Hot Rolled 5140 Steel, 5140 Steel Structure, 5140 Steel Plate

Hot Rolled 5140 Steel, 5140 Steel Structure, 5140 Steel Plate System 1

Hot Rolled 5140 Steel, 5140 Steel Structure, 5140 Steel Plate

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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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Hot Rolled 5140 Steel, 5140 Steel Structure, 5140 Steel Plate

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 60-800mm
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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Hot Rolled 5140 Steel, 5140 Steel Structure, 5140 Steel Plate

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Q: How does special steel contribute to reducing product waste?: Special steel contributes to reducing product waste in several ways. Firstly, it is known for its durability and strength, which means that products made from special steel have a longer lifespan and are less likely to break or wear out quickly. This reduces the need for frequent replacements, thereby minimizing product waste. Additionally, special steel can be fabricated into complex shapes and sizes, allowing manufacturers to optimize material usage and minimize waste during production. The ability to customize special steel to specific requirements also ensures that products are designed with the right dimensions and strength, reducing the chances of defects or inefficiencies that could lead to waste. Moreover, special steel often has superior corrosion resistance and other protective properties, making it suitable for applications where products are exposed to harsh environments or frequent use. This reduces the likelihood of premature degradation or damage, further extending the product's lifespan and reducing waste. Overall, special steel's durability, customization capabilities, and protective properties play a significant role in reducing product waste by increasing product longevity, optimizing material usage, and minimizing defects or damage.

Q: How does special steel contribute to reducing product failure?: Special steel contributes to reducing product failure by providing enhanced mechanical properties and superior resistance to wear, corrosion, and fatigue. Its exceptional strength, toughness, and durability allow for the production of components that can withstand high stress, extreme temperatures, and harsh environments, minimizing the risk of failure. Additionally, special steel's precise composition and controlled manufacturing processes ensure consistent quality and reliability, reducing the likelihood of defects or weaknesses that could lead to product failure.

Q: How is mold steel used in the production of plastic injection molds?: Mold steel is used in the production of plastic injection molds due to its high strength, wear resistance, and ability to withstand high temperatures. It is used to create the core and cavity of the mold, which are crucial components that shape the plastic parts. Mold steel ensures precise and accurate molding, prolongs the mold's lifespan, and enables the production of high-quality plastic products in a cost-effective manner.

Q: What is the maximum temperature that special steel can withstand?: The maximum temperature that special steel can withstand depends on the specific type of steel being used. Special steels are designed to have enhanced properties, such as high heat resistance, which allows them to withstand higher temperatures than standard steels. For example, some special steels, such as heat-resistant stainless steels, can withstand temperatures up to around 1200 degrees Celsius (2200 degrees Fahrenheit). These steels are often used in applications where high temperatures are encountered, such as in furnaces, boilers, and exhaust systems. Other types of special steels, such as tool steels or high-speed steels, may have different maximum temperature limits. These steels are commonly used in cutting tools, molds, and machining applications, where they need to maintain their hardness and strength at elevated temperatures. It is important to note that the maximum temperature that special steel can withstand also depends on factors such as the duration of exposure to the high temperature, the specific alloy composition, and any additional heat treatment processes that have been applied. Therefore, it is crucial to consult the manufacturer's specifications or seek professional advice for accurate information on the maximum temperature limit for a particular type of special steel.

Q: What are the different methods of improving the wear resistance of special steel?: To improve the wear resistance of special steel, there are various techniques that can be employed. To start, heat treatment methods like quenching and tempering can be utilized. Quenching involves rapidly cooling the steel in a liquid medium, such as oil or water, to enhance its hardness. This process forms a hardened surface layer that can effectively resist wear. On the other hand, tempering involves reheating the quenched steel to a specific temperature and gradually cooling it. This helps reduce the brittleness caused by quenching and improves the steel's toughness, which is crucial for wear resistance. Another approach is through alloying. By adding elements like chromium, manganese, or vanadium to the steel, its wear resistance can be significantly enhanced. These alloying elements form carbides, nitrides, or borides, which increase the hardness and improve the material's ability to resist wear and abrasion. Surface treatment techniques, such as carburizing or nitriding, can also be employed. Carburizing involves heating the steel in a carbon-rich atmosphere, introducing carbon into its surface. This creates a hardened surface layer with a high carbon content, making the steel more wear-resistant. Nitriding, on the other hand, involves diffusing nitrogen into the steel's surface, forming nitrides that increase hardness and wear resistance. Furthermore, the steel surface can be coated using physical vapor deposition (PVD) or chemical vapor deposition (CVD). PVD involves depositing a thin layer of wear-resistant material, like titanium nitride or diamond-like carbon, onto the steel surface using a vacuum process. CVD, on the other hand, involves depositing a wear-resistant coating through chemical reactions at elevated temperatures. These coatings provide an additional layer of protection against wear and friction. Lastly, the grain size of the steel can be controlled through processes like grain refinement or severe plastic deformation. Smaller grain sizes typically result in increased hardness and improved wear resistance. Overall, a combination of these methods can be employed to enhance the wear resistance of special steel, depending on the specific application and desired properties.

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: What are the main characteristics of creep-resistant steel forgings?: Creep-resistant steel forgings possess a range of essential qualities that render them suitable for applications involving high temperatures and prolonged stress and heat exposure. To begin with, these forgings are renowned for their exceptional resistance to creep deformation. Creep refers to the gradual deformation that occurs under constant load and elevated temperatures over an extended period. These forgings are specifically designed to withstand such deformation, retaining their shape and structural integrity. Consequently, they are ideal for use in environments with high temperatures, such as turbine blades, boiler components, and other similar settings. Another crucial characteristic of creep-resistant steel forgings is their impressive strength. These forgings are manufactured using alloying elements like chromium, molybdenum, and vanadium, which enhance their tensile strength. As a result, they exhibit excellent resistance to deformation and fracture under high-stress conditions. This strength is essential for ensuring that the forgings can endure the demands of various applications and perform reliably over time. Furthermore, creep-resistant steel forgings demonstrate good resistance to oxidation and corrosion. The presence of alloying elements creates a protective layer on the surface, safeguarding against oxidation and corrosion at elevated temperatures. This resistance is vital in preventing the degradation of the material and maintaining its mechanical properties, even in harsh environments. Moreover, creep-resistant steel forgings offer outstanding thermal stability. They can endure extreme temperature fluctuations without significant dimensional changes or loss of mechanical strength. This stability is particularly critical in applications that involve rapid heating and cooling cycles, ensuring that the forgings can sustain their performance under challenging conditions. Additionally, creep-resistant steel forgings possess excellent fatigue resistance. Fatigue refers to the weakening of a material resulting from cyclic loading, which is particularly relevant in high-temperature applications due to the combination of stress and heat. These forgings are designed to withstand cyclic loading and retain their mechanical properties, thus reducing the risk of fatigue failure and enhancing the overall reliability of the component. In conclusion, the primary characteristics of creep-resistant steel forgings encompass resistance to creep deformation, high strength, good oxidation and corrosion resistance, thermal stability, and excellent fatigue resistance. These qualities establish creep-resistant steel forgings as a reliable and durable choice for applications requiring resistance to high temperatures, stress, and prolonged exposure to challenging environments.

Q: What are the main factors affecting the corrosion fatigue strength of special steel?: Several factors affect the corrosion fatigue strength of special steel. Firstly, the composition of the steel is crucial. Special steels typically contain various alloying elements like chromium, nickel, molybdenum, and copper, which enhance their corrosion resistance. The presence and quantity of these elements significantly impact the corrosion fatigue strength. Generally, higher levels of alloying elements improve resistance to corrosion fatigue. Secondly, the surface condition of the steel is important. Any surface defects such as scratches, pits, or roughness can act as stress concentrators and accelerate the initiation and propagation of corrosion fatigue cracks. Additionally, the presence of surface contaminants like dirt, grease, or salts can increase the corrosive environment and reduce the corrosion fatigue strength. Thirdly, the environmental conditions in which the steel is exposed play a significant role. Corrosion fatigue occurs due to the combined action of cyclic loading and a corrosive environment. Factors like temperature, humidity, pH, and the presence of corrosive substances such as saltwater or chemicals can accelerate the corrosion process and reduce the fatigue strength. Furthermore, the mechanical properties of the steel, such as hardness, strength, and ductility, also influence its corrosion fatigue strength. Higher strength and hardness enhance resistance to fatigue crack initiation, while greater ductility improves resistance to crack propagation. However, excessive hardness or brittleness can decrease corrosion fatigue strength. Lastly, the design and manufacturing processes of components made from special steel can impact their corrosion fatigue strength. Factors such as welding techniques, heat treatment, and surface finishing can introduce residual stresses or alter the microstructure of the steel, affecting its corrosion fatigue behavior. In conclusion, the corrosion fatigue strength of special steel is influenced by its composition, surface condition, environmental conditions, mechanical properties, and manufacturing processes. Understanding and appropriately addressing these factors are crucial for enhancing the corrosion fatigue resistance of special steel components.

Q: What are the challenges in welding special steel alloys?: The challenges in welding special steel alloys include their high carbon content, which can result in increased hardness and potential cracking during the welding process. Additionally, these alloys often have a higher melting point, requiring specialized equipment and techniques for proper fusion. The presence of alloying elements can also lead to increased heat input and distortion, necessitating careful control of welding parameters. Lastly, the potential for intermetallic phase formation and reduced corrosion resistance in these alloys poses additional challenges in achieving strong and durable welds.

Q: What are the requirements for special steel used in nuclear power plants?: The requirements for special steel used in nuclear power plants are extremely stringent and critical for ensuring the safe and reliable operation of these facilities. Some of the key requirements include: 1. High strength and durability: Special steel used in nuclear power plants must possess exceptional strength and durability to withstand the extreme conditions and stresses, such as high temperatures, pressure, and radiation levels. 2. Resistance to corrosion: Corrosion can severely compromise the integrity of steel components in a nuclear power plant. Therefore, special steel must exhibit high resistance to corrosion, including resistance to both general and localized corrosion, such as pitting and crevice corrosion. 3. Low neutron absorption: Neutron absorption is a crucial factor in nuclear power plants as it can influence the performance of reactor core materials. Special steel used in nuclear applications should have low neutron absorption characteristics to minimize interference with neutron flux and avoid any adverse effects on the overall operation and safety of the plant. 4. Radiation resistance: Nuclear power plants generate significant levels of radiation, which can affect the properties and performance of materials over time. Special steel must be able to withstand the effects of radiation-induced embrittlement, degradation, and other forms of radiation damage, ensuring long-term mechanical integrity. 5. Regulatory compliance: The steel used in nuclear power plants must meet stringent regulatory standards and codes, such as those set forth by the Nuclear Regulatory Commission (NRC) in the United States or the International Atomic Energy Agency (IAEA) internationally. Compliance with these regulations ensures that the steel meets the necessary safety criteria and has been manufactured and tested to the highest standards. 6. Traceability and documentation: The traceability of special steel used in nuclear power plants is crucial. It is essential to maintain a comprehensive documentation trail, including material certifications, test reports, and manufacturing records, to ensure that the steel's quality and provenance can be verified throughout its lifecycle. Overall, the requirements for special steel used in nuclear power plants revolve around its ability to withstand extreme conditions, resist corrosion and radiation, comply with stringent regulatory standards, and provide long-term structural integrity. These requirements are vital to ensuring the safe and efficient operation of nuclear power plants and the protection of human health and the environment.

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