| Customization: | Available |
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| Application: | Aviation, Electronics, Industrial, Medical, Chemical |
| Standard: | JIS, GB, DIN, BS, ASTM, AISI |
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A "Cr20Ni80" bar typically refers to a type of resistance heating alloy, also known as Nichrome 80/20. It is composed of approximately 80% nickel (Ni) and 20% chromium (Cr), hence the name. This alloy is commonly used in applications requiring high electrical resistance, such as heating elements in electric furnaces, toasters, and hair dryers.
The composition of Cr20Ni80 is as follows:
This alloy has excellent resistance to oxidation and corrosion at high temperatures, making it suitable for use in harsh environments. It also exhibits good electrical resistivity, ensuring efficient conversion of electrical energy into heat. Cr20Ni80 bars are available in various forms, including round bars, wires, and strips, to accommodate different manufacturing requirements and applications.
| Performance\ material | Cr10Ni90 | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 | |
| Composition | Ni | 90 | Rest | Rest | 55.0-61.0 | 34.0-37.0 | 30.0-34.0 |
| Cr | 10 | 20.0-23.0 | 28.0-31.0 | 15.0-18.0 | 18.0-21.0 | 18.0-21.0 | |
| Fe | ≤1.0 | ≤1.0 | Rest | Rest | Rest | ||
| Maximum temperatureºC | 1300 | 1200 | 1250 | 1150 | 1100 | 1100 | |
| Meltiing point ºC | 1400 | 1400 | 1380 | 1390 | 1390 | 1390 | |
| Density g/cm3 | 8.7 | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 | |
| Resistivity(μΩ·m,20ºC) | 1.09±0.05 | 1.18±0.05 | 1.12±0.05 | 1.00±0.05 | 1.04±0.05 | ||
| Elongation at rupture | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | |
| Specific heat (J/g.ºC) | 0.44 | 0.461 | 0.494 | 0.5 | 0.5 | ||
| Thermal conductivity(KJ/m.hºC) | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 | ||
| Coefficient of lines expansion | 18 | 17 | 17 | 19 | 19 | ||
| a×10-6/ºC (20~1000ºC) | |||||||
| Micrographic structure | Austenite | Austenite | Austenite | Austenite | Austenite | ||
| Magnetic properties | Non | Non | Non | Weak | Weak | ||
| magnetic | magnetic | magnetic | magnetic | magnetic | |||
Application:
Heating Elements: Cr20Ni80 rods are commonly used in various heating applications, including:
Resistance Heating: They are employed in resistance heating applications where controlled heat generation is required, such as in automotive industry processes, laboratory equipment, and thermal processing systems.
Raw Material Preparation: The process begins with sourcing high-quality raw materials, primarily nickel, chromium, and other alloying elements like iron, molybdenum, and titanium. These materials are carefully selected to meet the desired chemical composition and quality standards.
Melting: The raw materials are melted together in a controlled environment, often in an electric arc furnace or vacuum induction furnace. The melting process ensures thorough mixing and homogenization of the alloying elements to achieve the desired chemical composition.
Casting or Forming: Once the alloy is molten and properly mixed, it is cast into an initial form. For rod production, this typically involves continuous casting or pouring the molten metal into molds to form billets or ingots of the desired size and shape.
Hot Working: The cast billets or ingots are then subjected to hot working processes such as rolling or extrusion. During hot working, the material is deformed at elevated temperatures to reduce its cross-section and elongate it into the desired rod shape. This process helps refine the microstructure of the alloy and improve its mechanical properties.
Cold Working (Optional): Depending on the desired properties and dimensions, the hot-worked rods may undergo additional cold working processes such as drawing or cold rolling. Cold working further refines the microstructure, increases the strength, and achieves the desired dimensions with tight tolerances.
Heat Treatment: After forming and shaping, the Inconel 690 rods may undergo heat treatment to optimize their mechanical properties and enhance their performance at high temperatures. Heat treatment processes may include annealing, solution annealing, or aging treatments, depending on the specific requirements of the application.
Surface Finishing: Once the rods have been formed and heat-treated, they undergo surface finishing processes to achieve the desired surface quality and appearance. This may include polishing, grinding, or chemical treatments to remove surface defects and improve surface finish.
Quality Control: Throughout the production process, rigorous quality control measures are implemented to ensure that the Inconel 690 rods meet the specified dimensional, mechanical, and chemical requirements. This includes inspections, testing, and certifications to verify compliance with industry standards and customer specifications.
Packaging and Shipping: Finally, the finished rods are carefully packaged to protect them during transportation and storage. They are then shipped to customers or distributors for further processing or direct use in various industrial applications.
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