Preparation method for sizing nozzle used for continuous casting

A sizing nozzle and continuous casting technology, applied in the field of iron and steel metallurgy, can solve the problems of short service life, bursting, different service life, etc., and achieve the effect of improving service life, prolonging service life and small diameter expansion of the nozzle.

Inactive Publication Date: 2014-05-07
WUXI SHENJIA HYDRAULIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the service life of the same batch of sizing nozzles produced by the same manufacturer varies during use, and may even burst.
[0006] Second, the product is more difficult to sinter
95%-ZrO fired at 1700°C 2 The physical properties of the sizing nozzle are generally: bulk density 4.20 ~ 4.50g / cm 3 , the apparent porosity is 18-26%, due to this 95%-ZrO 2 The volume density of the sizing nozzle is low, the apparent porosity is high, it is not resistant to the erosion and erosion of molten steel, the diameter of the nozzle expands seriously during use, and the service life is short
[0007] Third, the cost of raw materials is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a sizing nozzle for continuous casting, the raw material of the sizing nozzle is composed of the following components in terms of weight fraction: 26 parts of 0.5-5 μm monoclinic zirconia, 42 parts of 6 μm-25 μm monoclinic zirconia, 26- 16 parts of 60μm monoclinic zirconia, 8 parts of magnesia stabilized zirconia, ZrO 2 -Al 2 o 3 4 parts of composite material, described preparation method comprises the steps:

[0020] 1) ZrO 2 -Al 2 o 3 Composite material preparation: get ZrOCl by weight percentage 2 .8H 2 O:Al(NO 3 ) 3 .9H 2 O=90:10, prepare mother liquor, mother liquor concentration 1.0Mol / L, add the dispersant of 1.2% of material gross weight, NH 4 OH is positively titrated, stirred to pH=7-10, and the composite gel is prepared; the composite gel is aged for 18 hours, vacuum-filtered at 0.095MPa, washed with deionized water until silver nitrate cannot detect Cl - Then react at 500°C for 2h, the temperature rises to 700°C, react for 1...

Embodiment 2

[0025] A method for preparing a sizing nozzle for continuous casting. The raw materials of the sizing nozzle are composed of the following components in terms of weight fractions: 28 parts of 0.5-5 μm monoclinic zirconia, 38 parts of 6-25 μm monoclinic zirconia, 26- 18 parts of 60μm monoclinic zirconia, 6 parts of magnesia stabilized zirconia, ZrO 2 -Al 2 o 3 6 parts of composite material, described preparation method comprises the steps:

[0026] 1) ZrO 2 -Al 2 o 3 Composite material preparation: get ZrOCl by weight percentage 2 .8H 2 O:Al(NO 3 ) 3 .9H 2 O=90:10, prepare mother liquor, mother liquor concentration 2.0Mol / L, add the dispersant of 1.2% of material gross weight, NH 4 OH is positively titrated, stirred to pH=7-10, and the composite gel is prepared; the composite gel is aged for 24 hours, vacuum-filtered at 0.095MPa, washed with deionized water until silver nitrate cannot detect Cl - Then react at 500°C for 2h, the temperature rises to 700°C, react for 1...

Embodiment 3

[0031] A method for preparing a sizing nozzle for continuous casting. The raw materials of the sizing nozzle are composed of the following components in terms of weight fractions: 27 parts of 0.5-5 μm monoclinic zirconia, 40 parts of 6-25 μm monoclinic zirconia, 26- 17 parts of 60μm monoclinic zirconia, 7 parts of magnesia stabilized zirconia, ZrO 2 -Al 2 o 3 5 parts of composite material, described preparation method comprises the steps:

[0032] 1) ZrO 2 -Al 2 o 3 Composite material preparation: get ZrOCl by weight percentage 2 .8H 2 O:Al(NO 3 ) 3 .9H 2 O=90:10, prepare mother liquor, mother liquor concentration 1.5Mol / L, add the dispersant of material gross weight 1.2%, NH 4 OH is positively titrated, stirred to pH = 7-10, and the composite gel is prepared; the composite gel is aged for 21 hours, 0.095MPa vacuum suction filter, washed with deionized water until the silver nitrate cannot detect Cl - Then react at 500°C for 2h, the temperature rises to 700°C, react...

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Abstract

The invention discloses a preparation method for a sizing nozzle used for continuous casting. The sizing nozzle is prepared from the following raw materials by weight: 26 to 28 parts of monoclinic zirconia with a particle size of 0.5 to 5 mu m, 38 to 42 parts of monoclinic zirconia with a particle size of 6 to 25 mu m, 16 to 18 parts of monoclinic zirconia with a particle size of 26 to 60 mu m, 6 to 8 parts of magnesia stabilized zirconia and 4 to 6 parts of a ZrO2-Al2O3 composite material. The preparation method comprises the following steps: 1) preparing the ZrO2-Al2O3 composite material; 2) preparing magnesia stabilized zirconia; 3) carrying out mixing and grinding, isostatic compaction and drying; and 4) carrying out two-step sintering at a temperature of 1740 to 1760 DEG C, i.e., carrying out sintering at a temperature of 1740 DEG C for 2 h, then carrying out cooling in a furnace to less than 1300 DEG C, carrying out heating to a temperature of 1760 DEG C when internal micro-cracks occur and carrying out sintering for 4 to 5 h.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a sizing nozzle for continuous casting. Background technique [0002] In steelmaking equipment, the sizing nozzle for pouring molten steel is located at the lower part of the continuous casting tundish. The installation process of the sizing nozzle is: firstly, the nozzle and the high-aluminum jacket are bonded with refractory cement to form a composite sizing nozzle, and then installed in the tap hole seat brick at the lower part of the tundish. During production, the molten steel flows from the ladle into the tundish, and flows to the continuous casting mold through the sizing nozzle. With 95%-ZrO 2 The sizing nozzle made of (zirconia) has good resistance to molten steel erosion and corrosion resistance, and can keep the aperture stable for a long time during use, so that the speed of molten steel flowing to the mold is relatively stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/482C04B35/66C04B35/622
Inventor 沈志坚
Owner WUXI SHENJIA HYDRAULIC TECH
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