Effect of steel-slag reaction on physicochemical properties of mold fluxes of high-Titanium steel
JIN He-bin1, JI Jun-de1, WANG Shi-song2, ZHANG Xu-bin1, WANG Qiang-qiang1, HE Sheng-ping1
1. College of Materials Science and Engineering, Chongqing School University, Chongqing 400044, China; 2. Steelmaking Plant, Qingdao Special Steel Co., Ltd., Qingdao 266400, Shandong, China
Abstract:Aiming at the problem of steel-slag reaction in the continuous casting of high-Titanium steel and the variation of slag properties before and after reaction, in the current study the mold slag for casting high-Titanium steel was focused on. The reactivity of the high-titanium steel and mold slags was studied through experiments, and the changes of composition and properties of two continuous casting slags with different TiO2 contents before and after reaction were compared. Experimental results show that, with the Titanium content in steel of 0.68% and the increase of the TiO2 content in slag from 10% to 15%, the steel-slag reaction occurred between Titanium in steel and oxide components in slag, but the reaction was obviously inhibited. After the steel-slag reaction, the melting point, viscosity and breaking temperature of mold slags increased slightly. Crystalline phases of these slags were mainly LiTiO2 and BaTiO3, and changed less before and after the steel-slag reaction.
靳贺斌, 吉俊德, 王时松, 张旭彬, 王强强, 何生平. 钢渣反应对高钛钢保护渣物化特性的影响[J]. 连铸, 2021, 40(6): 59-64.
JIN He-bin, JI Jun-de, WANG Shi-song, ZHANG Xu-bin, WANG Qiang-qiang, HE Sheng-ping. Effect of steel-slag reaction on physicochemical properties of mold fluxes of high-Titanium steel. CONTINUOUS CASTING, 2021, 40(6): 59-64.
HE S, LI Z, CHEN Z, et al. Review of mold fluxes for continuous casting of high-alloy (Al, Mn, Ti) steels[J]. Steel Research International, 2019, 90, 1800424.
Bolokang A, Motaung D, Arendse C, et al. Morphology and structural development of reduced anatase-TiO2 by pure Ti powder upon annealing and nitridation: Synthesis of TiOx and TiOxNy powders[J]. Materials Characterization, 2015, 100: 41.
[17]
CHEN Z, LI M, WANG X, et al. Mechanism of floater formation in the mold during continuous casting of Ti-stabilized austenitic stainless steels[J]. Metals, 2019, 9(6): 635.
[18]
Todoroki H, Ishii T, Mizuno K,et al. Effect of crystallization behavior of mold flux on slab surface quality of a Ti-bearing Fe-Cr-Ni super alloy cast by means of continuous casting process[J]. Materials Science and Engineering: A, 2005, 413/414: 121.
[19]
ZHU L, WANG Q, WANG Q,et al. The relationship between crystallization and break temperature of mould flux[J]. Ironmaking and Steelmaking, 2018, 46: 1.