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Ferroniobium

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Ferroniobium 

a ferroalloy consisting of approximately 60 percent Nb (or Nb + Ta), 10–12.5 percent Si, 2–6 percent Al, and 3–8 percent Ti (Fe and impurities constituting the remainder). Ferroniobium is produced through electric-furnace aluminothermy using pyrochlore concentrate or technical niobium pentoxide. It is used in the smelting of structural steel and heatresistant alloys.
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If increase of titanium content in ferroalloy enables reduction of its density and melting point of the alloy changes insignificantly [8], in melting of ferrovanadium, ferroniobium and ferromolybdenum sharp increase of temperature of alloys is observed as content of the main alloying element increases, which causes reduction of the pool dimensions and need to reduce optimum mass of the metal being remolten.
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