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ZrO2-contained vehicle TWIP steel protection slag and application thereof

A technology of mold flux and continuous casting mold flux, which is applied in the field of mold flux for TWIP steel containing ZrO2, can solve the problems of slag inclusion in steel, instability, poor glass performance, etc., and achieve the suppression of the formation of coarse columnar crystals and good melting Effect of temperature and viscosity, ensuring stability and uniformity

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, in the process of slag-steel reaction, a large amount of Al will be produced 2 o 3 At the same time, the violent slag-steel reaction will also cause the instability of the mold slag, and slag inclusions in the steel will occur, making the continuous casting process unable to proceed smoothly, and cracks and other defects are prone to appear on the surface of the slab
Chinese patent CN105562641A discloses mold slag suitable for high manganese and high aluminum steel. 2 o 3 content is too high and SiO 2 The low content of mold slag will lead to higher melting point of mold slag and poor glass performance, and the slag is the main crystal phase C precipitated 12 A 7 It is not stable, and at the same time, CA and C will be precipitated 3 High melting point crystal phases such as A make the crystallization phase of the slag system more complex, which is not conducive to the control of heat flow in the mold during continuous casting, and also deteriorates the lubricating performance of mold flux
Chinese patent CN104607608A discloses mold slag of medium manganese steel for automobiles, the slag contains an appropriate amount of Al 2 o 3 and SiO 2 , but when the slag is in use, the stability of its physical and chemical properties needs to be further improved

Method used

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  • ZrO2-contained vehicle TWIP steel protection slag and application thereof
  • ZrO2-contained vehicle TWIP steel protection slag and application thereof
  • ZrO2-contained vehicle TWIP steel protection slag and application thereof

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Experimental program
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Effect test

Embodiment 1

[0050] Ingredients: (CaO+BaO) / Al 2 o 3 1.52, CaO 29.11%, SiO 2 12.2%, Al 2 o 3 23.69%, Na 2 O8.7%, Li 2 O 3.6%, BaO 6.9%, MnO 4.3%, F - 9.4%, ZrO 2 2.1%.

[0051] 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.

[0052] The main physical properties of mold flux are shown in Table 1.

Embodiment 2

[0054] Ingredients: (CaO+BaO) / Al 2 o 3 1.49, CaO 28.89%, SiO 2 12.4%, Al 2 o 3 23.61%, Na 2 O8.8%, Li 2 O 3.2%, BaO 6.3%, MnO 4.6%, F - 9.8%, ZrO 2 2.4%.

[0055] Preparation process: with embodiment 1.

[0056] The main physical properties of mold flux are shown in Table 1.

Embodiment 3

[0058] Ingredients: (CaO+BaO) / Al 2 o 3 1.54, CaO 28.16%, SiO 2 13.2%, Al 2 o 3 22.64%, Na 2 O9.1%, Li 2 O 3.9%, BaO 6.7%, MnO 4.4%, F - 9.3%, ZrO 2 2.6%.

[0059] Preparation process: with embodiment 1.

[0060] The main physical properties of mold flux are shown in Table 1.

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Abstract

The invention discloses ZrO2-contained vehicle TWIP steel continuous casting crystallizer protection slag and application thereof. The protection slag consists of the following oxide components in percentage by mass: 20-40% of CaO, 8-20% of SiO, 13-30% of Al2O3, 5-12% of Na2O, 1-6% of Li2O, 3-16% of BaO, 2-8% of MnO2, 4-13% of F-, 1.5-3.5% of ZrO2, 1.3-2.4 of (CaO+BaO) / Al2O3, 1.9-2.5 of CaO / SiO2, and 1.6-2.2 of Al2O3 / SiO2. The protection slag can be preferably applied to the continuous casting process of TWIP steel with 15-25 mass% of Mn and 2-4 mass% of Al.

Description

technical field [0001] The present invention relates to a kind of containing ZrO 2 The invention relates to TWIP steel mold slag for automobiles and its application; it belongs to the technical field of iron and steel continuous casting. Background technique [0002] With the rapid development of the automobile industry, ultra-high-strength steel has become a research hotspot and has attracted widespread attention at home and abroad. In order to obtain ultra-high strength and good plasticity of automotive steel, Mn and Al elements are added to the automotive steel in an appropriate amount. Typical automotive steels at this stage include second-generation automotive steels such as TRIP and TWIP, which not only have high strength and formability, but also have a good ability to absorb impact energy. Recently, medium manganese steel, which is very likely to become the third-generation automotive steel, has received widespread attention. It has both the ultra-high strength and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 王万林黄道远高尔卓周乐君李欢张磊朱晨阳
Owner CENT SOUTH UNIV
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