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Fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel

A technology for mold slag and carbon steel, applied in the field of iron and steel smelting and continuous casting, can solve the problems of weak control ability of mold slag heat transfer, increased probability of viscous breakout, long incubation time, etc., to solve the problem of fluorine pollution and reduce treatment costs. , the effect of excellent crystallization performance

Active Publication Date: 2015-05-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main problems faced in the non-fluoridation process of medium-carbon mold flux are: 1. How to ensure the stability of the viscosity-temperature characteristics under high temperature conditions after the mold flux is free of fluoride; 2. How to precipitate under the condition of fluorine-free Close crystals to ensure effective control of heat transfer during solidification
The results show that after adding titanium, the mold flux will precipitate CaOSiO 2 TiO 2 Mineral phase, the incubation time of this mineral phase is very long at high temperature, the crystallization ability is much lower than that of commercial fluorine-containing slag, and the ability of mold slag to control heat transfer is weak
At the same time, the addition of Ti is easy to form TiN and Ti(C,N) at high temperature, and the probability of viscous breakout is greatly increased

Method used

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  • Fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel
  • Fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel
  • Fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel

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Effect test

Embodiment 1

[0028] Ingredients: binary alkalinity CaO / SiO 2 1.18, CaO 40%, SiO 2 34%, Al 2 o 3 3%, MgO 2%, Na 2 O 9%, Li 2 O 3%, B 2 o 3 8%, ZrO 2 1%.

[0029] Preparation process: Weigh the above-mentioned mold slag raw materials according to the target components, and perform mechanical stirring to make the components evenly mixed, and then use an intermediate frequency induction furnace to heat and melt the mixed samples to remove volatiles and gas substances, and form complex Solid solution, the molten slag is poured into water and quenched to obtain a glassy mold slag block, and the mold slag block is mechanically crushed and ground to obtain the required mold slag powder.

[0030] For the main physical properties of mold flux, see Table 1 .

Embodiment 2

[0032] Ingredients: binary alkalinity CaO / SiO2 is 1.25, CaO 40%, SiO 2 32%, Al 2 o 3 5%, MgO 2%, Na 2 O 9%, Li 2 O 1%, B 2 o 3 9%, ZrO 2 2%.

[0033] Preparation process: with embodiment 1.

[0034] For the main physical properties of mold flux, see Table 1 .

Embodiment 3

[0036] Ingredients: binary alkalinity CaO / SiO2 is 1.27, CaO 42%, SiO 2 33%, Al 2 o 3 3%, MgO 2%, Na 2 O 10%, Li 2 O 1%, B 2 o 3 7%, ZrO 2 2%.

[0037] Preparation process: with embodiment 1.

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Abstract

The invention discloses a fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel. The mould flux is composed of, by mass, 35%-45% of CaO, 30%-35% of SiO2, 2%-5% of Al2O3, 1%-3% of MgO, 6%-10% of B2O3, 10%-15% of (Na2O+Li2O) and 1%-3% of ZrO2, wherein the ratio of (Na2O+Li2O+ZrO2) to B2O3 is greater than or equal to 1.3 and smaller than or equal to 2. The fluoride-free mould flux is excellent in crystallization property, the crystallized phase is calcium borate silicate, and meanwhile ZrO2 is added so as to facilitate precipitation of the calcium borate silicate, refine grains of the calcium borate silicate and enhance the stability of the calcium borate silicate. The mould flux contains no fluoride, solves the problem of fluorine pollution in the continuous casting process, and can greatly reduce treatment cost of continuous casting cooling water and the corrosion speed of a casting machine.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to the preparation and stabilization technology of fluorine-free protective slag for continuous casting of zirconium-containing medium carbon steel and a new type of lance spar crystal mineral phase replacement. Background technique [0002] Continuous casting technology is one of the key technologies to optimize the modern iron and steel industry. The continuous casting mold mold slag plays an important role in the continuous casting process, such as heat insulation, preventing secondary oxidation of molten steel, absorbing non-metallic inclusions, lubricating the billet shell, and controlling heat transfer. Among them, the lubrication and heat transfer functions are the most important, which play an extremely important role in improving the surface quality of the slab and ensuring the smooth progress of the continuous casting process. At present, the prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 王万林黄道远颜雄马范军
Owner CENT SOUTH UNIV
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