Invar 36 round bar is a specialized form of the nickel-iron alloy known as Invar 36, renowned for its low coefficient of thermal expansion (CTE) and exceptional dimensional stability over a wide temperature range. In this article, we’ll explore what Invar 36 round bar is, its composition, properties, and various types available in the market.
What is Invar 36 Round Bar?
Invar 36 round bar is a cylindrical metal bar made from Invar 36 alloy. Invar 36 is composed primarily of nickel (around 36%) and iron, with small amounts of cobalt and other elements. The addition of specific alloying elements results in its unique properties, particularly its low CTE, which makes it virtually insensitive to changes in temperature.
Composition of Invar 36 Alloy
Invar 36 alloy typically consists of the following composition:
- Nickel (Ni): Approximately 36%
- Iron (Fe): Remaining balance
- Cobalt (Co): Small amounts (usually less than 0.5%)
- Other trace elements: Including carbon, manganese, silicon, and sulfur
This precise composition gives Invar 36 its unique combination of thermal and mechanical properties, making it suitable for a variety of precision engineering applications.
Properties of Invar Round Bar
Invar round bar exhibits several key properties that make it highly desirable in engineering and manufacturing:
Low Coefficient of Thermal Expansion (CTE): Invar 36 has an exceptionally low CTE, typically around 1.2 × 10^-6/°C (at 20-100°C), making it ideal for applications requiring dimensional stability over a wide temperature range.
Excellent Dimensional Stability: Invar 36 maintains its shape and dimensions even when subjected to temperature variations, thermal cycling, and mechanical stress. This property is crucial for applications requiring precise tolerances and minimal distortion.
Good Machinability: Invar 36 round bar offers good machinability, allowing for ease of cutting, drilling, milling, and turning. However, its unique properties require specific machining techniques to achieve optimal results.
Types of Invar 36 Round Bar
Invar 36 round bar is available in various types and forms to suit different applications and manufacturing requirements:
Standard Round Bar: This is the most common type of Invar 36 round bar, available in standard diameters and lengths. It is used in a wide range of precision engineering applications where dimensional stability is critical.
Precision Ground Bar: Precision ground Invar 36 round bar undergoes additional processing to achieve tight dimensional tolerances and smooth surface finishes. It is often used in applications requiring precise machining and dimensional control.
Hollow Bar: Invar 36 hollow bar is characterized by its hollow cylindrical shape, with a through-hole running along its length. It is used in applications where weight reduction and fluid flow are essential, such as in aerospace and automotive components.
Custom Shapes: Invar 36 round bar can be custom-machined or forged into various shapes and profiles to meet specific design requirements. Custom shapes are often used in specialized applications where standard round bar sizes are not suitable. To buy Invar 36 round ba contact here.
Conclusion
Invar 36 round bar is a versatile material known for its exceptional dimensional stability and low coefficient of thermal expansion. With its precise composition and unique properties, it finds applications in a wide range of industries, including aerospace, electronics, precision engineering, and scientific research. Understanding the composition, properties, and types of Invar 36 round bar is essential for selecting the right material for various engineering and manufacturing applications.
