·92· 北京科技大学学报 2007年增刊1 珠钢，2006,27361 油套管钢的纯净度分析.特殊铜，2006,27(5)：61 [4)孙开明，张露.150t电炉连铸流程技术改造及创新实践/中国金 [6]唐海燕，李京社，杨树峰，等.EAF-LF/VD-CC工艺生产压力 属学2005中国钢铁年会论文集.北京：治金工业出版社，2005： 容器钢的洁净度研究.钢铁，待发表 146 [7)]吕同军，倪友来，张雪松，等.50t钢包炉LF)用精炼渣的研制. [5]唐海燕，李京社，王剑斌，等.EAF-LF(VDCC工艺生产石 特殊钢，2002,23(5)：41 Process of high-pressure boiler steel produced by EAF-LF/VD-CC TANG Haiyan),LI Jingshe FU Jianxun)HAN Limin),SUN Kaiming2)WEN Desong2) 1)Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing 100083,China 2)Tianjin Pipe Company Ltd.,Tianjin 300301,China ABSTRACT The high-pressure boiler steel 12CrIMoVG was produced in steelmaking plant,TPCO,by using foaming slag submerged arc operation in the whole period of EAF steelmaking,EBT tapping alloying,LF compound refining slag,Ca-Si wire feeding after VD treatment and casting with shielding practice.The quantity and changes of total oxygen,microinclusions and macroinclusions in the liquid steel in different steps were stud- ied by the way of sampling systematically,tracers and comprehensive analyses.The results show that the T[O]is 15x106 after LF/VD refining and 17x10-6 in tundish,and the T[O]of cast billets was 18x10-5~24x10-.The number of microinclusions was 3.53 mm2 with sizes less than 10 um,which were mainly spherical calcium alu- minate,aluminosilicate and compound inclusions of aluminate and sulphide.The macroinclusions were mainly ferrum-aluminum silicate,magnesium-calcium silicate,etc.The macrostructure is uniform and the surface quality is good.Each technical index meets the requirement of GB5310 standard. KEY WORDS high-pressure boiler steel;EAF-LF/VD-CC;process practice• 92 • 北 京 科 技 大 学 学 报 2007 年 增刊 1 殊钢，2006，27(3): 61 [4] 孙开明，张露. 150t 电炉连铸流程技术改造及创新实践//中国金 属学 2005 中国钢铁年会论文集. 北京：冶金工业出版社, 2005: 146 [5] 唐海燕，李京社，王剑斌，等. EAF−LF(VD)−CC 工艺生产石 油套管钢的纯净度分析. 特殊钢，2006, 27(5)：61 [6] 唐海燕，李京社，杨树峰，等. EAF−LF/VD−CC 工艺生产压力 容器钢的洁净度研究. 钢铁, 待发表 [7] 吕同军, 倪友来, 张雪松, 等. 50t 钢包炉(LF)用精炼渣的研制. 特殊钢，2002，23(5)：41 Process of high-pressure boiler steel produced by EAF−LF/VD−CC TANG Haiyan1), LI Jingshe1), FU Jianxun1), HAN Limin1), SUN Kaiming1,2), WEN Desong1,2) 1) Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2) Tianjin Pipe Company Ltd.，Tianjin 300301, China ABSTRACT The high-pressure boiler steel 12Cr1MoVG was produced in steelmaking plant，TPCO, by using foaming slag submerged arc operation in the whole period of EAF steelmaking，EBT tapping alloying，LF compound refining slag, Ca-Si wire feeding after VD treatment and casting with shielding practice. The quantity and changes of total oxygen, microinclusions and macroinclusions in the liquid steel in different steps were stud￾ied by the way of sampling systematically, tracers and comprehensive analyses. The results show that the T[O] is 15×10−6 after LF/VD refining and 17×10−6 in tundish, and the T[O] of cast billets was 18×10−6 ~24×10−6 . The number of microinclusions was 3.53 mm−2 with sizes less than 10 µm, which were mainly spherical calcium alu￾minate, aluminosilicate and compound inclusions of aluminate and sulphide. The macroinclusions were mainly ferrum-aluminum silicate, magnesium-calcium silicate, etc. The macrostructure is uniform and the surface quality is good. Each technical index meets the requirement of GB5310 standard. KEY WORDS high-pressure boiler steel; EAF−LF/VD−CC; process practice