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Ladle castable for high nitrogen steel smelting and preparation method thereof

A technology of ladle casting and high nitrogen steel, applied in the field of ladle castables, can solve the problems of reducing the service life of refractory materials, increasing the total oxygen content of high nitrogen steel, affecting the production quality of high nitrogen steel, etc., and achieving enhanced service life and thermal conductivity. The effect of good and excellent physical and chemical properties

Active Publication Date: 2020-12-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under dynamic smelting conditions, the erosion of molten steel causes refractory materials to peel off and damage, which not only reduces the service life of refractory materials, but also affects the cleanliness of molten steel
[0004] In addition, in the process of smelting high-nitrogen steel, there is no clear specification for the selection of refractory materials. However, in the process of smelting high-nitrogen steel, conventional aluminum-magnesium refractory materials will oxidize the high-nitrogen steel and increase the The total oxygen content in the steel will increase the number of inclusions in the steel and affect the production quality of high nitrogen steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]A ladle castable for smelting high nitrogen steel and a preparation method thereof. The preparation method described in this embodiment is:

[0031]With 43~53wt% of microporous corundum particles and 19~27wt% of aluminum nitride particles as aggregates, 16~20wt% of fine microporous corundum powder, 2~4wt% of magnesium oxide powder, 2~4wt% of ρ-Al2O3Fine powder, 0.1-1wt% of monoclinic zirconia fine powder and 0.1-1.5wt% of iron nitride powder are the matrix, and the sum of the aggregate and the matrix is ​​called the raw material, and the raw material is 0.04-0.08 The organic fiber of wt%, the polycarboxylic acid water reducing agent of 0.1 to 0.5 wt% and the urea of ​​0.5 to 1 wt% are additives. First premix the matrix and the admixture, then add 4-10wt% water of the raw material, and stir for 2-4 minutes to obtain a premix; sprinkle the aggregate evenly into the mold, and then The premix is ​​poured into the mold, vibrated for forming, and kept at 110-200° C. for 12-48 hours, an...

Embodiment 2

[0034]A ladle castable for smelting high nitrogen steel and a preparation method thereof. The preparation method described in this embodiment is:

[0035]With 48~58wt% microporous corundum particles and 16~24wt% aluminum nitride particles as aggregates, 14~18wt% microporous corundum fine powder, 2~4wt% magnesium oxide powder, 2~4wt% ρ-Al2O3Fine powder, 0.1-1wt% of monoclinic zirconia fine powder and 0.1-1.5wt% of iron nitride powder are the matrix, and the sum of the aggregate and the matrix is ​​called the raw material, and the raw material is 0.04-0.08 The organic fiber of wt%, the polycarboxylic acid water reducing agent of 0.1 to 0.5 wt% and the urea of ​​0.5 to 1 wt% are additives. First premix the matrix and the admixture, then add 4-10wt% water of the raw material, and stir for 2-4 minutes to obtain a premix; sprinkle the aggregate evenly into the mold, and then The premix is ​​poured into the mold, vibrated for forming, and kept at 110-200° C. for 12-48 hours, and demolded to o...

Embodiment 3

[0038]A ladle castable for smelting high nitrogen steel and a preparation method thereof. The preparation method described in this embodiment is:

[0039]With 53~63wt% of microporous corundum particles and 13~21wt% of aluminum nitride particles as aggregates, 12~16wt% of fine microporous corundum powder, 2~4wt% of magnesium oxide powder, 2~4wt% of ρ-Al2O3Fine powder, 0.1-1wt% of monoclinic zirconia fine powder and 0.1-1.5wt% of iron nitride powder are the matrix, and the sum of the aggregate and the matrix is ​​called the raw material, and the raw material is 0.04-0.08 The organic fiber of wt%, the polycarboxylic acid water reducing agent of 0.1 to 0.5 wt% and the urea of ​​0.5 to 1 wt% are additives. First premix the matrix and the admixture, then add 4-10wt% water of the raw material, and stir for 2-4 minutes to obtain a premix; sprinkle the aggregate evenly into the mold, and then The premix is ​​poured into the mold, vibrated for forming, and kept at 110-200° C. for 12-48 hours, an...

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Abstract

The invention relates to a steel ladle castable for smelting of high-nitrogen steel and a preparation method thereof. According to a technical scheme in the invention, the steel ladle castable uses 43to 68 wt% of microporous corundum particles and 10 to 27 wt% of aluminum nitride particles as aggregate and uses 10 to 20 wt% of fine microporous corundum powder, 2 to 4 wt% of magnesium oxide micropowder, 2 to 4 wt% of fine rho-Al2O3 powder, 0.1 to 1 wt% of fine monoclinic zirconia powder and 0.1 to 1.5 wt% of iron nitride powder as a matrix, wherein the aggregate and the matrix are used as rawmaterials, organic fibers, a polycarboxylic acid water reducing agent and urea are used as additives, and the organic fibers, the polycarboxylic acid water reducing agent and urea account for 0.04 to0.08 wt%, 0.1 to 0.5 wt% and 0.5 to 1 wt% of the raw materials, respectively. The preparation method comprises the following steps: premixing the matrix and the admixtures, additionally adding water accounting for 4-10 wt% of the raw materials, and carrying out stirring to obtain a premix; and sprinkling the aggregate into a mold, pouring the premix into the mold, and then carrying out molding, drying and demoulding so as to obtain the steel ladle castable for smelting of high-nitrogen steel. The steel ladle castable prepared in the invention has the characteristics of high strength, good thermal shock resistance, erosion resistance, excellent resistance to steel slag erosion and capacity of improving the quality of high-nitrogen steel.

Description

Technical field[0001]The invention belongs to the technical field of ladle castables. Specifically, it relates to a ladle castable for smelting high nitrogen steel and a preparation method thereof.Background technique[0002]Studies have shown that ω(N)> in the ferrite matrix0.08% or ω(N) in austenite matrix>0.4% of steel is high nitrogen steel. The addition of nitrogen as a solid solution strengthening element changes the mechanical properties of steel. Studies have shown that the mechanism of sensitized intergranular corrosion of austenitic stainless steel is mainly chromium depletion theory, and the mechanism of non-sensitized intergranular corrosion is mainly the theory of impurity element segregation. The addition of nitrogen improves the resistance to sensitized intergranular corrosion of ordinary low-carbon and ultra-low-carbon austenitic stainless steels, making it widely used in many fields: in the construction industry, especially in watery environments Has higher corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/106C04B35/622B22D41/02
CPCB22D41/02C04B35/106C04B35/622C04B2235/3206C04B2235/3852C04B2235/3865C04B2235/5212C04B2235/77C04B2235/96C04B2235/9607C04B2235/9676
Inventor 黄奥王雅杰顾华志邹永顺吴慕晗张美杰
Owner WUHAN UNIV OF SCI & TECH