含钛型连铸保护渣性能及应用研究进展

doi:10.13228/j.boyuan.issn0449-749x.20220234

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Abstract With the advancement of iron and steel technology and the needs of social development,iron and steel enterprises are developing and producing various types of high-quality special steel grades with high strength,good toughness and strong corrosion resistance. How to effectively control the stability of the continuous casting production process for special steel grades is a common problem faced by the current mold flux development. Designing and developing reasonable chemical composition of mold slag,stabilizing its physical and chemical properties,and ensuring good slab quality of special steel grades are hot issues concerned by researchers in the field of iron and steel metallurgy. To this end,relevant researchers have carried out a large number of basic theoretical and applied researches on mold slag,and achieved certain results. Most scholars believe that adding a certain amount of TiO₂ to the traditional mold slag can improve the physical and chemical properties of the mold slag,improve the ability to adsorb inclusions, prevent the steel-slag interface reaction,and reduce the occurrence of slab quality problems. When the TiO₂ content in the mold slag is in the range of 4% to 8%,the alkalinity is controlled between 1.1 and 1.3,which can effectively improve the physical and chemical properties of the mold slag such as melting temperature,viscosity and heat flux density,and can also promote the crystallization of the slag film. It can basically meet the requirements of special steel grades such as high-titanium steel and high-alumina steel;the perovskite in the titanium-containing mold slag film can replace the gun spar in the traditional mold slag film,which has a great effect on the heat transfer of the mold slag. It plays a decisive role;after the titanium-containing mold slag absorbs the inclusions in the molten steel,the physical properties of the mold slag remain stable,and can prevent the "fishing" on the surface of the slab caused by the interface reaction between the titanium in the special molten steel and the mold slag. The occurrence of titanium-containing mold slag has been initially explored and applied in some special steel grades and staged results have been achieved. About the influence mechanism of perovskite and other minerals in the slag film on the heat transfer of titanium-containing mold powder,how to better coordinate the contradiction between the basic performance of mold powder and the lubricating heat transfer mechanism,and realize the continuous connection of titanium-containing mold powder. The wide application in the casting process to meet the high-quality,high-efficiency and stable production needs of the continuous casting process is still the main subject of further research by metallurgical workers.

Key words： titanium-containing continuous casting mold flux TiO₂ melting performance crystallization property heat transfer mechanism continuous casting

Received: 07 April 2022

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	HAN Xiu-li
	LIU Ying-ying
	LIU Lei
	YAN Xiao-peng
	LIU Zi-yao

Cite this article:

HAN Xiu-li,LIU Ying-ying,LIU Lei等. Review on research progress of properties and application of titanium-containing continuous casting mold flux[J]. Iron and Steel, 2022, 57(10): 10-18.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220234 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I10/10

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