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, improving surface tension and high melting point

Active Publication Date: 2015-06-03
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Application Information

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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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Embodiment Construction

[0011] Five embodiments are shown in the following table:

[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 Tin-plated steel is poured on a slab continuous casting machine, the pouring section is 210mm*900-1100mm, the casting speed is 0.9m / min-1.7m / min, the average slag consumption is 0.48Kg / ton of steel, and the thickness of the liquid slag layer 10~12mm. The test results show that the mold slag of the cold-rolled low-carbon steel mold has good spreadability and less smoke. After adding the mold slag, the slag surface of the mold is in good condition, no bonding occurs, no crusting and pilling, and the slag is small. The surface of the cold-rolled steel shee...

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PUM

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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 mold flux for continuous casting of low carbon steel. Background technique [0002] The mold flux used in steelmaking and continuous casting is used as the 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 strength of the local area of ​​the substrate is weakened due to defects such as subcutaneous inclusions, slag rolls, and surface cracks in the slab. The holes formed during the rolling process, and steelmaking The improvement of the performance of mold flux used in continuous casting is hel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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