SAE 1020 Carbon Steel Round Bar of CNBM

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 50000 m.t./month

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Specification

Type:

Carbon Steel

Shape:

Steel Round Bar

SAE 1020 Carbon Steel Round Bar of CNBM

Product Description

1. Steel grade: SAE1020, 20#, C22, S20C

2. Length: 6M-12M
3. Diameter: 16mm-300mm

4. Product range: round bar, flat bar, square bar

5. Technique: Hot rolled, forged, cold drawn

Specification:

Material	SAE 1020	Round bar	Dia(mm)	16-300mm
Process	EAF + LF + VD + Forged + Heat Treatment (optional)	Round bar	Length (mm)	Max 12m
Heat treatment	Normalized / Annealed / Quenched / tempered	Flat bar	Thickness(mm)	8-500mm
Delivery condition	Hot forged +Rough machined (black surface after Q/T)+ Turned (optional)		Width(mm)	70-200mm
Test	Ultrasonic test according to SEP 1921-84 D/d		Length (mm)	Max 12m

Chemical Composition

C	Si	Mn	Cr	Ni	Cu
0.17~0.23	0.17~0.37	0.35~0.65	≤0.25	≤0.30	≤0.25

Packing and Delivery:

Packing in bundle package, or as customer's requirements.

Delivery Detail: 45 days after receiving the deposit.

Usage and Applications
1. Steel round bar is used in a large number of architectural and engineering structures. Or it can be used in construction of plants for the production of steel house frames, high-voltage transmission towers, bridges, vehicles, boilers, containers, ships, etc.

2. And we can use this kind of product on the performance of the mechanical parts if the demand is not very high.

3. Some special material steel round bar can be used for main shaft of steamer, hummer shank, with big section and supper force.

Product Show

SAE 1020 Carbon Steel Round Bar of CNBM

Q: What are the different forms of special steel available in the market?: In the market, one can find various types of special steel, each possessing its own distinct characteristics and uses. Here are some of the most commonly encountered forms: 1. Stainless Steel: A versatile variant of special steel, this type exhibits exceptional resistance to corrosion and staining. It finds widespread application in the manufacturing of cutlery, kitchen appliances, and medical equipment. 2. Tool Steel: Highly durable and resistant to wear and tear, this special steel is primarily employed in the production of cutting tools, molds, and dies. 3. High-speed Steel: Designed to withstand elevated temperatures and maintain hardness even at high speeds, this form is commonly utilized in the creation of drill bits, saw blades, and gear cutters. 4. Alloy Steel: To enhance strength and durability, alloying elements like chromium, nickel, or molybdenum are added to this special steel. It finds extensive use in the automotive industry, construction, and machinery manufacturing. 5. Carbon Steel: This cost-effective type of special steel is favored for its high strength-to-weight ratio. It is commonly employed in the construction of buildings, bridges, and pipelines. 6. Maraging Steel: Known for its exceptional strength and toughness, this low-carbon, high-nickel steel is frequently employed in aerospace and defense applications, including aircraft components and missile casings. 7. Spring Steel: Engineered to withstand high stress and retain its shape under heavy loads, this special steel is widely used in the production of springs, such as those found in automotive suspensions and mechanical devices. These examples merely scratch the surface of the diverse range of special steel available in the market. Each type possesses its own unique properties and applications, rendering them suitable for a multitude of industries and manufacturing processes.

Q: What are the different methods for improving the tensile strength of special steel?: There are several methods for improving the tensile strength of special steel. 1. Alloying: One common method is to add alloying elements such as chromium, nickel, molybdenum, or vanadium to the steel. These elements form solid solutions with the iron matrix, enhancing the strength and hardness of the steel. Alloying also improves the steel's resistance to corrosion and wear. 2. Heat treatment: Heat treatment is another effective method for increasing the tensile strength of special steel. Processes like quenching, tempering, and annealing are commonly used. Quenching involves rapidly cooling the steel from a high temperature, which creates a hardened microstructure. Tempering then reduces the brittleness and improves the toughness of the steel. Annealing, on the other hand, involves heating the steel to a specific temperature and then slowly cooling it, which can refine the grain structure and enhance its strength. 3. Cold working: Cold working, also known as cold rolling or cold drawing, involves subjecting the steel to plastic deformation at low temperatures. This process increases the dislocation density in the steel, resulting in strain hardening and improved strength. Cold working can significantly enhance the tensile strength of special steel. 4. Grain refinement: Refining the grain structure of the steel can also improve its tensile strength. This can be achieved through processes like recrystallization annealing, which involves heating the steel to a specific temperature and then cooling it slowly to promote the formation of smaller and more uniform grains. Smaller grain size leads to increased strength and improved mechanical properties. 5. Shot peening: Shot peening is a technique that involves bombarding the surface of the steel with small metallic or ceramic particles. This process induces compressive stresses in the surface layer of the steel, which helps to inhibit crack initiation and propagation, ultimately improving the tensile strength and fatigue resistance of the steel. It is important to note that the choice of method for improving tensile strength depends on the specific application and requirements of the special steel. Various combinations of these methods can be employed to achieve the desired mechanical properties.

Q: How does special steel perform in high-pressure and high-temperature environments?: Special steel is specifically designed to perform exceptionally well in high-pressure and high-temperature environments. It possesses unique properties that enable it to withstand extreme conditions without undergoing deformation, corrosion, or failure. One of the primary characteristics of special steel is its high strength. It is engineered to have superior mechanical properties, such as excellent tensile strength, which allows it to resist the immense pressure exerted on it in high-pressure environments. This strength ensures that the steel can maintain its structural integrity and not buckle or collapse under the immense force. Furthermore, special steel is highly resistant to corrosion and oxidation, even at high temperatures. This resistance is crucial in high-temperature environments where the presence of hot gases, steam, or caustic chemicals can cause regular steel to degrade rapidly. Special steel's resistance to corrosion and oxidation ensures its longevity and reliability, making it an ideal choice for applications in such challenging conditions. Additionally, special steel exhibits excellent heat resistance. It can withstand extreme temperatures without losing its mechanical properties, such as strength and hardness. This characteristic is crucial in high-temperature environments where regular steel would weaken, soften, or even melt. Special steel's ability to maintain its structural stability even in extreme heat ensures the safety and reliability of equipment and structures operating in such conditions. Moreover, special steel is known for its excellent thermal conductivity. This property allows it to efficiently transfer heat away from the high-temperature environment, preventing localized hotspots and thermal stress. By effectively dissipating heat, special steel ensures the overall stability and performance of equipment and structures under high-pressure and high-temperature conditions. In summary, special steel performs exceptionally well in high-pressure and high-temperature environments due to its high strength, resistance to corrosion and oxidation, heat resistance, and excellent thermal conductivity. These properties make special steel a reliable and durable material for various applications, including power generation, oil and gas exploration, aerospace engineering, and many more.

Q: What are the main factors affecting the creep resistance of special steel?: The main factors affecting the creep resistance of special steel are composition, microstructure, and processing conditions. Composition plays a critical role in determining the creep resistance of special steel. The presence of alloying elements such as chromium, molybdenum, and vanadium can enhance the creep resistance by forming stable precipitates or carbides that impede dislocation movement. These alloying elements also contribute to the formation of a protective oxide layer, which can further improve the resistance to creep. Microstructure is another important factor affecting creep resistance. Fine-grained structures, achieved through proper heat treatment or alloying, can hinder dislocation movement and enhance the strength of the material, thereby improving creep resistance. Additionally, the presence of grain boundaries can act as barriers to dislocation motion, reducing the creep rate. Processing conditions, including heat treatment and deformation processes, can significantly influence the creep resistance of special steel. The choice of heat treatment parameters, such as temperature and cooling rate, can affect the precipitation of strengthening phases and the formation of a desirable microstructure. Proper deformation processing, such as hot working or cold working, can refine the grain structure and enhance the creep resistance. Other factors that can affect the creep resistance of special steel include temperature, stress, and time. Higher temperatures can accelerate creep deformation, while higher applied stresses can increase the creep rate. The duration of exposure to elevated temperatures and stresses also plays a role, as prolonged exposure can lead to creep failure. In conclusion, the creep resistance of special steel is influenced by various factors, including composition, microstructure, processing conditions, temperature, stress, and time. By carefully considering and optimizing these factors, the creep resistance of special steel can be enhanced, making it suitable for high-temperature and long-term applications.

Q: How is special steel used in the production of surgical instruments?: Special steel is used in the production of surgical instruments due to its unique properties such as corrosion resistance, high strength, and ability to maintain sharpness. This steel is specifically designed to meet the demanding requirements of surgical tools, ensuring durability and precision during procedures.

Q: How does special steel perform in terms of fatigue strength?: Special steel typically demonstrates excellent fatigue strength compared to other types of steel. This is due to its enhanced composition and specific manufacturing processes, which result in improved resistance to cyclic loading and repetitive stress. The unique properties of special steel make it highly suitable for applications that require exceptional durability and long-term performance under dynamic conditions.

Q: How does special steel contribute to sustainability?: Special steel contributes to sustainability in several ways. Firstly, it is highly durable and has a longer lifespan compared to traditional steel, reducing the need for frequent replacements and minimizing waste. Additionally, special steel can be recycled and reused multiple times without losing its properties, reducing the demand for new raw materials and energy consumption in the production process. Furthermore, special steel offers superior strength and lightweight characteristics, enabling the development of more fuel-efficient vehicles and structures, thus reducing carbon emissions. Overall, special steel's durability, recyclability, and energy efficiency make it a key material in promoting sustainable practices in various industries.

Q: What are the different heat treatment defects in special steel?: During the heat treatment process of special steel, various defects can occur. Some of the most frequently encountered defects are as follows: 1. Decarburization: This defect arises when the steel's outer layers lose carbon due to exposure to high temperatures in an environment rich in oxygen. The consequence of decarburization is reduced hardness and strength in the treated steel. 2. Quench cracking: Also known as cracking during quenching, this defect emerges when the steel undergoes rapid cooling subsequent to heating. The differential cooling rates can induce internal stresses, resulting in cracks within the material. 3. Distortion: Distortion refers to alterations in the shape or dimensions of the steel during the heat treatment process. It can be caused by uneven heating or cooling, inadequate fixturing, or improper quenching techniques. 4. Soft spots: Soft spots are localized areas of reduced hardness in the treated steel. These spots can occur due to insufficient heating or improper quenching, leading to diminished mechanical strength in those regions. 5. Overheating: Overheating is a defect that occurs when the steel is subjected to excessively high temperatures during the heat treatment process. This can lead to grain growth, reduced toughness, and overall decreased material properties. 6. Case hardening problems: Special steels often undergo case hardening processes, such as carburizing or nitriding, to create a hardened outer layer. However, several defects can arise during these processes, including inadequate or excessive hardening, poor case depth, or uneven distribution of hardness. 7. Residual stresses: Residual stresses are internal stresses that persist in the steel after the heat treatment process. If not properly controlled, these stresses can cause dimensional instability, warping, or even cracking. To prevent or minimize these heat treatment defects, it is crucial to adhere to proper heat treatment procedures. This includes precise temperature control, appropriate cooling rates, and suitable fixturing techniques. Furthermore, the use of high-quality heat treatment equipment, close monitoring of the process, and thorough inspections can aid in detecting and rectifying any potential defects in special steel.

Q: How does special steel contribute to the chemical resistance of products?: Special steel, also known as stainless steel, contributes significantly to the chemical resistance of products due to its unique composition and properties. These steels contain a high percentage of chromium, which forms a thin, passive oxide layer on the surface of the steel. This oxide layer acts as a protective barrier, preventing corrosive substances from coming into direct contact with the steel and causing chemical reactions. The chromium in special steel forms a stable oxide layer that is highly resistant to corrosion, even in harsh chemical environments. This oxide layer is self-repairing, meaning that if it is damaged or scratched, it will quickly reform and continue to protect the steel. Additionally, the presence of other alloying elements such as nickel and molybdenum further enhances the chemical resistance of special steel. The chemical resistance of special steel extends to a wide range of corrosive substances, including acids, alkalis, and salts. This makes it highly suitable for applications in various industries such as chemical processing, pharmaceuticals, food processing, and marine environments. By using special steel in the manufacturing of products, the risk of chemical degradation and corrosion is significantly reduced. This leads to increased product lifespan, improved performance, and reduced maintenance costs. Furthermore, it ensures that the integrity and safety of the products are maintained, as chemical resistance is crucial in preventing leaks, contamination, and structural failures. In summary, special steel contributes to the chemical resistance of products by forming a protective oxide layer on its surface, which shields it from corrosive substances. Its unique composition and properties make it highly resistant to chemical degradation, ensuring the longevity and reliability of products in various industrial applications.

Q: Can special steel be used in the production of luxury goods?: Yes, special steel can be used in the production of luxury goods. Special steel is known for its exceptional strength, durability, and unique properties, making it an ideal material for creating high-quality and exclusive products. Its use in luxury goods such as watches, jewelry, high-end cutlery, and designer accessories can enhance their aesthetic appeal, performance, and overall value.

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