Special Steel JIS SCr440 Alloy Steel Round Bars

Special Steel JIS SCr440 Alloy Steel Round Bars System 1

Special Steel JIS SCr440 Alloy Steel Round Bars

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 20 m.t.

Supply Capability:: 10000 m.t./month

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Product information:

Standard				JIS G4053-2003
Grade				JIS SCr440
MOQ				1 Metric Ton
Diameter				8mm~1500mm
Length				6m,12m or as required.
Diameter Tolerance				As required
Condition of delivery				Hot rolled,Cold Rolled or as required.
Chemical Composition(%)
C	Si		Mn			P		S		Cr
0.37-0.44	0.17-0.37		0.50-0.80			≤0.035		≤0.035		0.80-1.10
Ni	Cu
≤0.30	≤0.030
Mechanical Properties(In Quenching and Tempering)
Tensile strength		Yield strength			Elongation		Reduction in Area		Impact		Hardness
(σb/MPa)		(σs/MPa)			(δ5/%)		(ψ/%)		(J)		(HB)
≥980		≥785			≥9		≥45		≥47		≤207

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Special Steel JIS SCr440 Alloy Steel Round Bars

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: How does special steel perform in terms of corrosion resistance in marine environments?: In marine environments, special steel, also known as stainless steel, exhibits exceptional performance in terms of resisting corrosion. This is mainly attributed to the high levels of chromium and nickel present in its alloy composition. The chromium content creates a protective oxide layer on the steel's surface, commonly referred to as the passive layer. Acting as a shield, this layer prevents direct contact between the steel and corrosive elements found in marine environments, such as saltwater. Furthermore, the presence of nickel enhances the corrosion resistance of special steel. Nickel not only improves the stability of the passive layer but also increases its ability to self-repair if it becomes damaged. This property makes special steel highly reliable and long-lasting, especially in marine environments where the steel is exposed to saltwater, high humidity, and fluctuating temperatures that can accelerate corrosion processes. Moreover, special steel offers excellent resistance to two common types of corrosion encountered in marine environments: pitting corrosion and crevice corrosion. Pitting corrosion occurs when localized areas of the steel's surface are attacked, resulting in small pits or holes. Crevice corrosion, on the other hand, takes place in confined spaces such as gaps or joints, where stagnant water or debris can accumulate and expedite corrosion. By effectively resisting these types of corrosion, special steel ensures its durability and integrity in marine applications. Overall, the high chromium and nickel content of special steel contribute to its outstanding corrosion resistance in marine environments. Its ability to form a protective passive layer, resist pitting and crevice corrosion, and self-repair makes it the preferred choice for various marine applications, including shipbuilding, offshore structures, and seawater desalination plants.

Q: What are the main factors affecting the hardness of special steel?: The hardness of special steel is influenced by various factors. Let's explore some of the key ones: 1. Carbon content plays a vital role in determining the hardness of steel. The addition of carbon, known as a hardening element, enhances the strength and hardness. Generally, higher carbon content leads to increased hardness. 2. The presence of alloying elements like chromium, manganese, nickel, and tungsten also impacts the hardness of special steel. These elements interact with the steel, forming compounds and solid solutions that enhance hardness and strength. 3. The hardness of steel is significantly affected by the heat treatment process. This involves subjecting the steel to specific heating and cooling cycles. Quenching, a rapid cooling process, transforms the microstructure of the steel, resulting in increased hardness. On the other hand, tempering reduces hardness while improving toughness. 4. The crystal structure of the steel can also influence its hardness. For instance, during quenching, the formation of martensite, a hard and brittle structure, increases hardness. Alternatively, crystal structures like ferrite or pearlite may exhibit lower hardness. 5. The size of grains within the steel's microstructure can impact its hardness. Smaller grain sizes generally lead to higher hardness due to improved strength and limited dislocation movement within the material. 6. Work hardening, which occurs through processes like rolling or forging, can increase the hardness of steel. This phenomenon happens when dislocations in the crystal lattice become trapped and hinder further dislocation movement, resulting in increased hardness. 7. The presence of impurities or non-metallic inclusions in steel can affect its hardness. These impurities can act as stress concentrators, reducing the material's hardness. To achieve the desired hardness for specific applications, it is crucial to consider and carefully control these factors during the manufacturing process of special steel.

Q: What are the different material selection factors for special steel?: To ensure the desired performance, durability, and cost-effectiveness of the final product, engineers and designers must consider various factors when selecting materials for special steel. Key factors include mechanical properties, corrosion resistance, heat resistance, machinability, weldability, cost, availability, and environmental impact. 1. Mechanical Properties: Special steel must possess the necessary mechanical properties to meet the demands of the specific application. This includes strength, hardness, toughness, fatigue resistance, and wear resistance. 2. Corrosion Resistance: Depending on the intended use, special steel may need to have high corrosion resistance to withstand harsh environments, chemicals, or moisture. This ensures the longevity and reliability of the steel in its intended application. 3. Heat Resistance: Special steel may need to exhibit excellent heat resistance, especially for applications involving high temperatures like aerospace or power generation industries. The material should retain its strength and structural integrity even at elevated temperatures. 4. Machinability: The ease of machining special steel is crucial, especially for applications involving complex shapes or precision components. High machinability allows for efficient manufacturing processes and reduces production costs. 5. Weldability: Special steel selected for applications requiring welding should have good weldability. This ensures that the material can be easily welded without compromising strength or introducing defects. 6. Cost: The cost of the material plays a significant role in material selection. Engineers and designers must balance desired properties with the available budget to achieve optimal cost-effectiveness. 7. Availability: Ensuring a reliable and consistent supply of the chosen special steel is vital to avoid production delays or interruptions. 8. Environmental Impact: The environmental impact of the material should be evaluated, considering factors such as energy consumption during production, recyclability, and the use of sustainable raw materials. Opting for eco-friendly materials aligns with sustainable practices and regulations. By carefully considering these material selection factors, engineers and designers can choose the most suitable special steel for their specific application, ensuring optimal performance, durability, and cost-efficiency.

Q: How does special steel perform in erosion applications?: Special steel performs exceptionally well in erosion applications due to its high resistance to wear and corrosion. Its unique composition and enhanced durability make it an ideal choice for environments where erosion is a common concern. Special steel's ability to withstand abrasive forces and maintain its structural integrity over time ensures long-lasting performance and minimizes the need for frequent replacements or repairs.

Q: How does special steel contribute to the packaging aftermarket industry?: Special steel plays a significant role in the packaging aftermarket industry by offering various benefits that contribute to the overall efficiency and quality of packaging processes. Firstly, special steel is known for its exceptional strength and durability, which makes it ideal for manufacturing packaging machinery and equipment. This robustness ensures that the machinery can withstand the rigorous demands of the industry, leading to increased reliability and reduced downtime. Additionally, special steel possesses excellent corrosion resistance properties, making it highly suitable for packaging applications that involve exposure to moisture, chemicals, or extreme temperatures. This resistance to corrosion helps to extend the lifespan of packaging equipment and prevents degradation, ultimately reducing maintenance costs and enhancing the overall efficiency of the packaging aftermarket industry. Moreover, special steel can be tailored to meet specific requirements, allowing for the production of customized packaging solutions. This flexibility and versatility enable manufacturers to create innovative designs that enhance product protection, optimize space utilization, and improve transportation logistics. For instance, special steel can be utilized to create lightweight yet sturdy packaging materials, reducing shipping costs and minimizing the environmental impact associated with packaging waste. Furthermore, special steel possesses excellent machinability and weldability, facilitating the fabrication of intricate packaging components with high precision. This capability enables manufacturers to produce packaging solutions that are tailored to specific product dimensions, ensuring a perfect fit and optimal protection during transit. In conclusion, special steel plays a crucial role in the packaging aftermarket industry by offering strength, durability, corrosion resistance, customization options, and excellent machinability. These qualities contribute to the overall efficiency, reliability, and quality of packaging processes, ultimately benefiting both manufacturers and consumers.

Q: How does special steel contribute to the manufacturing of gears?: Special steel plays a crucial role in the manufacturing of gears due to its unique properties and characteristics. Gears are mechanical devices that facilitate the transmission of power and motion between rotating shafts, and they need to withstand high loads, operate at high speeds, and maintain precise dimensions for smooth and efficient functioning. Special steel, with its enhanced mechanical properties and superior quality, provides the necessary strength, durability, and wear resistance required for gear manufacturing. One key aspect of special steel is its high strength and hardness. Gears often experience heavy loads and undergo significant stress during operation. Special steel, such as alloy steel or tool steel, offers exceptional strength, allowing gears to handle these loads without deformation or failure. Moreover, the hardness of special steel ensures that gears can withstand abrasive wear and prevent damage caused by external factors, such as friction and contact with other components. Special steel also contributes to the manufacturing of gears by providing excellent fatigue resistance. Gears are subject to repetitive cyclic loading, which can lead to fatigue failure over time if not properly designed and manufactured. Special steel, through its unique microstructure and composition, enhances the fatigue life of gears by minimizing the propagation of cracks and reducing the risk of failure, ensuring long-term reliability and performance. Furthermore, special steel offers excellent machinability and dimensional stability, two vital factors in gear manufacturing. The machinability of special steel allows for precise shaping and cutting of gear teeth, ensuring accurate dimensions and smooth gear operation. The dimensional stability of special steel helps maintain the gear's shape and integrity under various temperature and environmental conditions, ensuring the gear's performance remains consistent throughout its lifespan. In conclusion, special steel plays a significant role in the manufacturing of gears by providing the necessary strength, durability, wear resistance, fatigue resistance, machinability, and dimensional stability. Gears made from special steel can withstand high loads, operate at high speeds, and maintain precise dimensions, ultimately contributing to the efficient functioning of various machinery and mechanical systems.

Q: How does special steel contribute to the manufacturing of cutting tools?: Special steel is a key component in the manufacturing of cutting tools due to its exceptional properties such as high hardness, toughness, and wear resistance. These characteristics enable cutting tools to withstand the rigors of various cutting operations, ensuring longer tool life and improved cutting performance. Furthermore, special steel can be customized to meet specific requirements, making it an ideal choice for manufacturing cutting tools that are used in a wide range of industries, including automotive, aerospace, and manufacturing.

Q: What are the common challenges in forging special steel?: Forging special steel poses several common challenges that manufacturers and engineers must address in order to achieve desired outcomes. One of the primary challenges in forging special steel is maintaining precise temperature control throughout the process. Special steels often have specific heat treatment requirements, and any deviation from the recommended temperature range can adversely affect the final properties of the material. Achieving and sustaining the right temperature is crucial to ensure desired mechanical properties like strength, hardness, and toughness. Another challenge in forging special steel is controlling the cooling rate during quenching. Quenching is a critical step in the heat treatment process that helps to achieve the desired hardness and strength in special steels. However, rapid cooling can lead to the formation of undesirable microstructures or even cracking. Therefore, carefully managing the cooling rate is essential to avoid these issues and ensure optimal material properties. Additionally, shaping special steels through forging can be challenging due to their high strength and hardness. These materials are often more difficult to deform compared to regular steels, requiring higher forging pressures and specialized equipment. The resistance to deformation can lead to increased wear on the forging dies, requiring frequent maintenance and replacement. Furthermore, special steels may contain alloying elements that can affect their forgeability. Some alloying elements can promote grain growth, which can reduce the mechanical properties of the material. Finding the right balance of alloying elements and optimizing the forging process parameters is crucial to achieve the desired microstructure and properties in the final product. Lastly, ensuring consistency and repeatability in the forging process can be a challenge. Special steels are often produced in smaller quantities or for specific applications, making it important to maintain process control and quality assurance. Proper documentation, monitoring, and quality control measures need to be implemented to ensure that the forged special steel meets the desired specifications and performance requirements. Overall, forging special steel requires careful attention to temperature control, cooling rate during quenching, shaping difficulties, alloying elements, and maintaining consistency. Addressing these challenges through proper process control and optimization is crucial to obtain high-quality special steel products with the desired mechanical properties and performance characteristics.

Q: How does special steel contribute to the manufacturing of hydraulic components?: Special steel plays a crucial role in the manufacturing of hydraulic components due to its unique properties and characteristics. Hydraulic components, such as cylinders, pumps, valves, and fittings, work under high pressure and extreme conditions. Therefore, they require materials that can withstand these demanding environments. Special steel, also known as alloy steel, is specifically designed to possess exceptional strength, durability, and resistance to corrosion and wear. These properties make it an ideal material for hydraulic components, as they need to withstand high pressures, constant movement, and exposure to various fluids. The high strength of special steel allows hydraulic components to handle heavy loads and resist deformation, ensuring their long-term reliability and performance. Additionally, the durability of special steel ensures that hydraulic components can endure the continuous stress and movement without experiencing premature failures. Another significant advantage of special steel is its resistance to corrosion and wear. Hydraulic components often come into contact with different fluids, including water, oil, and chemicals. Special steel's resistance to corrosion protects the components from degradation and extends their lifespan. Furthermore, its resistance to wear minimizes the damage caused by friction, ensuring smooth operation and reducing maintenance requirements. Moreover, special steel can be easily machined and formed into complex shapes, allowing for the production of intricate hydraulic components with precise specifications. This versatility enables manufacturers to create components that are tailored to the specific requirements of different hydraulic systems, ensuring optimal performance and efficiency. In conclusion, special steel contributes significantly to the manufacturing of hydraulic components by providing the necessary strength, durability, corrosion resistance, and wear resistance. Its unique properties enable the production of high-quality and reliable hydraulic components that can withstand demanding environments and ensure the smooth operation of hydraulic systems.

Q: What are the different methods for tempering special steel?: There are different methods available for tempering special steel, each having its own advantages and considerations. Some commonly used methods for tempering special steel are: 1. Air Tempering: Special steel is heated to a specific temperature and allowed to cool in still air. This method is suitable for low alloy steels and results in uniform hardness throughout the steel. 2. Oil Tempering: Special steel is heated to a specific temperature and then rapidly cooled by quenching it in oil. This method is commonly used for tool steels as it provides a good balance between hardness and toughness. 3. Water Tempering: Similar to oil tempering, this method involves quenching the steel in water after heating it to a specific temperature. It leads to a harder steel due to faster cooling, but it may also increase brittleness. 4. Salt Bath Tempering: The steel is immersed in a molten salt bath at a specific temperature. This method ensures controlled and uniform heat transfer, resulting in consistent hardness throughout the steel. 5. Cryogenic Tempering: Steel is cooled to extremely low temperatures, often below -100°C (-148°F), using liquid nitrogen or helium. This method further reduces residual stresses and enhances wear resistance of the steel. It is important to consider various factors such as the type of steel, desired hardness, intended application, and the required balance between hardness and toughness when choosing a specific tempering method for special steel. Following proper heat treatment guidelines and seeking advice from experts is crucial to achieve optimal results for a particular steel alloy.

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