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A medium carbon steel fluorine-free mold flux

A mold slag and carbon steel technology, applied in the field of iron and steel smelting and continuous casting, can solve the problem of increasing the probability of viscous steel breakout, and achieve the effects of reducing viscosity, smooth and free movement, and control of heat transfer

Active Publication Date: 2019-09-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the addition of Ti is easy to form TiN at high temperature, and the probability of viscous breakout is greatly increased.

Method used

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  • A medium carbon steel fluorine-free mold flux
  • A medium carbon steel fluorine-free mold flux
  • A medium carbon steel fluorine-free mold flux

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Ingredients: binary alkalinity CaO / SiO 2 1.25, CaO 40%, SiO 2 32%, Al 2 o 3 5%, MgO 2%, Na 2 O8%, Li 2 O 1%, B 2 o 3 6%, BaO 6%.

[0050] 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 gaseous substances, and form complex mixtures between components. 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.

[0051] The main physical properties of mold flux are shown in Table 1.

Embodiment 2

[0053] Ingredients: binary alkalinity CaO / SiO 2 1.25, CaO 38.89%, SiO 2 31.11%, Al 2 o 3 5%, MgO2%, Na 2 O 8%, Li 2 O 1%, B 2 o 3 6%, BaO 8%.

[0054] Preparation process: with embodiment 1.

[0055] The main physical properties of mold flux are shown in Table 1.

Embodiment 3

[0057] Ingredients: binary alkalinity CaO / SiO 2 1.25, CaO 37.78%, SiO 2 30.22%, Al 2 o 3 5%, MgO2%, Na 2 O 8%, Li 2 O 1%, B 2 o 3 6%, BaO 10%.

[0058] Preparation process: with embodiment 1.

[0059] The main physical properties of mold flux are shown in Table 1.

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Abstract

The invention discloses medium-carbon steel fluoride-free casting powder. The casting powder is composed of the following oxide components of, by mass, 35-45% of CaO, 30-40% of SiO2, 6-12% of (Al2O3 + MgO), 8-15% of (Na2O + Li2O), greater than or equal to 6% and less than or equal to 15% of B2O3 and greater than or equal to 6% and less than or equal to 10% of BaO, wherein the ratio of the CaO to the BaO is greater than or equal to 4.5 and less than or equal to 6.8, in addition, the content of the Li2O is about 1%, the dual alkalinity is 1.25 preferably, wherein the dual alkalinity is equal to the ratio of the CaO to the SiO2. According to the medium-carbon steel fluoride-free casting powder, by adding a certain amount of BaO, original Si-O-Si bonds and B-O-B bonds are broken, formation of a granuliform calcium borosilicate (Ca11Si4B2O22) crystallized phase is promoted, meanwhile, the casting powder is kept at a relatively low viscosity, and the crystal phase of the casting powder is granuliform calcium borosilicate; the problem that the crystallization property and the lubricating property of casting powder worsen after defluorinating is conducted is solved, moreover the casting powder is totally free of fluoride, and the problems of corrosion to equipment and pollution to the environment caused by the fluoride in the continuous casting process are further solved.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to a medium-carbon steel fluorine-free protective slag with good crystallization performance and a new type of replacement lance spar crystal mineral phase-calcium borosilicate grain formation and control technology. Background technique [0002] Steel continuous casting technology has become one of the key technologies in the modern steel manufacturing industry. Continuous casting mold powder has many important functions in the continuous casting process, such as heat insulation, lubricating billet shell and controlling heat transfer. Among them, the functions of lubrication and heat transfer Most importantly, it plays an extremely important role in improving the surface quality of the slab and ensuring the smooth progress of the continuous casting process. For crack-sensitive steels such as medium carbon steel, due to the volume shrinkage caused by the γ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 王万林黄道远张磊周乐君朱晨阳李欢谢森林余杰
Owner CENT SOUTH UNIV
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