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 methods of improving the creep resistance of special steel?
- There are several methods of improving the creep resistance of special steel, which are designed to enhance its ability to withstand long-term exposure to high temperatures and constant stress. Some of the methods commonly employed include: 1. Alloying: Special steel can be alloyed with specific elements to enhance its creep resistance. The addition of elements such as chromium, molybdenum, tungsten, and vanadium can significantly improve the material's ability to resist creep deformation. These alloying elements form strong carbides or intermetallic compounds, which impede the movement of dislocations and enhance the material's strength and resistance to creep. 2. Heat treatment: Precise heat treatment techniques can be employed to improve the creep resistance of special steel. Processes such as quenching and tempering, annealing, and normalizing can alter the steel's microstructure, leading to the formation of fine-grained and homogeneous structures that offer improved creep resistance. Heat treatment also helps in relieving residual stresses and improving the material's overall strength. 3. Grain refinement: Special steel can be subjected to processes that refine its grain structure, thereby enhancing its creep resistance. Techniques such as grain size reduction through controlled rolling, recrystallization, and severe plastic deformation can lead to the formation of smaller and more uniform grains. This refined microstructure hinders dislocation movement and improves the material's resistance to creep deformation. 4. Precipitation hardening: Special steel can be subjected to precipitation hardening methods, where the material is heated and then rapidly cooled to induce the formation of fine precipitates. These precipitates act as barriers to dislocation movement, improving the material's strength and creep resistance. 5. Surface modification: Special steel can be treated with surface modification techniques to increase its creep resistance. Methods such as shot peening, laser surface melting, and surface coatings can improve the surface integrity, reduce surface roughness, and introduce compressive residual stresses, all of which contribute to enhanced creep resistance. It is important to note that the selection and combination of these methods depend on the specific requirements of the application and the type of special steel being used. The aim is to optimize the material's microstructure, chemical composition, and surface characteristics to achieve the desired creep resistance and ensure long-term performance at elevated temperatures.
- Q: What are the specific requirements for special steel used in the mining industry?
- To ensure the durability, strength, and resistance to harsh conditions of special steel used in the mining industry, certain requirements must be met. Key requirements for this type of steel include: 1. High tensile strength is necessary to withstand heavy loads and resist deformation under extreme conditions. This enables the steel to endure the pressure, impact, and stress encountered during mining operations. 2. Excellent wear resistance is essential to prevent premature failure and increase the lifespan of mining equipment in abrasive environments. Rocks and ores can cause significant wear on the equipment. 3. High corrosion resistance is crucial in highly corrosive mining environments, such as underground mines or areas near water bodies. The steel should be able to withstand exposure to chemicals, moisture, and other corrosive agents to prevent rusting, pitting, and other forms of corrosion that weaken the steel. 4. Excellent toughness is required to withstand heavy impacts and vibrations that mining equipment is subjected to. If the steel is not tough enough, fractures can occur. The steel must be able to absorb energy from impacts and vibrations without fracturing, ensuring the safety and reliability of the equipment. 5. Good heat resistance is necessary to withstand high-temperature mining operations, such as smelting and refining processes. The steel should not lose its strength or undergo deformation under elevated temperatures. 6. Good machinability is important to allow for easy formation of complex shapes or structures. This facilitates the manufacturing process of mining equipment and components. Overall, meeting these requirements is crucial for ensuring the reliability, durability, and safety of mining equipment in demanding mining environments.
- Q: How is high-temperature tool steel used in the production of hot work tools?
- High-temperature tool steel is used in the production of hot work tools due to its exceptional heat resistance and strength properties. It can withstand the high temperatures generated during hot work processes such as forging, extrusion, and die casting, without losing its hardness or experiencing deformation. This steel is used to manufacture tooling components like dies, punches, and inserts, ensuring their longevity and performance in extreme heat conditions.
- Q: What are the different methods of preventing intergranular corrosion in special steel?
- Various techniques are available for preventing intergranular corrosion in special steel. 1. Heat Treatment: A highly effective approach involves subjecting the steel to solution annealing, a heat treatment process. This method entails heating the steel to a high temperature and rapidly cooling it. By doing so, any precipitates or carbides that may have formed along the grain boundaries are dissolved, thereby reducing the risk of intergranular corrosion. 2. Alloying: Another strategy is to introduce specific alloying elements into the steel composition. For instance, the addition of elements such as chromium and molybdenum can enhance the steel's resistance to intergranular corrosion. These alloying elements create a protective oxide layer on the surface, preventing corrosion along the grain boundaries. 3. Passivation: Passivation involves treating the steel surface with chemicals that establish a protective layer. This layer acts as a barrier, safeguarding the grain boundaries from the corrosive environment. Common passivation techniques include acid pickling and electrochemical methods. 4. Sensitization Control: Particular attention must be given to controlling the sensitization process. Sensitization occurs when the steel is exposed to high temperatures for an extended period, resulting in the precipitation of chromium carbides along the grain boundaries and rendering the steel vulnerable to intergranular corrosion. By carefully controlling the heating and cooling rates during processing, sensitization can be minimized or prevented. 5. Corrosion Inhibitors: Another option is the utilization of corrosion inhibitors, which are chemicals that can be applied to the steel surface to protect it from corrosion. These inhibitors form a protective film on the surface, preventing corrosive agents from attacking the grain boundaries. It is important to consider that the choice of method depends on the specific type of special steel and its intended application. Selecting the most suitable approach requires a comprehensive understanding of the steel's composition, processing conditions, and the expected corrosive environment.
- Q: What are the main applications of special steel in the semiconductor industry?
- Special steel finds various applications in the semiconductor industry, primarily in the manufacturing of critical components such as chambers, wafer carriers, and vacuum systems. Due to its high strength, corrosion resistance, and thermal stability, special steel is ideal for creating these parts that require durability and precision in maintaining the controlled environments necessary for semiconductor production. Additionally, special steel is also used in the fabrication of cutting tools and molds for semiconductor device manufacturing, further highlighting its importance in this industry.
- Q: Can special steel be used in the nuclear industry?
- Yes, special steel can be used in the nuclear industry. Special steel, also known as stainless steel, is often used in nuclear power plants due to its excellent corrosion resistance, high strength, and ability to withstand high temperatures. The nuclear industry requires materials that can withstand the harsh conditions of nuclear reactors, including exposure to radiation, high-pressure and high-temperature environments, and corrosive substances. Special steel has properties that make it suitable for these conditions, such as its resistance to corrosion and its ability to maintain its mechanical properties at elevated temperatures. Moreover, special steel is also used in the construction of nuclear fuel rods, storage containers, and other critical components. It is important to note that special steel used in the nuclear industry undergoes stringent quality control measures and testing to ensure its reliability and safety.
- Q: How does special steel contribute to the manufacturing of aerospace components?
- Special steel plays a vital role in the manufacturing of aerospace components due to its unique properties and characteristics. Its exceptional strength, durability, and resistance to extreme temperatures and corrosion make it an ideal material for various applications in the aerospace industry. One of the main contributions of special steel to aerospace manufacturing is its ability to withstand high stress and pressure. Aerospace components, such as turbine blades, landing gear, and structural supports, are subjected to tremendous forces during flight. Special steel's strength and toughness allow these components to endure these forces without failure, ensuring the safety and reliability of the aircraft. Additionally, special steel's resistance to extreme temperatures is crucial in the aerospace industry. Aircraft engines, for example, operate at extremely high temperatures, and special steel alloys, such as those containing nickel or cobalt, are used to manufacture components like turbine discs and combustion chambers. These alloys can withstand the intense heat and prevent deformation or failure, ensuring optimal engine performance and efficiency. Furthermore, special steel's resistance to corrosion is essential for aerospace applications. Aircraft are constantly exposed to harsh environmental conditions, including moisture, chemicals, and saltwater. Special steel alloys, such as stainless steel, are highly resistant to corrosion, preventing degradation and maintaining the structural integrity of aerospace components over time. This is particularly important for critical parts like fuel tanks, hydraulic systems, and airframe structures. In conclusion, special steel significantly contributes to the manufacturing of aerospace components by providing strength, durability, resistance to extreme temperatures, and corrosion resistance. Its unique properties ensure the safety, reliability, and longevity of aerospace systems, making it an indispensable material in the aerospace industry.
- Q: How is special steel used in the marine industry?
- Special steel is extensively used in the marine industry for various applications such as shipbuilding, offshore structures, and marine equipment. It is used to construct the hulls, decks, and superstructures of ships, providing strength, durability, and resistance to corrosion and impact. Additionally, special steel is utilized in the manufacturing of marine components like propeller shafts, rudders, and anchors, ensuring optimal performance and reliability in harsh marine environments.
- Q: What are the physical properties of special steel?
- Compared to regular steel, special steel possesses unique physical properties. These properties can vary depending on the specific composition and processing techniques employed. However, special steel typically exhibits high strength, hardness, and durability. Its design often aims to withstand extreme conditions, including high temperatures, pressure, and corrosive environments. Additionally, special steel may display exceptional wear resistance, making it suitable for applications involving heavy machinery or cutting tools. Moreover, it can possess superior electrical and thermal conductivity, along with favorable magnetic properties. In conclusion, the physical properties of special steel render it highly versatile and valuable across various industries, such as automotive, aerospace, construction, and energy.
- Q: How does special steel contribute to the manufacturing of power generation equipment?
- Special steel plays a crucial role in the manufacturing of power generation equipment by providing exceptional strength, durability, and resistance to extreme conditions. It is used in turbine blades, rotors, and other critical components, allowing for higher efficiency and performance. Additionally, special steel's ability to withstand high temperatures and corrosive environments ensures the longevity and reliability of power generation equipment, ultimately contributing to the overall efficiency and effectiveness of power generation processes.
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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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