Crystallizer casting powder for continuous casting of titanium-containing steel

Abstract

The invention provides crystallizer casting powder for continuous casting of titanium-containing steel. The casting powder comprises, by weight, 5-35% of CaO1, 7-15% of SiO2, 10-30% of Al2O3, 3-15% of F-, 3-10% of Li2O, 5-20% of BaO5, 5-20% of Mn2O3, 2-12% of C, MgO with the amount smaller than or equal to 1.5% and Fe2O3 with the amount smaller than or equal to 2%. The melting point of the casting powder for continuous casting ranges from 960 DEG C to 1200 DEG C and 1300 DEG C, and viscosity ranges from 0.08 Pa.s to 0.18 Pa.s. Compared with a traditional slag system, the content of SiO2 is lower, and the content of Al2O3 is higher. Meanwhile, a certain amount of Mn2O3 is matched to serve as a strong oxidant, harm of interface solid coagulation of steel slag in a crystallizer in the continuous casting process of the titanium-containing steel is effectively eliminated or relieved, relative stability of performance of the casting powder is maintained, the number of continuous casting is increased, surface quality of casting blanks is improved, and the surface coping amount of the casting blanks is reduced.

Description

technical field [0001] The invention belongs to the technical field of mold powder for continuous casting, and in particular relates to mold powder for continuous casting of titanium-containing steel. Background technique [0002] During the titanium-containing casting process, due to the high content of aluminum, titanium, and nitrogen in molten steel, a large amount of TiN can be precipitated at the casting temperature and float to the steel slag interface, and SiO 2 At the same time, the components in the slag react with [Al] and [Ti] in the molten steel to increase the basicity of the slag system, and produce perovskite and other high melting point substances that are mixed with the steel slag and form at the steel slag interface in the crystallizer. Solid condensation leads to changes in the composition and performance of mold slag, and also hinders the normal supply of mold slag liquid slag. These factors are likely to cause problems such as breakouts, slag inclusions,...

AI Technical Summary

Problems solved by technology

Chinese patent 200710193114.2 discloses "Continuous Casting Mold Flux and Its Production Process for Titanium Slab Stainless Steel". In the invention, Fe 2 o 3 The content is ≤3%, by adding a certain amount of Fe 2 o 3 Can effectively weaken SiO 2 Reactive with Al and Ti in the steel, it can effectively reduce the surface defects of the slab, and the production rate is high, but the oxidant Fe is added 2 o 3 Reaction with TiN floating to the interface of steel slag: (Fe 2 o 3 )+[TiN]=[Fe]+(TiO 2 ), the generated iron element is mixed in the slag to provide favorable conditions for the formation of "congealed fish" (that is, the solid condensate at the steel slag interface in the crystallizer). Not conducive to the separation of slag and steel

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