工程科学学报，第38卷，增刊1：206-212,2016年6月 Chinese Journal of Engineering,Vol.38,Suppl.1:206-212,June 2016 DOI:10.13374/j.issn2095-9389.2016.s1.034:http://journals.ustb.edu.cn 高品质轴承钢LF-VD过程非金属夹杂物演变规律 吴华杰四，郭浩2》，魏崇一2)，岳峰) 1)北京科技大学钢铁共性技术协同创新中心，北京100083 2)北京科技大学治金工程研究院，北京100083 ☒通信作者，E-mail:whjyeah@163.com 摘要对国内一钢厂EAFLF→VDCC工艺生产的高品质GC15轴承钢进行系统取样，针对DS类非金属夹杂物随机性 强的特点，利用能够进行大面积试样检测的ASPEX自动扫描电镜分析统计钢中非金属夹杂物的成分、尺寸、数量等信息.研 究发现：GCrl5轴承钢治炼过程中非金属夹杂物主要为MgO一Al2O,-Ca0复合夹杂物和MnS,同时有少量的SiO2一Al2O3和 Mg0一Al2O,复合夹杂物：夹杂物尺寸主要集中在3~8m,并有少量DS类夹杂物出现且尺寸范围波动很大，最大可以达 70μm以上，形貌为圆形或近似圆形：VD有较强的去除夹杂物功能，经过VD真空精炼，夹杂物中C0含量有增加趋势：吊包 至铸坯过程，夹杂物成分向A山，03含量增多的区域移动，最终轴承钢铸坯中夹杂物成分位于高A山03含量（≥80%），少量Mg0 (<20%)和低C0(<5%)的区域：DS夹杂物的生成和去除具有较强的随机性， 关键词轴承钢：夹杂物：尺寸：形貌 分类号TF762.4 Evolution rules of inclusions in high quality bearing steel produced by LF-VD process WU Hua-jie,GUO Hao?,WEI Chong-yi,YUE Feng 1)Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China 2)Institute of Metallurgical Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:whjyeah@163.com ABSTRACT High quality GCr15 steel produced by EAF-LF-VD-CC process was systematically studied by sampling in various sta- ges for a domestic factory.For the random characteristics of DS inclusions,the evolution rules of inclusions in bearing steel smelting process were investigated by ASPEX inclusion quick analysis equipment,which can scan the specimen surface in large enough area. The results indicate that the main inclusions are MgO-Al,O,CaO and MnS,and there are also a small quantity of SiO,-Al,O:and Mgo-AlO3.The size of the majority of inclusions is 3-8um,few DS inclusions have a large size range,the biggest one can be more than 70um,and the morphologies of the inclusions are round or nearly circular.Inclusions will be significantly removed by VD process and the content of Cao in inclusions increases after VD process.The content of AlO in inclusions increases during the tundish to continuous casting process.Finally,the content of Al2O in inclusions is more than 80%,the content of Mgo is less than 20%,and the content of Cao is less than 5%in the ternary system of MgO-Al,O,-CaO.The formation and removal behaviors of DS inclusions in bearing steel are of higher degree randomness. KEY WORDS bearing steel:inclusions;size;morphology 随着治炼工艺的优化，GC15轴承钢的治金质量 遍在10×106，有的企业能够达到6×106以下.在 有了显著提高.在现代治炼工艺下，轴承钢T[0]普 极低的T[0]下，即使氧含量相同轴承钢寿命也有很 收稿日期：201603-22 基金项目：中央高校基本科研业务费资助项目(FRF-P-15O62A3)工程科学学报，第 38 卷，增刊 1: 206--212，2016 年 6 月 Chinese Journal of Engineering，Vol． 38，Suppl． 1: 206--212，June 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． s1． 034; http: / /journals． ustb． edu． cn 高品质轴承钢 LF--VD 过程非金属夹杂物演变规律 吴华杰1) ，郭 浩2) ，魏崇一2) ，岳 峰1) 1) 北京科技大学钢铁共性技术协同创新中心，北京 100083 2) 北京科技大学冶金工程研究院，北京 100083  通信作者，E-mail: whjyeah@ 163． com 摘 要 对国内一钢厂 EAF→LF→VD→CC 工艺生产的高品质 GCr15 轴承钢进行系统取样，针对 DS 类非金属夹杂物随机性 强的特点，利用能够进行大面积试样检测的 ASPEX 自动扫描电镜分析统计钢中非金属夹杂物的成分、尺寸、数量等信息． 研 究发现: GCr15 轴承钢冶炼过程中非金属夹杂物主要为 MgO--Al2 O3 --CaO 复合夹杂物和 MnS，同时有少量的 SiO2 --Al2 O3 和 MgO--Al2O3复合夹杂物; 夹杂物尺寸主要集中在 3 ～ 8 μm，并有少量 DS 类夹杂物出现且尺寸范围波动很大，最大可以达 70 μm以上，形貌为圆形或近似圆形; VD 有较强的去除夹杂物功能，经过 VD 真空精炼，夹杂物中 CaO 含量有增加趋势; 吊包 至铸坯过程，夹杂物成分向 Al2O3含量增多的区域移动，最终轴承钢铸坯中夹杂物成分位于高 Al2O3含量( ≥80% ) ，少量 MgO ( ＜ 20% ) 和低 CaO( ＜ 5% ) 的区域; DS 夹杂物的生成和去除具有较强的随机性． 关键词 轴承钢; 夹杂物; 尺寸; 形貌 分类号 TF762 + . 4 Evolution rules of inclusions in high quality bearing steel produced by LF--VD process WU Hua-jie1)  ，GUO Hao2) ，WEI Chong-yi2) ，YUE Feng1) 1) Collaborative Innovation Center of Steel Technology，University of Science and Technology Beijing，Beijing 100083，China 2) Institute of Metallurgical Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: whjyeah@ 163． com ABSTＲACT High quality GCr15 steel produced by EAF--LF--VD--CC process was systematically studied by sampling in various sta￾ges for a domestic factory． For the random characteristics of DS inclusions，the evolution rules of inclusions in bearing steel smelting process were investigated by ASPEX inclusion quick analysis equipment，which can scan the specimen surface in large enough area． The results indicate that the main inclusions are MgO--Al2O3 --CaO and MnS，and there are also a small quantity of SiO2 --Al2O3 and MgO--Al2O3 ． The size of the majority of inclusions is 3 － 8μm，few DS inclusions have a large size range，the biggest one can be more than 70μm，and the morphologies of the inclusions are round or nearly circular． Inclusions will be significantly removed by VD process and the content of CaO in inclusions increases after VD process． The content of Al2 O3 in inclusions increases during the tundish to continuous casting process． Finally，the content of Al2O3 in inclusions is more than 80% ，the content of MgO is less than 20% ，and the content of CaO is less than 5% in the ternary system of MgO--Al2O3 --CaO． The formation and removal behaviors of DS inclusions in bearing steel are of higher degree randomness． KEY WOＲDS bearing steel; inclusions; size; morphology 收稿日期: 2016--03--22 基金项目: 中央高校基本科研业务费资助项目( FＲF--TP--15--062A3) 随着冶炼工艺的优化，GCr15 轴承钢的冶金质量 有了显著提高． 在现代冶炼工艺下，轴承钢 T［O］普 遍在 10 × 10 － 6，有的企业能够达到 6 × 10 － 6以下． 在 极低的 T［O］下，即使氧含量相同轴承钢寿命也有很