In continuous casting of peritectic steel grades sensitive to longitudinal cracking, the solidification properties of mold fluxes play an important role in keeping smooth running of continuous casting process and achieving high surface quality of casting strands. To reduce fluorine pollution in molten slag, types of CaO-SiO2-TiO2 （CTS） based mold fluxes were investigated. The solidification and crystallization properties, including viscosity η at 1 573 K, break temperature Tbr, crystallization ratio Rc and solidification mineragraphy were measured, which were compared with those of CaO-SiO2-CaF2 based mold fluxes. The experiments show that there are unstable viscosity-high tem- perature properties and high Tbr in part of CTS slag system, which are bad for lubrication between liquid flux film and strand. And when temperature is below Tbr, the viscosities change slowly during cooling in some part of this slag system, which imply that liquid mold fluxes solidify slowly and it is easy to cause surface longitudinal cracks on strand. Major mineragraphy of the CaO-SiO2-TiO2 based mold fluxes are CaO · TiO2 or CaO · TiO2 and CaO · SiO2 · TiO2. TiN and Ti（C,N） can be formed in mold fluxes bearing high TiO2 during the continuous casting.
参考文献
| [1] | Kenneth C. MILLS;Alistair B. FOX .The Role of Mould Fluxes in Continuous Casting―So Simple Yet So Complex[J].ISIJ International,2003(10):1479-1486. |
| [2] | A. Yamauchi;K. Sorimachi;I. Yamauchi .Effect of solidus temperature and Crystalline phase of mould flux on heat transfer in continuous Casting mould[J].Ironmaking & Steelmaking: Products and applications,2002(3):203-207. |
| [3] | WANG Qian;HE Sheng-ping;Mills K C .Research on Decrea- sing Fluorine Content From Continuous Casting Mould Fluxes[J].Journal of Iron and Steel Research International,2008,15(Suppl):715. |
| [4] | Zaitsev A I;Leites A V;Litvina A D et al.Investigation of the Mould Powder Volatiles During Continuous Casting[J].Steel Researeh International,1994,65(09):368. |
| [5] | 王谦,王平,何生平,解丹,Z.S.Li,K.C.Mills.保护渣对连铸二冷水中氟含量的影响[J].北京科技大学学报,2006(11):1019-1022. |
| [6] | 何生平,徐楚韶,王谦,迟景灏,李玉刚,邱贵宝.无氟连铸保护渣有关技术问题的探讨[J].钢铁研究学报,2007(07):1-3,8. |
| [7] | Hideko NAKADA;Kazuhiro NAGATA .Crystallization of CaO-SiO_2-TiO_2 Slag as a Candidate for Fluorine Free Mold Flux[J].ISIJ International,2006(3):441-449. |
| [8] | 韩文殿,仇圣桃,张兴中,干勇.结晶器无氟保护渣渣膜的传热性和矿物结构[J].钢铁研究学报,2007(03):14-16. |
| [9] | HE Shengping;WANG Qian;XIE Dan et al.Solidification and Crystallization Properties of CaO-SiOz-Naz O Based Mold Fluxes[J].International Journal of Minerals, Metallurgy and Materials,2009,16(03):261. |
| [10] | S.Sridhar;K.C.Mills .Break temperatures of mould fluxes and their relevance to continuous casting[J].Ironmaking & Steelmaking: Products and applications,2000(3):238-242. |
| [11] | 何生平,徐楚韶,王谦,解丹.CeO2对低氟连铸保护渣转折温度和结晶性能的影响[J].中国稀土学报,2007(03):377-380. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%