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Continuous casting covering slag for high-titanium steel and preparation method of continuous casting covering slag

A continuous casting mold flux and high-titanium technology, applied in the metallurgical field, can solve the problems of thickening of the sintered layer, restricting the application field of high-titanium steel, performance deterioration, etc., and achieve the effect of reducing CaO content, good internal quality, and ensuring stability.

Active Publication Date: 2022-01-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These high-melting titanium oxides enter into the mold flux, resulting in increased melting point, viscosity and performance deterioration of the mold flux
TiO2 will also combine with CaO in mold flux to precipitate perovskite with high melting point, which will affect the lubrication and heat transfer between the slab and the mold, and eventually cause slag inclusions, cracks and depressions under the slab skin and other defects
Mold flux for traditional titanium-containing steel is added by adding a large amount of Na2O, B2O3, K2 Fluxes such as O are used to lower the melting point of mold slag, but when the content of these low-melting point phases is too high, the mold slag melts too quickly, but the liquid slag does not have time to pass through the slag layer, resulting in thickening of the sintered layer, so this method cannot be realized. Continuous casting of high titanium steel
Therefore, the current production of high-titanium steel generally adopts the form of injection molding, which limits the application field of high-titanium steel and makes it difficult to achieve large-scale and low-cost production

Method used

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  • Continuous casting covering slag for high-titanium steel and preparation method of continuous casting covering slag

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preparation example Construction

[0038] The present invention provides a method for preparing the continuous casting slag for high-titanium steel described in the above technical solution, comprising:

[0039] Bauxite, alumina, barium carbonate, barium fluoride, fluorite, quartz sand, lithium carbonate and carbonaceous materials are prepared to obtain continuous casting mold flux for high titanium steel.

[0040] In the present invention, Al in the bauxite 2 o 3 The mass content of preferably>77%.

[0041] In the present invention, the alumina is preferably alumina for electrolytic aluminum; Al in the alumina 2 o 3 The mass content of preferably>77%.

[0042] In the present invention, the BaCO in the barium carbonate 3 The mass content of preferably >96%, the BaF in the barium fluoride 2 The mass content of preferably>96%, the CaF in the fluorite 2 The mass content of preferably>86%, SiO in the quartz sand 2 The mass content of preferably>92%, Li in the lithium carbonate 2 CO 3 The mass content of C...

Embodiment 1～4

[0070] Mix bauxite and electrolytic aluminum with alumina, barium carbonate, barium fluoride, fluorite, quartz sand, lithium carbonate and carbonaceous materials and then grind them to obtain powders with a particle size of 1 mm to 5 mm; after stirring and mixing , then add 10-20% of water, then stir until uniform, then pelletize and dry, put the dried ball into an induction furnace to smelt until the ball is completely melted into a liquid state, then cool, dry, and crush (after crushing Particle size is less than 5mm) to obtain mold slag premelt, and then prepared according to the conventional process of mold slag, crush the premelt to less than 200 mesh, add carbonaceous materials and put them into the fine mill together, and mix with 1 times Water (the quality of water is 1 times of the quality of premelt material), 1.6% cellulose binder (the quality of cellulose binder is 1.6% of the quality of premelt material), and the slurry obtained after fine grinding for 50 minutes ...

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Abstract

The invention provides continuous casting covering slag for high-titanium steel. The continuous casting covering slag comprises the following components: 0-6 wt% of CaO; 20-30 wt% of SiO2; 0-10 wt% of Fe2O3; 5-14 wt% of F; 3-10 wt% of LiO2; 35-50 wt% of BaO; 3-15 wt% of C; and the balance of impurities. Aiming at the high-titanium steel, the crystallizer covering slag suitable for continuous casting pouring is designed and developed; according to the covering slag, the reactivity of substances such as Fe2O3, Al2O3, Na2O and B2O3 with titanium in the steel is effectively reduced, so that the performance of the covering slag is stabilized; and in addition, the content of CaO in the covering slag is greatly reduced, the production of high-melting-point perovskite is effectively prevented, and the performance stability of the high-titanium steel in the pouring process is ensured. The invention further provides a preparation method of the continuous casting covering slag for the high-titanium steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a continuous casting mold flux for high titanium steel and a preparation method thereof. Background technique [0002] In the casting process of high-titanium steel, due to the high content of titanium in the molten steel, the titanium in the steel will not only react with oxygen in the steel and in the air to form titanium oxide during the casting process, but also react with SiO in the mold slag. 2 , Fe 2 o 3 、Al 2 o 3 、Na 2 O.B 2 o 3 Such oxides undergo a series of complex chemical reactions to produce titanium oxide. The titanium oxide with high melting point enters the mold flux, which leads to the increase of the melting point and viscosity of the mold flux and the deterioration of its performance. TiO 2 It will also combine with CaO in the mold flux to precipitate perovskite with high melting point, which will affect the lubrication and heat transfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111B22D11/001Y02P10/20C21C7/076
Inventor 张敏曾建华王谦吴国荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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