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Non-oxide enhanced material for slag line of submersed nozzle

A non-oxide, immersion-type technology, applied in the direction of casting melt containers, metal processing equipment, casting equipment, etc., can solve the problems of slag line erosion damage, fracture, slag line erosion, etc., to reduce liquid level fluctuations, high Thermal conductivity, the effect of reducing carbon increase

Active Publication Date: 2013-09-11
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] ZrO is used at the slag line of the existing submerged nozzle 2 - The slag line erosion damage of C material is mainly manifested in the severe local erosion at the slag line, forming necking, and breaking in severe cases

Method used

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  • Non-oxide enhanced material for slag line of submersed nozzle

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with specific examples.

[0023] Raise ZrO 2 For the stability of raw materials, the raw material particle size grade of stabilized zirconia is changed from the original three grades to four grades, so that the binding force between the bulk density and various raw materials at high temperature is improved, and the medium size of refractory aggregate is filled. Relatively large pores can reduce the penetration of mold slag and molten steel into the submerged nozzle.

[0024] With stabilized zirconia and flake graphite as the main raw materials, Y 2 o 3 -PSZ, O'-Sialon and zirconium boride and appropriate amount of metal aluminum powder are used as additives, modified phenolic resin is used as binder, and samples are prepared according to the ratio in Table 1. After fully mixing in the mixer for 30 minutes, Add an appropriate amount of alcohol and continue mixing until the expected granulation effect...

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Abstract

The invention relates to a submersed nozzle for steel making and continuous casting tundish, in particular to a non-oxide enhanced material for a slag line of a submersed nozzle. The material comprises the components in percentage by mass as follows: 5.5%-8% of ZrB2, 75%-78% of m-ZrO2, 6%-8% of graphite, 2%-3% of Al, 5%-6.5% of O'-Sialon, 1.0%-2.0% of Y2O3-PSZ and the balance of impurities; and 8-10% of a modified resin binding agent is additionally added. The non-oxide enhanced material for the slag line of the submersed nozzle has excellent corrosion resistance and plugging resistance, can effectively reduce carbureting of molten steel, and is more suitable for producing low -carbon steel and ultra-low carbon steel.

Description

technical field [0001] The invention relates to a submerged nozzle for steelmaking and continuous casting tundish. Background technique [0002] As a key functional refractory material for continuous casting, the submerged nozzle is the last functional refractory product for continuous casting connecting the tundish and mold. During continuous casting production, the service life of the submerged nozzle is mainly restricted by factors such as thermal shock resistance, mechanical strength, high temperature molten steel erosion resistance, slag erosion resistance and anti-clogging performance to ensure smooth passage of molten steel. [0003] The submerged nozzle for continuous casting is prone to produce A1 2 o 3 The attachment seriously affects and limits the efficiency and quality of continuous casting production. The blockage of the submerged nozzle will force the casting speed to decrease, lack of flow and even stop casting, which will not only affect the productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/54
Inventor 于燕文牟济宁
Owner BAOSHAN IRON & STEEL CO LTD
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