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: Does special steel require special machining techniques?: Yes, special steel often requires special machining techniques due to its unique properties and characteristics. Special steels can have higher hardness, greater strength, improved corrosion resistance, or other desirable attributes that make them more challenging to machine compared to regular steels. Specialized cutting tools, machining parameters, and techniques may be necessary to achieve the desired precision, surface finish, and dimensional accuracy during the machining process.

Q: Is special steel resistant to wear and abrasion?: Yes, special steel is known for its high resistance to wear and abrasion. Special steel is often manufactured with specific alloying elements and heat treatment processes that enhance its hardness and toughness. These properties make it highly resistant to the detrimental effects of wear and abrasion, making it suitable for applications that require durability and longevity. Special steels are commonly used in industries such as automotive, aerospace, construction, and manufacturing, where components are subjected to harsh environments or repetitive mechanical actions that can cause wear and abrasion.

Q: What are the applications of special steel in the railway industry?: Special steel has a wide range of applications in the railway industry. It is commonly used in the manufacturing of rails, which need to be durable and able to withstand heavy loads and constant wear and tear. Special steel is also used in the construction of railway bridges and tunnels, as it offers high strength and resistance to corrosion. Additionally, special steel is used in the production of various railway components such as wheels, axles, and couplers, ensuring safety and reliability in train operation.

Q: How does special steel contribute to the automotive racing aftermarket industry?: Special steel plays a crucial role in the automotive racing aftermarket industry by providing the necessary strength, durability, and performance required for high-performance racing vehicles. In this industry, where speed, precision, and safety are paramount, special steel offers unique properties that enable engineers and manufacturers to push the limits of performance. One key way that special steel contributes to the automotive racing aftermarket industry is through its ability to withstand extreme conditions. Racing vehicles are subjected to intense heat, pressure, and vibrations during high-speed races, which can put immense stress on various components. Special steel, with its exceptional heat resistance and high tensile strength, ensures that critical parts like engine components, transmission gears, and suspension systems can withstand these harsh conditions without compromising performance or safety. Furthermore, special steel is known for its lightweight properties, making it an ideal material for racing vehicle components. Weight reduction is a crucial aspect of racing as it directly impacts acceleration, handling, and overall performance. By using special steel, manufacturers can create lighter yet stronger components, allowing racing teams to achieve higher speeds, better maneuverability, and improved fuel efficiency. Special steel also contributes to the automotive racing aftermarket industry by offering excellent machinability and weldability. This allows for precise customization and modification of components, catering to the specific needs and preferences of racing teams. Whether it is creating custom engine blocks, exhaust systems, or chassis reinforcements, special steel provides the flexibility required to optimize performance and gain a competitive edge. Moreover, the use of special steel in the automotive racing aftermarket industry promotes innovation and technological advancements. Steel manufacturers continually develop new alloys and compositions that enhance the performance capabilities of racing vehicles. These advancements can include improved corrosion resistance, better fatigue strength, and enhanced material properties, all of which contribute to the overall performance and longevity of racing vehicle components. In summary, special steel is a vital contributor to the automotive racing aftermarket industry. Its unique combination of strength, durability, lightweight properties, and machinability enables racing teams to design and manufacture high-performance vehicles that can withstand extreme conditions. By leveraging the advantages of special steel, the industry can continue to push the boundaries of automotive racing, delivering faster, safer, and more efficient racing machines.

Q: What are the requirements for special steel used in high-performance racing cars?: In order to meet the demands of the racing environment, the requirements for special steel used in high-performance racing cars are quite strict. Some of the main requirements include: 1. Exceptional strength and durability: The special steel must possess outstanding strength and durability to endure the extreme loads and stresses encountered during high-speed racing. It must have a high tensile strength and the ability to withstand fatigue and deformation under intense conditions. 2. Lightweight: Racing cars require lightweight materials to achieve optimal performance and maneuverability on the track. The special steel used in high-performance racing cars must have a high strength-to-weight ratio, allowing for reduced weight without compromising strength or safety. 3. Excellent heat resistance: The steel must have excellent heat resistance to withstand the high temperatures generated by high-performance engines, braking systems, and exhaust systems. It must maintain its structural integrity and mechanical properties even under extreme heat conditions. 4. High corrosion resistance: Racing cars are often exposed to harsh environments, including moisture, salt, and other corrosive elements. Therefore, the special steel used in racing cars should have high corrosion resistance to prevent rust and degradation, ensuring the longevity and reliability of the components. 5. Easy machinability: The steel should be easily machinable, facilitating the precise manufacturing and fabrication of complex components. This ensures that the parts can be produced accurately and efficiently, resulting in superior performance and reliability. 6. Good weldability: The special steel used in racing cars should have good weldability, as welding is often required for the assembly of various components. It should be able to withstand the heat generated during welding without experiencing significant loss in strength or other mechanical properties. In summary, the requirements for special steel used in high-performance racing cars revolve around strength, lightweight, heat resistance, corrosion resistance, machinability, and weldability. Meeting these requirements is essential to ensure the safety, performance, and success of racing cars on the track.

Q: What are the different methods of controlling the grain size in special steel?: Some of the different methods of controlling the grain size in special steel include thermomechanical processing, alloying elements, grain refinement techniques such as grain size control agents, and heat treatment methods like annealing and quenching.

Q: What are the main corrosion resistance properties of special steel?: The main corrosion resistance properties of special steel include high resistance to rust, oxidation, and chemical attack. It can withstand harsh environments, such as exposure to saltwater, acids, and alkalis, without significant degradation. Additionally, special steel often possesses a passive oxide layer on its surface, which acts as a protective barrier against corrosion.

Q: What are the specific requirements for special steel used in the mining drill bit industry?: The mining drill bit industry has specific requirements for the special steel it utilizes, which focus on durability, toughness, and resistance to wear and corrosion. To begin with, the steel employed in mining drill bits must possess exceptional durability to endure the harsh and demanding conditions found in the mining environment. The drill bits are exposed to high levels of impact, vibration, and stress, necessitating high strength and hardness in the steel to prevent deformation or breakage. Moreover, toughness plays a crucial role in drill bit steel as it must withstand the repetitive and intense forces encountered during drilling operations. The steel should exhibit good fracture toughness to resist crack propagation and prevent premature failure. Additionally, wear resistance is of utmost importance for drill bit steel, as it must retain its cutting edge and performance over long periods. The steel needs to have high wear resistance to withstand the abrasive nature of the rocks and minerals being drilled. Furthermore, apart from wear resistance, the steel utilized in mining drill bits must also demonstrate resistance to corrosion. The mining environment often involves exposure to water, chemicals, and various corrosive agents. Hence, the steel should possess suitable corrosion resistance properties to prevent rusting and degradation. In conclusion, the special steel employed in the mining drill bit industry must fulfill these specific requirements of durability, toughness, wear resistance, and corrosion resistance to ensure reliable and efficient drilling operations in the mining sector.

Q: What is the fatigue strength of special steel?: The fatigue strength of special steel refers to its ability to withstand repeated loading and unloading without failure. It is typically higher than that of regular steel due to its enhanced composition and manufacturing process, which makes it more resistant to fatigue and allows it to endure higher stress levels.

Q: How does special steel perform in high-temperature creep resistance?: The outstanding performance of special steel in resisting high-temperature creep is well-known. Creep refers to the tendency of a material to deform or strain under constant stress when it is subjected to elevated temperatures. Ordinary steels may experience notable creep under such conditions, which can result in a decrease in their mechanical properties and potential failure. However, special steels are specifically engineered to endure high-temperature creep, making them extremely suitable for applications where resistance to time-dependent deformation is crucial. These steels are frequently alloyed with elements like chromium, molybdenum, and vanadium, which enhance their properties at high temperatures. The alloying elements present in special steels create stable carbides and nitrides, which serve as strengthening agents. They hinder grain growth and prevent dislocation movement, thereby leading to improved creep resistance and structural stability even in extremely high temperatures. Moreover, special steels often undergo heat treatment processes like quenching and tempering, which further enhance their resistance to creep and overall mechanical performance. Additionally, the microstructure of special steels is meticulously controlled during the manufacturing process to ensure optimal resistance to creep. Typically, fine-grained structures with a high concentration of precipitates or second-phase particles are developed. These structures impede dislocation movement and enhance creep strength. To summarize, special steels possess exceptional resistance to high-temperature creep due to their alloying elements, heat treatment processes, and controlled microstructures. They can withstand prolonged exposure to elevated temperatures without significant deformation or loss of mechanical properties, making them indispensable in industries such as aerospace, power generation, and petrochemicals where high-temperature applications are prevalent.

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