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| Effect of Magnesium on Morphology of NonMetallic Inclusions in X120Pipeline Steel |
| LI Taiquan,BAO Yanping, LIU Jianhua,WANG Min |
| University of Science and Technology Beijing, Beijing 10083, China |
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Abstract The precipitation of nonmetallic inclusions containing magnesium was calculated thermodynamically in X120 melt.When 0.00046%<w(［Mg］)< 0.0033% and w(［Al］)=0.025%，inclusion of MgO·A12O3 was formed.When w(［Mg］) > 0.0033%,MgO inclusion was formed. While w(［Ti］)=0.016% and w(［Mg］)=00008%,2MgO·Ti2O3 was formed.The experiment showed that all the inclusions in X120 steel treated with magnesium contained magnesium, they were much finer than that in steel treated with calcium,of which 85% were smaller than 2 μm in size; 145% were in the range of 25 μm,and 05% were in the range of 510 μm, and there was no inclusion larger than 10 μm.
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Received: 01 January 1900
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2008, Vol. 43 
