20Cr Alloy Steel Bar Forged or Hot Rolled
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25 m.t.
- Supply Capability:
- 50000 m.t./month
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Specification
Type:
Alloy Steel
Shape:
Steel Round Bar
20Cr Alloy Steel Bar Forged or Hot Rolled
Product Description:
Grade: ASTM 1020 / 20Cr
State:hot forging+normalizing+turning
Size:90mm to 1500mm
Length:4 to 6 meter or according to request
Billet:EAF+LF+VD
Straightness:≤4mm/m(black), ≤2mm/m(turning)
OD Tolerance:-0/+8mm(black),-0/+3 mm(turning)
Grain Fineness:ASTM E112-96 > Level 5 or better under annealing state;
Non Metallic Inclusion:ASTM E45 A/B/C/D heavy ≤2, thin ≤2.5
Test:SEP1921 CLASS C/C,D/d,E/e;GB/T 6402-91;GB/T6402-2008/ASTM A388/ASTM A709
MTC:EN 10204-3.1/EN10204-3.2 RONA/BV/SGS Certificate
Lead Time:30 to 60 days after order confirmed
Chemical composition:
Grade | C | Cr | Mn | Si | P | S | Ni | Cu | Mo |
≤ | |||||||||
20Cr | 0.18-0.24 | 0.70-1.00 | 0.50-0.80 | 0.17-0.37 | 0.035 | 0.035 | 0.30 | 0.30 | 0.15 |
Features and Use scope:
It has higer intensity and hardenability than 15Cr,worse toughness ,better weldability ,after welding it don't need to heat treatment.It used to making the parts which have special request in intensity of core and the larger-size appearance can bear abrasion ,or cementite parts of complex shape and seldom burthen ,such as gear , gear shaft ,cam, gudgeon pin ,worm and so on ,it also used to making tempering parts of big speed and can bear middle impact load.
Product Show:
- Q: What is the role of cobalt in special steel?
- Cobalt plays a crucial role in special steel as it acts as a stabilizing element, improving the steel's strength, toughness, and resistance to corrosion and wear. It also helps in retaining the steel's magnetic properties, making it suitable for applications in the aerospace, automotive, and energy sectors.
- Q: What are the limitations of special steel in certain applications?
- Special steel, although highly versatile and durable, does have certain limitations in certain applications. One limitation of special steel is its high cost. Special steel is typically more expensive to produce compared to regular steel due to the addition of various alloying elements. This can make it less economically viable for certain applications where cost is a significant factor, especially in large-scale projects or industries with tight budgets. Another limitation is its susceptibility to corrosion. While special steel is generally more resistant to corrosion compared to regular steel, it is still not completely immune to the effects of corrosion. In environments with high levels of moisture, chemicals, or extreme temperatures, special steel may still corrode over time if not properly protected or maintained. Special steel also has limitations in terms of formability and workability. Due to its higher strength and hardness, special steel can be more challenging to shape, bend, or weld compared to regular steel. This can limit its use in applications that require complex or intricate designs, as well as those that involve extensive fabrication or assembly processes. Furthermore, special steel may have certain limitations in terms of availability and supply chain. Not all types of special steel may be readily available in the market, especially in remote or less developed regions. This can make it difficult to source the required special steel for specific applications, leading to potential delays or compromises in project execution. Lastly, the specialized properties of special steel may not always be necessary or advantageous for certain applications. In some cases, regular steel or alternative materials may be more suitable and cost-effective, especially if the specific properties of special steel are not required for the intended use. Overall, while special steel offers numerous benefits and advantages, it is important to consider its limitations in certain applications. Careful evaluation of the specific requirements, cost-effectiveness, and availability of special steel is essential to ensure its successful and optimal use in any given situation.
- Q: What are the challenges in machining high-speed special steel?
- Several challenges arise when machining high-speed special steel due to its unique properties and characteristics. Its extreme hardness presents one of the main obstacles, making cutting and shaping difficult. High-speed special steel typically has a high carbon content and undergoes heat treatment to enhance its hardness, resulting in increased wear on cutting tools. The increased hardness of this steel also leads to elevated heat generation during the machining process. This heat can cause thermal distortion and impact the dimensional accuracy of the final product. To counteract this, specialized cooling techniques and cutting tools with advanced coatings must be used to dissipate heat and maintain stability. Another challenge is the brittleness of high-speed special steel. It tends to have low toughness and is susceptible to cracking and chipping during machining operations. To minimize the risk of tool failure and excessive stress, careful selection of cutting parameters such as cutting speed, feed rate, and depth of cut is necessary. Furthermore, high-speed special steel often contains alloying elements like tungsten, vanadium, and cobalt, which can further complicate the machining process. While these elements increase the strength and wear resistance of the steel, they also make it more challenging to machine. Effective machining of these alloys and achieving desired surface finishes requires specialized tool materials and cutting strategies. Additionally, the cost of high-speed special steel is often significantly higher than that of conventional steels, adding to the challenges of machining. The high tooling costs associated with the cutting tools required for machining this steel can be a substantial investment. Overall, machining high-speed special steel necessitates advanced cutting techniques, specialized tooling, and careful consideration of cutting parameters to overcome the challenges posed by its extreme hardness, brittleness, and alloying elements.
- Q: How does special steel perform in terms of wear resistance?
- Special steel performs exceptionally well in terms of wear resistance. It is specifically engineered to withstand abrasive forces, making it highly durable and long-lasting even in demanding environments. The unique composition and heat treatment processes used in its production enhance its hardness, toughness, and ability to resist wear, ensuring that it can withstand friction, impact, and other forms of wear and tear with minimal degradation.
- Q: What are the applications of special steel in aerospace engineering?
- Special steel is widely used in aerospace engineering for various applications. It is used to manufacture critical components such as turbine blades, landing gear, and structural parts that require high strength, toughness, and resistance to extreme temperatures. Special steel alloys, such as stainless steel and nickel-based alloys, are used due to their excellent corrosion resistance, heat resistance, and ability to withstand harsh environments. These materials ensure the safety and reliability of aircraft, enabling them to operate under demanding conditions and meet stringent performance requirements.
- Q: How does the heat treatment process affect the properties of special steel?
- The properties of special steel are greatly affected by the heat treatment process. This process involves controlled heating and cooling of the steel to modify its microstructure and, as a result, its mechanical properties. To begin, heat treatment can increase the hardness of special steel. By heating the steel to a specific temperature and then rapidly cooling it through quenching, the steel undergoes a phase transformation that boosts its hardness. This is especially advantageous for applications that demand high strength and resistance to wear, such as cutting tools or bearings. Furthermore, heat treatment can enhance the toughness of special steel. By tempering the quenched steel at a lower temperature, the brittleness caused by rapid cooling can be minimized, leading to improved toughness and ability to withstand impacts. This is crucial in applications where the steel must endure sudden shocks or impacts, like in automotive or aerospace components. Moreover, heat treatment can also improve the overall strength of special steel. Through a combination of heating, cooling, and tempering processes, the steel's grain structure can be refined, resulting in increased strength and resistance to deformation. This is particularly critical for structural applications where the steel must withstand heavy loads or extreme conditions. Additionally, the heat treatment process can influence the corrosion resistance of special steel. By subjecting the steel to specific heat treatment cycles, the formation of certain phases or chemical compounds can be encouraged, leading to enhanced resistance against corrosion or oxidation. This is essential for applications exposed to harsh environments or corrosive substances, such as in marine or chemical industries. In conclusion, the heat treatment process is essential in modifying the properties of special steel. By carefully controlling the heating, cooling, and tempering cycles, the hardness, toughness, strength, and corrosion resistance of the steel can be significantly improved. This allows for the production of special steel with customized properties to meet the specific requirements of various industrial applications.
- Q: What are the main factors affecting the machinability of special steel?
- Several key factors influence the machinability of special steel, which refers to its ease of cutting, shaping, and forming. 1. The chemical composition of special steel plays a crucial role in its machinability. Elements like carbon, chromium, nickel, and molybdenum can significantly impact the material's hardness, toughness, and cutting properties. For instance, higher carbon content can increase steel's hardness, making it more difficult to machine. 2. The hardness of special steel is a critical factor in determining its machinability. Harder steels require more cutting force and generate more heat during machining, leading to increased tool wear and reduced efficiency. On the other hand, softer steels are generally easier to machine but may result in lower tool life. 3. The heat treatment process applied to special steel can greatly influence its machinability. Treatments like annealing, tempering, or quenching can alter the steel's microstructure and mechanical properties, affecting how it responds to cutting forces. Proper heat treatment can improve machinability by reducing hardness and increasing toughness. 4. The size and distribution of grains within the steel also impact its machinability. Fine-grained steel tends to have better machinability compared to coarse-grained steel, as smaller grains offer more uniform cutting conditions and reduce the risk of tool damage. 5. Machining parameters, including cutting speed and feed rate, directly affect the machinability of special steel. Higher cutting speeds can increase tool wear and generate excessive heat, affecting surface finish and dimensional accuracy. Similarly, incorrect feed rates can cause chip formation problems, resulting in poor machinability. 6. The choice of cutting tool material and geometry is crucial for achieving optimal machinability. Different tool materials, like carbide or high-speed steel, have varying wear resistance and cutting properties. The tool geometry, including rake angle and clearance angle, also affects chip formation, cutting forces, and heat generation. 7. Adequate lubrication and cooling during machining are essential to enhance machinability. Lubricants or coolants help reduce friction and heat, prolong tool life, and improve chip evacuation. Additionally, they prevent workpiece deformation and improve surface finish. Considering these factors, it is important to carefully select the appropriate special steel grade, optimize machining parameters, and use suitable cutting tools and lubrication to achieve the desired machinability and maximize productivity.
- Q: What are the different carburizing techniques used for special steel?
- There are several carburizing techniques used for special steel, including pack carburizing, gas carburizing, and vacuum carburizing. Pack carburizing involves placing the steel in a container with a carbon-rich material, such as charcoal or coke, and heating it to high temperatures. Gas carburizing involves introducing a carbon-rich gas, such as methane or propane, into a furnace where the steel is heated. Vacuum carburizing utilizes a low-pressure atmosphere to introduce carbon into the steel at high temperatures. Each technique has its own advantages and is chosen based on factors such as desired depth of carburization, time constraints, and the type of steel being treated.
- Q: What are the different chemical processing grades of special steel?
- There are several different chemical processing grades of special steel, including stainless steel, tool steel, high-speed steel, and alloy steel.
- Q: How does special steel perform in renewable energy applications?
- Special steel is a key component in various renewable energy applications and plays a significant role in their performance and durability. The unique properties of special steel, such as its high strength, corrosion resistance, and temperature stability, make it an ideal choice for use in renewable energy technologies. One of the major renewable energy applications where special steel excels is in wind turbines. Wind turbine components, such as the tower, rotor blades, and gearbox, require materials that can withstand harsh environmental conditions and high mechanical loads. Special steel alloys offer excellent strength-to-weight ratios, allowing for lighter and more efficient turbine designs. Additionally, their corrosion resistance properties ensure longevity and reduced maintenance requirements, resulting in increased reliability and overall performance of the wind turbine. In solar power applications, special steel is used in the construction of solar panels and support structures. Solar panels require frames made of durable material to withstand external forces and extreme weather conditions. By utilizing special steel, solar panels can be manufactured to be lightweight, yet strong enough to support the weight of the photovoltaic cells. Furthermore, the corrosion resistance of special steel ensures that the panels remain intact, even in harsh environments. Moreover, special steel is also employed in the production of hydroelectric power. In hydro turbines, the corrosive nature of water and the high pressure and temperature conditions necessitate the use of materials that can withstand such environments. Special steel offers excellent resistance to corrosion, erosion, and cavitation, making it a reliable choice for hydroelectric power generation. Its strength and durability ensure the turbines can operate efficiently and withstand the forces exerted by the flowing water. Overall, special steel performs exceptionally well in renewable energy applications by enhancing the reliability, longevity, and efficiency of various technologies. Its unique properties make it an indispensable material in wind turbines, solar panels, and hydroelectric power generation, contributing to the overall advancement and sustainability of renewable energy systems.
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20Cr Alloy Steel Bar Forged or Hot Rolled
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25 m.t.
- Supply Capability:
- 50000 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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