Special Steel SCM420H Steel Bar Structural Steel

Special Steel SCM420H Steel Bar Structural Steel System 1

Special Steel SCM420H Steel Bar Structural Steel

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 30 m.t.

Supply Capability:: 10000 m.t./month

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Product Information

1 Standards and Chemical Composition:

GB	DIN	JIS	BS
20CrMo	25CrMo4	SCM420	25CrMo4

C	Si	Mn	P	S	Cr	Ni	Cu
0.17-0.23	0.15-0.35	0.55-0.90	0.030	0.030	0.85-1.25	0.30	0.30

2 Mechanical Property:

Yield Strength (MPa)	≥685
Tensile Strength (MPa)	≥885
Elongation (%)	≥12
Hardness (HB)	≤197
Reduction in Area (%)	≥50
AKV (J)	≥78

3 Brief Introduction:

Dimension	14-350mm
Length	2-13m or as per your request
Delivery condition	Hot rolled
Heat Treatment	Normalizing, Annealing, Quenching
Packing	Standard seaworthy packing or according to your requirements

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Special Steel SCM420H Steel Bar Structural Steel

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Special Steel SCM420H Steel Bar Structural Steel

Shipping

1. FedEx/DHL/UPS/TNT for samples, Door-to-Door;

2. By Air or by Sea for batch goods, for FCL; Airport/ Port receiving;

3. Customers specifying freight forwarders or negotiable shipping methods!

Delivery Time: 3-7 days for samples; 5-25 days for batch goods.

Payment Terms

1.Payment: T/T, L/C, Western Union, MoneyGram,PayPal; 30% deposits; 70% balance before delivery.

2.MOQ: 1pcs

3.Warranty : 3 years

4.Package Informations: 1) EXPORT, In 20 feet (GW 25 ton) or 40 feet Container (GW 25 ton)

2)as customer's requirement

Why choose us?

(1) The leading exporter in China special steel industry.

(2) Large stocks for various sizes, fast delivery date.

(3) Good business relationship with China famous factories.

(4) More than 7 years steel exporting experience.

(5) Good after-sales service guarantee.

Q: What are the different power generation grades of special steel?: Within the power generation industry, there are numerous grades of special steel used for different applications. These grades are specifically engineered to withstand the extreme conditions encountered in power plants, including high temperatures, pressures, and corrosive environments. One widely used grade is 9Cr-1Mo-V steel, also referred to as Grade 91. This high-strength, low-alloy steel is commonly employed in the construction of boiler components such as headers, tubes, and turbine rotors. Grade 91 steel offers exceptional creep strength, oxidation resistance, and thermal stability, making it well-suited for operations at elevated temperatures. Another commonly utilized grade in power generation is 12Cr-1Mo-V steel, also known as Grade 11. It finds primary application in the fabrication of superheater and reheater tubes for power boilers. Grade 11 steel exhibits good strength at high temperatures, corrosion resistance, and weldability, which makes it an ideal choice for these specific purposes. Furthermore, the power generation industry often employs a grade called 2.25Cr-1Mo steel, or Grade 22, in the construction of pressure vessels and piping systems within power plants. This grade is highly regarded for its outstanding resistance to creep, high-temperature strength, and ability to withstand hydrogen attack. It is therefore deemed suitable for critical components within power generation facilities. Moreover, there exist other specialized grades such as 5Cr-0.5Mo steel, or Grade 5, and 9Cr-0.5Mo steel, or Grade 9, which find application in specific power generation scenarios involving elevated temperatures and pressures. These grades offer a combination of strength, corrosion resistance, and thermal stability, ensuring dependable performance in demanding environments. In conclusion, the power generation industry relies on a variety of special steel grades that are specifically tailored to meet the unique requirements of power plants. These grades possess crucial properties such as high-temperature strength, corrosion resistance, and more, which are essential for efficient and reliable power generation operations.

Q: What are the different coating and plating options for special steel?: The different coating and plating options for special steel include electroplating, hot-dip galvanizing, powder coating, PVD (Physical Vapor Deposition) coating, and ceramic coating. Each option offers unique benefits such as increased corrosion resistance, improved aesthetics, enhanced durability, or specific functional properties, allowing the special steel to be tailored to various applications and environments. The choice of coating or plating depends on factors such as the desired outcome, budget, substrate material, and intended use of the special steel.

Q: How does special steel contribute to the machinability of products?: Special steel contributes to the machinability of products by offering enhanced properties such as higher strength, improved wear resistance, and increased hardness. These qualities allow for easier cutting, shaping, and forming during the machining process. Additionally, special steel may contain alloying elements that improve its thermal conductivity and reduce the risk of deformation or cracking, leading to better overall machinability.

Q: What are the properties of magnetic stainless steel?: Magnetic stainless steel is a type of stainless steel that exhibits magnetic properties due to its high iron content. It possesses good corrosion resistance, durability, and high strength, making it suitable for various applications. Additionally, it is easily formable and weldable, allowing for versatility in manufacturing processes.

Q: How does special steel contribute to the defense and security industry?: Special steel contributes to the defense and security industry by offering exceptional strength, durability, and resistance to extreme conditions. It is used in the production of various critical components such as armored vehicles, aircraft carriers, submarines, and ballistic protection systems. Special steel's unique properties enhance the performance and reliability of these defense systems, ensuring their effectiveness in safeguarding national security.

Q: How does special steel withstand extreme temperatures?: Special steel is able to withstand extreme temperatures due to its unique composition and production process. One key factor is the addition of alloying elements such as chromium, molybdenum, and nickel, which enhance the steel's heat resistance. These elements form stable oxides on the surface of the steel, creating a protective barrier against oxidation and corrosion at high temperatures. Furthermore, special steel undergoes specialized heat treatment methods like quenching and tempering, which refine its microstructure and improve its mechanical properties. This process enhances the steel's ability to maintain its strength and hardness even when exposed to extreme temperatures. Additionally, the manufacturing process of special steel involves precision and control over the cooling rate during its production. This controlled cooling prevents the formation of brittle phases, ensuring that the steel retains its toughness and ductility at both high and low temperatures. Moreover, the grain size of special steel is carefully controlled through techniques like grain refinement, which leads to a more homogeneous and fine-grained microstructure. This fine-grained structure enhances the steel's resistance to thermal fatigue and creep, allowing it to withstand prolonged exposure to extreme temperatures without significant degradation. Overall, the combination of alloying elements, specialized heat treatment processes, controlled cooling, and refined microstructure makes special steel highly capable of withstanding extreme temperatures while maintaining its structural integrity and mechanical properties.

Q: How does special steel contribute to the construction equipment industry?: Special steel plays a crucial role in the construction equipment industry by providing the necessary strength, durability, and resistance to wear and tear that is required in heavy-duty equipment. Construction equipment is subjected to extreme conditions, including heavy loads, harsh environments, and constant use. Special steel alloys are specifically designed to withstand these conditions and ensure the longevity and reliability of the equipment. One of the key contributions of special steel to the construction equipment industry is its high strength-to-weight ratio. This allows manufacturers to design and produce equipment that is both strong and lightweight. The use of special steel in the construction of equipment components such as chassis, booms, buckets, and blades increases their load-carrying capacity and improves overall performance. Special steel also offers excellent resistance to corrosion, which is a significant advantage in construction sites that expose equipment to moisture, chemicals, and other corrosive substances. By using corrosion-resistant special steel alloys, manufacturers can prolong the lifespan of construction equipment and reduce maintenance costs. Furthermore, special steel contributes to the construction equipment industry by providing superior wear resistance. Construction equipment is subjected to abrasive materials such as rocks, gravel, and concrete, which can cause significant wear on the equipment's components. Special steel alloys with high hardness and wear resistance properties help minimize wear and extend the equipment's service life, reducing the need for frequent replacements and downtime. In addition, special steel enables the construction equipment industry to meet specific performance requirements. Different types of special steel alloys can be tailored to meet specific needs such as impact resistance, high-temperature resistance, or low-temperature toughness. This versatility allows manufacturers to produce equipment that can operate efficiently in a wide range of conditions, enhancing the industry's overall productivity. Overall, special steel contributes significantly to the construction equipment industry by providing the necessary strength, durability, resistance to wear and tear, and customization options. By utilizing special steel alloys, manufacturers can produce high-quality equipment that meets the demanding requirements of construction sites, ultimately improving productivity, safety, and efficiency in the industry.

Q: What are the different heat treatment grades of special steel?: There are several different heat treatment grades of special steel, each with its own unique properties and applications. Some of the commonly used heat treatment grades include: 1. Annealed Steel: This grade of special steel is treated through the annealing process, which involves heating the steel to a specific temperature and then cooling it slowly to enhance its ductility and reduce its hardness. Annealed steel is typically used in applications where toughness and machinability are required. 2. Normalized Steel: Normalizing is a heat treatment process that involves heating the steel above its critical temperature and then cooling it in still air. This treatment refines the grain structure of the steel, improves its mechanical properties, and reduces internal stresses. Normalized steel is often used in applications where high strength and good weldability are desired. 3. Quenched and Tempered Steel: This grade of special steel undergoes a two-step heat treatment process. Firstly, the steel is heated to a high temperature and then rapidly cooled in a quenching medium such as oil or water. This process results in a hardened and brittle steel. To regain some toughness and reduce brittleness, the steel is then tempered by reheating it to a lower temperature. Quenched and tempered steel is commonly used in applications that require high strength, such as construction machinery, mining equipment, and automotive parts. 4. Precipitation Hardening Steel: This grade of special steel is treated by a combination of heat treatment and precipitation hardening. The steel is initially solution treated at high temperatures to dissolve alloying elements, followed by rapid cooling to retain a supersaturated solid solution. Subsequently, the steel is aged at a lower temperature for a specific period of time, allowing the formation of fine precipitates that contribute to increased strength and hardness. Precipitation hardening steel is utilized in applications where high strength and corrosion resistance are essential, such as aerospace components and high-performance tools. 5. Case Hardening Steel: Case hardening is a surface heat treatment process used to increase the hardness of the outer layer of steel while maintaining a tough and ductile core. This is achieved by carburizing or nitriding the steel, which introduces carbon or nitrogen into the surface layer, respectively. Case hardening steel is commonly used in applications requiring wear resistance, such as gears, bearings, and camshafts. These are just a few examples of the various heat treatment grades available in special steel. Each grade offers unique properties and advantages, allowing for a wide range of applications across different industries.

Q: What properties make special steel unique?: Special steel is unique due to its exceptional properties such as high strength, excellent corrosion resistance, superior heat resistance, and remarkable wear resistance. It possesses a combination of various alloying elements like chromium, nickel, molybdenum, and vanadium, which enhance its mechanical properties and make it suitable for a wide range of applications in industries such as automotive, aerospace, and construction. Additionally, special steel can be tailored through precise manufacturing processes to exhibit specific characteristics, making it a versatile and highly sought-after material.

Q: How does special steel contribute to the manufacturing of shafts and axles?: Special steel plays a crucial role in the manufacturing of shafts and axles due to its unique properties and characteristics. Special steel is specifically designed and engineered to have superior strength, durability, and resistance to wear and tear, making it an ideal material for these critical components in the automotive and machinery industries. One of the main advantages of special steel is its high tensile strength. Shafts and axles are subjected to significant loads and torque, especially in heavy-duty applications. Special steel, with its exceptional strength, allows these components to withstand these forces without deformation, ensuring optimal performance and longevity. Furthermore, special steel offers excellent fatigue resistance, which is essential for parts that undergo cyclic loading, such as shafts and axles. Fatigue failure is a common issue in these components, particularly in high-speed rotating applications. Special steel's ability to resist fatigue helps prevent fractures and extends the lifespan of shafts and axles, minimizing downtime and maintenance costs. Another critical property of special steel is its high hardness. This hardness provides superior wear resistance, enabling shafts and axles to withstand the abrasive forces encountered during operation. By reducing wear and minimizing surface damage, special steel ensures the continued efficiency and reliability of these components. Moreover, special steel can be heat-treated to enhance its mechanical properties further. Through processes like quenching and tempering, the steel's hardness, toughness, and strength can be selectively modified to suit specific shaft and axle applications. This flexibility allows manufacturers to tailor the material properties to meet the required specifications and performance standards. In summary, special steel significantly contributes to the manufacturing of shafts and axles by providing exceptional strength, fatigue resistance, hardness, and wear resistance. These properties ensure the durability, reliability, and optimal performance of these critical components in various industries, ultimately leading to safer and more efficient machinery and vehicles.

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