Inland Steel Company

Larry A Frank

Howard M Pielet

Daniel Rellis, Jr

John R Knoepke

Debanshu Bhattacharya

Purnendu K Dasgupta

Charles R Jackson

Milan Alavanja

William Edgar

The dissolved oxygen content in a bath of molten steel is controlled, in one embodiment, by diluting a slag layer atop the bath with an oxide such as lime (CaO), to reduce the percentage of MnO and FeO in the slag, and stirring the bath of molten steel. In another embodiment, a gaseous mixture of an inert gas and carbon monoxide is disequilibrium with the carbon and dissolved oxygen content is bubbled through the bath.

Steel product with globular manganese sulfide inclusions

Molten steel containing an undissolved alloying ingredient denser than molten steel (e.g. Pb and/or Bi) flows from a tundish to a continuous casting mold. Various expedients are employed to prevent large globules of undissolved alloying ingredient from flowing out of the tundish into the mold. Another expedient prevents large quantities of undissolved alloying ingredient from accumulating on the bottom of the tundish.

Apparatus for preventing undissolved alloying ingredient from entering

Preventing undissolved alloying ingredient from entering continuous

Controlling dissolved oxygen content in molten steel

An alloying ingredient is added to molten steel entering the tundish in a continuous casting process. The concentration of the alloying ingredient is maintained substantially uniform throughout the cast by exercising certain controls. Small scale, short term variations in the mass flow rates of the alloying ingredient and molten steel and in the recovery of the alloying ingredient are attenuated by employing a system having certain characteristics.

Method for controlling uniformity of alloy content in continuously cast

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Crown Point, IN, United States of America

Larry A Frank