Abstract：In the continuous casting process of titanium containing steel, some TiO2 inclusions enter the mold flux, which leads to the deterioration of slag properties and affects the slab quality. The relationship between the dissolution rate of TiO2 in mold flux and the factors such as rotation speed, temperature and B2O3content was studied by rotation method. The results show that the dissolution rate of TiO2 in mold flux is directly proportional to the square root of the angular velocity of rod rotation. The dissolution rate of TiO2 in mold flux increased significantly with the increase of temperature. When w(B2O3) = 0-9%, with the increase of B2O3 content, the dissolution rate of TiO2 increases, and dissolution activation energy decreases from 162.99 to 123.95 J/mol, but the effect of B2O3 content on the dissolution rate is significantly less than that of temperature. The above research results better clarify the dissolution mechanism of TiO2 in mold flux, which can provide a certain reference for the continuous casting process of titanium containing steel.
周乐君, 杨洋, 王万林, 潘子航. 氧化硼对保护渣中TiO2溶解动力学的影响[J]. 连铸, 2021, 40(6): 54-58.
ZHOU Le-jun, YANG Yang, WANG Wan-lin, PAN Zi-hang. Effect of boron oxide on dissolution kinetics of TiO2 in mold flux. CONTINUOUS CASTING, 2021, 40(6): 54-58.
Nunnington R C, Sutcliffe N. The Steelmaking and casting of Ti stabilized stainless steels[C]//59th Electric Furnace Conference and 19th Process Technology Conference Proceeding. Phoenix, AZ: Iron and Steel Society AIME, 2001.
REN Z S, HU X J, HOU X M, et al. Dissolution and diffusion of TiO2 in the CaO-Al2O3-SiO2 slag[J]. International Journal of Minerals Metallurgy and Materials, 2014(21): 345.
[7]
Hao Z Q, Chen W Q, Lippold C, et al. A Study on kinetics of TiO2 inclusion absorbed by mold fluxes[J]. Special Steel, 2009, 30(5):13.
[8]
Wang Z J, Sohn I. Effect of substituting CaO with BaO on the viscosity and structure of CaO-BaO-SiO2-MgO-Al2O3 slags[J]. Journal of the American Ceramic Society, 2018(101): 4285.
[9]
Kim T S, Park J H. Viscosity-structure relationship of alkaline earth silicate melts containing manganese oxide and calcium fluoride[J]. Journal of the American Ceramic Society,2019(102): 4943.
YU X,WEN G H,TANG P, et al. Effect of B2O3 on the physico-chemical properties of mold slag used for high-Al steel[J]. Chongqing Daxue Xuebao/Journal of Chongqing University, 2011, 34(1):66.
[12]
Sharma M, Hanna A, Dabkowska H A, et al. Application of optical floating zone method to dissolution kinetics of inclusions in a steelmaking slag[J]. Steel Research International. 2019, 90(1): 6.
[13]
WANG Z, SHU Q F, CHOU K C. Viscosity of fluoride-free mold fluxes containing B2O3 and TiO2[J]. Steel Research International, 2013, 84(8): 766.
[14]
Park H, Park J Y, Kim G H. Effect of TiO2 on the viscosity and slag structure in blast furnace type slags[J]. Steel Research International, 2012, 83(2):150.
[15]
Brooks G, Johnston P W. Effect of Al2O3 and TiO2 additions of the lubrication characteristics of Mould fluxes[C]//Proceedings of the 5th International Conference on Molten slags, fluxes and salts, Sydney, Australia: ISS, 1997.
[16]
Kishi T, Takeuchi H, Yamimaya M. Mold powder technology for continuous casting of titanium-stabilized stainless steel[J]. Nippon Steel Technical Report, 1987, 34: 11.
[17]
LIU L, HU M L, BAI C G. Effect of cooling rate on the crystallization behavior of perovskite in high titanium-bearing blast furnace slag[J]. International Journal of Minerals Metallurgy and Materials, 2014, 21(11): 1052.
SUN L F, WANG H P, JIANG M F. Effects of TiO2 on the viscocity and solidification temperature of mold fluxes for the stainless steel[J]. Advanced Materials Research, 2011, 189(193): 107.
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