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A method of RH thermal bending tube prevention control method

A control method and hot-bending technology, applied in the field of metallurgy, can solve the problem of steel slag easily sticking in the hot-bending pipe, etc., and achieve the effect of avoiding cooling and bonding and avoiding the clogging of the elbow.

Active Publication Date: 2020-08-14
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an anti-blocking control method for RH hot bending pipes, which solves the technical problem that the steel slag splashed in the vacuum chamber is easily bonded in the hot bending pipes during the RH vacuum decarburization process in the prior art

Method used

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  • A method of RH thermal bending tube prevention control method

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Effect test

example 1

[0068] For a furnace of ultra-low carbon steel smelting, the ladle enters the station, the bottom blowing is turned on, the ladle is moved to the lifting waiting position, the circulating gas is switched to Ar gas, the ladle is lifted to the RH processing position, and the slag thickness, temperature measurement, sampling, and constant temperature are measured. Oxygen, the RH arrival temperature is 1637°C, the arrival C content is 0.0388%, select mode 3, the arrival oxygen content is 511ppm, pre-vacuumize, the top gun is lowered to the position of 9.9m, and the vacuum valve is opened to start vacuuming to 350mbar. The top gun starts to blow oxygen, the flow rate is 800Nm 3 / h oxygen blowing 1min, 1200Nm 3 / h oxygen blowing 1min, 1000Nm 3 / h Oxygen blowing for 1min, after the end of oxygen blowing, the top gun is automatically raised to the waiting position.

example 2

[0070] For a furnace of ultra-low carbon steel smelting, the ladle enters the station, the bottom blowing is turned on, the ladle is moved to the lifting waiting position, the circulating gas is switched to Ar gas, the ladle is lifted to the RH processing position, and the slag thickness, temperature measurement, sampling, and constant temperature are measured. Oxygen, the RH arrival temperature is 1,607°C, the arrival C content is 0.031%, select mode 2, the arrival oxygen content is 605ppm, pre-vacuumize, the top gun is lowered to the position of 9.9m, and the vacuum valve is opened to start vacuuming to 350mbar. The top gun starts to blow oxygen, the flow rate is 800Nm 3 / h oxygen blowing 1min, 1200Nm 3 / h oxygen blowing 1min, 800Nm 3 / h Oxygen blowing for 1min, after the end of oxygen blowing, the top gun is automatically raised to the waiting position.

example 3

[0072] For a furnace of ultra-low carbon steel smelting, the ladle enters the station, the bottom blowing is turned on, the ladle is moved to the lifting waiting position, the circulating gas is switched to Ar gas, the ladle is lifted to the RH processing position, and the slag thickness, temperature measurement, sampling, and constant temperature are measured. Oxygen, the RH arrival temperature is 1,615°C, the arrival C content is 0.023%, select mode 1, the arrival oxygen content is 650ppm, pre-vacuumize, the top gun is lowered to the position of 9.9m, and the vacuum valve is opened to start vacuuming to 350mbar. The top gun starts to blow oxygen, the flow rate is 800Nm 3 / h oxygen blowing 1min, 1100Nm 3 / h oxygen blowing 1min, 500Nm 3 / h Oxygen blowing for 1min, after the end of oxygen blowing, the top gun is automatically raised to the waiting position.

[0073] Through the comparison of the service life of a hot top cover, the slag accumulation of the hot bend pipe is ef...

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Abstract

The invention belongs to the technical field of metallurgy, and discloses an RH hot bent pipe anti-blocking control method. The method comprises the following steps of in the RH vacuum decarburizationprocess, through RH top gun oxygen supply, carbon monoxide generated through decarburization realizes the sufficient combustion in the hot bent pipe position through gun position and oxygen supply flow rate control; the combustion heat effect of carbon monoxide is used for improving the hot bent pipe refractory surface temperature; sprayed and sputtered liquid drips are prevented from being adhered onto the hot bent pipe refractory. The RH hot bent pipe anti-blocking control method provided by the invention has the advantages that the refractory temperature of the hot bent pipe can be improved through the reliable directional combustion heat effect; the hot bent pipe blockage due to steel slag bonding can be avoided.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an anti-blocking control method for RH hot-bent pipes. Background technique [0002] In the RH vacuum decarburization process, due to the violent reaction of carbon and oxygen, the stirring of the circulating gas and the suction of the vacuum pump, the steel slag splashed in the vacuum chamber is easily bonded to the hot bending pipe, and as the hot bending pipe is used online The extension of the time, the bonding becomes more and more serious, causing the vacuum pumping channel to be blocked, which seriously affects the decarburization efficiency, makes decarburization difficult, and ultimately affects the production efficiency. Contents of the invention [0003] The invention provides an anti-blocking control method for RH hot bending pipes, which solves the technical problem in the prior art that steel slag splashed in a vacuum chamber is easily bonded in the hot bending...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10
CPCC21C7/10
Inventor 刘道正毛锋陈建光贾毅马文俊赵彦伟毕泽阳赵艳宇
Owner BEIJING SHOUGANG CO LTD