Sized water inlet for running castings molten steel and manufacturing technology thereof

A technology of sizing nozzles and pouring molten steel, which is applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of high raw material cost, uneven service life, bursting, etc., and achieve good thermal shock stability and reduce Raw material cost and the effect of appropriate stabilization rate

Active Publication Date: 2008-09-03
MAANSHAN IRON & STEEL CO LTD
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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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  • Sized water inlet for running castings molten steel and manufacturing technology thereof
  • Sized water inlet for running castings molten steel and manufacturing technology thereof
  • Sized water inlet for running castings molten steel and manufacturing technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 12

[0128] In the step (j), the raw materials stirred and mixed in the step (i) are added to the floor glue. The floor glue is stirred and mixed according to the step (i) and the raw material is 100% by mass, plus 1.5%±0.2%.

[0129] The addition amount of floor glue can carry out proportioning according to above table 2 during concrete implementation.

Embodiment 13

[0131] In step (k), the ingredients after adding the floor glue are mud milled and mixed. The method is to put it into a mud mill mixer, the mixing time is 45min±5min, and then discharge. The best mud mill mixing time is 45min.

Embodiment 14

[0133] In step (1), put the ingredients mixed by mud milling into a mold for producing the sizing nozzle, and make it form a blank under a high pressure of not less than 350MPa in the mold according to the product shape of the sizing nozzle. In actual production, the molding pressure can be 350MPa. After molding, let it stand for a day and dry naturally in the shade.

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PUM

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Abstract

The invention belongs to the technology field of metallurgical industrial equipment and discloses a metering nozzle for casting molten steel. A composite stabilizer is also added to raw materials before calcining the metering nozzle, and the stabilizer contains CaO, Y2O3 and MgO. The invention also discloses the manufacture process of the metering nozzle, which adopts a two-step calcination method comprising the following steps: preparing the raw materials according to a ratio, mixing, carrying out high-temperature calcination to obtain stable ZrO2, sintering, crushing, adding a binder and fused monoclinic ZrO2, shaping at high pressure according to the product shape, and carrying out another calcination. By adopting the above technical scheme, the metering nozzle improves stability and service life, and lowers calcination temperature and manufacture cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgical industrial equipment, and relates to a sizing nozzle for pouring molten steel in steelmaking equipment. At the same time, the invention also relates to the manufacturing process of the sizing nozzle for pouring molten steel. 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/50C04B35/64
Inventor 朱义文严解荣陈广言汪雷张小红任冰
Owner MAANSHAN IRON & STEEL CO LTD
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