Hot Rolled Structural Steel Round Bar 25MoCr4/1.7325

Hot Rolled Structural Steel Round Bar 25MoCr4/1.7325

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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

Designation by Standards

Brand Name	LH No.	Mat. No.	DIN	AISI
25MOCR4	782	1.7325	25Mo Cr4	8625

Chemical Composition (in weight %)

C	Si	Mn	Cr	Mo
0.25	0.30	0.70	0.50	0.50

Description
Steel intended for direct hardening.

Applications
Gear components of all kind, link components, arbors, axles, bolts, bushes, coupling boxes for direct hardening.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 210
Density [g/cm³]: 7.85

Soft Annealing
Heat to 650-700^oC, cool slowly. Intermediate annealing: 650-680^oC.

Carburizing
Temperature: 900-950^oC, water, oil or hot quenching 160-250^oC.

Core Hardening
Temperature: 890-920^oC.

Surface Hardening
Harden from a temperature of 780-820^oC followed by water or oil quenching.

Tempering
Tempering temperature: 150-210^oC.

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Hot Rolled Structural Steel Round Bar 25MoCr4/1.7325

Q: How does the availability of raw materials affect the production of special steel?: The availability of raw materials significantly impacts the production of special steel. Raw materials, such as iron ore, coal, and various alloys, are crucial components in the steel manufacturing process. A limited supply or increased cost of these materials can hinder production and result in higher production costs. Additionally, the quality and consistency of raw materials influence the final product's properties and performance. Therefore, the availability of raw materials directly affects the overall production capacity, cost-effectiveness, and quality of special steel.

Q: What are the properties of martensitic steel?: Martensitic steel is characterized by its high strength, hardness, and wear resistance. It possesses a unique microstructure consisting of a body-centered tetragonal crystal lattice, resulting in its distinctive properties. Martensitic steel can be hardened through quenching and tempering processes, allowing it to maintain its strength even at elevated temperatures. Additionally, it exhibits good corrosion resistance and is commonly used in applications that require high toughness and durability, such as in cutting tools, surgical instruments, and automotive components.

Q: What are the future prospects for the special steel industry?: The future prospects for the special steel industry are promising. With advancements in technology, increasing demand for high-performance materials in various sectors such as automotive, aerospace, and construction, the special steel industry is expected to witness steady growth. Additionally, the shift towards sustainable and lightweight materials in industries like renewable energy and electric vehicles presents new opportunities for the special steel industry. However, the industry may face challenges in terms of environmental regulations and competition from alternative materials. Overall, the future outlook for the special steel industry looks favorable, driven by technological advancements and evolving market demands.

Q: What's the difference between special steel and ordinary steel?: Special steel is a kind of steel with special chemical composition (alloying), produced by special process, special organization and performance, and can meet special requirement.

Q: What are the main factors affecting the impact toughness of special steel?: The impact toughness of special steel, or any material for that matter, is influenced by various factors. Some of the main factors affecting the impact toughness of special steel are: 1. Composition: The chemical composition of the steel plays a significant role in determining its impact toughness. Elements such as carbon, manganese, silicon, nickel, and molybdenum can be added to enhance the toughness of the steel. Higher carbon content generally improves hardness but reduces toughness, while alloying elements like nickel and molybdenum can enhance toughness. 2. Heat treatment: The heat treatment process, including processes like quenching and tempering, can significantly affect the impact toughness of special steel. Proper heat treatment can refine the microstructure of the steel, making it more resistant to fractures and increasing its toughness. 3. Microstructure: The microstructure of the steel, including the size, shape, and distribution of its grains, greatly impacts its toughness. Fine-grained steels generally exhibit better toughness compared to coarse-grained ones. The presence of certain phases, such as martensite or bainite, can also affect the impact toughness. 4. Inclusions: The presence of non-metallic inclusions, such as sulfides, oxides, or carbides, in the steel can act as stress concentration points and reduce its impact toughness. High-quality special steels often undergo processes like vacuum degassing or electroslag remelting to minimize the presence of these inclusions. 5. Processing conditions: The manufacturing processes used to produce special steel can influence its impact toughness. Factors such as forging, rolling, or extrusion conditions, as well as the cooling rate during solidification, can affect the microstructure and, consequently, the toughness of the steel. 6. Temperature: The impact toughness of special steel also varies with temperature. Some steels exhibit good toughness at low temperatures, while others may have better performance at higher temperatures. The temperature at which the steel is used or tested is an important factor to consider when evaluating its impact toughness. It is worth noting that the impact toughness of special steel is often determined using standardized tests, such as the Charpy or Izod test, which involve subjecting a notched specimen to impact loading. These tests provide valuable information on the material's ability to absorb energy and resist fracture under impact conditions.

Q: What are the different methods of surface pickling for special steel?: Pickling special steel can be achieved through various methods. These methods comprise acid pickling, electrolytic pickling, mechanical pickling, and passivation. The most commonly employed method for pickling special steel is acid pickling. It entails immersing the steel in an acid solution, typically hydrochloric acid or sulfuric acid, to eliminate any surface impurities. By reacting with the steel's oxide layer, the acid dissolves it, leaving a pristine surface. Electrolytic pickling, on the other hand, involves passing an electric current through the steel submerged in an electrolyte solution. This creates a chemical reaction that removes surface impurities. Electrolytic pickling offers better control and enables a more consistent surface finish compared to acid pickling. Mechanical pickling utilizes abrasive materials like sandpaper or wire brushes to physically scrub the steel's surface and eliminate any scale or rust. It is often combined with acid or electrolytic pickling to achieve the desired surface finish. After pickling, special steel can undergo passivation to enhance its corrosion resistance. Passivation entails treating the steel with a chemical solution, typically nitric acid or citric acid, to form a protective oxide layer on the surface. This layer prevents further corrosion and enhances the steel's overall durability. It's worth mentioning that the specific method of surface pickling for special steel may vary depending on factors such as the type of steel, desired surface finish, and intended application. Therefore, it is essential to consult experts or adhere to the manufacturer's guidelines to ensure the appropriate pickling method is employed for special steel.

Q: What are the different methods for joining special steel components?: There are several methods for joining special steel components, including welding, brazing, soldering, and mechanical fastening. Welding involves melting the base metals and adding a filler material to create a strong bond. Brazing and soldering use a lower melting point filler material to join the components. Mechanical fastening includes methods like bolts, screws, and rivets to hold the components together. Each method has its own advantages and is chosen based on the specific requirements of the application.

Q: How is carbon steel used in the manufacturing of pipes and tubes?: Carbon steel is commonly used in the manufacturing of pipes and tubes due to its high strength and durability. It provides excellent resistance to corrosion and can withstand extreme temperatures and pressure. Additionally, carbon steel can be easily formed and welded, making it ideal for the fabrication process involved in producing pipes and tubes.

Q: How does special steel contribute to the manufacturing of automotive engine components?: The manufacturing of automotive engine components heavily relies on special steel to enhance their strength, durability, and performance. Special steel possesses unique properties that make it suitable for critical engine parts like crankshafts, camshafts, connecting rods, valve springs, and cylinder heads. The exceptional strength of special steel is one of its primary advantages in automotive engine components. Engine parts made from special steel can withstand high stress, heavy loads, and extreme temperatures without experiencing deformation or failure. This strength ensures that the engine operates efficiently and reliably, even under demanding conditions. Furthermore, special steel offers superior durability, which is crucial for the longevity and performance of engine components. Its resistance to wear, corrosion, and fatigue ensures that the engine parts maintain their functionality for an extended period. This durability translates into increased lifespan and reduced maintenance requirements for the engine, resulting in higher customer satisfaction and lower costs for vehicle owners. The use of special steel in automotive engine components also contributes to improved performance. Special steel allows for the creation of lightweight components, reducing the overall weight of the engine and enhancing fuel efficiency. Additionally, the high precision and dimensional accuracy achievable with special steel manufacturing processes result in better engine performance, reduced friction, and improved power output. Moreover, special steel exhibits excellent machinability, simplifying the manufacturing process of engine components. Its ability to be easily formed, cut, and shaped enables the production of complex designs and intricate features, leading to enhanced efficiency and performance in the final product. In conclusion, special steel plays a vital role in the manufacturing of automotive engine components due to its exceptional strength, durability, and performance. Its usage results in engines that are more reliable, efficient, and long-lasting, ultimately contributing to the overall quality and satisfaction of vehicles.

Q: How does the heat treatment process affect special steel?: The heat treatment process greatly affects special steel by altering its microstructure, improving its mechanical properties, and enhancing its overall performance. The process involves heating the steel to a specific temperature and then cooling it at a controlled rate. This changes the steel's internal structure, making it stronger, more durable, and resistant to wear and corrosion. Additionally, heat treatment can modify the steel's hardness, toughness, and flexibility, making it suitable for specific applications such as cutting tools, automotive parts, or aerospace components.

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