X70管线钢RH真空脱气过程夹杂物的去除行为  

Removal Behavior of Inclusion During RH Vacuum Treatment of X70 Pipeline Steel

作　　者：杨光维[1] 初仁生[1] 王新华[1] 黄福祥[1] 王万军[1] 尹雨群 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]南京钢铁联合有限公司,江苏南京210035

出　　处：《钢铁》2014年第1期34-38,共5页Iron and Steel

基　　金：国家自然科学基金资助项目(51204014)

摘　　要：利用ASPEX全自动扫描电镜对X70管线钢RH真空处理过程的夹杂物形貌、成分、数量和尺寸进行了系统研究。结果表明，RH过程中夹杂物主要为液态球状含少量MgO的CaO-Al2O3系夹杂物。夹杂物随RH真空处理时间的增加而减少，RH处理28min后，钢液中夹杂物去除率达70%。除延长RH真空处理时间外，减少RH进站夹杂物可大幅降低RH终点夹杂物数量。总体夹杂物和1-5μm夹杂物数量随RH真空处理时间单调递减；对于大于5μm的夹杂物，其数量先增大后减少，而且随着夹杂物尺寸的增加，数量达到最大值所需真空处理时间增加。RH真空处理后，夹杂物平均尺寸有所增加，由2.2-2.5μm增加到3.0-3.9μm。Inclusion morphology, composition, number and size at various times of the RH vacuum treatment were investigated on X70 pipeline steel with ASPEX. Results suggest that： The inclusions are mainly liquid globular CaO-Al2O3 with a small amount of MgO throughout RH vacuum treatment. Inclusion number decreases with time and decreases by 70% after 28min RH vacuum treatment. Inclusion number after RH treatment can be dramatically reduced by reducing inclusions before RH treatment. The total inclusions and inclusions with size 1-5μm is monotonously decreased in number, while inclusions over 5μm firstly increase then decrease after reaching the maximum. It takes more time for bigger inclusions to reach the maximum. The average diameter of inclusions increases from 2.2-2.5μm before RH to 3.0-3.9μm after RH.

关 键 词：管线钢 RH真空处理 夹杂物 去除 液态 ASPEX 

分 类 号：TF769.4[冶金工程—钢铁冶金]