• Special Steel  AISI 4140 Round Bar Steel System 1
  • Special Steel  AISI 4140 Round Bar Steel System 2
  • Special Steel  AISI 4140 Round Bar Steel System 3
Special Steel  AISI 4140 Round Bar Steel

Special Steel AISI 4140 Round Bar 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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Item specifice

Type:
Alloy Steel
Shape:
Steel Round Bar
Standard:
AISI,JIS,GB,BS,DIN,API,EN,ASTM
Thickness:
as required
Technique:
Hot Rolled,Cold Rolled,Cold Drawn,ERW,Forged,Extruded,EFW,Spring
Shape:
U Channel,Square,C Channel,Hexagonal,Round
Surface Treatment:
Galvanized,Coated,Copper Coated,Color Coated,Oiled,Dry,Chromed Passivation,Polished,Bright,Black,PVDF Coated
Steel Grade:
Q195,Q215,Q235,Q215B,Q235B,RHB335,HRB400,200 Series,300 Series,400 Series,600 Series,SS400-SS490,10#,20#,A53(A,B)
Certification:
ISO,SGS,BV,IBR,RoHS,CE,API,BSI,UL
Length:
as required
Net Weight:
as required

Chemical Composition(%)

CSiMnCrMoNiPS
0.38-0.450.17-0.370.50-0.800.90-1.200.15-0.25≤0.030≤0.030≤0.030

 

Standard

GBAISIDINJISISO
42CrMo414042CrMo4SCM44042CrMo4

 

Available Size

Rolled round barφ20-120mm × L
Forged round barφ130-195mm × L

 

Heat Treatment

ItemTemperature℃Hardness
quenching840-880HRC32-34
tempering580
quenching900HRC54-60
tempering150-180

 

Characterstics

The steel with high strength and toughness, hardenability is better also
After conditioning treatment quenching deformation of small 
high fatigue limit and repeated impact resistance

 

Applications:  The steel is suitable for manufacturing requires a certain strength and toughness of large and medium-sized plastic mold


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Special Steel  AISI 4140 Round Bar Steel

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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.

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     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 are cobalt-based alloys used in dental applications?
Cobalt-based alloys are commonly used in dental applications due to their excellent mechanical properties, corrosion resistance, and biocompatibility. They are used in dental prosthetics, such as crowns, bridges, and dentures, as well as in dental implants. These alloys provide high strength and durability, ensuring long-lasting dental restorations. Additionally, their biocompatibility ensures that they do not cause any adverse reactions in the oral environment.
Q:How does aluminum contribute to the properties of special steel?
Special steel commonly incorporates aluminum as an alloying element to bolster its properties. The addition of aluminum yields multiple enhancements. Firstly, the inclusion of aluminum elevates the strength of the steel by creating a fine dispersion of aluminum nitride particles within the steel matrix. These particles act as barriers that impede dislocation movement, hindering steel deformation and amplifying its strength. Consequently, the steel becomes more resistant to mechanical stresses, thereby augmenting its load-bearing capacity. Secondly, aluminum also boosts the steel's corrosion resistance. It forms a protective oxide layer on the steel's surface, acting as a barrier against corrosive agents. This oxide layer prevents the steel from oxidizing, rusting, and deteriorating over time, thereby rendering it more durable and long-lasting in various environments. Moreover, aluminum can enhance the machinability of special steel. Its presence in the steel composition reduces the steel's tendency to work harden during machining operations. Consequently, cutting, drilling, or shaping the steel becomes easier, resulting in improved productivity and reduced tool wear. Furthermore, aluminum contributes to the heat resistance of special steel. With its high melting point and excellent thermal conductivity, aluminum aids in maintaining the steel's structural integrity at elevated temperatures. This renders aluminum-steel alloys suitable for applications demanding high-temperature resistance, such as those in the aerospace and automotive industries. In conclusion, aluminum plays a significant role in enhancing the properties of special steel. It bolsters strength, corrosion resistance, machinability, and heat resistance, making it a versatile material applicable in various fields.
Q:What is the composition of special steel?
Special steel is a type of steel that is alloyed with various elements to enhance its specific properties, such as increased strength, corrosion resistance, or heat resistance. The composition of special steel can vary depending on the desired characteristics, but it commonly includes elements like chromium, nickel, molybdenum, vanadium, and tungsten, among others. These alloying elements contribute to the unique properties and performance of special steel in various industries, including automotive, aerospace, and construction.
Q:What are the different classifications of special steel?
There are several classifications of special steel, including stainless steel, tool steel, high-speed steel, alloy steel, and carbon steel.
Q:How does special steel contribute to weight reduction in manufacturing?
Special steel, engineered specifically for various manufacturing applications, possesses certain characteristics that make it suitable. One major advantage of special steel is its ability to reduce weight in manufacturing processes. Industries that prioritize weight reduction, such as automotive, aerospace, and construction, often utilize special steel. This is because special steel has a high strength-to-weight ratio, meaning it can provide the necessary strength and performance while being lighter compared to other materials. Using special steel allows companies to achieve weight reduction in multiple ways. Firstly, the lightweight nature of special steel enables the production of significantly lighter components and structures compared to conventional materials. This reduction in weight offers several benefits, including improved fuel efficiency in automobiles, increased payload capacity in aircraft, and easier handling and installation in construction projects. Moreover, special steel's high strength-to-weight ratio allows manufacturers to design and produce thinner yet equally strong components. This not only reduces overall weight but also optimizes material usage, leading to cost savings and a more sustainable manufacturing process. Additionally, special steel's unique properties, such as excellent formability and weldability, facilitate the creation of complex and intricate designs that further contribute to weight reduction. This versatility enables the production of lightweight components with intricate shapes and structures, enhancing overall performance and functionality. In conclusion, special steel is crucial in reducing weight during manufacturing processes. Its high strength-to-weight ratio, lightweight nature, excellent formability, and weldability enable the production of lighter components and structures. By utilizing special steel, industries can achieve improved efficiency, performance, and sustainability in their manufacturing operations.
Q:How does special steel contribute to the manufacturing of cutting blades for industrial machines?
Due to its unique properties and composition, special steel plays a vital role in the production of cutting blades for industrial machines. The exceptional hardness of special steel is crucial for cutting blades to withstand the high pressure and abrasion experienced during industrial cutting operations. This hardness ensures that the blades remain sharp for extended periods, reducing the need for frequent replacement and minimizing downtime in manufacturing processes. In addition, special steel offers remarkable toughness, enabling cutting blades to endure heavy loads without chipping or breaking. This is especially important in industrial settings where cutting blades face intense forces and must maintain their integrity to ensure efficient and reliable cutting operations. Furthermore, special steel exhibits excellent resistance to corrosion and wear, making it an ideal material for cutting blades used in harsh environments involving chemicals, extreme temperatures, or abrasive materials. This corrosion resistance prolongs the lifespan of the cutting blades, reducing maintenance costs and improving overall productivity. Moreover, special steel can be customized to meet specific requirements, allowing for the manufacturing of cutting blades with precise dimensions, shapes, and cutting angles. This customization ensures that the blades are tailored to the unique needs of different industrial machines and applications, optimizing cutting performance and efficiency. In conclusion, special steel greatly contributes to the manufacturing of cutting blades for industrial machines by providing outstanding hardness, toughness, corrosion resistance, and customization options. These properties enhance the durability, reliability, and efficiency of cutting operations, ultimately leading to improved productivity and reduced costs in industrial manufacturing processes.
Q:How is special steel used in the production of automotive springs?
Automotive springs, including suspension springs and valve springs, require special steel due to its unique properties that make it perfect for this purpose. Special steel, also called alloy steel, is specifically designed to have superior mechanical properties compared to regular steel. By adding alloying elements like chromium, nickel, or molybdenum, its strength, hardness, and resistance to wear and fatigue are improved. When it comes to producing automotive springs, special steel is used to create springs capable of withstanding the demanding conditions of the vehicle's suspension system. These springs must not only absorb and distribute the vehicle's weight but also provide a smooth and comfortable ride. The exceptional strength of special steel allows automotive springs to handle heavy loads without deforming or breaking. This is crucial for maintaining vehicle stability and safety, especially on rough roads or when carrying heavy loads. Furthermore, special steel's fatigue resistance is vital in the production of automotive springs. Over the vehicle's lifespan, these springs undergo millions of compression and expansion cycles. The fatigue resistance of special steel ensures that the springs can maintain their performance and reliability over an extended period. Moreover, special steel's resistance to wear and corrosion is highly advantageous in automotive applications. Springs are exposed to various environmental elements like moisture, dirt, and chemicals, which can cause corrosion and deterioration. The corrosion resistance of special steel helps prolong the lifespan of automotive springs and maintains their functionality. In conclusion, the use of special steel in manufacturing automotive springs guarantees that these crucial components can endure heavy loads, repetitive stress, and high temperatures. Its superior mechanical properties, including strength, fatigue resistance, and corrosion resistance, make it the ideal material for automotive springs, enhancing the overall performance and durability of vehicles.
Q:Can special steel be used in the rubber manufacturing industry?
Yes, special steel can be used in the rubber manufacturing industry. It is commonly used for making molds, dies, and other components that are used in the production process of rubber products. Special steel provides durability, strength, and resistance to wear, which are essential properties required in the rubber manufacturing industry.
Q:What are the main challenges in machining special steel?
One of the main challenges in machining special steel is its high hardness, which makes it difficult to cut and shape. Special steels often have high levels of carbon or other alloying elements, making them tough and resistant to wear, but also more challenging to machine. These materials require specialized cutting tools and techniques to ensure efficient and accurate machining. Additionally, special steels can generate high heat during machining, leading to thermal stress and potential distortion of the workpiece. Proper cooling and lubrication are crucial to overcome these challenges and achieve desired machining outcomes.

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