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Effect of Submicron-Carbon-Containing MgO-C Refractories on Carbon Pickup of Ultra-Low Carbon Steel

Y. Liu, Y. Liu, L. Wang, G. Li, G. Li, G. Li, Z. Zhang, X. Xu, Y. Li, J. Chen

Journal of Ceramic Science and Technology, Vol. 9, No. 2 (2018), pp. 141-148

DOI: 10.4416/JCST2017-00087

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Abstract

To reduce the carbon pickup of ultralow-carbon steel, the interaction between liquid steel and MgO-C refractories containing submicron carbon at 1600 °C was studied under laboratory conditions and compared with interaction of liquid steel with conventional MgO-C refractories containing flaky graphite. The results show that the carbon pickup in steel is provided by the spalling refractories, the penetration layer and the reaction of Al in steel with CO, which is generated from the reaction between MgO and C in refractories. The carbon supplied by spalling refractories might play a dominant role in the carbon pickup of steel. The reaction between Al in steel and CO is not the main cause of carbon pickup. In the test with conventional MgO-C refractories, carbon pickup became more severe with increasing content of flaky graphite. In the test with MgO-C refractories containing submicron carbon, the carbon pickup decreased with increasing submicron-carbon content, which is attributed to the thinner penetration layer and better spalling resistance. The application of MgO-C refractories containing submicron carbon could be favourable for the manufacture of ultralow-carbon steel with high cleanliness.

Keywords

Submicron carbon, MgO-C refractories, carbon pickup, penetration, spalling resistance

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