SCM440 Alloy Steel Bar Hot-Rolled Bar
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25 m.t.
- Supply Capability:
- 500000 m.t./month
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Specification
Type:
Alloy Steel
Shape:
Steel Round Bar
SCM440 Alloy Steel Bar Hot-Rolled Bar
Product Description:
1. Commodity: Round steel bar
3. Technical: Hot rolling
2. Length: Min. 5.8meter, according to requirement.
3. Diameter: 16mm-250mm
5. Packing: In Bundle or according to your requirements.
4. Standard: GB/T 3077-1999(42CrMo) ; JIS SCM440; DIN 42CrMo4 ; ASTM 4140 ; BS 708M40
Chemical Composition(%):
C | Si | Mn | Cr | Mo | Ni | P | S |
0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.20 | 0.15-0.25 | ≤0.030 | ≤0.030 | ≤0.030 |
Standard:
GB | AISI | DIN | JIS | ISO |
42CrMo | 4140 | 42CrMo4 | SCM440 | 42CrMo4 |
Available Size:
Rolled round bar | φ20-120mm × L |
Forged round bar | φ130-195mm × L |
Application:used for various large-size or medium-size precision plastic mould and low melting
point alloy parts
The steel with high strength and toughness, hardenability is better also | |||||||
After conditioning treatment quenching deformation of small | |||||||
high fatigue limit and repeated impact resistance |
Quality Certificate:we can supply quality certificate
Packaging:standard seaworthy packing or as customer require
Delivery: In 7-10 days after we receive 30% deposite
Product show:
- Q: What are the different case hardening grades of special steel?
- Special steel offers a variety of case hardening grades, each with its own distinct properties and uses. Some of the commonly employed grades are: 1. 8620: This grade is commonly utilized for high-stress applications like gears and shafts. Its remarkable toughness and resistance to wear make it ideal for parts requiring both durability and strength. 2. 9310: Aerospace applications often rely on this grade due to its high strength and resistance to fatigue. It is frequently employed for gears, bearings, and components demanding exceptional toughness and load-carrying capacity. 3. 4340: Known for its hardenability and high strength, this grade is suitable for parts necessitating great tensile strength and impact resistance, such as crankshafts, connecting rods, and gears. 4. 20MnCr5: This grade finds frequent use in the production of gears, camshafts, and components requiring high surface hardness and resistance to wear. It boasts excellent case-hardening properties and good core strength. 5. EN36C (also referred to as 655M13): This grade is commonly employed for axles, shafts, and crankshafts requiring high tensile strength. Its good hardenability and exceptional toughness make it suitable for heavy-duty applications. To ensure the right grade is chosen for a specific project, it is crucial to consider the application requirements, including desired hardness, strength, and wear resistance. Seeking advice from a metallurgist or materials science expert can aid in selecting the appropriate case hardening grade.
- Q: What are the non-destructive testing methods used for special steel?
- Some of the non-destructive testing methods used for special steel include ultrasonic testing, magnetic particle testing, liquid penetrant testing, and radiographic testing. These methods allow for the detection of defects, cracks, or other imperfections in the steel without causing any damage to the material itself.
- Q: Can special steel be used in marine environments?
- Indeed, marine environments can benefit from the utilization of special steel. Specifically engineered to endure the harsh conditions prevalent in marine settings, special steel, such as stainless steel or marine-grade steel, proves its worth. These environments typically expose materials to saltwater, which possesses a highly corrosive nature. Nonetheless, special steel's resistance to corrosion remains intact due to its elevated levels of chromium and other alloying elements. Consequently, it becomes exceedingly suitable for an array of marine applications, encompassing shipbuilding, offshore structures, and marine equipment. The reliability of special steel lies in its exceptional strength, durability, and corrosion resistance. Moreover, to further augment its resistance to corrosion, special steel can undergo additional treatment and coating, thereby guaranteeing its longevity and optimal performance in marine conditions.
- Q: How does special steel perform in high-temperature fatigue?
- Special steel is known for its exceptional performance in high-temperature fatigue conditions. When subjected to elevated temperatures, special steel exhibits properties such as high strength, excellent resistance to creep, and superior thermal stability. These characteristics make it highly reliable and capable of withstanding prolonged exposure to extreme temperatures without significant degradation in performance. One of the reasons for special steel's exceptional performance in high-temperature fatigue is its unique composition. It typically contains alloying elements such as chromium, molybdenum, and vanadium, which enhance its high-temperature strength and resistance to thermal fatigue. These alloying elements form stable carbides and nitrides that help retain the material's structural integrity even under extreme heat and cyclic loading. Furthermore, special steel undergoes specialized heat treatment processes, such as quenching and tempering, to further improve its high-temperature fatigue properties. These treatments enhance the material's microstructure, resulting in increased strength, toughness, and resistance to thermal fatigue. In high-temperature fatigue conditions, special steel demonstrates excellent fatigue strength and durability, even when subjected to cyclic loading at elevated temperatures. Its high-temperature fatigue limit is significantly higher than that of regular steel, allowing it to withstand repeated stress and strain without experiencing premature failure. This makes special steel an ideal choice for applications that involve high-temperature environments, such as gas turbines, heat exchangers, and aerospace components. In conclusion, special steel performs exceptionally well in high-temperature fatigue conditions due to its unique composition, specialized heat treatment processes, and superior mechanical properties. Its high strength, resistance to creep, and thermal stability make it a reliable and durable material for applications that require prolonged exposure to extreme temperatures.
- Q: What are the specific requirements for special steel used in the nuclear waste storage industry?
- The nuclear waste storage industry has stringent and critical requirements for special steel to guarantee the safety and long-term viability of storage facilities. These requirements are driven primarily by the need to mitigate risks associated with nuclear waste, such as radiation leakage and corrosion. One key requirement is the need for high strength and durability. Special steel used in nuclear waste storage must possess exceptional mechanical properties to withstand the weight and pressure exerted by waste containers and the surrounding environment. This includes resistance to deformation, fracture, and fatigue, as well as the ability to maintain structural integrity for an extended period. Another essential requirement is excellent corrosion resistance. Nuclear waste contains highly corrosive substances that can degrade regular steel over time. Therefore, special steel used in the nuclear waste storage industry must have enhanced corrosion resistance to ensure long-term durability and prevent leakage of radioactive materials. Furthermore, the steel must have a low susceptibility to stress corrosion cracking (SCC). SCC occurs when a combination of tensile stress, corrosive environment, and specific material conditions result in crack initiation and propagation. To maintain the integrity of containers and minimize the risk of leakage, the steel used must be highly resistant to SCC. Radiation resistance is also critical for special steel used in nuclear waste storage. The steel should exhibit minimal degradation or embrittlement when exposed to high levels of radiation. This is necessary to maintain the structural integrity of storage containers and prevent any weakening that could compromise waste containment. In addition, the special steel used in the nuclear waste storage industry must comply with strict regulatory standards and certifications. It must meet specific design codes and guidelines set by regulatory authorities to ensure compliance with safety regulations and minimize potential hazards. In conclusion, the special steel used in the nuclear waste storage industry must meet specific requirements, including high strength, durability, corrosion resistance, low susceptibility to stress corrosion cracking, radiation resistance, and compliance with regulatory standards. These requirements are essential for maintaining the safety and integrity of storage facilities and preventing any leakage or release of radioactive materials into the environment.
- Q: What are the requirements for special steel used in power plants?
- The requirements for special steel used in power plants are specific and stringent, given the critical role that these materials play in ensuring the safe and efficient operation of power generation facilities. Some of the key requirements for special steel in power plants include: 1. High temperature resistance: Special steel used in power plants must be able to withstand high temperatures without losing its structural integrity. This is crucial as power plants operate at elevated temperatures, especially in areas such as the combustion chamber or steam turbines. 2. Corrosion resistance: Power plants often operate in environments with high levels of moisture, chemicals, and other corrosive elements. Special steel must possess excellent corrosion resistance to prevent degradation and premature failure caused by chemical reactions or rusting. 3. Strength and toughness: As power plants generate significant amounts of energy, the components made of special steel must exhibit high strength and toughness to withstand the mechanical stresses and loads they are subjected to. This includes resistance to fatigue, creep, and stress corrosion cracking. 4. Weldability: Power plant components often require welding during fabrication or maintenance. Special steel should have good weldability to ensure strong and reliable joints that maintain the structural integrity of the overall system. 5. Low thermal expansion: Special steel used in power plants should have low thermal expansion properties to minimize the risk of thermal stress and distortion that can occur due to temperature variations during operation. This ensures dimensional stability and prevents premature failure. 6. Resistance to radiation: In some power plants, such as nuclear facilities, special steel may be exposed to radiation. Therefore, it is necessary for the steel to have good resistance to radiation damage, ensuring its long-term performance and safety. 7. Compliance with industry standards: Special steel used in power plants must meet specific industry standards and codes to ensure its quality, reliability, and safety. These may include standards such as ASTM, ASME, or ISO, among others. Overall, the requirements for special steel used in power plants are driven by the need for high temperature resistance, corrosion resistance, strength, weldability, low thermal expansion, radiation resistance, and compliance with industry standards. Meeting these requirements ensures the integrity and longevity of power plant components, contributing to the safe and efficient generation of electricity.
- Q: What are the different methods of heat treatment for special steel?
- Special steel can undergo various heat treatment methods, each designed to enhance specific properties. These methods are as follows: 1. Annealing: By heating the steel to a specific temperature and gradually cooling it, typically in a controlled atmosphere, annealing helps relieve internal stresses, improve machinability, and soften the steel for further processing. 2. Normalizing: This process involves heating the steel above its critical temperature and then air cooling it in still air. Normalizing refines the grain structure, improves mechanical properties, and enhances strength and toughness. 3. Quenching: By rapidly cooling the steel from a high temperature using quenching mediums like oil, water, or brine, quenching creates a hard and brittle structure called martensite. This increases the steel's hardness and wear resistance. 4. Tempering: After quenching, the steel is reheated to a specific temperature and held there for a certain period, followed by air cooling. Tempering reduces the brittleness caused by quenching, improving toughness, ductility, and impact resistance. 5. Austempering: This method involves quenching the steel from a high temperature and then holding it at a specific temperature for an extended period. Austempering produces a structure called bainite, which offers a combination of strength, toughness, and ductility. 6. Martempering: A variation of quenching, martempering involves cooling the steel just above its martensitic transformation range and holding it at that temperature until uniformly cooled. This method reduces the risk of distortion and cracking, providing improved toughness and dimensional stability. 7. Induction hardening: Specifically used to selectively harden certain areas of the steel's surface, induction hardening involves heating the surface using induction heating and rapidly quenching it. This process creates a hardened surface layer while maintaining core toughness and ductility. These diverse heat treatment methods for special steel offer a range of options to optimize desired properties depending on specific applications and requirements.
- Q: How does special steel perform in corrosive environments?
- Special steel is specifically designed to perform well in corrosive environments. It is made with a higher content of alloying elements such as chromium, which forms a protective oxide layer on the surface of the steel. This oxide layer acts as a barrier, preventing the steel from coming into direct contact with the corrosive elements in the environment. Additionally, special steel may also contain other alloying elements such as molybdenum, nickel, or copper, which further enhance its resistance to corrosion. These elements help to increase the steel's ability to withstand pitting, crevice corrosion, and stress corrosion cracking, which are common types of corrosion that occur in corrosive environments. Furthermore, special steel is often treated with various surface coatings or finishes that provide additional protection against corrosion. These coatings can include zinc, epoxy, or polymeric materials, which create an additional barrier between the steel and the corrosive elements. In summary, special steel performs exceptionally well in corrosive environments due to its high content of alloying elements, protective oxide layer, and additional surface coatings. It offers excellent resistance to various forms of corrosion and ensures the longevity and reliability of structures or equipment operating in such environments.
- 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: What are some innovative applications of special steel?
- The distinct properties and characteristics of special steel, also known as alloy steel, enable it to be utilized in a wide range of innovative applications. Some of these applications include: 1. Aerospace Industry: The aerospace industry extensively employs special steel for the production of critical components such as turbine blades, landing gears, and structural parts. Its exceptional strength, excellent corrosion resistance, and ability to withstand extreme temperatures make it an optimal choice for these applications. 2. Automotive Industry: Various applications in the automotive industry benefit from special steel, including the manufacture of engine components, suspension systems, and safety-related parts. Its remarkable strength-to-weight ratio and resistance to wear and fatigue ensure enhanced performance, durability, and safety in vehicles. 3. Medical Devices: Special steel finds use in the manufacturing of surgical instruments, implants, and medical equipment. Its biocompatibility, high strength, and corrosion resistance make it suitable for implant use in artificial joints, stents, and dental implants. 4. Energy Sector: The energy sector heavily relies on special steel, particularly in power plants, nuclear reactors, and oil and gas facilities. Special steel pipes and tubes are employed for fluid and gas conveyance, while its ability to withstand high temperatures is crucial for components like steam turbines and boilers. 5. Tooling and Machining: Special steel is extensively utilized in tooling and machining processes due to its exceptional hardness, toughness, and wear resistance. Its application in the production of cutting tools, dies, molds, and machine components ensures precision, extended tool life, and increased productivity. 6. Defense and Security: The defense and security sectors utilize special steel for the production of armored vehicles, ballistic protection, and military-grade equipment. Its capacity to withstand high impact and offer superior protection against projectiles and explosions make it an indispensable material for these applications. 7. Construction and Infrastructure: Special steel is widely employed in the construction industry for applications such as bridges, high-rise buildings, and infrastructure projects. Its high tensile strength, corrosion resistance, and durability ensure structural integrity and safety. 8. Renewable Energy: Special steel is employed in the renewable energy sector, particularly in wind turbines and solar energy systems. Its high strength and resistance to fatigue ensure the reliability and longevity of these energy generation systems. In conclusion, special steel, with its unique properties, finds numerous innovative applications across various industries. From aerospace and automotive to medical devices and renewable energy, this versatile material continues to drive advancements and meet the evolving needs of modern technology and society.
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SCM440 Alloy Steel Bar Hot-Rolled Bar
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25 m.t.
- Supply Capability:
- 500000 m.t./month
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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