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alok sharma
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what is semi killed and fully killed steel.
Semi killed steel is a type of steel that has a partial deoxidation during the steelmaking process, leaving some oxygen present in the final product. Fully killed steel, on the other hand, undergoes a complete deoxidation process, removing all oxygen from the steel. This results in a more uniform and refined microstructure, making fully killed steel stronger and more ductile than semi killed steel.
The presence of oxygen in steel can lead to various issues such as porosity, low ductility, and poor surface finish. By using semi killed or fully killed steel, these issues can be minimized, resulting in a higher quality and more consistent product. Additionally, fully killed steel is often required for applications that require high strength and low ductility, such as structural steel used in construction.
The process for producing semi killed or fully killed steel involves adding deoxidizing agents such as silicon, aluminum, or manganese to the steel during the steelmaking process. These agents react with the oxygen present in the steel, removing it from the final product. The amount of deoxidizing agents added determines whether the steel will be semi killed or fully killed.
The main advantage of using semi killed steel is its lower cost, as less deoxidizing agents are required during the steelmaking process. However, semi killed steel may have lower strength and ductility compared to fully killed steel. Fully killed steel, on the other hand, has a more uniform and refined microstructure, resulting in higher strength and ductility. However, it is typically more costly to produce.
Semi killed and fully killed steel can both be used for a wide range of applications, depending on the specific properties and requirements of the steel. Semi killed steel is often used for structural applications such as bridges and buildings, while fully killed steel is commonly used for high-strength applications such as pressure vessels and pipelines. Ultimately, the choice between semi killed and fully killed steel depends on the specific needs and specifications of the application.