Special Steel ASTM4140 Alloy Steel Round Bar

Special Steel ASTM4140 Alloy Steel Round Bar System 1

Special Steel ASTM4140 Alloy Steel Round Bar

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 30 m.t.

Supply Capability:: 10000 m.t./month

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Product information

1. Grade: 4140,SAE4140, 42CrMo4, 1.7225,SCM440

2. Specification: Dia: 16~800mm Length:2000-13000mm or as required

3. Process: EAF+LF+VD

4. Technique:Forged

5.Treatment:hot rolled,cold drawn

6.Mechanical performance:

Strength of extension	1080MPA
Yield point	930MPA
Elongation	12%
Contractibility rate	45%
Impacting energy	63J

7.Chemical composition(for reference only):

Grade	C	Si	Mn	P≤	S≤	Cr	Mo
SAE4140	0.38/0.43	0.15/0.35	0.75/1.00	0.035	0.035	0.80/1.10	0.15/0.25

8. Compared grades of 4140 steel

GB-China	AISI-America	DIN-GERMANY	JIS-Japan
42CrMo	4140	1.7225 42CrMo4	SCM440

GB-China

AISI-America

DIN-GERMANY

JIS-Japan

42CrMo

4140

1.7225

42CrMo4

SCM440

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Special Steel ASTM4140 Alloy Steel Round Bar

Shipping

1. FedEx/DHL/UPS/TNT for samples, Door-to-Door;

2. By Air or by Sea for batch goods, for FCL; Airport/ Port receiving;

3. Customers specifying freight forwarders or negotiable shipping methods!

Delivery Time: 3-7 days for samples; 5-25 days for batch goods.

Payment Terms

1.Payment: T/T, L/C, Western Union, MoneyGram,PayPal; 30% deposits; 70% balance before delivery.

2.MOQ: 1pcs

3.Warranty : 3 years

4.Package Informations: 1) EXPORT, In 20 feet (GW 25 ton) or 40 feet Container (GW 25 ton)

2)as customer's requirement

Why choose us?

(1) The leading exporter in China special steel industry.

(2) Large stocks for various sizes, fast delivery date.

(3) Good business relationship with China famous factories.

(4) More than 7 years steel exporting experience.

(5) Good after-sales service guarantee.

Q: What are the different surface finishing methods used for special steel?: There are several surface finishing methods used for special steel, each serving a specific purpose and achieving different results. Some of the common surface finishing methods for special steel include: 1. Grinding: Grinding is the process of using abrasive materials to remove excess material from the surface of the steel. It is typically used to achieve a smooth and polished finish, as well as to remove any imperfections or roughness. 2. Polishing: Polishing involves using polishing compounds and abrasive materials to create a smooth and shiny surface on the steel. This method is often used to enhance the aesthetic appeal of the steel and improve its corrosion resistance. 3. Shot blasting: Shot blasting is a technique that involves propelling small metal or mineral particles at high speeds onto the surface of the steel. This process helps to remove any contaminants, scale, or rust from the surface, resulting in a clean and uniform finish. 4. Electroplating: Electroplating is a process where a thin layer of metal is deposited onto the surface of the steel through an electrochemical reaction. This method is commonly used to enhance the appearance of the steel, improve its corrosion resistance, and provide a decorative or protective coating. 5. Passivation: Passivation is a chemical process that involves treating the surface of the steel with an acid solution to remove any impurities and create a passive, corrosion-resistant layer. This method is often used to improve the corrosion resistance of stainless steel and other alloys. 6. Coating: Coating is the process of applying a protective layer or coating onto the surface of the steel. This can include paints, lacquers, enamels, or other types of protective coatings that help to prevent corrosion, improve durability, or provide a specific aesthetic finish. It is important to note that the choice of surface finishing method for special steel depends on the desired outcome, such as aesthetics, corrosion resistance, or functionality. Additionally, the specific characteristics of the steel, such as its composition, hardness, and intended application, also play a significant role in determining the most suitable surface finishing method.

Q: How is special steel used in the aerospace industry?: Special steel is used in the aerospace industry for various applications due to its exceptional strength, durability, and resistance to extreme temperatures. It is commonly utilized in the manufacturing of aircraft structures, engine components, landing gear, and fasteners. The high strength-to-weight ratio of special steel enables the construction of lightweight yet robust parts, contributing to improved fuel efficiency and aircraft performance. Additionally, its ability to withstand harsh environmental conditions and maintain structural integrity makes it indispensable for ensuring the safety and reliability of aerospace systems.

Q: How is wear-resistant alloy steel used in the production of mining equipment?: Wear-resistant alloy steel is used in the production of mining equipment due to its exceptional strength, durability, and resistance to wear and tear. It is commonly utilized for manufacturing components such as crusher liners, bucket teeth, and cutting edges of excavation tools. This robust material helps mining equipment withstand harsh conditions and prolongs their lifespan, reducing maintenance costs and downtime.

Q: How does special steel perform in high-velocity impact conditions?: Special steel is specifically engineered to excel in high-velocity impact situations, providing outstanding performance. Its composition and metallurgical properties are unique, resulting in remarkable resistance to deformation and failure under extreme forces. A key characteristic of special steel is its exceptional strength, enabling it to withstand the immense forces encountered in high-velocity impact scenarios. This strength is achieved through meticulous alloying and heat treatment processes that enhance the material's capacity to absorb and distribute energy. Consequently, special steel can effectively resist deformation and preserve its structural integrity even when subjected to severe impact loads. Moreover, special steel possesses remarkable toughness, allowing it to absorb significant amounts of energy before fracturing. This characteristic is crucial in high-velocity impact conditions where the material must endure sudden and intense forces. The high toughness of special steel permits it to absorb and dissipate the impact energy, preventing catastrophic failure and ensuring the ongoing performance of the component or structure. Additionally, special steel often exhibits superb resistance to wear and abrasion, which is advantageous in high-velocity impact scenarios involving sliding or rubbing contact. This wear resistance guarantees that the material maintains its integrity and functionality even during prolonged and repetitive impact conditions, reducing the risk of premature failure. Overall, special steel excels in high-velocity impact conditions due to its exceptional strength, superb toughness, and superior wear resistance. Its ability to withstand extreme forces and efficiently absorb impact energy makes it the preferred choice for applications where durability and reliability are of utmost importance.

Q: What are the limitations of using special steel in high-stress applications?: There are several limitations to using special steel in high-stress applications. Firstly, special steel can be quite expensive compared to other materials. This can make it less feasible for certain projects or industries with budget constraints. Secondly, special steel may not always be readily available or easily sourced. This can lead to delays in production or construction timelines, which can be problematic in high-stress applications where time is of the essence. Additionally, special steel may have limitations in terms of its structural integrity. While it is generally stronger and more resistant to wear and tear compared to regular steel, it may still have certain limits in terms of load-bearing capacity. This means that in extremely high-stress applications, special steel may not be the most suitable choice. Moreover, special steel can be more difficult to work with compared to other materials. It may require specialized equipment or techniques for cutting, welding, or shaping, which can add complexity and cost to the manufacturing process. Lastly, special steel may have limitations in terms of its corrosion resistance. While it is generally more resistant to corrosion compared to regular steel, it may still be prone to rust or degradation if not properly maintained or exposed to harsh environments. This can be a concern in high-stress applications where the durability and longevity of the material are crucial. Overall, while special steel offers many benefits in high-stress applications, it is important to consider its limitations in terms of cost, availability, load-bearing capacity, workability, and corrosion resistance. These factors should be carefully evaluated to determine the most suitable material for a specific high-stress application.

Q: What are the properties of high-temperature alloy steel?: High-temperature alloy steel possesses several important properties, including excellent strength, resistance to corrosion and oxidation, exceptional heat resistance, and the ability to retain its mechanical properties even at elevated temperatures. These alloys are specifically designed to withstand extreme heat and pressure, making them ideal for applications in industries such as aerospace, power generation, and oil and gas.

Q: How does surface treatment enhance the performance of special steel?: Surface treatment enhances the performance of special steel by improving its corrosion resistance, wear resistance, and overall durability. It can also enhance the aesthetic appearance of the steel and provide additional functionalities such as anti-fingerprint or anti-glare properties. Surface treatments like coatings, plating, or heat treatment techniques can alter the surface characteristics of the steel, making it more resistant to harsh environments, reducing friction, and increasing its lifespan, ultimately enhancing its performance.

Q: What are the specific requirements for special steel used in the railway sector?: The specific requirements for special steel used in the railway sector include high tensile strength, excellent fatigue resistance, and good wear resistance. It should also have good ductility and toughness to withstand the dynamic loads and vibrations experienced by railway components. The steel must meet stringent dimensional tolerance and surface finish requirements to ensure proper fit and functionality. Additionally, it should have excellent heat resistance to withstand high temperatures generated during braking and friction.

Q: How does special steel contribute to the automotive sector?: The automotive sector greatly benefits from the inclusion of special steel, as it contributes significantly to the manufacturing and performance of different automotive components. This steel offers numerous advantages that enhance the quality, durability, and safety of vehicles. To begin with, special steel is renowned for its exceptional strength and toughness, making it well-suited for the production of crucial automotive parts such as engine components, chassis, suspension systems, and safety reinforcements. These parts necessitate high strength to endure the strains and stresses experienced during vehicle operation, thereby ensuring passenger safety. Moreover, special steel exhibits excellent resistance to wear, corrosion, and high-temperature environments, making it ideal for the production of gears, bearings, shafts, and exhaust systems that are exposed to harsh conditions. By incorporating special steel into these components, their lifespan, reliability, and overall performance are improved, consequently reducing maintenance and replacement costs for vehicle owners. Additionally, special steel allows for vehicle lightweighting, which is a constant objective for automakers aiming to enhance fuel efficiency and reduce emissions. Special steel alloys, such as high-strength low-alloy (HSLA) steel, possess a unique combination of strength and lightweight properties, enabling manufacturers to design lighter and more fuel-efficient vehicles without compromising safety or performance. Apart from its mechanical properties, special steel also contributes to the automotive sector through its versatility in manufacturing processes. It can be easily formed, welded, and machined, thereby enabling the creation of complex shapes and designs for automotive parts. This flexibility expands the possibilities for design and allows for innovative solutions to meet the ever-evolving needs of the automotive industry. In conclusion, special steel plays a vital role in the automotive sector by providing strength, durability, and lightweight properties to various components. Its incorporation in critical parts ensures vehicle and passenger safety, while its resistance to wear and corrosion improves the longevity and performance of automotive systems. With the automotive industry's constant drive for fuel efficiency and innovation, special steel remains an essential material in shaping the future of automobiles.

Q: How is special steel used in the production of aircraft components?: Special steel is used in the production of aircraft components due to its superior strength, durability, and resistance to corrosion. It is commonly used in critical parts such as engine components, landing gear, and structural elements. The unique properties of special steel ensure that aircraft components can withstand high temperatures, extreme pressures, and demanding operating conditions, ensuring the safety and reliability of aircraft.

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