石油套管钢中镁铝尖晶石的形成与改性

方忠强; 孙彦辉; 张西超; 汪成义

doi:10.7513/j.issn.1004-7638.2014.05.024

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石油套管钢中镁铝尖晶石的形成与改性

doi: 10.7513/j.issn.1004-7638.2014.05.024

北京科技大学冶金学院, 北京 100083

基金项目:

国家自然科学基金 (51274032) 资助项目

详细信息

作者简介:
方忠强 (1987-), 男, 新疆塔城人, 博士生, 主要从事钢液精炼与夹杂物控制研究

中图分类号: TF769.2
计量
- 文章访问数: 151
- HTML全文浏览量: 53
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2013-12-26

Formation and Modification of MgO·Al₂O₃ Spinel in Oil Casing Steel

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 通过石油套管钢的工业试验及热力学分析,研究精炼过程中镁铝尖晶石的形成和改性机理。结果表明:当钢液中溶解铝分别为0.02%和0.05%时,溶解镁只要达到1.5×10^-6和2.8×10^-6,钢中便有镁铝尖晶石生成;钢液中溶解铝0.02%,镁含量为4×10^-6~8×10^-6时,钢中溶解钙含量只要分别达到0.21×10^-6和0.42×10^-6,钢液中的镁铝尖晶石便开始向液态钙铝酸盐转变;镁铝尖晶石比氧化铝更容易改性为液态夹杂物;钢液精炼过程中夹杂物受钢渣反应和钙处理的影响,按照Al₂O₃→MgO-Al₂O₃系夹杂物→CaO-Al₂O₃-MgO或CaO-Al₂O₃系液态复合夹杂物的过程演变。
- 石油套管钢 /
- 镁铝尖晶石 /
- 夹杂物 /
- 热力学计算 /
- 演变机理
Abstract: The formation and modification mechanism of MgO·Al₂O₃ spinel in oil casing steel during secondary refining process was studied by industrial experiments and thermodynamic calculations.The results show that when dissolved Al are 0.02% and 0.05% respectively,the required amount of dissolved Mg for the formation of MgO·Al₂O₃ spinel are 1.5×10^-6and 2.8×10^-6accordingly.For molten steel with 0.02% dissolved Al,When the dissolved Mg ranges from 4×10^-6to 8×10^-6,MgO·Al₂O₃ inclusions would transform into CaO-Al₂O₃-MgO system inclusions under dissolved Ca content of 0.21×10^-6and 0.42×10^-6 respectively.MgO·Al₂O₃ spinel inclusions could be easier modified than Al₂O₃ inclusions.Because of the influence of slag-metal reaction and calcium treatment,the evolution of inclusion could be roughly described as follows:Al₂O₃→MgO-Al₂O₃ system inclusions→CaO-Al₂O₃-MgO or CaO-Al₂O₃ system liquid complex inclusions.
- oil casing steel /
- spinel /
- inclusion /
- thermodynamic calculation /
- evolution mechanisms