Method of making ultra low-carbon steel

Details Method of making ultra low-carbon steel Method of making ultra low-carbon steel

C - Chemistry, Metallurgy

21

C

C21C 7/06 (2006.01) C21D 8/04 (2006.01) C22C 38/14 (2006.01)

Patent

CA 2195369

Adding aluminum and/or silica to molten steel after decarburization containing about 0.005 percent by weight or less of carbon and about 1.0 percent by weight or less of manganese to form a mildly deoxidized molten steel; adding titanium to the mildly deoxidized molten steel to continue deoxidation so that the molten steel contains about 0.005 percent by weight or less of aluminum, about 0.20 percent by weight or less of silicon and about 0.01 to 0.10 percent by weight of titanium, to form inclusions in the molten steel which essentially consist of a complex oxide of titanium and aluminum, a complex oxide of titanium and silicon, and/or a complex oxide of titanium, aluminum and silicon.

n ajoute de l'aluminium et (ou) de la silice à de l'acier fondu décarburé renfermant environ 0,005 % (en poids) ou moins de carbone et environ 1,0 % (en poids) ou moins de manganèse pour produire de l'acier fondu légèrement désoxydé; avec l'ajout de titane à cet acier fondu légèrement désoxydé, la désoxydation se poursuit, si bien que l'acier fondu renferme quelque 0,005 % (en poids) ou moins d'aluminium, environ 0,20 % (en poids) ou moins de silicium et environ 0,01 à 0,10 % (en poids) de titane et il se forme dans l'acier fondu des inclusions consistant essentiellement en un complexe d'oxyde de titane et d'aluminium, un complexe d'oxyde de titane et de silicium et (ou) un complexe d'oxyde de titane, d'aluminium et de silicium.

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