Steel treated with a strong deoxidizer to reduce oxygen to a level where no reaction occurs between carbon and oxygen during solidification.
Steel to which sufficient deoxidizing agents have been added to prevent gas evolution during solidification. LAP-A surface defect appearing as a seam caused from folding over hot metal, fins, or sharp corners and then rolling or forging, without welding them into the surface.
The term indicates that the steel has been completely deoxidized by the addition of an agent such as silicon or aluminum, before casting, so that there is practically no evolution of gas during solidification. Killed steels are characterized by a high degree of chemical homogeneity and freedom from porosity.
steel deoxidized with aluminum or silicon to reduce gas content and refine grain size
Steel that is deoxidized by silicon or aluminum to reduce the oxygen content in the molten steel to a minimum prior to solidification of the metal. Killed steels have more uniform properties and chemical composition than other types.
Steel which has been treated in the molten state with silicon and/or deoxidizers such as aluminum to reduce the oxygen content of the molten steel to a minimum. This treatment quiets the metal and permits it to densify during solidification. All steels used in the manufacture of flanges and fittings are made.
Steel deoxidized with a strong deoxidizing agent, such as silicon or aluminum, to reduce the oxygen content to such a level that no reaction occurs between carbon and oxygen during solidification.
Has sufficient deoxidizing agent added to remove all free oxygen. Internal gas voids are thus avoided.
Molten steel held in a ladle, furnace, or crucible (and usually treated with aluminum, silicon, or manganese) until more gas is evolved and the metal is perfectly quiet. See Crucible, Ladle.