deoxidizer


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deoxidizer

(dē-ok′sĭ-dīz″ĕr) [ deoxidizer + oxidize]
An agent that removes oxygen.
References in periodicals archive ?
The foundry focused on eliminating the problems caused by higher aluminum additions so that a higher concentrated final deoxidizer could be used.
In the STS-refining process, calcium oxide included in a slag layer and aluminum, which is used as a deoxidizer, made a high-temperature melt reaction to create a CaO-[Al.sub.2][O.sub.3] compound, of which the main crystal phase consists of 12CaO*7[Al.sub.2][O.sub.3] and 3CaO*[Al.sub.2][O.sub.3].
Dependences of silicon and manganese melting loss upon content of carbon at the furnace outlet (Figure 2, a) and changes of carbon content in the ladle-furnace (Figure 2, b) showed that the fuller was decarbonization of metal in the ladle-furnace, the lower was melting loss of deoxidizers.
Unburned cokes, which are deoxidizers, also exist in molten iron, and most of the unburned cokes are incorporated into the slag layer.
It requires the use of chemical additives (anti-grease agents, concentrated detergents, anti-corrosives, deoxidizers, etc.).
Also, consider using filler wire with added deoxidizers to clean the weld.
The inclusions in molten steel are primarily composed of various deoxidizers such as FeSi, Al, and SiMn and refining agents such as Ca[F.sub.2] and NaCl, which are oxidized to [Al.sub.2][O.sub.3], Si[O.sub.2], MnO, [Al.sub.2][O.sub.3]-Si[O.sub.2]-MnO, and Ca compounds during smelting.
Classified under AWS A5.18 E70C-6M H4, the Metalloy 76 is a versatile, all-purpose wire that can be used in spray, short arc, or pulsed processes, and contains added deoxidizers that let it tolerate mill scale and other surface contaminants better than most other wires.
By means of change of activities of the deoxidizers in course of deoxidation of molten steel and during solidification of the metal, crystallization and solid-phase reactions of formation of oxide phases occur in certain areas of phase equilibriums of the CaO-MgO-[Al.sub.2][O.sub.3]-Si[O.sub.2] system.
In addition, application of this steel is limited by very strict requirements in regard to content of phosphorus and sulfur ([less than or equal to] 0.02% for each element), which causes the need of prolonging both oxidation and reduction periods of melting, practically complete removal of phosphorus slag prior to the refining, increase of consumption of deoxidizers, lime and fluxes, and taking other technological measures.