Unlock instant, AI-driven research and patent intelligence for your innovation.

Mold powder for continuous casting of aluminum-free or ultra-low aluminum steel and preparation method thereof

A technology of continuous casting mold flux and ultra-low aluminum steel, which is applied in the field of iron and steel smelting and continuous casting production, and can solve the problems of lack of new mold flux, neglect, performance deterioration, etc.

Inactive Publication Date: 2016-01-20
JIANGSU UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]With the gradual improvement of steel quality control requirements, the steel-slag reaction in the continuous casting process has begun to attract the attention of metallurgists, such as the use of ultra-low carbon steel without Carbon mold slag is used to prevent the mold slag from adding carbon to molten steel. This requires that the mold slag not only play the role of continuous casting lubrication, prevent molten steel from oxidation, and absorb gas, but also have the function of absorbing inclusions in the steel. The invention proposes a technical solution to improve the deterioration of the performance of the mold flux due to the entry of aluminum oxide in the steel into the mold flux by introducing a flux; however, some oxides in the mold flux are considered to be stable oxides in the traditional concept, thus ignoring this The influence of oxides on the quality of molten steel; alumina is one of the most harmful inclusions in steel. In the past, the research on controlling alumina inclusions in steel mainly focused on how to reduce the oxygen content in steel, but for alumina For steels that are very sensitive to inclusions, such as cord steel, bearing steel, ball steel, railway turnout steel, etc., it is far from enough to control the inclusion of alumina in the steel from the perspective of deoxidation. Therefore, it is not only necessary to reduce the oxygen content in the steel The content of aluminum in the steel should be controlled, so aluminum-free or ultra-low-aluminum steel came into being; but there is little research on aluminum-free or ultra-low-aluminum steel continuous casting mold flux, due to the aluminum oxide in the mold flux It has always been considered as a stable oxide, thus ignoring the influence of the alumina in the mold flux being reduced into the molten steel, that is, adding aluminum to the molten steel, and the alumina in the mold flux has a great influence on the melting point, viscosity and crystallization temperature of the mold flux. It has an important influence and has been widely used as an important regulator of the performance of mold flux. Recent studies have shown that when the aluminum content in steel is very low (<50ppm), the activity of alumina in mold flux is higher than a certain value After that, the alumina can be reduced by carbon and Si, Mn and other elements in the steel and enter the molten steel, thereby increasing the aluminum in the molten steel and affecting the quality of the molten steel
[0004] To sum up, there is currently a lack of new mold fluxes for continuous casting of aluminum-free or ultra-low aluminum steels, in order to reduce or control the impact of mold fluxes adding aluminum to steel Hazards to molten steel quality

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Mold powder for continuous casting of aluminum-free or ultra-low aluminum steel and preparation method thereof
  • Mold powder for continuous casting of aluminum-free or ultra-low aluminum steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The composition analysis results of the prepared mold flux are as follows (mass percentage):

[0034] CaO23.2%, BaO11.1%, SiO 2 43%, MgO2%, Fe 2 o 3 1%, MnO2%, B 2 o 3 4%, Li 2 O2%, Na 2 O4%, C5%, the rest is 2.7% of unavoidable impurities, Al in impurities 2 o 3 The mass fraction of 0.4%; the basicity of the mold flux R=(CaO+BaO) / (SiO 2 )=0.8, the main performance indicators of the mold flux prepared in this example are shown in Table 2.

Embodiment 2

[0036] The composition analysis results of the prepared mold flux are as follows (mass percentage):

[0037] CaO19.8%, BaO9.9%, SiO 2 42%, MgO2%, Fe 2 o 3 1%, MnO2%, B 2 o 3 6%, Li 2 O3%, Na 2 O6%, C7%, the rest is 1.3% of unavoidable impurities, Al in impurities 2 o 3 The mass fraction of 0.3%; the basicity of the mold flux R=(CaO+BaO) / (SiO 2 )=0.7, the main performance indicators of the mold flux prepared in this example are shown in Table 2.

Embodiment 3

[0039] The composition analysis results of the prepared mold flux are as follows (mass percentage):

[0040] CaO27.1%, BaO13.6%, SiO 2 45.2%, MgO1%, Fe 2 o 3 1%, MnO2%, B 2 o 3 2%, Li 2 O1%, Na 2 O2%, C3%, the rest is 2.1% of unavoidable impurities, Al in impurities 2 o 3 The mass fraction of 0.4%; the basicity of the mold flux R=(CaO+BaO) / (SiO 2 )=0.9, the main performance indicators of the mold flux prepared in this example are shown in Table 2.

[0041] Table 2 embodiment result-physical and chemical performance index

[0042]

[0043] From the performance results of the mold flux prepared in the examples, it can be seen that the composition index and the physical and chemical performance index of the mold flux of the present invention all meet the requirements, and the cast aluminum content is 0.004% ultra-low aluminum steel, the consumption of mold slag is 0.45-0.60kg / t per ton of steel, which meets the lubrication requirements, the mold slag layer on the sur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention belongs to the steel smelting continuous casting production technology, and specifically refers to a method of protecting the residue and preparation method of an aluminum -free or ultra -low -aluminum steel -steel steel continuous casting.First the ingredients are fully dry and dehydrated, and the ingredients are weighed according to the weight score. After the mix, the pre-melted at 1300-1400 ° C. After the pre-frozen slag is cooled, grind the pulp and grind it.The tower is prepared to prepare a pre-molten hollow particles protection residue; the advantage of the present invention is that the protection residue does not contain alumina, control the steel-slag reaction does not add aluminum to the steel, and the protective residue of the present invention has a strong absorption steel absorption steel in the steel.The ability of alumina for aluminum is suitable for the connection of aluminum -free or ultra -low aluminum steel that is strictly limited by steel content; in addition, the melting point, melting speed, viscosity, and crystal temperature of the present invention also meets the aluminum -free or ultra -low aluminum aluminum.The requirements of steel -casting have the advantages of fluoride -free environmental protection, wide source of raw materials, simple preparation methods, and significant economic and social benefits.

Description

technical field [0001] The invention belongs to the iron and steel smelting continuous casting production technology, in particular to an aluminum-free or ultra-low aluminum steel continuous casting mold slag and a preparation method. Background technique [0002] The continuous casting technology has been highly valued by the metallurgical industry for its advantages of high efficiency, energy saving, high quality, easy automation and intelligence, and the corresponding continuous casting mold powder has also been developed accordingly, and has become an indispensable lack of metallurgical auxiliary materials; the existing continuous casting mold flux mainly uses SiO 2 -Al 2 o 3 -CaO slag system, on this basis, add a small amount of flux (alkali metal or alkaline earth metal oxide, fluoride, boride, etc.) and carbonaceous materials (carbon black, graphite, coke, etc.) Slag has a lower melting point and viscosity, and has the advantages of good lubricating effect of glass...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111B22D11/07
Inventor 李桂荣王宏明赵钊李兵
Owner JIANGSU UNIV