The act or process of reducing from the state of an oxide.
Elimination of oxygen in liquid steel, usually by introduction of aluminum or silicon or other suitable element. This term is also used to denote reduction of surface scale (iron oxide).
The practice of adding elements to liquid steel before it is cast to reduce and control the level of dissolved oxygen in the liquid and therefore to control the amount of carbon monoxide evolved during solidification. Elements added for this purpose are Mn, Si and Al. Modern casting practice requires the complete removal of gaseous oxygen before casting commences; this steel is 'fully killed'.