Alloys such as phosphorous copper, beryllium copper or manganese copper which reduce the oxygen content and oxides, respectively, when added to molten metal (see Deoxidation). They bond free oxygen thus preventing gas blisters from being formed and alloying elements from being oxidized.

In practice, deoxidation with only one metal is very rare. Al and/or Mn and/or Si are usually added because using several deoxidizers at the same time significantly enhances the deoxidation effect.

The oxygen dissolved in molten steel, for example, causes negative properties after solidification such as brittleness, susceptibility to cracking, pitting corrosion and insufficient machineability. sdf deoxidation Moreover, molten steel contains iron oxide (FeO) after refining which must be removed in order to avoid the risk of red shortness. Manganese, for example, can be used as deoxidizer for this purpose; however the reaction product manganese oxide (MnO) enters the slag. More suitable as dexodizers are silicon, calcium-silicon,calcium carbide, silicon-calcium-manganese or aluminum in particular in the form of special aluminum alloys containing iron, manganese and silicon.

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