A method for stable control of oxidation of ultra-low carbon steel top slag
A technology of stable control, ultra-low carbon steel, applied in the direction of manufacturing converters, etc., can solve the problems of not fully considering the oxygen transfer in the steel, the influence of the modification effect of the top slag, and the control of the tundish top slag oxidation.
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Embodiment 1
[0054] (1) The final temperature of the converter for this heat is 1670°C, the carbon content at the final point is 0.05%, and the oxygen at the final point is 0.041%. During the tapping process of the converter, no deoxidizer and slagging material are added, and the ladle is not stirred with argon;
[0055] (2) after tapping finishes, the amount of slag under the ladle is 2.3t, and the TFe content is 18% in the converter slag, and the amount of steel tapping is 270t, calculate aluminum slag, lime addition according to formula 1, formula 2, be respectively 840kg, 570kg.
[0056] (3) After the converter is tapped, start blowing argon to stir at the bottom, the argon flow rate is 300L / min, start to add lime and aluminum slag, stop the bottom blowing and stir after feeding, so that the top slag modifier of the ladle is evenly spread in the The liquid level of the ladle, the oxygen content in the steel is reduced to 0.030% after modification;
[0057] (4) When RH blows oxygen to ...
Embodiment 2
[0062] (1) The final temperature of the converter for this furnace is 1675°C, the carbon content at the final point is 0.045%, and the oxygen at the final point is 0.045%. During the tapping process of the converter, no deoxidizer and slagging material are added, and the ladle is not stirred with argon;
[0063] (2) After tapping, the amount of slag discharged from the ladle is 2.2t, the TFe content in the converter slag is 18.5%, and the amount of tapping is 270t. According to Formula 1 and Formula 2, the amount of aluminum slag and lime added is calculated to be 885kg and 615kg respectively.
[0064] (3) After the converter is tapped, start blowing argon to stir at the bottom, the argon flow rate is 400L / min, start to add lime and aluminum slag, stop the bottom blowing and stir after feeding, so that the top slag modifier of the ladle is evenly spread in the Ladle liquid level, the oxygen content in the steel is reduced to 0.028% after modification;
[0065] (4) When RH blo...
Embodiment 3
[0070] (1) The end point temperature of the converter for this furnace is 1680°C, the end point carbon content is 0.025%, and the end point oxygen is 0.045%. No deoxidizer and slagging material are added during the tapping process of the converter, and the ladle is not turned on for argon stirring;
[0071] (2) After tapping, the amount of slag discharged from the ladle is 2.0t, the TFe content in the converter slag is 17.7%, and the amount of tapping is 270t. According to Formula 1 and Formula 2, the amount of aluminum slag and lime added is calculated to be 965kg and 690kg respectively.
[0072] (3) After the converter is tapped, start blowing argon to stir at the bottom, the argon flow rate is 450L / min, start to add lime and aluminum slag, stop the bottom blowing and stir after feeding, so that the top slag modifier of the ladle is evenly spread on the top of the ladle Ladle liquid level, the oxygen content in the steel is reduced to 0.026% after modification;
[0073] (4)...
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