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A kind of mold slag for continuous casting mold for special-shaped billet low-carbon steel

A continuous casting crystallizer and low-carbon steel technology, applied in the field of steelmaking auxiliary materials, can solve the problems of imperfect technology, poor adaptability, unstable use process, etc., achieve good fluidity and spreadability, uniform heating and cooling, and ensure The effect of homogenization

Active Publication Date: 2018-09-14
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Imported slag cannot be effectively combined with the specific requirements and actual conditions of the domestic operation site, and its adaptability is poor, and there are still many defects in the surface quality of slabs;
[0005] (2) Most domestic steel mills do not fully realize the importance of mold slag. When casting such billets, they usually use mold slag with the same carbon content and similar process conditions for casting, and do not use special slag, resulting in abnormal-shaped billets. The performance of low carbon steel is generally lower than that of conventional steel with the same carbon content;
[0006] (3) Although some domestic mold powders are designed for this type of specific process conditions, they are mainly imitated by combining similar domestic products without in-depth exploration to obtain mature technologies, resulting in a low success rate during the test, poor process stability, and slabs Surface quality is uneven;
[0007] (4) Due to the imperfect process used in domestic slag, the performance of the slag fluctuates greatly, so it is easy to cause instability in the use process, and it is easy to cause defects such as cracks and slag inclusions
In the initial stage of development, this application also tried to use the mold powder in the continuous casting test of special-shaped billet low-carbon steel, and carried out a large number of explorations and tests on this basis, but the results were not obvious, mainly in the uneven thickness of the slag film, The longitudinal crack defect of the finished product is more obvious, and the yield is lower

Method used

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  • A kind of mold slag for continuous casting mold for special-shaped billet low-carbon steel
  • A kind of mold slag for continuous casting mold for special-shaped billet low-carbon steel

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A continuous casting mold mold powder for special-shaped billet low-carbon steel, the composition and mass percentage (%) are: CaO38.1, SiO 2 34. Fe 2 o 3 2.8, MgO5, Al 2 o 3 5.5, R 2 O5, F - 6.5, CaO / SiO 2 1.12.

[0036] The production process of the mold powder for the continuous casting mold for the above-mentioned special-shaped billet low-carbon steel comprises the following steps:

[0037] Step S1: Prepare and weigh the following raw materials in sequence: 3 parts of glass powder, 25 parts of premelt, 15 parts of fluorite powder, 8 parts of cement clinker, 4 parts of sodium fluoride, 15 parts of wollastonite, 9 parts of clay parts, 5 parts of magnesia;

[0038] Step S2: melting, melting in an electric furnace without lining water-cooled furnace wall at a temperature higher than the melting temperature of mold slag by 200° C. to obtain molten slag;

[0039]Step S3: water quenching, the slag directly enters the normal temperature water pool to cool and soli...

Embodiment 2

[0046] A continuous casting mold mold powder for special-shaped billet low-carbon steel, the composition and mass percentage (%) are: CaO46.7, SiO 2 38.9 Fe 2 o 3 0.2, MgO2, Al 2 o 3 3.5, R 2 O3, F - 4.0, CaO / SiO 2 1.20.

[0047] The production process of the mold powder for the continuous casting mold for the above-mentioned special-shaped billet low-carbon steel comprises the following steps:

[0048] Step S1: Prepare and weigh the following raw materials in sequence: 4 parts of glass powder, 40 parts of premelt, 12 parts of fluorite powder, 10 parts of cement clinker, 4 parts of sodium fluoride, 20 parts of wollastonite, 10 parts of clay part, 1 part of magnesia;

[0049] Step S2: melting, melting in an electric furnace without lining water-cooled furnace wall at a temperature higher than the melting temperature of mold slag at 220°C to obtain molten slag;

[0050] Step S3: water quenching, the slag directly enters the normal temperature water pool to cool and soli...

Embodiment 3

[0057] A continuous casting mold mold powder for special-shaped billet low-carbon steel, the composition and mass percentage (%) are: CaO46.1, SiO 2 37.5 Fe 2 o 3 0.2, MgO2.5, Al 2 o 3 4.0, R 2 O4.0, F - 4.5, CaO / SiO 2 1.23.

[0058] The production process of the mold powder for the continuous casting mold for the above-mentioned special-shaped billet low-carbon steel comprises the following steps:

[0059] Step S1: Prepare and weigh the following raw materials in sequence: 3 parts of glass powder, 35 parts of premelt, 10 parts of fluorite powder, 6 parts of cement clinker, 4 parts of sodium fluoride, 15 parts of wollastonite, and 8 parts of clay part, 3 parts of magnesia;

[0060] Step S2: melting, melting in an electric furnace without lining water-cooled furnace wall at a temperature higher than the melting temperature of mold slag at 205°C to obtain molten slag;

[0061] Step S3: water quenching, the slag directly enters the normal temperature water pool to cool a...

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Abstract

The invention provides a continuous casting mold flux for special-shaped blank low-carbon steel and belongs to the technical field of steelmaking auxiliary materials. This flux comprises, in percent by weight: 7.5-47.5% of CaO3, 34-42% of SiO2, 0.2-2.8% of Fe2O3, 2-5% of MgO, 3.5-5.5% of Al2O3, 3-7% of R2O, 4.0-8.0% of F, 1.12-1.25 of CaO / SiO2. The flux is used for continuous casting of special-shaped blank low-carbon steel, it is possible to observe the flux to flow and spread well in the mold and melt uniformly and to evenly cover molten steel level with no cluster on the level, full lubrication of a casting blank is ensured, the obtained casting blank has evidently reduced cracks, and the chance for the casting blank to crack is less than 0.10%.

Description

technical field [0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a mold slag for continuous casting molds for special-shaped billet low-carbon steel. Background technique [0002] Special-shaped billets refer to continuous casting billets with complex cross-sections other than slabs, round billets, and square billets. The special-shaped blanks are roughly divided into three categories, ordinary special-shaped blanks, near-net-shaped special-shaped blanks, and extreme near-net-shaped blanks. The most widely used special-shaped blanks are H-shaped steel I-shaped blanks. In reality, according to actual needs, the thickness of the web and flange of the special-shaped billet is determined by the reduction of the rolling mill. Irregular-shaped billet is a form of near-net-shape continuous casting, and it is an important technological innovation in the history of continuous casting. [0003] At present, there are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 王旭阳陈永彦彭会志王正英梁冠东袁中辉
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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