20Cr Steel Round Bar SAE520 Steel Round Bar

20Cr Steel Round Bar SAE520 Steel Round Bar

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 50000 m.t./month

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Specification

Type:

Alloy Steel

Shape:

Steel Round Bar

20Cr Steel Round Bar SAE520 Steel Round Bar

Product Description:

1.Standard:40Cr,20Cr, 40CrMo4,SCM440,AISI4140, etc.
2.Diameter:25mm-450mm

3.Length:5.8/6m-12m or as required

4.Application:re-manufacture, structural steel etc.

5.Certificates:ISO9001:2008,ISO14001:2004,OHSAS18001

6.Packing: In bundles,Standard export sea-worthy packing or as customer's requirement

7.Shipment: by bulk or by container

8.Quality Contation

Both end of each bar must be cut.

Ladle furnanced and vacuum de-gassed

Show heat No. on each bar

Surface condition the surface of the hot rolled square bar shall befree cracks, scar and wrinkles that affect the use of the

billets. In case there is the above-mentioned defect, it shall be remove.

The mill test certificate shall show the chemical composition, and it is guaranteed that the chemical composition shall be

within the limit stipulated in the contract.

Chemical composition:

Grade	C	Si	Mn	Cr
20Cr	0.18-0.24	0.17-0.37	0.5-0.8	0.7-0.9

Specification:

OD	Length	Material	Standard	Technique
16-260mm	6-12m or aques per request	20#	GB ASTM DIN	Hot rolled
16-350mm		45#		Hot rolled
200-500mm		45#		Forged
20-250mm		20Cr,40Cr,20-42CrMo		Hot rolled
50-300mm		GCr15		Hot rolled

Application:

Hot rolled alloy structure steel round bar are widely used in machinery making, autombile making, railway, mine machinery, petoleum machinry, agricultural machinery and civil archtectue such as all kinds of shafts, screws, connecting rods, hardware tools, gears, standard parts, spanners fasteners, structural parts for automobile and agricultural machinery, outer and iner sleeves, rollers and balls for bearing making.

Product Show:

20Cr Steel Round Bar SAE520 Steel Round Bar

Q: What are the different methods for improving the toughness of tool steels used in special steel?: There are several methods available for improving the toughness of tool steels used in special steel applications. These methods are aimed at enhancing the resistance of the steel to fracture and increasing its ability to absorb energy without undergoing brittle failure. Some of the different methods for improving the toughness of tool steels include: 1. Alloying: The addition of specific alloying elements such as chromium, molybdenum, vanadium, and tungsten can significantly enhance the toughness of tool steels. These alloying elements form carbides within the steel matrix, which helps to improve its toughness. 2. Heat treatment: Proper heat treatment can greatly improve the toughness of tool steels. Processes such as quenching and tempering are commonly employed to achieve the desired level of toughness. Quenching involves rapidly cooling the steel from high temperatures, resulting in a hardened structure. Tempering follows quenching and involves reheating the steel to a specific temperature and then cooling it slowly. This process helps to relieve internal stresses and increases toughness. 3. Controlled cooling rates: By controlling the cooling rate during heat treatment, it is possible to optimize the toughness of tool steels. Slow cooling rates allow for the formation of a more uniform microstructure, leading to improved toughness. 4. Grain refinement: Refining the grain size of the steel can enhance its toughness. This can be achieved through processes such as hot working, controlled rolling, or adding grain refining elements like titanium or zirconium. 5. Surface treatments: Certain surface treatments, such as shot peening or nitriding, can improve the toughness of tool steels. Shot peening involves bombarding the surface of the steel with small metal or ceramic particles, inducing compressive residual stresses that enhance toughness. Nitriding involves diffusing nitrogen into the surface of the steel, forming a hard and wear-resistant layer that improves toughness. 6. Cryogenic treatment: Cryogenic treatment involves subjecting the tool steel to extremely low temperatures, typically below -100°C (-148°F), for an extended period. This process helps to refine the microstructure and reduce residual stresses, leading to improved toughness. 7. Powder metallurgy: Powder metallurgy techniques, such as hot isostatic pressing or sintering, can produce tool steels with improved toughness. By using a fine powder and applying high pressure and temperature, a more uniform and fine-grained microstructure can be achieved, resulting in increased toughness. Overall, the selection and combination of these methods depend on the specific requirements of the tool steel and the intended application. By carefully considering these techniques, manufacturers can enhance the toughness of tool steels, ensuring their suitability for demanding special steel applications.

Q: How does spring steel maintain its elasticity?: Spring steel maintains its elasticity due to its unique composition and manufacturing process. It is made from a specific type of high-carbon steel that undergoes a specialized heat treatment called quenching and tempering. This process involves heating the steel to a high temperature and then rapidly cooling it in water or oil, followed by reheating to a specific temperature and allowing it to cool slowly. This heat treatment creates a fine-grained microstructure in the steel, which gives it the ability to withstand repeated bending or twisting without permanently deforming. Additionally, the high carbon content in spring steel enhances its strength and resilience, allowing it to return to its original shape even after being subjected to significant force or pressure.

Q: How does special steel perform in abrasive wear applications?: Special steel is known for its excellent performance in abrasive wear applications. It is specifically designed to withstand the harsh conditions and high levels of abrasion that occur in various industrial processes. One of the key features of special steel is its exceptional hardness. It is able to resist the abrasive forces exerted by different materials, such as rocks, sand, or minerals, without experiencing significant wear or deterioration. This hardness is achieved through a combination of alloying elements and heat treatment processes, which enhance the steel's ability to retain its structural integrity even under extreme wear conditions. Additionally, special steel often possesses a high level of toughness, which allows it to absorb impact and resist fracture or chipping. This property is particularly important in abrasive wear applications, where materials constantly collide and generate high levels of stress. The toughness of special steel enables it to withstand these impacts and maintain its performance over a long period of time. Furthermore, special steel can exhibit excellent resistance to corrosion, which is crucial in abrasive wear applications that involve exposure to moisture, chemicals, or other corrosive agents. This resistance ensures that the steel does not deteriorate or lose its effectiveness due to chemical reactions or oxidation, extending its lifespan and reducing maintenance requirements. In summary, special steel performs exceptionally well in abrasive wear applications due to its hardness, toughness, and corrosion resistance. These properties enable it to withstand the harsh conditions and high levels of abrasion encountered in various industrial processes, ensuring long-lasting performance and reduced downtime.

Q: How does special steel perform in terms of weldability?: Special steel generally performs well in terms of weldability. It has good ductility and can be easily welded using various welding methods such as arc welding, resistance welding, and laser welding. The composition and properties of special steel are specifically designed to ensure that it can be successfully welded without compromising its strength and integrity. However, the specific weldability of special steel may vary depending on its exact composition and specific grade. It is always recommended to consult the manufacturer's guidelines and follow proper welding procedures to achieve the best results when working with special steel.

Q: What are the common failures or issues with special steel?: There are several common failures or issues that can occur with special steel. One of the most common issues is corrosion. Special steel, like any other type of steel, can be prone to corrosion when exposed to certain environmental conditions, such as moisture or aggressive chemicals. This can lead to a decrease in its structural integrity and overall performance. Another common failure is fatigue. Special steel is often used in applications that require high strength and durability. However, repetitive loading or stress can cause the material to develop cracks or fractures over time, leading to fatigue failure. This can be particularly problematic in industries such as aerospace or automotive, where components are subjected to constant cyclic loading. In addition, improper heat treatment can result in failure. Special steel often requires specific heat treatments to achieve desired properties such as hardness or toughness. If the heat treatment process is not carried out correctly, it can lead to inconsistent material properties, resulting in reduced performance or premature failure. Welding issues can also occur with special steel. Welding is commonly used to join different components or structures made of special steel. However, if proper welding techniques and procedures are not followed, it can result in the formation of defects such as weld cracks, porosity, or inadequate fusion. These defects can weaken the weld joint and compromise the overall integrity of the structure. Lastly, dimensional instability can be a problem with special steel. Certain types of special steel, such as those with high carbon content, can exhibit dimensional changes when subjected to temperature variations. This can lead to distortion or warping of the material, affecting its fit, function, or assembly with other components. To mitigate these failures or issues with special steel, it is crucial to follow proper material selection, design, manufacturing, and maintenance practices. Conducting thorough inspections, implementing appropriate corrosion protection measures, and ensuring proper heat treatment and welding procedures can help minimize the occurrence of these failures and enhance the performance and longevity of special steel components.

Q: What are the thermal conductivity properties of special steel?: Special steels, also known as alloy steels, exhibit varying thermal conductivity properties depending on their composition and specific heat treatment. The thermal conductivity of special steel generally ranges from 10 to 50 W/mK. The thermal conductivity of steel is primarily influenced by its carbon content, alloying elements, and microstructure. Carbon acts as a thermal conductor in steel, increasing its thermal conductivity. However, alloying elements such as chromium, nickel, and molybdenum can reduce the thermal conductivity of steel due to their lower thermal conductivity compared to iron. Additionally, the microstructure of special steel plays a crucial role in determining its thermal conductivity. Heat treatments such as quenching and tempering can alter the microstructure, affecting the thermal conductivity of the steel. For example, steels with a higher carbon content and a martensitic microstructure tend to have higher thermal conductivity compared to steels with lower carbon content and a ferritic or pearlitic microstructure. It is important to note that the thermal conductivity of special steel can also be influenced by other factors such as impurities, grain size, and the presence of defects. These factors can either enhance or reduce the thermal conductivity. In summary, the thermal conductivity properties of special steel can vary depending on its composition, heat treatment, and microstructure. Therefore, it is essential to consider these factors when evaluating the thermal conductivity of special steel for specific applications.

Q: What are the limitations of using special steel in marine environments?: Special steel can be susceptible to corrosion and pitting when exposed to saltwater in marine environments. Additionally, the high cost and difficulty in sourcing and maintaining special steel can also be limiting factors.

Q: What are the different impact-resistant grades of special steel?: Impact-resistant grades of special steel refer to steel alloys that are specifically designed to withstand high impact and shock loads without fracturing or deforming. These grades of steel are commonly used in applications where resistance to impact and toughness are crucial, such as in construction, mining, automotive, and defense industries. There are several different impact-resistant grades of special steel available, each with its own unique characteristics and properties. Some of the commonly used impact-resistant grades include: 1. AR400: This grade of steel has a nominal hardness of 400 Brinell (HB) and is known for its exceptional resistance to abrasion and impact. It is often used in applications where high wear resistance is required, such as in bucket liners, crushers, and hoppers. 2. AR500: With a nominal hardness of 500 HB, AR500 steel offers even higher resistance to wear and impact compared to AR400. It is commonly used in applications involving heavy machinery, mining equipment, and armored vehicles. 3. AR600: This grade of steel has a nominal hardness of 600 HB, making it one of the toughest and most impact-resistant steels available. It is often used in applications where extreme wear resistance and durability are essential, such as in chutes, conveyors, and ballistic protection. 4. T-1: T-1 steel is a high-strength, low-alloy (HSLA) steel that offers excellent impact resistance and toughness. It is typically used in applications where high strength and toughness are required, such as in structural components, heavy equipment, and offshore drilling rigs. 5. QT or Quenched and Tempered Steels: These steels are specifically heat-treated to enhance their toughness and impact resistance. They are commonly used in applications that require a combination of high strength, toughness, and impact resistance, such as in gears, shafts, and armor plates. It is important to note that the specific impact resistance of a steel grade depends not only on its composition but also on factors such as heat treatment, fabrication techniques, and design considerations. Therefore, it is crucial to consult with steel manufacturers or experts to determine the most suitable impact-resistant grade for a particular application.

Q: Can special steel be used in the wastewater treatment industry?: Yes, special steel can be used in the wastewater treatment industry. Special steel, such as stainless steel or corrosion-resistant alloys, is commonly used in the construction of wastewater treatment equipment and infrastructure due to its durability, resistance to corrosion, and ability to withstand harsh chemical environments. These properties make special steel an ideal choice for components like pipes, tanks, pumps, and screens, ensuring long-term reliability and performance in wastewater treatment processes.

Q: What are the properties of boron steel?: Boron steel, also known as boron-alloyed steel, possesses several unique properties. It is exceptionally strong and has a high tensile strength, making it ideal for applications that require high-strength materials. Boron steel also exhibits good hardenability, meaning it can be hardened by heat treatment processes such as quenching and tempering. Additionally, it has excellent wear resistance and is often used in the manufacturing of cutting tools and wear-resistant components. Moreover, boron steel offers good weldability and formability, allowing it to be easily shaped and joined. Overall, the properties of boron steel make it a valuable material in various industries, including automotive, construction, and tool manufacturing.

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