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Low carbon steel continuous casting crystallizer casting powder

A continuous casting mold and mold slag technology, applied in the field of flux, can solve problems such as affecting the quality of steel and increasing inclusions, and achieve the effects of reducing the probability of occurrence, increasing surface tension and high melting point

Active Publication Date: 2013-06-05
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a low-carbon steel mold mold slag, which mainly solves the technical problem of slag rolling in the continuous casting process caused by surface defects of tin plate and pickling plate, which requires the mold slag liquid slag to have a higher surface tension , so it is necessary to control Na in mold flux 2 The O content is in a lower range. After research, by adding a certain amount of Li 2 O to achieve the function of mold flux lubrication, so as to obtain low melting point mold flux; and to overcome the traditional method of adding Al2O3 in terms of increasing viscosity, because adding Al2O3 will easily lead to the increase of inclusions in the steel and affect the quality of the steel. The present invention adopts rare earth oxide cerium oxide (Ce 2 o 3 ) not only solves the problem of increasing the viscosity but also does not add inclusions to the steel

Method used

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Examples

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Embodiment Construction

[0011] The five examples are shown in the table below:

[0012] SiO 2 % CaO% Ce 2 O 3 % Li 2 O% Na 2 O% F% Element 40~44 28.5~36.5 7~11 3.6~8.2 ≤2.4 4.0～8.0 example 1 43.86 33.36 9.2 3.84 2.34 7.4 Example 2 40 36．5 10 7 1．5 5 Example 3 42 34．5 7 8．2 0.3 8 Example 4 44 28.6 11 6 2．4 8 Example 5 44 36 11 3．6 1．4 4

[0013] Example The tin-plated steel was poured on the slab continuous casting machine, the pouring section was 210mm*900~1100mm, the pulling speed was 0.9m / min~1.7m / min, the average slag consumption was 0.48Kg / ton of steel, and the thickness of the liquid slag layer was 0.48Kg / ton. 10~12mm. The test results show that the cold-rolled low carbon steel mold mold powder has good spreadability and less smoke. After adding mold powder, the mold mold powder surface is in good slag state, no sticking, no crusting and pilling, and small slag bars. The surface of the cold-rolled s...

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Abstract

The invention relates to a fusing agent for steel-making, in particular to low carbon steel continuous casting crystallizer casting powder. The low carbon steel continuous casting crystallizer casting powder mainly solves the technical problem that surface defects of a tin plate and a scouring plate cause slag entrapment during the continuous casting process. According to the technical scheme, the low carbon steel continuous casting crystallizer casting powder comprises 40-44 percents silicon dioxide, 28.5-36.5 percents calcium, 7.0-11.0 percents cerium trioxide, 3.6-8.2 percents lithium peroxide, <=2.4 percents sodium oxide and 4.0-8.0 percents fluorine. The low carbon steel continuous casting crystallizer casting powder is low in binary basicity and melting point, and high in viscosity. Meanwhile, lubricating of the casting powder is improved and surface tension of the casting powder is improved.

Description

technical field [0001] The invention relates to a flux used in steelmaking, in particular to a mold slag for continuous casting of low carbon steel. Background technique [0002] The mold slag used in steelmaking and continuous casting is used as a medium for the interaction between the mold and the billet shell. Its function is to form a stable and uniform liquid slag film between the mold and the billet shell. The improvement of its physical and chemical properties is to achieve high-efficiency continuous casting. And a key technology to improve the surface quality of products. At present, hole defects often appear in low-carbon steel cold-rolled products. The main reason is that the subcutaneous inclusions, slag entrainment, surface cracks and other defects in the slab lead to the weakening of the strength of the local area of ​​the substrate, and the holes formed during the rolling process. Improvements in the properties of mold fluxes used in continuous casting are be...

Claims

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Application Information

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IPC IPC(8): B22D11/07B22D11/11
Inventor 洪建国江中块王海军
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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