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High-casting speed mold flux

A technology of mold flux and high casting speed, which is applied to the protection of high casting speed molds. , In the field of mold powder with high casting speed, it can solve the problem of high mold bonding alarm rate, achieve the effect of enhancing meniscus heat transfer, improving inflow conditions, and improving lubricating performance

Inactive Publication Date: 2010-11-17
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a high-speed casting mold mold powder, which mainly solves the technical problem of high mold bonding alarm rate in the process of continuous casting of peritectic steel by high-speed slab casters under the condition of electromagnetic braking

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Mold flux chemical composition: CaO 40.3%, SiO 2 33.2%, li 2 O 0.8%, Na 2 O 8.6%, F - 5.5%, B 2 o 3 1.2%, MgO 2.5%, Al 2 o 3 4.5%, Fe 2 o 3 0.6%, C 2.8%. Mold flux physical properties: melting point 1083°C, viscosity 0.079Pa·S at 1300°C, solidification temperature 1122°C.

Embodiment 2

[0035] Example 2: Mold flux chemical composition: CaO 39.8%, SiO 2 33.8%, li 2 O 0.9%, Na 2 O 8.3%, F - 5.6%, B 2 o 3 1.0%, MgO 2.9%, Al 2 o 3 4.3%, Fe 2 o 3 0.7%, C 2.7%. Mold flux physical properties: melting point 1074°C, viscosity 0.083Pa·S at 1300°C, solidification temperature 1116°C.

Embodiment 3

[0036] Example 3: Mold flux chemical composition: CaO 40.6%, SiO 2 32.7%, li 2 O 0.7%, Na 2 O 9.1%, F - 5.2%, B 2 o 3 O.9%, MgO 2.5%, Al 2 o 3 4.7%, Fe 2 o 3 0.8%, C 2.8%. Mold flux physical properties: melting point 1086°C, viscosity 0.072Pa·S at 1300°C, solidification temperature 1128°C.

[0037] Examples 1 to 3 cast peritectic steel on the slab continuous casting machine, the pouring section is 210mm×900~1200mm, the slag consumption is 0.56kg / T steel when the casting speed is 1.4m / min., and the liquid slag layer thickness on the surface of molten steel 9 ~ 10mm. The test results show that when the mold slag is used, it has good spreadability, heat preservation and melting performance in the mold, the heat transfer of the four surfaces in the mold is stable and uniform, and the surface quality of the slab is good; the consumption of the mold slag is lower than that of the original slag. Increased by 10%, crystallizer heat transfer increased by 5%, crystallize...

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Abstract

The invention relates to a continuous casting mold flux, in particular to a high-casting speed mold flux, which solves the problem that the flux consumption is low and the mold bonding alarm rate is high when the casting speed is higher than 1.2 m / min in the prior art. The high-casting speed mold flux comprises the following components in percentage by weight: 32.0 to 34.0 percent of SiO2, 39.0 to 41.0 percent of CaO, 4.0 to 5.0 percent of Al2O3, 7.5 to 9.5 percent of Na2O, 5.0 to 6.0 percent of F, 2.0 to 3.0 percent of MgO, 0.5 to 1.5 percent of Fe2O3, 2.5 to 3.0 percent of C, 0.7 to 1.0 percent of Li2O and 0.9 to 1.4 percent of B2O3. A binary basicity (CaO / SiO2) in the flux is 1.15 to 1.25. The high-casting speed mold flux is mainly used for protecting the high-casting speed mold for slab caster continuous casting peritectic steel under electromagnetic brake technology.

Description

Technical field: [0001] The invention relates to continuous casting mold mold flux, in particular to a high-speed casting mold mold flux, which is mainly used for high-speed casting mold protection of slab casters for continuous casting of peritectic steel under electromagnetic braking technology. Background technique: [0002] At present, high-efficiency continuous casting still represents the mainstream technology direction of continuous casting development. The so-called high-efficiency continuous casting usually refers to the continuous casting system technology with higher production efficiency than conventional continuous casting, with high casting speed as the core, high-quality, defect-free slab production as the basis, and high continuous casting rate and high operation rate. Its core is high pulling speed technology. However, the realization of high-speed continuous casting technology has brought many new problems to the continuous casting process. One of them is ...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 李玉娣文光华江中块唐萍
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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