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| Non-Metallic Inclusions in RH Refining Process |
| ZHANG Zhong-zheng1，LIN Yang2，SHANG De-li3，L Chun-feng3，KANG Lei3，LIAO Xiang-wei3 |
（1．Product Manufacturing Department，Angang Steel Co．， Ltd．， Anshan 114021， Liaoning， China
2．Central Steelmaking Plant，Angang Steel Co．， Ltd．， Anshan 114021， Liaoning， China
3．Technical Center，Angang Steel Co．， Ltd．， Anshan 114009， Liaoning， China） |
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Abstract A water model with linear scale 1∶5 for a 200t ladle RH unit was established．The effect of blow rate in up-gas tube in real process condition on slag entrapment was analyzed to get optimizing process parameters．The results show that with blow rate120m3/h in up-gas tube，slag entrapment occurs smoothly and evenly．According to the result of water model，the industrial tests on RH unit using premelted slag were carried out．After sampling in each process，the amount，size distribution and morphology of inclusions in non-oriented silicon steel with/without pre-molten refining slag treatment were studied by metalloscope，image analytical meter and scan electron microscope．The results show that pre-molten refining slag treatment makes the amount and size of inclusions decrease and Al2O3 change to CaO-MgO-A12O3 compound inclusions in RH metallurgical treatment．
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Received: 23 May 2013
Published: 28 April 2014
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2014, Vol. 49 
