High temperature alloy steel
High temperature alloy steel is a kind of special alloy steel material that is used in environments with high temperatures. It is composed of alloy elements, such as chromium, molybdenum, tungsten, nickel, vanadium, and titanium, which can significantly improve the overall performance of the steel material, such as creep strength, corrosion resistance, and high temperature oxidation resistance. Therefore, high temperature alloy steel is widely used in many fields such as aerospace, petrochemical, boiler and pressure vessels.
Generally speaking, high temperature alloy steel contains chrome, molybdenum, tungsten, vanadium, niobium and cobalt, etc. These elements can significantly improve the mechanical properties of the steel and extend its service life. At the same time, due to the wear-resistant performance of the high temperature alloy steel, it is often used as metal wear-resistant parts.
In terms of manufacturing methods, martensitic, austenitic, ferritic and bainite are mainly used to make high temperature alloy steel. The martensite tempering temperature of high temperature alloy steel is lower, which can improve the impact toughness of steel, increase the hardness of steel, and is more suitable for large plastic deformation.
The austenite has good corrosion resistance and oxidation resistance. The barite is a combination of ferrite and various carbides, which is mainly used to make wear-resistant parts and components. The bainite has good wear resistance and high temperature oxidation resistance, and is mostly used to make parts used at high temperature.
In terms of application, high temperature alloy steel is mainly used in the manufacture of turbine blades, blades, casings and other parts of modern engines. It is also widely used in petrochemical refineries, petrochemical boilers, turbines, and so on. In the aerospace industry, it is mainly used for aircraft engine blades, combustion chambers, and so on.
In addition, high temperature alloy steel is also widely used in the field of power production, such as high temperature flue gas desulphurization facilities. The heat exchanger of aerospace, land and marine marine vehicles, sealing devices, power station boilers and so on all need to use high temperature alloy steel.
High temperature alloy steel has a wide range of uses, so it has certain requirements for the performance parameters such as strength, hardness, toughness and wear resistance. Therefore, alloy steel manufacturers must pay attention to the proportion of alloy elements, control certain process parameters, and select the appropriate manufacturing process in order to obtain the desired performance parameters.
