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BaO-containing high-aluminum TRIP steel casting powder and application thereof

A technology of mold slag and high-aluminum steel, which is applied in the field of iron and steel smelting and continuous casting, can solve the problem that liquid slag cannot flow smoothly into the slab and mold wall, the thickness of the slag layer of mold slag is thin, and the lubrication and transmission control cannot be well exerted. Heat and other problems, to achieve the effect of lowering the melting point and crystallization ability, improving stability, and ensuring lubrication

Active Publication Date: 2017-12-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing studies have found that Al 2 o 3 Can not completely replace SiO 2 , Chongqing University used SiO 2 The mass percentage is 6% and CaO / Al 2 o 3 The new mold slag of = 1 was tried in the continuous casting process of high aluminum steel, but it was found that the thickness of the slag layer of the mold slag on the molten steel surface was relatively thin, and the liquid slag could not smoothly flow into the gap between the billet and the mold wall. As a result, important functions such as lubrication and heat transfer control cannot be played well.

Method used

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  • BaO-containing high-aluminum TRIP steel casting powder and application thereof
  • BaO-containing high-aluminum TRIP steel casting powder and application thereof
  • BaO-containing high-aluminum TRIP steel casting powder and application thereof

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Experimental program
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Effect test

Embodiment 1

[0063] Ingredients: (CaO+BaO) / Al 2 o 3 1.51, (CaO+BaO) / SiO 2 3.02, CaO29.56%, Al 2 o 3 24.29%, SiO 2 12.19%, Na 2 O 7.89%, Li 2 O 1.97%, F - 9.11%, MnO 6.02%, TiO 2 1.98%, BaO 7.25%. In the mold flux, the crystallization rate of the feldspar crystal phase is 57%.

[0064] 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.

[0065] The main physical properties of mold flux are shown in Table 1.

[0066] The protection medium is used for continuous casting with an Al content of 1.5wt%, and the amount...

Embodiment 2

[0068] Ingredients: (CaO+BaO) / Al 2 o 3 1.38, (CaO+BaO) / SiO 2 2.68, CaO 26.18%, Al 2 o 3 25.42%, SiO 2 13.16%, Na 2 O 7.73%, Li 2 O 1.76%, F - 8.66%, MnO 5.95%, TiO 2 2.03%, BaO 9.12%. In the mold flux, the crystallization rate of the calcite feldspar crystal phase is 53%.

[0069] Preparation process: with embodiment 1.

[0070] The main physical properties of mold flux are shown in Table 1.

[0071] The amount of mold flux used for continuous casting with an Al content of 1.5wt% in the protection is added according to the existing technological level; the consumption of mold flux is reduced by 13%.

Embodiment 3

[0073] Ingredients: (CaO+BaO) / Al 2 o 3 is 1.36, (CaO+BaO) / SiO 2 2.93, CaO 27.03%, Al 2 o 3 26.25%, SiO 2 11.97%, Na 2 O 7.68%, Li 2 O 1.66%, F - 9.17%, MnO 6.29%, TiO 2 1.43%, BaO 8.12%. In the mold flux, the crystallization rate of the calcite feldspar crystal phase is 51%.

[0074] Preparation process: with embodiment 1.

[0075] The main physical properties of mold flux are shown in Table 1.

[0076] The protection medium is used for continuous casting with an Al content of 1.5wt%, and the amount of mold slag is added according to the existing technological level; the consumption of mold slag is reduced by 12%.

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Abstract

The invention discloses BaO-containing high-aluminum TRIP steel continuous casting crystallizer casting powder and an application thereof. The casting powder is prepared from the following components according to mass percent: 20% to 45% of CaO, 20% to 28% of Al2O3, 9% to 20% of SiO2, 3% to 12% of Na2O, 1% to 3% of Li2O, 5% to 10% of F<->, 5% to 10% of MnO, 1% to 3% of TiO2 and 6% to 12% of BaO, wherein (CaO+BaO) / SiO2 is equal to 2.0 to 3.5, CaO / BaO is equal to 2.0 to 4.5, (CaO+BaO) / Al2O3 is equal to 1.2 to 2.2, and MnO / BaO is equal to 0.62 to 0.975; the crystallization ratio of a gehlenite crystalline phase is 40 to 60%. The BaO-containing high-aluminum TRIP steel continuous casting crystallizer casting powder provides necessary conditions for solving the problem of steel and powder reaction of the high-aluminum steel casting powder in a continuous casting process.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to a high-alumina steel mold slag with good crystallization performance and an application thereof. Background technique [0002] With the rapid development of the automobile industry and the electrical industry and the requirements of social and technological progress, the development of advanced high-strength steels with excellent performance and different uses has attracted more and more attention. As an effective additive to improve the performance of steel, aluminum content in steel is continuously increasing, forming many high-aluminum steels with excellent properties. The content of aluminum in high aluminum steel is generally greater than 0.5%. For example, the content of Al in Al-TRIP steel is between 0.5-1.8%, which is conducive to the formation of a stable multi-phase structure of the steel matrix and the improvement of the galvanization perform...

Claims

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Application Information

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IPC IPC(8): B22D11/111B22D11/108
CPCB22D11/108B22D11/111
Inventor 王万林黄道远周乐君高尔卓张磊李欢
Owner CENT SOUTH UNIV