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High-alkalinity high-lubricity continuous casting crystallizer casting powder and method for performing continuous casting on peritectic steel slab

A continuous casting crystallizer and mold slag technology, which is applied in the field of continuous casting technology, can solve problems such as longitudinal crack defects and surface longitudinal crack defects of peritectic steel slabs, improve crystallinity, improve lubricity, and control meniscus The effect of heat transfer

Inactive Publication Date: 2014-08-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-alkalinity and high-lubricity continuous casting mold mold slag in order to ensure that the process of continuous casting of peritectic steel with wide and thick slabs runs smoothly, alleviate or solve the problem of serious longitudinal crack defects on the surface of peritectic steel slabs and a method for continuous casting of peritectic steel slabs
That is, it can alleviate or solve the problem of serious longitudinal crack defects on the surface of peritectic steel slabs, and can ensure the continuous casting of peritectic steel in wide and thick slabs.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0020] In the preparation method of the mold flux of the present invention, each component is proportioned according to the mold flux components. Wherein, using 90-120 parts by weight of pre-melted slag, 2-8 parts by weight of sodium carbonate, 2-8 parts by weight of potassium carbonate, 4-10 parts by weight of fluorite, 2-8 parts by weight of white clay, 2 - 10 parts by weight of cement clinker, 2-8 parts by weight of lithium carbonate, 1-5 parts by weight of carbon black and 2-10 parts by weight of graphite, which can be prepared with an alkalinity of 1.40-1.90 and a viscosity at 1300 ° C Mold flux of 0.02-0.15Pa·S and melting point of 1020-1150℃. Preferably, use 100-110 parts by weight of pre-melted slag, 2-7 parts by weight of sodium carbonate, 2-7 parts by weight of potassium carbonate, 4-8 parts by weight of fluorite, and 3-6 parts by weight of white mud , 3-8 parts by weight of cement clinker, 3-7 parts by weight of lithium carbonate, 1-4 parts by weight of carbon blac...

Embodiment 1

[0033] This example is used to illustrate the high-alkalinity and high-lubricity continuous casting mold flux provided by the present invention.

[0034] After uniformly mixing 100 kg of pre-melted slag, 4 kg of sodium carbonate, 3 kg of potassium carbonate, 5 kg of fluorite, 5 kg of cement clinker, 4 kg of white mud and 6 kg of lithium carbonate, the It is melted, then water-cooled, crushed and finely ground to produce intermediate particles with a particle diameter of 5-60 microns. Then the intermediate particle slag is mixed with 5 kg of carbon black and 5 kg of graphite, mixed uniformly with a stirrer, then water is added, and the resulting mixture is made into a slurry with a concentration of 20% by weight using a ball mill. Under the conditions of MPa, air inlet temperature of 800°C, exhaust gas temperature of 200°C, and nozzle diameter of 2 mm, the slurry is sent to the spray granulation drying tower through a pressure pump for granulation and drying, and then screened ...

Embodiment 2

[0036] This example is used to illustrate the high-alkalinity and high-lubricity continuous casting mold flux provided by the present invention.

[0037]After uniformly mixing 110 kg of pre-melted slag, 8 kg of cement clinker, 2 kg of sodium carbonate, 7 kg of potassium carbonate, 8 kg of fluorite, 3 kg of white mud and 7 kg of lithium carbonate, the It is melted, then water-cooled, crushed and finely ground to produce intermediate particles with a particle diameter of 5-60 microns. Then the intermediate particle slag is mixed with 4 kilograms of carbon black and 8 kilograms of graphite, mixed uniformly with a stirrer, then water is added, and the resulting mixture is made into a slurry with a concentration of 20% by weight using a ball mill, and finally at a pressure of 2 Under the conditions of MPa, air inlet temperature of 800°C, exhaust gas temperature of 200°C, and nozzle diameter of 2 mm, the slurry is sent to the spray granulation drying tower through a pressure pump fo...

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Abstract

The invention discloses high-alkalinity high-lubricity continuous casting crystallizer casting powder. The casting powder comprises CaO, SiO2, Al2O3, MgO, Na2O, K2O, Li2O, F- and C. The alkalinity of the casting powder is 1.40-1.90. The viscosity of the casting powder is 0.02 Pa.S-0.15 Pa.S at 1300 DEG C. The fusion point of the casting powder is 1020 DEG C-1150 DEG C. The invention further provides a method for performing continuous casting on a peritectic steel slab under the condition that the high-alkalinity high-lubricity continuous casting crystallizer casting powder exists. In this way, not only is the crystallinity of the casting powder improved, but also the lubricity of the casting powder is improved. In addition, the defect of longitudinal cracks on the surface of the peritectic steel slab is remarkably overcome in the continuous casting process of the peritectic steel slab, and the problem of steel sticking and break-out of the crystallizer due to casting powder does not happen.

Description

technical field [0001] The invention belongs to the technical field of continuous casting technology, and in particular relates to a high-alkalinity and high-lubricity continuous casting crystallizer mold flux and a method for continuous casting of peritectic steel slabs. Background technique [0002] Compared with the conventional slab, the width-thickness ratio of the wide-thick slab continuous casting machine is large. During the solidification process, there is a large tensile stress along the horizontal direction of the wide side, and it increases with the increase of the width of the slab. Therefore, it is easy to Defects such as surface longitudinal cracks occur; with the increase of the section of the billet, the fluctuation of the liquid level of the crystallizer becomes larger, and the billet is prone to quality defects such as surface longitudinal cracks and subcutaneous slag inclusions. In addition, the carbon content of peritectic steel is generally 0.08%-0.18% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 潘红吴国荣曾建华李志强李明红杨晓东唐生斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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