典型含钛超纯铁素体不锈钢冶炼-连铸过程夹杂物衍变研究  

Study on Inclusion Evolution of Typical Titanium-Containing Ultra-Pure Ferritic Stainless Steel in Steelmaking-Casting Process

作　　者：郎炜昀 翟俊[1,2] 赵鑫淼[2] 常国栋[2] Lang Weiyun;Zhai Jun;Zhao Xinmiao;Chang Guodong(State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron and Steel(Group)Co Ltd,Taiyuan 030003;Shanxi Taigang Stainless Steel Co Ltd,Taiyuan 030003)

机构地区：[1]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,太原030003 [2]山西太钢不锈钢股份有限公司,太原030003

出　　处：《特殊钢》2021年第1期16-19,共4页Special Steel

摘　　要：通过热力学分析、扫描电镜和EDS能谱分析等方法,系统研究了一种典型含钛超纯铁素体不锈钢(/%:≤0.01C,17.5~18.5Cr,0.40~0.55Nb,0.10~0.25Ti)80 t K-OBM-S-VOD-LF-200 mm×1 240 mm CCM过程夹杂物的衍变。结果表明,VOD还原期采用Si-Al复合脱氧,夹杂物类型以Al2O3-CaO-SiO2-MgO和Al2O3-CaO-MgO为主,钛合金化后夹杂物转变为Al2O3-CaO-TiOx-MgO,由于此类夹杂物熔点高、尺寸大,且很难通过钙处理变性,容易聚集造成水口堵塞。通过提高铝钛比至0.11以上,降低钛合金化前钢中全氧含量至25×10-6以下,使用纯净的钛铁合金可以避免形成大尺寸的含TiOx夹杂物。The evolution of inclusions in a typical titanium-containing ultra-pure ferritic stainless steel(/%:≤0.01 C,17.5~18.5 Cr,0.40 ~0.55 Nb,0.10 ~0.25 Ti) during 80 t K-OBM-S-VOD-LF-200 mm × 1 240 mm CCM process is systematically studied by means of thermodynamic analysis,scanning electron microscopy analysis and EDS(Energy Dispersive Spectum) analysis.The results show that while Si-Al composite deoxidization is used in VOD reduction period,the main types of inclusions are Al2 O3-CaO-SiO2-MgO and Al2 O3-CaO-MgO;after titanium alloying,the inclusions are transformed into Al2 O3-CaO-TiOx-MgO.Because of the high melting point and large size of such inclusions, it is difficult to be modified by calcium treatment,and easy to cause nozzle clogging.By increasing Al/Ti ratio more than 0.11,reducing T[O] in steel to below 25 × 10-6 before titanium alloying and using pure ferrotitanium alloy,the large-size inclusions containing titanium can be avoided.

关 键 词：超纯铁素体不锈钢 夹杂物 钛合金化 铝钛比 T[O] 纯净度 

分 类 号：TF777[冶金工程—钢铁冶金]