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Gunning material and gunning method for RH dip pipe

A dipping tube and gunning material technology, which is applied in the direction of manufacturing tools, casting molten material containers, casting equipment, etc., can solve the problems of low production efficiency, long time, poor gunning efficiency, etc., to improve adhesion rate, reduce dosage, The effect of ensuring quality

Active Publication Date: 2022-03-08
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the long time required for the repair process of the RH dip tube in the prior art, poor gunning efficiency, low production efficiency, etc. defects, thus providing a RH dip tube gunning material and gunning method

Method used

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  • Gunning material and gunning method for RH dip pipe
  • Gunning material and gunning method for RH dip pipe
  • Gunning material and gunning method for RH dip pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A RH dip tube gunning method provided in this embodiment is produced on a non-oriented silicon steel production line in a steel factory, and its RH gunning process is as follows:

[0038] After the RH treatment is completed, the empty space is broken, and the ladle is lowered to 20cm directly below the dipping tube, and it stays for 0.5min. When about 35% of the molten steel remains in the vacuum tank and the temperature of the outer wall of the RH dipping tube is 1277°C, the ladle is lowered and transported out; the gunning car starts To the working position below the RH dipping tube, the inner and outer spray guns are raised to the initial processing position by the lifting motor, and the two spray guns of the gunning machine are used to simultaneously spray and maintain the outer and inner walls of the RH dipping tube. When the gunning starts, the temperature of the outer wall of the RH dipping tube is 1192 ℃, at this time, the water distribution rate of the external ...

Embodiment 2

[0041] A RH dip tube gunning method provided in this embodiment is produced on a cold-rolled substrate production line of a steel factory, and the RH gunning process operation process is as follows:

[0042] After the RH treatment is finished, the ladle is lowered to 50cm below the dipping tube and stays for 1.5min. After the residual molten steel in the vacuum tank flows out, when the temperature of the outer wall of the RH dipping tube is 1299°C, the ladle is lowered and transported out; the gunning vehicle drives to the RH At the working position below the dipping tube, the inner and outer spray guns are lifted to the initial processing position by the lifting motor, and the two spray guns of the gunning machine are used to simultaneously repair and maintain the inner and outer walls of the RH dipping tube. The water distribution rate of the spray gun is 5%, the feeding speed is 40kg / min, the rotation speed of the spray gun itself is 5r / min, the revolution speed is 10r / min, ...

Embodiment 3

[0046] A kind of RH dip tube gunning method provided in this embodiment is produced on the automobile plate production line of a certain steel factory, and its RH gunning process operation process is as follows:

[0047] After the RH treatment is finished, the ladle is lowered to 38cm below the dipping tube and stays for 1.0min. After the residual molten steel in the vacuum tank flows out and the temperature of the outer wall of the RH dipping tube reaches 1250°C, the ladle is lowered and transported out; the gunning vehicle drives to the RH At the working position below the dipping tube, the inner and outer spray guns are raised to the initial processing position by the lifting motor, and the two spray guns of the gunning machine are used to simultaneously repair and maintain the inner and outer walls of the two RH dipping tubes. When the gunning starts, the temperature of the outer wall of the RH dipping tube is 1192°C , at this time, the water distribution rate of the spray ...

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Abstract

The invention belongs to the technical field of steel smelting, and particularly relates to an RH dip pipe gunning mix and a gunning method. According to the method, vacuum breaking is conducted after RH treatment is finished, a steel ladle descends to the position 20-50 cm below the dip pipe and stays for a certain time, the steel ladle descends and is conveyed out, and gunning repair is conducted on the inner wall and the outer wall of the RH dip pipe at the same time. By selecting the gunning material with specific composition, the adhesion rate of the gunning material is increased, the gunning quality is ensured, and the inner wall and the outer wall are simultaneously and smoothly repaired; and meanwhile, after RH treatment is finished, a buggy ladle is not immediately driven to the continuous casting side to be adjusted away, the inner wall and the outer wall of the RH dip pipe are subjected to heat preservation through the high-temperature state of molten steel, and the situation that the temperature is too low during gunning, and gunning materials are not easily sintered and adsorbed to the inner wall and the outer wall of the RH dip pipe is avoided. According to the gunning method for the RH dip pipe, the two spray guns of the gunning machine are used for conducting gunning on the inner wall and the outer wall of the RH dip pipe at the same time, the gunning quality is guaranteed, meanwhile, the RH gunning time can be greatly shortened, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a RH dipping pipe gunning material and a gunning method. Background technique [0002] With the rapid development of society and metallurgical engineering technology, all walks of life have higher and higher requirements for steel quality, and the demand for high-quality steel is increasing. To achieve precise control of steel composition, RH (Ruhrstahl Hereaeus, RH) vacuum refining treatment is an indispensable smelting step for high-end steel. RH furnace has become one of the most extensive and important out-of-furnace treatment devices in modern steel mills. It has metallurgical functions such as decarburization, deoxidation, dehydrogenation, desulfurization, heating, alloying and de-inclusion, and is widely used in silicon steel and pipeline steel. And cold-rolled substrates and other steel grades. [0003] Due to the erosion of molten steel in t...

Claims

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Application Information

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IPC IPC(8): C21C7/10B22D41/54B22D41/58
CPCC21C7/10B22D41/58B22D41/54Y02P10/20
Inventor 蔡小锋赵家七包燕平马建超王耀
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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