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Effect of Submicron-Carbon-Containing MgO-C Refractories on Carbon Pickup of Ultra-Low Carbon Steel
Y. Liu1,2, L. Wang2, G. Li1,2,3, Z. Zhang2, X. Xu1, Y. Li1, J. Chen1
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
3 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China
received October 30, 2017, received in revised form December 19, 2017, accepted January 29, 2018
Vol. 9, No. 2, Pages 141-148 DOI: 10.4416/JCST2017-00087
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.
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Keywords
Submicron carbon, MgO-C refractories, carbon pickup, penetration, spalling resistance
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