Ladle castable for stainless steel smelting and preparation method thereof

A technology of ladle casting and stainless steel, applied in the field of ladle castables, can solve the problems of reducing the service life of refractory materials, peeling and damage of refractory materials, and unfavorable control of elements in steel, etc., to improve quality, improve thermal shock resistance and steel slag corrosion resistance. Good performance and thermal shock stability

Active Publication Date: 2020-12-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Magnesium-calcium refractory materials are mainly used in stainless steel smelting ladles. During the ladle smelting process, magnesia-carbon refractory materials play a positive role in dephosphorization and desulfurization, and can reduce the phosphorus and sulfur content in stainless steel water, but magnesium-calcium refractory materials [Ca] in the material is easy to react with free [S] in molten steel to generate CaS with high melting point, which forms inclusions in steel and affects the cleanliness of molten steel
In addition, under the erosion of molten steel, refractory materials are easy to peel off and damage, which reduces the service life of refractory materials and affects the cleanliness of molten steel
The current ladle refractory material corrodes quickly during the stainless steel smelting process, and is unfavorable to the control of elements in the steel, which restricts the production of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A ladle castable for stainless steel smelting and a preparation method thereof.

[0036] Using 43-53wt% microporous corundum particles and 19-27% magnesium-aluminum spinel particles as aggregates, 11-15wt% microporous corundum fine powder, 2-4wt% magnesium-aluminum spinel fine powder, 4 ~5wt% pseudoboehmite, 2~4wt% ρ-Al 2 o 3Fine powder, 0.1-1wt% monoclinic zirconia fine powder and 0.1-1wt% chromium powder are used as the matrix, the sum of the aggregate and the matrix is ​​the raw material; 0.04-0.08wt% of the raw material is Organic fiber, 0.1-0.5wt% polycarboxylate water reducer, 0.2-0.5wt% maleic acid and 0.01-0.03wt% defoamer are additives.

[0037] Firstly premix the base and the admixture, add 4-7wt% water of the raw material, and stir for 2-4 minutes to obtain a premix. Install the mold, sprinkle the aggregate evenly into the mold, pour the premixed material into the mold, vibrate and shape, keep warm at 110-170°C for 36-48 hours, and demould to obtain stainl...

Embodiment 2

[0040] A ladle castable for stainless steel smelting and a preparation method thereof.

[0041] 48-58wt% microporous corundum particles and 16-24wt% magnesium-aluminum spinel particles are used as aggregates, 9-13wt% microporous corundum fine powder, 2-4wt% magnesium-aluminum spinel powder, 5-6wt% pseudo-boehmite, 2-4wt% ρ-Al 2 o 3 Fine powder, 0.1-1wt% monoclinic zirconia fine powder and 0.1-1wt% chromium powder are used as the matrix, the sum of the aggregate and the matrix is ​​the raw material; 0.04-0.08wt% of the raw material is Organic fiber, 0.1-0.5wt% polycarboxylate water reducer, 0.2-0.5wt% maleic acid and 0.01-0.03wt% defoamer are additives.

[0042] Premix the base and the additive, add 5-8wt% water of the raw material, and stir for 2-4 minutes to obtain a premix. Install the mold, sprinkle the aggregate evenly into the mold, pour the premixed material into the mold, vibrate and shape, keep warm at 120-180°C for 28-40 hours, and demould to obtain stainless steel...

Embodiment 3

[0045] A ladle castable for stainless steel smelting and a preparation method thereof.

[0046] 53-63wt% microporous corundum particles and 13-21wt% magnesium-aluminum spinel particles are used as aggregates, 7-11wt% microporous corundum fine powder, 2-4wt% magnesium-aluminum spinel powder, 6-7wt% pseudo-boehmite, 2-4wt% ρ-Al 2 o 3 Fine powder, 0.1-1wt% monoclinic zirconia fine powder and 0.1-1wt% chromium powder are used as the matrix, the sum of the aggregate and the matrix is ​​the raw material; 0.04-0.08wt% of the raw material is Organic fiber, 0.1-0.5wt% polycarboxylate water reducer, 0.2-0.5wt% maleic acid and 0.01-0.03wt% defoamer are additives.

[0047] Premix the base and the additive, add 6-9 wt% water of the raw material, and stir for 2-4 minutes to obtain the premix. Install the mold, sprinkle the aggregate evenly into the mold, then pour the premixed material into the mold, vibrate and shape, keep warm at 130-190°C for 20-32 hours, and demould to obtain stainle...

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Abstract

The invention relates to a ladle casting material for stainless steel smelting and a preparation method thereof. The scheme is: 43-68wt% of microporous corundum particles and 10-27wt% of magnesium-aluminum spinel particles are aggregates, 5-15wt% of microporous corundum fine powder, 2-4wt% of magnesium-aluminum spinel Stone powder, 4-8wt% pseudo-boehmite, 2-4wt% ρ-Al 2 o 3 Fine powder, 0.1-1wt% monoclinic zirconia fine powder and 0.1-1wt% chromium powder are used as matrix, and the sum of aggregate and matrix is ​​used as raw material; raw materials are 0.04-0.08wt% organic fiber, 0.1-0.5wt% % polycarboxylate water reducer, 0.2-0.5 wt% maleic acid and 0.01-0.03 wt% defoamer are additives. Stir the matrix, admixture and water to obtain a premix; sprinkle the aggregate into a mold, then pour the premix into the mold, shape, dry, and demould to obtain a ladle castable for stainless steel smelting. The invention has high strength, good thermal shock stability, erosion resistance, excellent resistance to steel slag erosion and can improve the quality of stainless steel.

Description

technical field [0001] The invention belongs to the technical field of ladle castables. In particular, it relates to a ladle castable for stainless steel smelting and a preparation method thereof. Background technique [0002] Stainless steel refers to steel resistant to weak corrosive media such as air, steam, water, and chemically corrosive media such as acid, alkali, and salt. It is also called stainless acid-resistant steel. The chemical composition of stainless steel mainly adds alloying elements such as chromium (Cr), nickel (Ni) and manganese (Mn) to improve the physical and chemical properties of steel such as corrosion resistance, oxidation resistance and wear resistance. The content of Cr element affects the corrosion resistance of stainless steel. It is generally believed that when the content of Cr element is not less than 11.7%, the alloy steel has corrosion resistance. The chromium content of stainless steel in industry is generally required to be 12% to 30%. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/106C04B35/103
CPCC04B35/103C04B35/106C04B2235/3463C04B2235/9676
Inventor 黄奥王雅杰顾华志付绿平张美杰邹永顺
Owner WUHAN UNIV OF SCI & TECH
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