On-line roll grinding method for carbon jacket hearth roll

A hearth roll and carbon sleeve technology, applied in the field of steel rolling, can solve the problems of energy medium waste and unit operation rate reduction, and achieve the effects of improving the pass rate, reducing production costs and energy consumption, and extending the replacement cycle

Active Publication Date: 2012-11-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this method, it takes about 10 hours to process once, resulting in a signifi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1:

[0014] The steel grade is oriented silicon steel, and a horizontal continuous annealing furnace is used. The nodules on the surface of the steel plate are densely printed, and there are no acute-angled protrusions in the pits, which can be judged as nodules in the heating section of the 2# radiant tube, and there are a large number of small nodules on the carbon jacket furnace bottom roll of the intermediate annealing unit, and there are 5 heating sections. The set process temperatures are: 680°C, 650°C, 650°C, 650°C, and 650°C, respectively.

[0015] Select a transition roll with a thickness of 0.35mm that has been used twice. After removing the tension in the furnace, run the furnace roll for 2.5 minutes, and then increase the speed according to the process section gradient of 10 meters per time, running for 5 minutes each time, and adjust the furnace temperature according to the process setting temperature. Normal production can guarantee no nodules wit...

Example Embodiment

[0016] Example 2:

[0017] The steel grade is oriented silicon steel, and a horizontal continuous annealing furnace is used. The nodules and prints on the steel plate surface are sparse, and the pits have obvious sharp-angle protrusions. It is judged as nodules in the heating section of the 1# radiant tube. In the case of a small number of large nodules on the carbon jacket furnace bottom roll of the intermediate annealing unit, 5 heating The set process temperatures of the sections are: 800°C, 780°C, 760°C, 760°C, and 700°C, respectively.

[0018] A transition roll with a thickness of 0.65mm was used for 4 times, and the furnace roll was operated for 4 minutes after removing the tension in the furnace. Then set the speed of the process section to 25 m / min to crawl, run for 8 minutes, and heat up each furnace section to the set process temperature and control the furnace temperature for production.

[0019] Repeat the above process three times to achieve no nodulation for 30...

Example Embodiment

[0020] Example 3:

[0021] The steel grade is oriented silicon steel, and a horizontal continuous annealing furnace is used. The nodules and prints on the surface of the steel plate are sparse, and there are no obvious acute-angled protrusions in the pits. It is judged to be nodules in the 1# electric heating section, and there are a large number of small nodules on the carbon jacket hearth roll of the intermediate annealing unit. The set process temperatures are: 950°C, 940°C, 930°C, 930°C, and 930°C, respectively.

[0022] Select a transition roll with a thickness of 0.5mm that has been used for 4 times. After removing the tension in the furnace, run the furnace roll for 1 min, and then speed up the process step by 10 m / time, running for 8 min each time, and adjust the furnace temperature according to the process setting temperature. Normal production can guarantee no nodules within 16 hours.

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PUM

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Abstract

The invention provides an on-line roll grinding method for a carbon jacket hearth roll. According to the invention, for great accretion, temperature of each furnace segment is set to be 20 to 25 DEG C higher than normal temperature, a transitional coil which has been used less than 4 times and has a thickness of 0.5 to 0.7 mm is put in a furnace, tension in the furnace is eliminated, the roll is allowed to revolve for 8 to 12 min in a manner of combined inching after revolution for 4 to 5 min, then heating is carried out so as to control furnace temperature, and the above mentioned procedures are repeated for 3 cycles; for fine accretion, temperature of each furnace segment is set to be 10 to 15 DEG C higher than normal temperature, a transitional coil which has been used less than 4 times and has a thickness of 0.35 to 0.5 mm is put in a furnace, tension in the furnace is eliminated, and the roll is allowed to revolve for 1 to 3 min. According to the invention, accretion in the carbon jacket hearth roll can be rapidly removed; for the fine accretion, it is guaranteed that no accretion occurs any longer within 16 h after removal of the fine accretion; for the great accretion, it is guaranteed that no accretion occurs any longer within 30 h after removal of the great accretion; and therefore, an operating rate of a unit and rolling yield of products are greatly improved, and production cost and energy consumption are reduced.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a method for rapidly processing oriented silicon steel with a carbon sleeve hearth roll nodule on-line grinding roll treatment method for a continuous annealing furnace. Background technique [0002] The continuous annealing furnace for intermediate annealing of oriented silicon steel generally uses a horizontal annealing furnace. The continuous annealing furnace is divided into 7 sections. The set temperature of 5 heating sections is 930 ° C, and the remaining 2 sections are cooling sections. At present, most silicon steel sheet manufacturers use graphite carbon sleeve rolls as the hearth rolls of continuous annealing furnaces. The carbon sleeve hearth rolls are prone to "nodules" after long-term use in the high-temperature environment of the continuous annealing furnace, which will cause defects such as bright marks, scratches and bruises on the str...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/26
Inventor 赵健金文旭姜雨石良李元华罗振宇王祥辉
Owner ANGANG STEEL CO LTD
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