DIN1.7225 Alloy Structural Steel Rod 4140 Special Steel

DIN1.7225 Alloy Structural Steel Rod 4140 Special Steel

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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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The details of our Steel

1. Produce Standard: as the GB, AISI, ASTM, SAE, EN, BS, DIN, JIS Industry Standard

2. Produce processes: Smelt Iron -EAF smelt Billet - ESR smelt Billet -Hot rolled or forged get the steel round bar and plate

3. Heat treatment:

Normalized / Annealed / Quenched+Tempered

4. Quality assurance:

All order we can received Third party inspection, You can let SGS, BV,.. and others test company test and inspect our products before Goods shipping.

Product information

Chemical Composition(%) of 4140 round steel	C	Si	Mn	P	S	Cr	Mo
	0.38-0.45	≤0.40	0.60-0.90	≤0.035	≤0.035	0.90-1.20	0.15-0.30
Specification of 4140 round steel	Hot Rolled: Dia.(mm)L(mm)=14-2002000-6000
	Forged: Dia.(mm)L(mm)=210-8002000-6000
Application of 4140 round steel	(1) Commonly used for manufacturing 35CrMo higher than the required strength, large parts of the important sectional dimensions, such as axis, gear, connecting rod, transmission gears, the supercharger gear, engine cylinder, spring, spring clamps, 12-2000mm oil pipe fittings, fishing tools and instead of containing nickel steel high. (2) For main shaft of steamer,boly for 400 °C. Hummar shank.
Characteristic of 4140 round steel	(1) Chromium molybdenum high tensile steel with yield strength of 550N/mm2. (2) Chromium renders steel oil hardenable and increase hardenability. (3) Weldability suffers with increasing chromium content. (4) High temperature strength and high pressure hydrogenation properties are promoted by chromium and molybdenum. (5) Molybdenum significantly reduces temper brittleness.
Heat Treatment of 4140 round steel	Forging:1100~900°C Normalization:860~880°C Subcritical Annealing:680~720°C Isothermal Annealing:830~900 670x3h°C Hardening:830~860 oil Tempering:550~650°C
Mechanical Properties of 4140 round steel	Tensile str. (N/mm2):1080 Yield point (N/mm2):930 Elongation (%):12 Contraction (%):45 Impack work (J/cm2):63 Hardness (HB):217
Delivery Condition of 4140 round steel	hot rolled, black surface, annealed
Payment Term of 4140 round steel	L/C at sight,T/T,30% in advance,70% before the shipment

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DIN1.7225 Alloy Structural Steel Rod 4140 Special Steel

Q:What are the main elements in special steel alloys?: The main elements in special steel alloys vary depending on the specific alloy, but commonly include elements such as chromium, nickel, molybdenum, and vanadium. These elements are added to enhance the properties of steel, such as corrosion resistance, strength, hardness, or heat resistance, making them suitable for specific applications in industries such as aerospace, automotive, and construction.

Q:What are the properties of shock-resistant steel?: Shock-resistant steel is a type of steel that possesses certain properties that make it highly resistant to shock or impact. These properties include high toughness, strength, and ductility. It can absorb and distribute the energy generated by an impact, thus preventing the material from fracturing or breaking. Additionally, shock-resistant steel often has a high hardness, which further enhances its ability to withstand sudden loads and impacts without deforming or failing. These properties make shock-resistant steel suitable for applications that require protection against heavy impacts, such as in construction, automotive, and military industries.

Q:How does special steel perform in terms of weldability?: Special steel generally performs well in terms of weldability. It has good ductility and can be easily welded using various welding methods such as arc welding, resistance welding, and laser welding. The composition and properties of special steel are specifically designed to ensure that it can be successfully welded without compromising its strength and integrity. However, the specific weldability of special steel may vary depending on its exact composition and specific grade. It is always recommended to consult the manufacturer's guidelines and follow proper welding procedures to achieve the best results when working with special steel.

Q:What are the effects of different heat treatment processes on special steel?: Different heat treatment processes can have significant effects on the properties and performance of special steel. These processes are designed to alter the microstructure of the steel, thereby influencing its hardness, strength, toughness, and other mechanical properties. One commonly used heat treatment process is annealing, which involves heating the steel to a specific temperature and then slowly cooling it down. Annealing helps to relieve internal stresses, improve machinability, and enhance the ductility of the steel. It also refines the grain structure, making the steel more uniform and reducing the risk of cracks or other defects. Another heat treatment process is quenching, where the steel is heated to a high temperature and then rapidly cooled by immersing it in a quenching medium such as oil or water. This process results in the formation of a hardened microstructure, increasing the steel's hardness and wear resistance. However, quenching can also make the steel brittle, so it is often followed by a tempering process. Tempering involves reheating the quenched steel to a lower temperature and holding it there for a specific duration. This process helps to reduce the brittleness caused by quenching and improve the steel's toughness and ductility. The resulting microstructure is a balance between hardness and toughness, making the steel suitable for applications that require both strength and impact resistance. Other heat treatment processes, such as normalizing and stress relieving, can also be used to achieve specific properties in special steel. Normalizing involves heating the steel to a temperature above its critical point and then allowing it to cool in still air. This process refines the grain structure and improves the steel's strength and machinability. Stress relieving, on the other hand, aims to remove residual stresses from the steel by heating it to a temperature below its critical point and then slowly cooling it. In summary, the effects of different heat treatment processes on special steel are manifold. These processes can modify the steel's microstructure, resulting in changes in hardness, strength, toughness, and other mechanical properties. By selecting the appropriate heat treatment process, manufacturers can tailor the steel's characteristics to suit specific applications, ensuring optimal performance and longevity.

Q:What are the common alloys used in special steel?: Some common alloys used in special steel include stainless steel (which contains chromium and nickel), tool steel (which contains tungsten, molybdenum, and vanadium), and high-speed steel (which contains tungsten, molybdenum, and cobalt).

Q:How is high-strength alloy steel used in the production of structural components?: High-strength alloy steel is used in the production of structural components due to its exceptional strength-to-weight ratio and durability. It provides enhanced load-bearing capabilities, allowing for the construction of lighter yet stronger structures. This steel is commonly utilized in manufacturing beams, columns, and other vital components of buildings, bridges, and infrastructure projects, ensuring the structural integrity and safety of these constructions.

Q:How does special steel perform in radiation shielding applications?: Special steel is renowned for its outstanding performance in shielding against radiation, widely recognized for its unique properties and composition. It is an ideal choice in safeguarding against harmful radiation due to its exceptional qualities. One significant advantage of special steel is its remarkable density, which allows for the effective absorption and attenuation of radiation. This attribute enables it to serve as a barrier, effectively preventing the penetration of harmful radiation into sensitive areas. By significantly reducing radiation exposure, special steel plays a crucial role in diverse industries, including nuclear power plants, medical facilities, and aerospace applications. Furthermore, special steel possesses excellent mechanical strength and durability, ensuring long-lasting and reliable radiation shielding. It can withstand extreme conditions while maintaining its effectiveness over time. This durability is particularly vital in environments with continuous or ongoing radiation exposure. Moreover, special steel exhibits high resistance to corrosion and degradation, making it indispensable in radiation shielding applications. This resistance ensures the material remains intact and can provide the necessary protection against radiation for an extended period. As a result, frequent maintenance and replacement are minimized, leading to cost savings and improved operational efficiency. Additionally, special steel can be customized to meet specific requirements, allowing for tailored designs and configurations. This flexibility enables the development of radiation shielding solutions optimized for the unique needs of various applications. Whether it involves shielding panels, containers, or enclosures, special steel can be adapted to provide the most efficient and effective radiation protection. In summary, special steel excels in radiation shielding applications due to its high density, mechanical strength, durability, corrosion resistance, and customization capabilities. It offers reliable and long-lasting radiation protection, ensuring the safety of personnel and equipment in industries where radiation exposure is a concern.

Q:What are the different joining methods used for special steel?: The different joining methods used for special steel include welding, brazing, soldering, and mechanical fastening.

Q:How does the composition of special steel affect its properties?: The composition of special steel greatly affects its properties. By adjusting the amounts of elements like carbon, manganese, chromium, and nickel, the steel's hardness, strength, corrosion resistance, and heat resistance can be modified. Additionally, the presence of specific elements can also enhance other properties such as toughness, wear resistance, and machinability. Therefore, careful control of the composition allows manufacturers to tailor the steel's properties to meet specific requirements for different applications.

Q:How does special steel contribute to the manufacturing industry?: Special steel contributes to the manufacturing industry by providing superior strength, durability, and performance in various applications. Its unique composition and properties allow for the production of high-quality components and machinery that can withstand extreme conditions, ensuring safety and reliability. Additionally, special steel enables manufacturers to create lightweight and efficient products, leading to cost savings and environmental sustainability.

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