• ASTM 4140 Alloy Steel Round Bar System 1
  • ASTM 4140 Alloy Steel Round Bar System 2
  • ASTM 4140 Alloy Steel Round Bar System 3
ASTM 4140 Alloy Steel Round Bar

ASTM 4140 Alloy Steel Round Bar

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Loading Port:
Tianjin
Payment Terms:
TT OR LC
Min Order Qty:
25 m.t.
Supply Capability:
50000 m.t./month

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Item specifice

Type:
Alloy Steel
Shape:
Steel Round Bar

ASTM 4140 Alloy Steel Round Bar 

 

Product Details:

1) Melting process: BOF + LF + VD

2) Heat treatment: Normalized / Annealed / Quenched / Tempered

3) Surface condition: Black surface / Peeled / Turned / Milled

4) Straightness: Max.3mm/1000mm

5) Appearance: Free of cracks, visible inclusions, pit on the appearance;

6) Guarantee: Ultrasonic test according to SEP 1921-84 G3 C/c

7) Certificate of quality: As per EN 10204/3.1B

8) Marking: Grade, Heat No.,Diameter will be stamped one each bar with required color

9) Packing: In bulk reinforced

10) MOQ: 10 tons / Grade / Size

11) Delivery time: 30 days

12) Payment: T/T 30% deposit, 70% balance upon photocopy of B/L copy, or 100% LC at sight.

 

Designation by Standards

rand Name

Ravne No.

Mat. No.

DIN

EN

 AISI

42CD4

514

1.7225

42CrMo4

-

 4140


Chemical Composition (in weight %)

C

Si

Mn

Cr

Mo

Ni

V

W

Others

0.39-0.45

0.1-0.4

0.6-0.9

0.9-1.2

0.15-0.25

 -

 -

 -

    -

 

Application:

Our products have been used in aviation,aerospace,navigation,nuclear energy,chemical industry,

electronic information,machine manufacture, petrochemical, automotive,instrument and meter, Communication ,transportation, and medical instruments etc.

 

Product Show:

ASTM 4140 Alloy Steel Round Bar

ASTM 4140 Alloy Steel Round Bar

Q:What are the requirements for special steel used in high-strength applications?
To ensure the performance and durability of special steel used in high-strength applications, specific requirements must be met. These requirements encompass various factors: 1. High tensile strength is crucial in withstanding heavy loads and resisting deformation. It enables the steel to endure greater stresses without failure. 2. Excellent toughness is essential as it allows the steel to absorb energy and resist fracture. This prevents sudden and catastrophic failure under impact or dynamic loading conditions. 3. Superior hardness is necessary to resist wear, abrasion, and indentation. It ensures that the material maintains its structural integrity and performance even in extreme conditions. 4. Good ductility is important alongside high tensile strength. It allows the steel to undergo plastic deformation without fracturing, making it suitable for forming or shaping during manufacturing. 5. Resistance to corrosion is vital to prevent degradation caused by moisture, chemicals, or harsh environments. This ensures the longevity and reliability of the steel in various conditions. 6. Heat resistance is required for applications involving high temperatures. It allows the steel to maintain its mechanical properties and structural stability under elevated temperatures. 7. Controlled alloying elements, such as chromium, molybdenum, nickel, or vanadium, are often added to enhance the steel's strength, toughness, hardness, and other desired properties. 8. Precise composition and microstructure are necessary to ensure consistent and predictable mechanical properties. This can be achieved through precise manufacturing processes like controlled cooling rates or heat treatments. By meeting these requirements, special steel used in high-strength applications can endure the demanding conditions it faces, providing reliable performance, longevity, and safety.
Q:What are the requirements for special steel used in chemical processing?
The requirements for special steel used in chemical processing include high corrosion resistance, exceptional strength and durability, resistance to high temperatures and extreme pressure, and compatibility with the specific chemicals being processed.
Q:Can special steel be used in the medical industry?
Yes, special steel can be used in the medical industry. Special steel, specifically stainless steel, is commonly used in the manufacturing of medical devices and equipment due to its corrosion resistance, biocompatibility, and sterilization capabilities. It is used for surgical instruments, implants, prosthetics, and various other medical applications where durability, hygiene, and non-reactivity are essential.
Q:How does aluminum contribute to the properties of special steel?
Special steel commonly incorporates aluminum as an alloying element to bolster its properties. The addition of aluminum yields multiple enhancements. Firstly, the inclusion of aluminum elevates the strength of the steel by creating a fine dispersion of aluminum nitride particles within the steel matrix. These particles act as barriers that impede dislocation movement, hindering steel deformation and amplifying its strength. Consequently, the steel becomes more resistant to mechanical stresses, thereby augmenting its load-bearing capacity. Secondly, aluminum also boosts the steel's corrosion resistance. It forms a protective oxide layer on the steel's surface, acting as a barrier against corrosive agents. This oxide layer prevents the steel from oxidizing, rusting, and deteriorating over time, thereby rendering it more durable and long-lasting in various environments. Moreover, aluminum can enhance the machinability of special steel. Its presence in the steel composition reduces the steel's tendency to work harden during machining operations. Consequently, cutting, drilling, or shaping the steel becomes easier, resulting in improved productivity and reduced tool wear. Furthermore, aluminum contributes to the heat resistance of special steel. With its high melting point and excellent thermal conductivity, aluminum aids in maintaining the steel's structural integrity at elevated temperatures. This renders aluminum-steel alloys suitable for applications demanding high-temperature resistance, such as those in the aerospace and automotive industries. In conclusion, aluminum plays a significant role in enhancing the properties of special steel. It bolsters strength, corrosion resistance, machinability, and heat resistance, making it a versatile material applicable in various fields.
Q:Can special steel be used in the production of surgical implants?
Yes, special steel can be used in the production of surgical implants. Special steel, such as stainless steel, is often preferred for surgical implants due to its high strength, corrosion resistance, and biocompatibility. It is commonly used for various types of implants, including orthopedic, dental, and cardiovascular implants.
Q:How does special steel perform under high-temperature oxidation?
Special steel is engineered to exhibit outstanding performance when exposed to high temperatures, particularly in terms of oxidation. It is fabricated utilizing alloys that possess a significant quantity of chromium, which generates a shielding chromium oxide layer on the steel's surface once confronted with elevated temperatures. This chromium oxide layer acts as a barrier, thwarting further oxidation and safeguarding the steel against corrosion. The generous amount of chromium present in special steel also heightens its resistance to scaling, which refers to the development of thick layers of oxide on the steel's surface. Scaling can compromise the steel's integrity and result in failure when subjected to high temperatures. Nonetheless, special steel retains its structural soundness even at elevated temperatures due to its capacity to resist scaling. Apart from chromium, special steel may contain additional alloying elements like nickel, molybdenum, and vanadium. These elements contribute to the steel's resistance to high-temperature oxidation by further augmenting the formation and stability of the protective oxide layer. Overall, special steel exhibits exceptional performance under high-temperature oxidation circumstances. Its distinctive composition and alloying elements enable it to establish a protective oxide layer, resist scaling, and retain its strength and integrity even at elevated temperatures. As a result, it is extensively utilized in various industries that involve high-temperature applications, including power generation, aerospace, and petrochemical industries.
Q:How does special steel contribute to the infrastructure development?
Special steel contributes to infrastructure development in several ways. Firstly, its high strength and durability make it an ideal material for constructing buildings, bridges, and other critical infrastructure. Special steel can withstand heavy loads, extreme temperatures, and harsh weather conditions, ensuring the longevity and safety of these structures. Secondly, special steel is widely used in the manufacturing of machinery and equipment required for infrastructure development projects. From excavators and cranes to pipelines and power transmission systems, special steel provides the necessary strength, resistance to corrosion, and reliability needed for efficient and sustainable infrastructure development. Furthermore, special steel plays a crucial role in the transportation sector. It is utilized in the construction of railway tracks, road barriers, and vehicles, ensuring safe and reliable transportation networks. Special steel is also used in the energy sector for the production and distribution of electricity, as it is capable of withstanding high temperatures and pressure in power plants and transmission lines. In summary, special steel's strength, durability, and versatility make it an essential material for infrastructure development. Its contribution lies in the construction of robust structures, manufacturing of machinery and equipment, and the development of reliable transportation and energy systems, thereby facilitating the growth and progress of infrastructure worldwide.
Q:What are the specific requirements for special steel used in the chemical reactor industry?
The special steel used in the chemical reactor industry can have varying specific requirements depending on the application and the chemicals being processed. However, there are generally expected requirements for this type of steel. First and foremost, the steel must possess outstanding resistance to corrosion. Chemical reactors often handle highly corrosive substances, such as acids, alkalis, and reactive chemicals. Hence, the steel must be able to withstand the corrosive effects of these substances to maintain the integrity and durability of the reactor. Secondly, the steel should exhibit resistance to high temperatures. Chemical reactions often require elevated temperatures to facilitate desired transformations. Therefore, the steel used in these reactors must be capable of enduring these high temperatures without compromising its structural integrity or experiencing significant deformation. Furthermore, the steel should possess favorable mechanical properties, including high strength and toughness. The reactor may undergo high pressure and mechanical stress during operation, so the steel needs to be able to withstand these conditions without failure. Additionally, the steel used in chemical reactors should be easily weldable and formable. This allows for convenient fabrication and construction of the reactor, ensuring a reliable and efficient manufacturing process. Moreover, the steel should have low levels of impurities, such as sulfur and phosphorus. These impurities can have adverse effects on the steel's corrosion resistance and mechanical properties. Therefore, the steel must adhere to stringent quality standards to ensure its suitability for use in the chemical reactor industry. In conclusion, the specific requirements for special steel used in the chemical reactor industry encompass excellent corrosion resistance, high temperature resistance, favorable mechanical properties, weldability, formability, and low impurity levels. Meeting these requirements is crucial to guarantee the safety, reliability, and efficiency of chemical reactors in various industrial processes.
Q:How is case-hardening steel used in the manufacturing of gears?
Case-hardening steel is used in the manufacturing of gears to enhance their durability and strength. The process involves heating the steel to a high temperature and then rapidly cooling it to create a hard outer layer, known as the case, while maintaining a relatively softer core. This hardened surface provides resistance to wear, abrasion, and fatigue, allowing the gears to withstand heavy loads and prolonged use. Additionally, case-hardening steel also improves the gear's ability to withstand impact and retain its shape, ensuring efficient and reliable performance in various mechanical applications.
Q:How does special steel contribute to the manufacturing of consumer goods?
Special steel plays a significant role in the manufacturing of consumer goods by providing enhanced durability, strength, and performance to various products. This type of steel is engineered with specific properties and alloys to meet the high standards and demands of consumer goods manufacturing. One of the primary ways special steel contributes to the manufacturing of consumer goods is through its strength and durability. It provides a solid foundation for products that need to withstand heavy use, such as kitchen appliances, power tools, and automotive components. The strength of special steel ensures that these products can withstand daily wear and tear, resulting in increased lifespan and reduced maintenance costs for consumers. Moreover, special steel's corrosion resistance properties make it an ideal material for consumer goods that are exposed to harsh environments or moisture. This is particularly important for products like kitchen utensils, cutlery, and bathroom fixtures, as they often come into contact with water or corrosive substances. By incorporating special steel, manufacturers can ensure that their products remain rust-free and maintain their aesthetic appeal over time. In addition to strength and corrosion resistance, special steel also offers enhanced performance capabilities. For instance, it can be used in the manufacturing of consumer goods that require high heat resistance, such as cooking appliances and automotive engine components. Special steel's ability to withstand extreme temperatures without deforming or losing its properties makes it a crucial material in these applications. Furthermore, special steel's versatility allows it to be tailored to specific consumer needs. Manufacturers can choose from a wide range of special steel alloys with varying characteristics, enabling them to optimize the performance of their products. This flexibility allows for the production of customized consumer goods that meet specific requirements, whether it be lightweight materials for portable electronics or impact-resistant components for sporting equipment. Overall, special steel plays a vital role in the manufacturing of consumer goods by providing strength, durability, corrosion resistance, and enhanced performance. Its unique properties contribute to the production of high-quality products that can withstand heavy use, offer extended lifespans, and ensure customer satisfaction.

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