A New Type of High Aluminum Steel Mold Flux and Its Application

A technology of mold slag and high-alumina steel, which is applied in the field of iron and steel smelting and continuous casting, can solve the problems of low consumption of slag-forming circles, reaction of mold slag to steel, unfavorable heat transfer of mold slag, etc., to achieve good chemical composition stability, The effect of stable billet quality and stable physical and chemical properties

Active Publication Date: 2021-09-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mold slag steel that adopts this kind of scheme reacts severely, and [Al] in the steel will interact with SiO in the mold slag. 2 , go into the mold powder
[0005] The second is weak (non) reactive low silicon CaO-Al 2 o 3 Mold flux, for example, patent CN 102389955 A controls SiO in mold flux 2 content within 2%, and the patent CN 108213365 A is controlled (Na 2 O+K 2 O+SiO 2 )≤2%, which can effectively reduce the reaction of slag and steel, and inhibit the composition change and performance deterioration of the mold slag, but the mold slag has a high basicity and strong crystallinity, which is not conducive to the heat transfer of the mold slag, and there will be poor melting in the continuous casting process , easy slagging circle and low consumption

Method used

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  • A New Type of High Aluminum Steel Mold Flux and Its Application
  • A New Type of High Aluminum Steel Mold Flux and Its Application
  • A New Type of High Aluminum Steel Mold Flux and Its Application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Ingredients: Na 3 AlF 6 40.2%, Al 2 o 3 29.9%, CaO 10.2%, CaF 2 2.3%, MnO 5.1%, Fe 2 o 3 4.1%, C8.2%.

[0034] Preparation process: 1) Use cryolite, limestone, bauxite and other industrial raw materials to convert and weigh according to the content of the above-mentioned mold powder components; mix the weighed raw materials and perform mechanical stirring to make the ingredients evenly mixed; 2) mix the Pour the good sample into a graphite crucible and put it into an intermediate frequency induction furnace to heat and melt it, and keep it warm for a period of time to remove volatile matter and uniform slag components; 3) pour the molten slag into water and quench to obtain a glassy sample; 4) put After the glassy sample is broken, add the required amount of carbonaceous material and cellulose binder to make a slurry; 5) send the obtained slurry into a spray particle drying tower for drying and granulation, and the product requires a moisture content of less than ...

Embodiment 2～4

[0037] Ingredients: The components are as shown in Table 1.

[0038] Preparation process: with embodiment 1.

[0039] The main physical properties of mold flux are shown in Table 1.

[0040] Table 1 Chemical composition (wt%) and physical properties of mold fluxes in Examples 1-4 and Comparative Examples 1-2

[0041]

[0042] Table 2 The chemical composition (wt%) and physical properties of the mold flux of the examples and comparative examples 3-4

[0043]

[0044] It can be seen from Table 1 that the melting temperatures of Examples 1 to 4 are 1084°C, 1042°C, 1039°C, and 1027°C respectively, and the viscosities at 1300°C are 0.027Pa·s, 0.021Pa·s, 0.014Pa·s, 0.011Pa·s respectively s, the heat flux is 733KW·m -2 、728KW·m -2 、706KW·m -2 、713KW·m -2 .

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Abstract

The invention discloses a novel high-aluminum steel mold flux. It consists of the following components: Na 3 AlF 6 40%~65%, Al 2 o 3 10%~40%, CaO 6%~14%, CaF 2 1%~7%, Fe 2 o 3 1% to 7%, MnO 1% to 7%, C 3% to 15%, and the rest are unavoidable impurities. Mold flux of the present invention adopts Na 3 AlF 6 ‑Al 2 o 3 Slag system, compared with traditional high aluminum steel mold flux, basically does not contain SiO 2 、Na 2 O and other components that react with active elements such as [Al] in molten steel do not react with steel slag, and their composition and performance are stable. During continuous casting, they can absorb inclusions in steel without deterioration of mold slag performance, and can quickly Good lubrication of the billet and control of heat transfer ensure the smooth progress of the continuous casting process of high aluminum steel.

Description

technical field [0001] The invention relates to a novel high-aluminum steel mold slag and its application, belonging to the field of iron and steel smelting and continuous casting. Background technique [0002] Mold powder plays an important role in continuous casting production, such as absorbing inclusions, controlling heat flow, lubricating the initial solidification shell, preventing oxidation of molten steel, and reducing heat loss. Traditional mold fluxes can be divided into three types according to their components: silicon-aluminum-sodium, silicon-aluminum-fluorine and calcium-silicon-aluminum systems. 2 O, MgO, Li 2 O, CaF 2 , B 2 o 3 and manganese oxide and other compounds) and skeleton (carbon black, graphite, etc.). [0003] The content of aluminum in high-aluminum steel is generally greater than 0.5%. Due to the high content of Al in high-alumina steel, [Al] in the continuous casting process will interact with SiO in mold flux 2 Reduction substances such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111B22D11/108
CPCB22D11/108B22D11/111
Inventor 周乐君王万林颜雄吴厚发罗豪张磊
Owner CENT SOUTH UNIV
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