Invar alloy, also known as invar alloy, is an alloy with iron as the main component. It contains about 36% nickel and small amounts of elements such as chromium, silicon, manganese, etc. This alloy exhibits a very low coefficient of expansion at low temperatures, so it is widely used in the manufacture of precision instruments and devices that require dimensional stability under temperature changes.
The density of the Invar alloy is about 82 grams of cubic centimeters, about twice as much as iron. It has a low thermal conductivity of about 142w (m·k), which means it transfers heat more slowly. In addition, Invar alloys have a high modulus of elasticity and a low coefficient of thermal expansion. These properties make Invar an ideal material for the manufacture of a wide range of precision parts and equipment, especially in aerospace, electronics, instrument manufacturing, and other fields.
Invar is an alloy steel with a low coefficient of expansion, which is mainly used in the manufacture of precision instruments and equipment that need to maintain dimensional stability under temperature changes. Similar to Invar alloys, Invar also has a lower coefficient of thermal expansion and a higher modulus of elasticity. However, Invar's ** is less expensive than Invar, making Invar an alternative to Invar in some cost-sensitive applications.
The machining characteristics of Invar alloys include good machinability and weldability. It can be easily machined into parts of various shapes and sizes by cutting, and it can be joined by welding. In addition, Invar alloy also has good corrosion resistance and can remain stable in various environments.
For LNG ships that require the use of Invar alloys, there are a number of requirements that need to be met. First of all, the Invar alloy must be able to withstand extremely low temperatures and maintain a stable size and shape under temperature changes. In addition, Invar alloy must have good corrosion resistance and high strength to ensure the safety and reliability of LNG vessels. At the same time, the ** of Invar alloy also needs to be relatively low to meet the needs of large-scale manufacturing.
The coefficient of thermal expansion and modulus of elasticity of Invar alloys are among the most important physical properties. A lower coefficient of thermal expansion allows it to maintain a stable size and shape under temperature changes, while a higher modulus of elasticity improves its ability to withstand pressure. These properties make Invar alloys ideal materials for manufacturing various precision parts and equipment, especially in aerospace, electronics, instrument manufacturing and other fields.
The difference between invar alloy grades depends mainly on their composition and use. For example, Invar36 is a commonly used grade that contains about 36% nickel and small amounts of chromium, silicon, manganese, etc. Due to its low coefficient of thermal expansion and high modulus of elasticity, this grade of Invar alloy is widely used in a variety of applications that require high-precision dimensional stability.
Overall, Invar alloy is a very important material with a wide range of application prospects. It can be used to manufacture a variety of precision parts and equipment, especially in fields that require high-precision dimensional stability. With the continuous development of science and technology, the application field of Invar alloy will continue to expand, and its role in industrial production and scientific and technological progress will become more and more important.