Special Steel Round Bar AISI 4140 Alloy Steel

Special Steel Round Bar AISI 4140 Alloy Steel System 1

Special Steel Round Bar AISI 4140 Alloy Steel

Ref Price:

Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 10000 m.t./month

Inquire Now

Add to My Favorites

OKorder Service Pledge

Quality Product, Order Online Tracking, Timely Delivery

OKorder Financial Service

Credit Rating, Credit Services, Credit Purchasing

Special Steel Round Bar AISI 4140 Alloy Steel

1.4140/1.7225/42CrMo4/SCM440/EN19
2.good price and fast delivery time
3.large stocks

‍Equivalent grades

GB	DIN	AISI	JIS
42CrMo	1.7225	4140	SCM440

Chemical Composition

C	Si	Mn	Cr	Mo	P	S
0.38-0.43	0.40max	0.60-0.90	0.90-1.20	0.15-0.30	≤0.035	≤0.035

Available size

Round steel bar 10-800mm
Flat steel bar 25-400mm*200-800mm

Surface condition

Black surface/ Grinded/ Machined

Black surface/ Grinded/ Machined

Hardness

Annealed HBS 217 max

Annealed HBS 217 max

Characteristics

4140 Alloy Steel/SAE 4140 Steel Price is engineering steel supplied in quenched and tempered conditions. Very good machinability. High toughness. High creep strength. Repeated impact resistant capability.

4140 Alloy Steel/SAE 4140 Steel Price is engineering steel supplied in quenched and tempered conditions. Very good machinability. High toughness. High creep strength. Repeated impact resistant capability.

Applications

4140 Alloy Steel/SAE 4140 Steel Price is use to producecomponents with high requirements on toughness, e.g. gear wheels, pinions, connecting rods, parts for mechanical engineering .

4140 Alloy Steel/SAE 4140 Steel Price is use to producecomponents with high requirements on toughness, e.g. gear wheels, pinions, connecting rods, parts for mechanical engineering .

Heat treatment

Forging		Heat to 1150°C. Hold until uniform. Minimum forging temperature 850°C.Cool slowly in ashes or sand etc.
Annealing		Heat to 830°C-850°C.Cool in furnace.
Normalising		Heat to 870°C-900°C.Cool in still air.
Stress Relieving		Annealed: Heat to 600°C-650°C.Hardened: Heat to 500°C-550°C.Cool in still air.
Hardening		Heat to 830°C-880°C. Quench in oil or polymer.
Tempering		Heat to 450°C-700°C cool in still air. NB. Tempering within the range 200°C-420°C will result in temper brittleness and should be avoided.

Product show：

.jpg

Workshop show：

Special Steel Round Bar AISI 4140 Alloy Steel

FAQ:

1, Your advantages?

professional products inquiry, products knowledge train (for agents), smooth goods delivery, excellent customer solution proposale

2, Test & Certificate?

SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem

3, Payment Terms?

30% TT as deposit and 70% before delivery.

Irrevocable L/C at sight.

4, Trading Terms?

EXW, FOB, CIF, FFR, CNF

5, After-sale Service?

We provides the services and support you need for every step of our cooperation. We're the business partner you can trust.

For any problem, please kindly contact us at any your convenient time.

We'll reply you in our first priority within 24 hours.

Q: How is special steel tested for quality?: Special steel is tested for quality through various methods such as chemical analysis, mechanical testing, and non-destructive testing. Chemical analysis involves examining the composition of the steel to ensure it meets the specified standards and requirements. Mechanical testing involves evaluating the steel's strength, hardness, and other mechanical properties. Non-destructive testing methods like ultrasonic testing or magnetic particle inspection are used to detect any internal defects or flaws in the steel without causing any damage. These rigorous testing procedures ensure that special steel meets the desired quality standards before it is used in various applications.

Q: How is high-temperature stainless steel used in the production of gas turbines?: High-temperature stainless steel is used in the production of gas turbines due to its excellent resistance to corrosion and oxidation at elevated temperatures. It is primarily used to manufacture critical components like turbine blades, vanes, and combustion chambers, which are exposed to extreme heat and pressure inside the turbine. The high-temperature stainless steel ensures durability, performance, and longevity of gas turbines, enabling them to operate efficiently in demanding conditions.

Q: How does special steel perform in extreme weather conditions?: Special steel is designed to perform exceptionally well in extreme weather conditions. It has high resistance to corrosion, which means it can withstand exposure to harsh elements such as rain, snow, and saltwater without deteriorating. Additionally, special steels exhibit excellent strength and toughness, allowing them to maintain their structural integrity even in extreme temperatures, such as intense heat or freezing cold. Overall, special steel is a reliable and durable material that excels in challenging weather environments.

Q: How does special steel perform in terms of corrosion resistance?: Special steel performs exceptionally well in terms of corrosion resistance. It is specifically designed and engineered to have enhanced resistance against corrosion compared to standard steel. This is achieved through various alloying elements and specific heat treatment processes that create a protective barrier against corrosive elements such as moisture, chemicals, and atmospheric conditions. As a result, special steel exhibits excellent durability and longevity even in corrosive environments, making it a preferred choice in industries where corrosion resistance is crucial, such as marine, oil and gas, and chemical industries.

Q: What are the main applications of special steel in the power transmission industry?: Special steel is widely used in the power transmission industry for various applications. One of the main applications is in the manufacturing of power transmission components such as gears, shafts, and couplings, where special steel's high strength and durability are essential for transmitting power efficiently. Additionally, special steel is also used in the construction of power transmission towers and poles, providing structural integrity and resistance against harsh environmental conditions. Overall, the main applications of special steel in the power transmission industry revolve around its ability to enhance performance, reliability, and longevity of power transmission systems.

Q: Can special steel be used in high-speed applications?: Indeed, special steel can be utilized in high-speed applications without a doubt. Special steel encompasses a variety of steel alloys that have been intentionally developed and engineered to possess enhanced properties like exceptional strength, durability, and resistance to wear and corrosion. These properties render special steel appropriate for a wide range of demanding applications, including those involving high speeds. In high-speed applications, such as aerospace, automotive, machining, and power generation, the material must endure extreme conditions, including elevated temperatures, vibrations, and mechanical stress. Special steel is purposefully designed to meet these requirements and deliver outstanding performance even in the face of such challenging circumstances. For instance, high-speed steel (HSS) is a specific type of special steel formulated to retain its hardness and strength at high temperatures, which makes it ideal for cutting tools like drills, end mills, and saw blades. Similarly, stainless steel variants like martensitic and precipitation-hardening stainless steels are frequently employed in high-speed applications due to their exceptional strength, toughness, and resistance to corrosion. Furthermore, the advancement of cutting-edge manufacturing techniques, such as powder metallurgy, has facilitated the production of special steel with even superior properties, including higher hardness, improved wear resistance, and enhanced dimensional stability. These advancements have further expanded the range of applications for special steel in high-speed industries. To summarize, special steel is a versatile and dependable material that can be effectively utilized in high-speed applications. Its unique properties make it suitable for withstanding demanding conditions and delivering excellent performance, which is why it is the preferred choice for industries that require materials capable of enduring high speeds, temperatures, and mechanical stress.

Q: How is special steel made?: Special steel undergoes a complex and precise manufacturing process, consisting of various steps. Initially, high-quality raw materials like iron ore and scrap metal are carefully chosen and then melted in a furnace at extremely high temperatures. This procedure eliminates impurities and forms molten steel. Once the molten steel is obtained, it is further refined to achieve the desired composition and properties. This is accomplished by adding various alloying elements like chromium, nickel, manganese, and vanadium. These elements enhance the steel's strength, hardness, corrosion resistance, and other specific characteristics necessary for the intended application. Following that, the molten steel is cast into different shapes, such as bars, slabs, or billets, using a process called casting. During casting, the steel is poured into molds and allowed to cool and solidify. The resulting solidified steel is then processed further using techniques like rolling, forging, or extrusion to achieve the desired shape and dimensions. After shaping, the steel undergoes heat treatment, which involves controlled heating and cooling processes. Heat treatment refines the steel's microstructure, improving its mechanical properties. This can involve processes like quenching, tempering, annealing, or normalizing, depending on specific requirements. Finally, the steel is subjected to thorough testing and quality control measures to ensure compliance with required specifications and standards. These tests encompass mechanical, chemical, and physical analyses, as well as non-destructive testing techniques, to verify the integrity and performance of the special steel. In summary, the production of special steel is a highly technical and specialized process that entails meticulous selection of raw materials, precise alloying, casting, shaping, heat treatment, and rigorous quality control. The end result is a steel with exceptional properties that can be tailored to meet the specific needs of diverse industries, including automotive, aerospace, construction, or manufacturing.

Q: What are the different casting grades of special steel?: Special steel is a type of steel that is specially designed to possess specific exceptional properties, making it suitable for specialized applications. Within the realm of special steel, various casting grades are available, each with its own unique characteristics and uses. One commonly used casting grade of special steel is stainless steel, which contains a high percentage of chromium, giving it excellent corrosion resistance properties. It is extensively utilized in applications where resistance to oxidation, acids, and other corrosive elements is crucial, such as in the manufacturing of kitchen utensils, medical instruments, and chemical processing equipment. Another casting grade of special steel is tool steel, specifically formulated to exhibit exceptional hardness, wear resistance, and toughness. It is commonly employed in the production of cutting tools, dies, molds, and other tools that require high strength and durability. High-speed steel is an important casting grade of special steel, known for its exceptional heat resistance and ability to maintain hardness even at high temperatures. It finds widespread use in the production of cutting tools like drills, taps, and milling cutters, where the material is exposed to high temperatures generated during the cutting process. Moreover, there are casting grades of special steel specifically designed for use in extreme temperature environments. These grades, such as heat-resistant steel, are formulated to retain their strength and integrity even at elevated temperatures. Heat-resistant steel is commonly used in applications such as furnace components, exhaust systems, and gas turbines. In conclusion, the various casting grades of special steel offer a wide range of properties and applications. Stainless steel provides excellent corrosion resistance, tool steel offers exceptional hardness and toughness, high-speed steel is known for its heat resistance, and heat-resistant steel is designed to withstand extreme temperatures. These grades of special steel play a crucial role in various industries where specific applications require exceptional properties.

Q: How does special steel contribute to the overall strength and durability of structures?: Several factors contribute to the overall strength and durability of structures, and special steel is one such factor. Firstly, the manufacturing process of special steel involves incorporating specific alloying elements that enhance its mechanical properties. This leads to an increase in tensile strength and hardness, enabling the steel to withstand higher loads and pressures. Consequently, the structural integrity of buildings and infrastructures is ensured. Additionally, special steel is renowned for its remarkable resistance against corrosion. This is particularly significant for structures that are exposed to harsh environmental conditions or come into contact with corrosive substances. By preventing rust and degradation, special steel significantly prolongs the lifespan of structures. As a result, maintenance costs are reduced, and the need for frequent repairs or replacements is minimized. Furthermore, the unique properties of special steel enable the creation of streamlined and lightweight structures. Its high strength-to-weight ratio empowers architects and engineers to design structures with thinner sections and reduced material usage, all while maintaining the necessary strength. This not only saves costs but also reduces the environmental impact associated with construction. Moreover, special steel exhibits exceptional toughness and impact resistance. This makes it highly resistant to fractures or buckling when subjected to extreme loads or dynamic forces. This property is particularly crucial for structures that face seismic events, heavy vibrations, or impacts, as it guarantees the safety and stability of the building or infrastructure. In conclusion, special steel plays a critical role in enhancing the overall strength and durability of structures. Its unique mechanical properties, corrosion resistance, lightweight nature, and high toughness all contribute to the longevity, safety, and cost-effectiveness of buildings and infrastructures.

Q: How does tool steel maintain its hardness at high temperatures?: Tool steel maintains its hardness at high temperatures primarily due to its high carbon content and the presence of other alloying elements. The carbon in tool steel forms hard and wear-resistant carbides, which help retain hardness even at elevated temperatures. Additionally, alloying elements such as chromium, tungsten, molybdenum, and vanadium contribute to the formation of secondary carbides, which further enhance the steel's resistance to softening and maintain its hardness under high heat conditions.

Send your message to us

*Email

*TEL

*Quantity

*Unit