Overview of Physical Properties of 800H Nickel Iron Chromium Alloy

introduction

With the widespread application of high-temperature alloy materials in the industrial field, 800H nickel iron chromium alloy, as an alloy material with excellent high-temperature resistance, is increasingly favored by the industry. It plays an important role in industries such as aerospace, energy, and chemical engineering, especially in environments that require heat resistance and corrosion resistance. 800H alloy demonstrates extremely high reliability and stability due to its unique physical properties. This article will provide a detailed overview of the physical properties of 800H nickel iron chromium alloy, helping industry professionals to gain a deeper understanding of its key properties and explore its potential in future technologies and markets.

1. Composition and basic characteristics of 800H nickel iron chromium alloy

800H nickel iron chromium alloy belongs to iron-based alloys, with the main elements including nickel (Ni), chromium (Cr), and iron (Fe). Specifically, 800H alloy typically contains 32% -34% chromium, 20% -23% nickel, and approximately 40% -50% iron. It also contains small amounts of elements such as molybdenum (Mo) and silicon (Si), which endow the alloy with excellent corrosion resistance, heat resistance, and oxidation resistance.

physical property 

The physical properties of 800H alloy are very suitable for high-temperature environments. Here are some key physical performance indicators:

Density: The density of 800H alloy is usually between 7.9-8.0 g/cm ³, which is a common range of metal material densities to ensure its stability at high temperatures.

Melting point: The melting point of 800H alloy is about 1370 ° C. Its higher melting point allows it to maintain stable physical properties in high-temperature working environments, without melting or performance degradation due to excessive temperature.

Coefficient of thermal expansion: This alloy has a low coefficient of thermal expansion, which can effectively reduce the mechanical stress caused by thermal expansion during temperature changes.

Thermal conductivity: The thermal conductivity of 800H alloy is moderate, which can balance the conduction and blocking of thermal energy under high temperature conditions, avoiding rapid temperature rise or excessive heat dissipation.

2. High temperature resistance of 800H nickel iron chromium alloy

High temperature oxidation resistance

One of the most prominent features of 800H alloy is its excellent high temperature and oxidation resistance. At high temperatures, a dense oxide film can form on the surface of the alloy to protect the alloy substrate from further oxidation. The high content of chromium plays a crucial role in this process, as it not only prevents oxidation of the alloy matrix, but also enhances the stability of the alloy in extreme environments. 800H alloy can be used for a long time at temperatures up to 900 ° C or even higher, especially suitable for high-temperature working conditions such as gas turbines and heat exchangers.

Hot corrosion and chemical resistance

800H alloy has excellent corrosion resistance to various chemical media, especially in corrosive environments such as chlorides and sulfides, exhibiting very high corrosion resistance. For example, in the fertilizer industry and petroleum refining processes, 800H alloy is commonly used to withstand harsh environments such as acidic gases and corrosive liquids. This makes it widely used in fields that require high corrosion resistance.