Killed carbon steel意思

"Killed carbon steel" is a term used in metallurgy and the steel industry to describe a type of steel that has been thermally treated to reduce its carbon content and prevent the formation of carbides during solidification. This process is also known as "killing" the steel.

When molten steel is poured into molds to cool and solidify, the carbon present in the steel can form carbides, which are compounds of carbon and iron. These carbides can cause the steel to have a non-uniform structure and can make it more prone to cracking and other defects.

To prevent this, killed carbon steel is treated by holding the molten steel at a specific temperature for a certain period of time before it is cast. This allows the carbon to diffuse into the iron and form a more uniform structure. The steel is then cooled very slowly to room temperature, which further helps to prevent the formation of carbides.

Killed carbon steel is often used in applications where a uniform and consistent structure is important, such as in the production of steel plates, bars, and structural shapes. It is also used in the manufacture of parts that are subject to high stress or that require a certain level of toughness and ductility.