METHOD OF MELTING NIOBIUM-CONTAINING STEEL

FIELD: ferrous metallurgy; making low-carbon steels by means of vacuum oxidizing refining units. ^ SUBSTANCE: proposed method includes loading the charge containing carbon and manganese, melting, heating the metal in steel-making unit and oxidation refining at top blowing with oxygen and evacuation....

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Bibliographische Detailangaben
Hauptverfasser:	NIKOLAEV O.A, SARYCHEV A.F, STEPANOVA A.A, PAVLOV V.V, BODJAEV JU.A, IVIN JU.A, KORNEEV V.M, MOROZOV A.A, TAKHAUTDINOV R.S
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	CHEMISTRY METALLURGY METALLURGY OF IRON PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Beschreibung
Zusammenfassung:	FIELD: ferrous metallurgy; making low-carbon steels by means of vacuum oxidizing refining units. ^ SUBSTANCE: proposed method includes loading the charge containing carbon and manganese, melting, heating the metal in steel-making unit and oxidation refining at top blowing with oxygen and evacuation. Niobium-containing ferroalloy is introduced into metal after evacuation in form on niobium-containing powder wire at the following relationship: Qp.w.Nb=100xQst x(0.288-0.018x(Mn)-10.178x(C)+8.989x[Nb]req./[Nb]p.w., where Qp.w.Nb is consumption of powder wire ferroniobium filler (by filler), kg; Qst is mass of molten steel, t: (Mn), (C) content of manganese and carbon in sample of metal before introduction of powder wire with ferroniobium, %; [Nb]req. is required content of niobium in steel, %; [Nb]p.w. is content of niobium in powder wire, %. ^ EFFECT: increased yield of good material; enhanced stability of steel teeming ladles. ^ 1 ex