stability and durability of the structure.
To summarize, the key distinction between a smooth and a deformed steel round bar lies in their surface characteristics and intended applications. Smooth bars possess a uniform and smooth surface, making them suitable for applications that prioritize aesthetics and surface quality. Deformed bars, on the other hand, possess intentional deformations to enhance bonding with concrete, making them well-suited for construction projects that require reinforced concrete structures.
Q: Can steel round bars be used in the aerospace manufacturing industry?
Yes, steel round bars can be used in the aerospace manufacturing industry. Steel round bars are commonly used in various aerospace applications such as structural components, landing gear, engine components, and fasteners. The high strength and durability of steel make it suitable for these critical aerospace applications. Additionally, steel round bars can be easily machined and formed into complex shapes, allowing for customization and precise engineering requirements in the aerospace industry. Furthermore, steel's resistance to corrosion and its ability to withstand extreme temperatures make it a reliable choice for aerospace manufacturing. Overall, steel round bars are a versatile and widely used material in the aerospace industry due to their strength, durability, machinability, and resistance to corrosion.
Q: What are the different cutting methods used for steel round bars?
The cutting of steel round bars can be done using various methods, depending on the specific requirements and available tools. Here are some commonly used cutting methods:
1. Sawing: Traditional sawing using a saw blade is a cost-effective and simple method suitable for smaller diameter round bars.
2. Abrasive Cutting: When cutting thicker and harder steel bars, abrasive cutting with an abrasive wheel or disc proves to be highly effective. It is often used in industrial applications where precision and speed are crucial.
3. Plasma Cutting: This thermal cutting method involves using a high-velocity jet of ionized gas to melt and remove the metal. It is suitable for cutting steel bars of different thicknesses and is renowned for its speed and precision.
4. Laser Cutting: Laser cutting is an efficient and precise method that utilizes a high-powered laser beam to melt and vaporize the metal. It is commonly employed for cutting intricate shapes and patterns in steel round bars.
5. Waterjet Cutting: Waterjet cutting utilizes a high-pressure stream of water mixed with an abrasive material to cut through steel bars of varying thicknesses and types. It is a versatile method.
6. Shearing: This cutting method involves using specialized machine blades to swiftly and accurately cut smaller diameter round bars.
When considering the cutting method for steel round bars, it is crucial to carefully assess the project's specific requirements and consult with experts to determine the most suitable approach.
Q: What are the different types of steel round bar surface treatments?
There are several different types of surface treatments that can be applied to steel round bars to enhance their appearance, durability, and resistance to corrosion. Some of the most common surface treatments include:
1. Hot-dip galvanizing: This process involves immersing the steel round bar in a bath of molten zinc to create a protective zinc coating. This coating helps to prevent rust and corrosion, making it ideal for outdoor applications.
2. Electroplating: Electroplating involves coating the steel round bar with a layer of another metal, such as chrome or nickel. This not only enhances the appearance of the bar but also improves its resistance to corrosion.
3. Powder coating: In this process, a dry powder is applied to the surface of the steel round bar electrostatically and then cured under heat. This creates a hard, durable, and attractive finish that is resistant to chipping, scratching, and fading.
4. Passivation: Passivation is a chemical process that removes impurities from the surface of the steel round bar, leaving behind a clean and corrosion-resistant layer. This treatment is commonly used for stainless steel bars to enhance their resistance to rust.
5. Black oxide coating: Black oxide coating is a conversion coating that forms a thin layer of black iron oxide on the surface of the steel round bar. This treatment provides mild corrosion resistance and also gives the bar a sleek black appearance.
6. Shot blasting: Shot blasting involves propelling abrasive materials at high speeds onto the surface of the steel round bar to remove any impurities or scale. This treatment not only improves the appearance but also creates a roughened surface that promotes better adhesion of coatings.
7. Acid pickling: Acid pickling is a process that removes scale and impurities from the surface of the steel round bar by immersing it in an acid bath. This treatment leaves the surface clean and free from any contaminants.
These are just a few examples of the various surface treatments available for steel round bars. The choice of treatment depends on factors such as the intended use of the bar, the desired appearance, and the level of corrosion resistance required.
Q: What are the tolerance levels for steel round bars?
Tolerance levels for steel round bars vary depending on the specific application and industry standards. Steel round bars are typically produced with tight dimensional tolerances to ensure their precise diameter, straightness, and surface finish. Common tolerance levels for steel round bars include diameter tolerances, straightness tolerances, and surface finish tolerances.
Diameter tolerances specify the acceptable range of deviation from the nominal diameter of the round bar. This tolerance is usually expressed as a plus or minus value, such as +/- 0.005 inches. The specific tolerance will depend on the size and type of steel round bar being produced, as well as the requirements of the application.
Straightness tolerances refer to the allowable amount of deviation from a perfectly straight line along the length of the round bar. This tolerance is typically expressed in terms of the maximum distance between the round bar and a straight edge placed along its length. For example, a straightness tolerance of 0.030 inches per foot means that a one-foot section of the round bar can deviate up to 0.030 inches from a straight line.
Surface finish tolerances specify the acceptable level of imperfections or irregularities on the surface of the round bar. This tolerance is often expressed in terms of roughness average (Ra) or roughness peak (Rz) values. The specific tolerance will depend on the desired surface finish and the application requirements.
It is important to note that tolerance levels may also be subject to industry-specific standards, such as those set by organizations like the American Society for Testing and Materials (ASTM) or the International Organization for Standardization (ISO). These standards provide guidelines and specifications for various steel products, including round bars, to ensure consistent quality and performance.
Ultimately, determining the tolerance levels for steel round bars involves considering the specific application requirements, industry standards, and the capabilities of the manufacturing process.
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