Method for controlling and treating bottom roller dross of carbon sleeve furnace

A processing method and furnace bottom roller technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of prone to nodules, reduce non-faulty carbon sleeve treatment, difficult to judge and deal with, and shorten the treatment time. , Reduce the difference in running speed and reduce the effect of nodules

Active Publication Date: 2010-12-08
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of control processing method of carbon sleeve hearth roll nodules, by preventing, controlling carbon sleeve hearth rolls to produce nodules, and to the timely processing of carbon sleeve hearth rolls that produce nodules, solve the problem of carbon Nodules are easy to appear on the furnace hearth roll at high temperature, and it is difficult to judge and deal with problems after nodules, reducing the unit operation rate drop and resource waste caused by the treatment of carbon nodules, and reducing the treatment of non-faulty carbon sleeves. Delay carbon sleeve life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. In the original production of 50AW 600 grades, it was easy to produce nodules and chromium printing defects. During a certain production process, the current of each brush roller was controlled to be 17A, and the surface of the strip steel was observed from the outlet of the alkali cleaning section. No stains were seen.

[0026] 2. The number of use of the transition volume is not more than 20 times.

[0027] 3. The process speed is 1.9m / s, the process temperature is greater than 900°C, the pressure difference in the control furnace is 13Pa, the dew point is 23°C, H 2 Concentration 22%.

[0028] 4. During the production process, the inspection found that the torque of the 37# and 62# hearth rollers exceeded the set value by 12.4% and 14.5%. Use the speedometer to measure the actual line speed is 0.4m / min, 0.67m / min higher than the set speed. After reducing the output of the transmission motor, the torque is 4.2 and 4.05 respectively, and the difference between the...

Embodiment 2

[0031] 1. The current of each roll in the alkali washing section is 17A, and the surface of the steel strip is observed from the outlet of the alkali washing section to be smooth, with no obvious impurities remaining, and no stains after wiping.

[0032] 2. Use the transition volume online no more than 20 times. When different steel quality changes during the production process, the temperature change rate is controlled at 2°C / min; the speed change gradient is controlled at 2m / min.

[0033] 3. When producing 50AW470 grade silicon steel, the process temperature is 910°C, the pressure difference in the furnace is controlled at 12Pa, the dew point is 25°C, and the H 2 Concentration 23%. After 6 hours of continuous production, 2 spots / m appeared on the surface of the steel plate 2 Chromium pit with a depth of about 0.7mm and a period of 563mm. First, increase the rotation speed of the hearth roll by 10% in sections, and measure the chrome printing cycle. When increasing the sp...

Embodiment 3

[0035] 1. When producing 50AW600 silicon steel, the process temperature is 870°C, the pressure difference in the furnace is controlled at 9Pa, the dew point is 17°C, and the H 2 Concentration 19%. After 40 hours of continuous production, 7 spots / m appeared on the surface of the steel plate 2 Chromium pits, about 0.7mm in depth, without obvious periodicity.

[0036] 2. Stop normal production and pass in cold-rolled transition coils with a thickness of 0.7mm. When the furnace temperature is 720°C, the strip steel stops running, and the carbon sleeve rolls run for 30 minutes to produce normally, and no nodules appear in 48 hours of normal production.

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Abstract

The invention discloses a method for controlling and treating bottom roller dross of a carbon sleeve furnace. The possibility of dross occurrence is reduced by effective preventive measures for controlling the brushing current of a brush roller, reducing the use of a severely-oxidized transition strip, controlling appropriate furnace pressure, dew point and hydrogen content according to the difference of process speeds and process temperatures, periodically adjusting the rotating speed of a furnace roller, reducing running speed difference between the furnace roller and band steel, controlling the temperature raising and lowering rates of process temperature transformation during steel transformation and the like. Simultaneously, different treatment methods are used according to different dross states, so that treatment time is shortened greatly. The problems of long treatment time, single treatment method, no distinguished treatment according to different dross states, grinding of all furnace bottom rollers during treatment, damage to the furnace bottom rollers without dross, effect on service life and the like are solved, the plate surface quality of a cold-rolled and annealed product is enhanced and product percent of pass is increased.

Description

technical field [0001] The invention relates to a control method for avoiding nodules on carbon-sheathed hearth rolls of a continuous annealing furnace, and a method for rapidly processing the noduled carbon-sheathed hearth rolls. Background technique [0002] Silicon steel continuous annealing furnaces generally use horizontal annealing furnaces. At present, most silicon steel sheet manufacturers use graphite carbon sleeves as the bottom rollers of continuous annealing furnaces. Long-term use of the carbon sleeve in the high-temperature environment of the continuous annealing furnace is prone to "nodules", which will cause defects such as bright marks, scratches, and chrome damage on the strip steel. [0003] Due to the long-term use of graphite carbon sleeves in high-temperature environments in continuous annealing furnaces, some additives overflow in high-temperature environments and produce micropores on the surface of carbon sleeves. Under the environment of tension an...

Claims

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Application Information

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IPC IPC(8): C21D11/00C21D1/26C21D9/56C23G1/19
Inventor 赵健金文旭姜雨罗理石良李元华张本尊
Owner ANGANG STEEL CO LTD
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