What are different types of killed steel?
steel, which was treated with an oxidation agent to tie the oxygen molecules that are present in molten steel, are called killed steel. Carbon dioxide in molten steel creates bubbles when it cools the steel, which has harmful effects on many steel properties. By adding an oxidizer, such as aluminum, silicon or vanadium, oxygen atoms in molten steel are bound to oxidative to carbon bubbles and carbon dioxide bubbles. This results in thicker steel without bubbles. Almost any type of steel can be killed, but the intended use generally determines whether this process will be subjected to a specific steel.
Deoxidization of a particular steel can improve many of its properties, especially hardness and chemical homogeneity, which means that the killed steel tends to be more consistent in terms of chemical makeup and molecular structure in a certain sample than in non-mixed steel with the same formula. The killed stúhoř will be thicker than the same steel that is not killed due to the absence of gas Bublin. For this reason, many types of steel are treated in this way, although not all applications require killed steel. For example, some steels used for casting are not killed, because the killed steel tends to show a higher degree of shrinking than non -healing steel, which can cause problems with cast parts.
High carbon steels, 0.25% or more are almost always killed, as well as steels with a carbon content between 0.15% and 0.25%, which are used as structural steels. The killed steel tends to be stronger and also heavier than non -healing steel, and therefore structural steels are deoxidated. Some lower carbon steels are also killed depending on the intended use.
stainless steels are almost always killed steels. The presence of free oxygen or carbon dioxide molecules can lead to oxidation of the steel itself, which is exposed to rust. Stainless steel is as definedDestination against oxidation. Although this resistance to oxidation is mainly the function of additives to the steel alloy, the process of deoxidation improves this quality even more.
6 Bubbles that are formed in non -healing steels can cause weak points and structural defects in steel. They are also usually treated with steel to be thermally killed.