Special Steel Round Bar AISI 4140 Alloy Steel

Special Steel Round Bar AISI 4140 Alloy Steel System 1

Special Steel Round Bar AISI 4140 Alloy Steel

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 10000 m.t./month

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Special Steel Round Bar AISI 4140 Alloy Steel

1.4140/1.7225/42CrMo4/SCM440/EN19
2.good price and fast delivery time
3.large stocks

‍Equivalent grades

GB	DIN	AISI	JIS
42CrMo	1.7225	4140	SCM440

Chemical Composition

C	Si	Mn	Cr	Mo	P	S
0.38-0.43	0.40max	0.60-0.90	0.90-1.20	0.15-0.30	≤0.035	≤0.035

Available size

Round steel bar 10-800mm
Flat steel bar 25-400mm*200-800mm

Surface condition

Black surface/ Grinded/ Machined

Black surface/ Grinded/ Machined

Hardness

Annealed HBS 217 max

Annealed HBS 217 max

Characteristics

4140 Alloy Steel/SAE 4140 Steel Price is engineering steel supplied in quenched and tempered conditions. Very good machinability. High toughness. High creep strength. Repeated impact resistant capability.

4140 Alloy Steel/SAE 4140 Steel Price is engineering steel supplied in quenched and tempered conditions. Very good machinability. High toughness. High creep strength. Repeated impact resistant capability.

Applications

4140 Alloy Steel/SAE 4140 Steel Price is use to producecomponents with high requirements on toughness, e.g. gear wheels, pinions, connecting rods, parts for mechanical engineering .

4140 Alloy Steel/SAE 4140 Steel Price is use to producecomponents with high requirements on toughness, e.g. gear wheels, pinions, connecting rods, parts for mechanical engineering .

Heat treatment

Forging		Heat to 1150°C. Hold until uniform. Minimum forging temperature 850°C.Cool slowly in ashes or sand etc.
Annealing		Heat to 830°C-850°C.Cool in furnace.
Normalising		Heat to 870°C-900°C.Cool in still air.
Stress Relieving		Annealed: Heat to 600°C-650°C.Hardened: Heat to 500°C-550°C.Cool in still air.
Hardening		Heat to 830°C-880°C. Quench in oil or polymer.
Tempering		Heat to 450°C-700°C cool in still air. NB. Tempering within the range 200°C-420°C will result in temper brittleness and should be avoided.

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Special Steel Round Bar AISI 4140 Alloy Steel

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Q: How does special steel contribute to the transportation sector?: Special steel contributes to the transportation sector by providing high-strength and lightweight materials that enhance the performance, efficiency, and safety of vehicles. It is used in various components, such as engine parts, chassis, and suspension systems, to improve fuel economy, reduce emissions, and enhance durability. Additionally, special steel's corrosion resistance properties make it suitable for manufacturing components in harsh environments, such as marine and aerospace applications, further expanding its contribution to the transportation industry.

Q: What are the different electrical grades of special steel?: There are several electrical grades of special steel that are specifically designed to have superior electrical properties. These grades include: 1. Electrical Silicon Steel: This grade of special steel contains a high percentage of silicon, typically around 3-4%. The presence of silicon helps to minimize eddy current losses and improve the magnetic properties of the steel, making it ideal for use in electrical transformers and motors. 2. Electrical Stainless Steel: This grade of special steel is made from stainless steel alloys, which are known for their excellent corrosion resistance. The electrical stainless steel has a low electrical resistivity and high thermal conductivity, making it suitable for electrical connectors, terminals, and other components that require good electrical conductivity and resistance to oxidation. 3. Electrical Tool Steel: Tool steels are commonly used in the manufacturing of various tools and dies. Some tool steels are specifically formulated to have improved electrical properties, including high electrical conductivity and resistance to heat. These grades are often used in the production of electrical contacts, switches, and other electrical components that require high wear resistance and good electrical performance. 4. Electrical Copper-Clad Steel: This grade of special steel is made by bonding a layer of copper to a steel core. The copper layer provides excellent electrical conductivity, while the steel core provides strength and durability. Electrical copper-clad steel is commonly used in applications where high electrical conductivity is required, such as in power transmission lines and grounding systems. Overall, the different electrical grades of special steel offer a range of electrical properties to meet the specific needs of various electrical applications. These grades are carefully engineered to provide optimal electrical performance, durability, and resistance to corrosion and wear.

Q: Can special steel be used for making defense industry components?: Indeed, the utilization of special steel in the production of defense industry components is possible. Special steel pertains to a classification of steel that has been deliberately designed and engineered to possess superior attributes and qualities when compared to standard steel grades. These attributes comprise high strength, exceptional toughness, resistance to corrosion, heat resistance, and wear resistance. Within defense industries, the materials utilized for components like armor plates, military vehicles, weapons systems, aircraft structures, and naval vessels must be able to endure extreme conditions while delivering optimal performance. Special steel, with its extraordinary attributes, fulfills these requirements and is frequently employed in the manufacturing of defense industry components. For instance, armor plates employed in military vehicles and personal body armor are commonly constructed from special steel alloys that can withstand ballistic impacts and safeguard personnel. Similarly, aircraft structures and naval vessels necessitate steel that can endure high stresses, corrosion caused by saltwater, and extreme temperatures, all of which can be accomplished through the use of special steel. Furthermore, the ease with which special steel can be machined, welded, and fabricated also contributes to its application in the production of defense industry components. This facilitates efficient production and assembly of intricate defense equipment. Overall, special steel is an essential material within the defense industry as it presents exceptional strength, durability, and performance attributes, rendering it an ideal selection for the production of defense components that must withstand rigorous and demanding conditions.

Q: How does special steel contribute to the manufacturing of precision components?: Special steel plays a crucial role in the manufacturing of precision components by offering superior strength, durability, and resistance to wear and corrosion. Its unique properties allow for the production of complex and intricate parts that require high levels of precision and accuracy. Additionally, special steel often exhibits excellent machinability, enabling manufacturers to achieve tight tolerances and fine finishes. Overall, special steel enhances the performance and reliability of precision components, making it an essential material in the manufacturing industry.

Q: What are the different methods for improving the impact resistance of special steel?: There are several methods available for improving the impact resistance of special steel. These methods can be broadly categorized into heat treatment, alloying, and surface treatments. 1. Heat Treatment: One of the most common methods for improving impact resistance is heat treatment. This involves subjecting the steel to controlled heating and cooling processes to alter its microstructure. The two main heat treatment processes used for improving impact resistance are tempering and quenching. Tempering involves heating the steel to a specific temperature and then cooling it slowly. This process helps to relieve internal stresses and improve toughness. Quenching, on the other hand, involves rapidly cooling the steel after heating it to a high temperature. This process results in a hardened microstructure, enhancing the impact resistance. 2. Alloying: Another method for improving the impact resistance of special steel is through alloying. By adding certain elements to the base steel, the properties can be enhanced. For example, adding elements such as manganese, nickel, or chromium can improve the toughness and impact resistance of the steel. These alloying elements alter the steel's microstructure, resulting in increased strength and resistance to deformation. 3. Surface Treatments: Surface treatments are used to improve the impact resistance of special steel by providing a protective layer on the surface. One commonly used surface treatment is case hardening, which involves introducing carbon or nitrogen into the surface layer of the steel. This process creates a hard outer layer while retaining a tough core, enhancing the impact resistance. Another surface treatment method is shot peening, which involves bombarding the steel surface with small metal or ceramic particles under high pressure. This process induces compressive stresses in the surface layer, improving the fatigue resistance and impact resistance of the steel. In conclusion, the different methods for improving the impact resistance of special steel include heat treatment, alloying, and surface treatments. These methods can be employed individually or in combination to enhance the mechanical properties of the steel, making it more resistant to impact and deformation.

Q: What are the requirements for special steel used in industrial equipment manufacturing?: To ensure the suitability of special steel for use in demanding applications in industrial equipment manufacturing, certain requirements must be met. These requirements include: 1. Exceptional strength: Given the heavy loads that industrial equipment often encounters, special steel must possess superior strength properties to withstand these forces. It should exhibit high levels of yield strength, tensile strength, and hardness to prevent deformation or failure. 2. Resistance to corrosion: Industrial environments are frequently subject to corrosion caused by exposure to chemicals, moisture, or extreme temperature fluctuations. Therefore, special steel used in such applications should possess excellent corrosion resistance to prevent degradation and ensure long-term performance. 3. High resistance to wear: The friction, abrasion, and impact experienced by industrial equipment often lead to significant wear. Consequently, special steel needs to exhibit exceptional wear resistance to maintain its integrity and prevent premature failure. 4. Toughness and resistance to impact: Industrial settings can subject equipment to sudden shocks, impacts, or vibrations. To withstand such events, special steel should demonstrate good toughness and resistance to impact, absorbing energy and resisting fracture or cracking. 5. Ability to withstand high temperatures: Certain industrial processes expose equipment to high temperatures or rapid temperature changes. Special steel must exhibit excellent heat resistance, retaining its strength, hardness, and other mechanical properties even at elevated temperatures. 6. Ease of machining: Special steel used in industrial equipment manufacturing should be easy to machine, facilitating the fabrication process. It should allow for simple cutting, drilling, welding, and other machining operations without excessive tool wear or damage to the material. 7. Dimensional stability: Equipment components must maintain their shape and dimensions under various operating conditions. Special steel needs to exhibit dimensional stability to prevent warping, distortion, or dimensional changes that could impact the performance or assembly of the equipment. By meeting these requirements, special steel used in industrial equipment manufacturing can endure harsh conditions, deliver reliable performance, and have a long service life. Ultimately, this contributes to the overall efficiency and productivity of industrial processes.

Q: How does special steel contribute to the elasticity of products?: Special steel contributes to the elasticity of products by providing a high level of tensile strength and flexibility. Its unique composition and manufacturing process allow it to withstand stress and deformation without breaking, allowing products to return to their original shape after being bent or stretched. This characteristic is crucial in various industries, such as automotive, aerospace, and construction, where the elasticity of products is essential for safety, durability, and performance.

Q: Can special steel be used in the production of kitchen utensils?: Yes, special steel can be used in the production of kitchen utensils. Special steel, such as stainless steel, offers excellent durability, corrosion resistance, and hygiene, making it a popular choice for kitchen utensils. It can withstand high temperatures, resist staining, and is easy to clean, making it suitable for various cooking and food preparation tasks.

Q: What are the properties of corrosion-resistant stainless tool steel?: Corrosion-resistant stainless tool steel possesses a number of key properties. Firstly, it exhibits excellent resistance to corrosion, making it highly durable and suitable for use in corrosive environments. It also has high strength and hardness, ensuring its effectiveness as a tool material. Additionally, this type of steel offers good wear resistance, enabling it to withstand repeated use without significant deterioration. Moreover, it retains its sharpness and cutting edge for extended periods, making it an ideal choice for various cutting and machining applications. Overall, the properties of corrosion-resistant stainless tool steel make it a reliable and long-lasting option for demanding industrial and manufacturing settings.

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.

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