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High-Al2O3 content high-aluminum steel continuous casting slag powder

A technology for continuous casting mold powder and high-alumina steel, which is applied in the field of mold mold powder for continuous casting of high-alumina steel and mold powder for continuous casting of high-alumina steel slabs, and can solve the problems of unfavorable mold flux melting, casting slab lubrication, and mold flux melting temperature. The problems such as rise and deterioration of glass morphology can achieve the effects of stable composition and performance of mold slag, reducing reaction and inhibiting content.

Active Publication Date: 2014-01-29
ZHONG NAT ENG & RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition design can avoid the large change of composition and performance deterioration caused by steel slag reaction; but the SiO in slag 2 The content is very low and Al 2 o 3 If the content is high, the melting temperature of the mold slag will increase and the glass shape will deteriorate, which is not conducive to the melting of the mold slag and the lubrication of the mold slab to the billet

Method used

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  • High-Al2O3 content high-aluminum steel continuous casting slag powder
  • High-Al2O3 content high-aluminum steel continuous casting slag powder
  • High-Al2O3 content high-aluminum steel continuous casting slag powder

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Effect test

Embodiment 1

[0030] a high Al 2 o 3 The content of high-alumina steel continuous casting mold flux, its composition mass percentage is: CaO: 7%, BaO: 14.5%, Al 2 o 3 : 31%, B 2 o 3 : 8%, SiO 2 : 5%, flux: CaF 2 : 11.3%, Na 2 O: 12.8%, Li 2 O: 1.5%, MnO: 2.5%, C: 5%, and the rest are unavoidable impurities. The melting temperature of the mold flux is 988°C, the viscosity at 1300°C is 0.24 Pa.s, and the vitrification rate is 95%.

[0031] in, figure 1 High Al for this example 2 o 3 Scanning electron microscopy (SEM) of mold flux for continuous casting of high-alumina steel, figure 2 High Al for this example 2 o 3 X-ray diffraction pattern (XRD) of mold flux for continuous casting of high aluminum content steel. Depend on figure 1 It can be seen that the mold flux is mainly a single homogeneous phase; figure 2 It can be seen from the XRD analysis that the mold flux is mainly glassy and contains a small amount of LiF crystal phase.

Embodiment 2

[0033] a high Al 2 o 3 The content of high-alumina steel continuous casting mold flux, its composition mass percentage is: CaO: 8.5%, BaO: 18%, Al 2 o 3 : 25.5%, B 2 o 3 : 7.3%, SiO 2 : 4.8%, Flux: CaF 2 : 9%, Na 2 O: 12.7%, Li 2 O: 1.5%, MnO: 2%, C: 8.4%, and the rest are unavoidable impurities. The melting temperature of the mold flux is 1020°C, the viscosity at 1300°C is 0.20 Pa.s, and the vitrification rate is 90%.

Embodiment 3

[0035] a high Al 2 o 3 The content of high-alumina steel continuous casting mold flux, its composition mass percentage is: CaO: 9%, BaO: 13.5%, Al 2 o 3 : 33%, B 2 o 3 : 10%, SiO 2 : 4.2%, Flux: CaF 2 : 8.5%, Na 2 O: 9.3%, Li 2 O: 2.5%, MnO: 3.4%, C: 6%, and the rest are unavoidable impurities. The melting temperature of the mold flux is 1070°C, the viscosity at 1300°C is 0.30 Pa.s, and the vitrification rate is 80%.

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Abstract

The invention belongs to the technical field of treating molten metal by using protection powder, and relates to high-Al2O3 content high-aluminum steel continuous casting slag powder, in particular to high-aluminum steel slab continuous casting slag powder of which Al content in steel is more than 1.5 percent. The slag powder comprises the following chemical components in percentage by mass: 5 to 20 percent of CaO, 5 to 20 percent of BaO, 20 to 50 percent of Al2O3, 2 to 15 percent of B2O3, less than or equal to 7 percent of SiO2, and 6 to 13 percent of CaF2, 6 to 13 percent of Na2O, 1 to 4 percent of LiO2, 2 to 6 percent of MnO, and 3 to 10 percent of C which are used as fluxing agents. The slag powder is good in glassy form, reaction between aluminum in steel and SiO2 in slag can be greatly reduced, and the substantial increasing of the Al2O3 content in slag can be inhibited, so the stability of the components and the performance of the slag powder in the casting process can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of molten metal treatment using protective powder, and relates to a mold flux for high-alumina steel continuous casting, in particular to a high-aluminum steel slab continuous casting flux with [Al]>1.5% in steel. Background technique [0002] Continuous casting mold slag is a functional consumable material that directly affects the stable production of continuous casting and improves the quality of casting slab. plays a vital role in the process. Usually, continuous casting mold flux is composed of CaO and SiO 2 Mainly binary system, plus CaF 2 、Na 2 O. Li 2 Fluxes such as O and MnO are used to adjust the melting temperature and viscosity of the mold flux, and a certain amount of carbon is added to control the melting speed of the mold flux. [0003] During the casting process of high aluminum steel, due to the high aluminum content in molten steel, the aluminum in the steel is easily mixed with som...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 仇圣桃王强朱果灵刘志宏胡坤太张兴中赵沛
Owner ZHONG NAT ENG & RES CENT
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