Special Steel 42CrMo/1.7225/4140 High Carbon 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
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Item specifice
Type:
Alloy Steel
Shape:
Steel Sheet
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(%)
| C | Si | Mn | Cr | Mo | Ni | P | S |
| 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.20 | 0.15-0.25 | ≤0.030 | ≤0.030 | ≤0.030 |
Standard
| GB | AISI | DIN | JIS | ISO |
| 42CrMo | 4140 | 42CrMo4 | SCM440 | 42CrMo4 |
Available Size
| Rolled round bar | φ20-120mm × L |
| Forged round bar | φ130-195mm × L |
Heat Treatment
| Item | Temperature℃ | Hardness |
| quenching | 840-880 | HRC32-34 |
| tempering | 580 | |
| quenching | 900 | HRC54-60 |
| tempering | 150-180 |
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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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 does quenching and tempering affect the hardness of special steel?
- Quenching and tempering significantly impact the hardness of special steel. Quenching involves rapidly cooling the steel from a high temperature, which results in a hard and brittle structure. On the other hand, tempering involves reheating the quenched steel to a specific temperature and then cooling it slowly, which reduces the brittleness and increases the toughness of the steel while maintaining a desired level of hardness. Overall, this heat treatment process modifies the microstructure of the steel, leading to a controlled increase in hardness while improving its mechanical properties.
- Q:What is the impact of carburizing on the properties of special steel?
- Carburizing, also known as case hardening, is a heat treatment process that involves introducing carbon into the surface layer of special steel. This process has a significant impact on the properties of the steel, enhancing its hardness, wear resistance, and strength. One of the main effects of carburizing is the formation of a hard outer layer, known as the case, which is rich in carbon. The diffusion of carbon atoms into the steel matrix during carburizing increases the carbon content at the surface, resulting in a higher hardness compared to the core. This hardened case provides excellent resistance against wear, abrasion, and surface fatigue, making it well-suited for applications that require high durability, such as gears, camshafts, and bearings. Additionally, carburizing enhances the strength of the steel, as the increased carbon content improves the material's ability to form martensite, a hard, crystalline structure. This martensitic transformation further contributes to the hardness and strength of the carburized steel, making it suitable for applications that require high load-bearing capacity, such as shafts and axles. Furthermore, carburizing can improve the fatigue resistance of special steel. The hardened case formed during carburizing helps to distribute stress more evenly across the surface, reducing the likelihood of crack initiation and propagation. This increased resistance to fatigue failure makes carburized steel suitable for components subjected to cyclic loading, such as gears and springs. However, it is important to note that carburizing can also have some drawbacks. The increased carbon content at the surface can lead to reduced ductility and toughness, making the material more prone to brittle fracture. To mitigate this issue, it is common to use a lower carbon content steel for the core, ensuring a balance between hardness and toughness. In conclusion, carburizing has a significant impact on the properties of special steel. It enhances hardness, wear resistance, and strength, making it suitable for applications that require durability, high load-bearing capacity, and fatigue resistance. However, the process should be carefully controlled to maintain a balance between hardness and toughness, ensuring the material's overall performance and reliability.
- Q:How is special steel used in the aerospace industry?
- Special steel is used in the aerospace industry for various applications due to its exceptional strength, durability, and resistance to extreme temperatures. It is commonly utilized in the manufacturing of aircraft structures, engine components, landing gear, and fasteners. The high strength-to-weight ratio of special steel enables the construction of lightweight yet robust parts, contributing to improved fuel efficiency and aircraft performance. Additionally, its ability to withstand harsh environmental conditions and maintain structural integrity makes it indispensable for ensuring the safety and reliability of aerospace systems.
- Q:What are the challenges in working with special steel?
- When it comes to working with special steel, there are several distinct challenges that set it apart from regular steel. Let's take a look at some of the main difficulties one might encounter in this field: 1. Expensive nature: Special steels often come with higher production costs due to their unique composition and properties. The raw materials used in their production may be scarce or require intricate manufacturing processes, resulting in increased expenses. 2. Limited availability: Special steels are not as readily accessible as regular steels, making it more arduous to source them. This limited availability can lead to longer lead times and potentially higher costs when attempting to obtain the necessary materials. 3. Machining complexity: Special steels can prove challenging to machine due to their elevated hardness or toughness. Their distinctive properties may cause excessive tool wear, resulting in increased machining time and costs. Overcoming these challenges may necessitate the use of specialized cutting tools and machining techniques. 4. Heat treatment requirements: Achieving the desired mechanical properties of special steels often demands precise and specific heat treatment processes. The complexity of heat treatment lies in the careful control of temperature, time, and cooling rates. Improper heat treatment can result in inconsistent material properties or even material failure. 5. Welding difficulties: In comparison to regular steels, certain special steels may exhibit poor weldability. They may be prone to cracking or require preheating and post-weld heat treatment to ensure proper joint integrity. This can introduce complexity and cost to welding processes. 6. Corrosion susceptibility: While special steels may possess excellent mechanical properties, they can sometimes be more vulnerable to corrosion when compared to regular steels. This necessitates additional measures to protect the steel from corrosion, such as applying protective coatings or utilizing corrosion-resistant alloys. 7. Knowledge and expertise requirements: Working with special steels typically demands a higher level of technical knowledge and expertise. The unique properties and characteristics of these materials necessitate a deep understanding of their behavior and effective handling. This may call for specialized training or collaboration with experts in the field. Despite these challenges, working with special steel also offers various benefits, including superior strength, durability, and performance in specific applications. By comprehending and addressing these challenges, engineers and manufacturers can leverage the unique properties of special steel to develop innovative and high-quality products.
- Q:What are the properties of high-speed tool steel?
- High-speed tool steel possesses excellent hardness, wear resistance, and high hot hardness, allowing it to withstand high temperatures and maintain its sharpness even when subjected to intense heat during cutting or shaping processes. It also exhibits good toughness and the ability to retain its cutting edge, making it suitable for various machining applications. Additionally, high-speed tool steel has good machinability, enabling it to be easily shaped and formed into desired tool designs.
- Q:What are the different methods for improving the creep resistance of special steel?
- There are several methods for improving the creep resistance of special steel. One approach is through alloying, where elements such as chromium, molybdenum, and tungsten are added to enhance the strength and stability of the steel at high temperatures. Another method is by heat treatment, which involves controlled heating and cooling processes to optimize the microstructure of the steel and improve its creep resistance. Additionally, surface treatments like carburizing or nitriding can be applied to increase the hardness and wear resistance of the steel, thereby improving its creep resistance. Lastly, proper design and engineering considerations, such as using thicker sections or incorporating reinforcements, can also contribute to enhancing the creep resistance of special steel.
- Q:What are the requirements for special steel used in aerospace defense applications?
- Due to the critical nature of aerospace defense applications, the demands for special steel are highly rigorous. The steel must meet several key requirements: 1. Exceptional strength is necessary to withstand extreme conditions and loads, ensuring the structural integrity of aircraft and defense equipment. 2. The steel must have excellent corrosion resistance to combat the harsh environments it encounters, such as moisture, saltwater, and chemicals. This prevents degradation and maintains performance over time. 3. Withstanding high temperatures without compromising mechanical properties is crucial for components operating in high-temperature environments, like jet engines and rocket nozzles. 4. Fatigue resistance is essential as aerospace defense applications involve repeated stress cycles. The steel should be able to resist fatigue failure, ensuring long service lives without failure. 5. Weight reduction is a critical factor to enhance fuel efficiency, payload capacity, and overall performance. The special steel must have a high strength-to-weight ratio, allowing for lighter structures without compromising strength. 6. To ensure reliability and longevity in demanding operational conditions, the steel used must have a high level of purity and cleanliness, minimizing the presence of impurities and defects. 7. Compatibility with other materials, such as aluminum alloys and composite materials commonly used in aerospace defense applications, is essential for reliable and efficient integration of different components and structures. Meeting these requirements often involves utilizing advanced manufacturing techniques such as vacuum melting, precise alloying, and heat treatment processes. Additionally, strict quality control measures, including non-destructive testing and material certification, are crucial to guarantee the performance and reliability of special steel in aerospace defense applications.
- Q:How does special steel perform in case hardening applications?
- Special steel performs exceptionally well in case hardening applications. Case hardening is a heat treatment process used to increase the surface hardness of a material while maintaining a tough and ductile core. Special steel, also known as alloy steel, is specifically formulated to have enhanced properties such as high strength, toughness, and wear resistance. In case hardening applications, special steel is ideal due to its ability to form a hard outer layer while retaining its core properties. The process typically involves heating the steel to a specific temperature and then introducing a carbon-rich environment, such as through carburizing or carbonitriding. The carbon atoms diffuse into the steel's surface, creating a high-carbon layer, known as the case, which significantly increases hardness and wear resistance. Special steel's high carbon content allows for deeper and more uniform case hardening compared to other types of steel. This results in improved durability, reduced friction, and enhanced resistance to wear, abrasion, and impact. The tough core of special steel also ensures that the material remains resistant to cracking or fracturing under high stress or impact loads. Additionally, special steel offers excellent machinability, allowing for ease of processing during case hardening applications. This makes it a preferred choice for various industries, including automotive, aerospace, tooling, and manufacturing, where components require both high surface hardness and structural integrity. Overall, special steel is highly regarded for its exceptional performance in case hardening applications. Its combination of high strength, toughness, wear resistance, and machinability makes it an excellent choice for producing durable and reliable components that can withstand demanding operating conditions.
- Q:Can special steel be used in the electronics industry?
- Yes, special steel can be used in the electronics industry. It is commonly used for various components such as connectors, springs, and contacts due to its high strength, corrosion resistance, and electrical conductivity properties.
- Q:What are the different joining methods for special steel?
- There are several different joining methods for special steel, including welding, brazing, soldering, and mechanical fastening. Each method has its own advantages and considerations depending on the specific requirements of the application. Welding is commonly used for joining thick sections of steel and offers high strength and durability. Brazing and soldering involve melting a filler material to bond the steel pieces together at lower temperatures, making them suitable for joining thin or delicate components. Mechanical fastening methods, such as bolts, nuts, and rivets, provide a non-permanent joining solution and are often used in applications that require disassembly or reassembly.
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Special Steel 42CrMo/1.7225/4140 High Carbon 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
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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