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Method for improving annealing uniformity of bell-type furnace

A bell-type furnace and uniformity technology, applied in the direction of furnace, furnace type, heat treatment furnace, etc., can solve the problems of annealing color difference, uneven temperature and uneven performance on the surface of stainless steel hot-rolled coil, and achieve the color difference and rolling of stainless steel hot-rolled coil. The effect of improving the thickness fluctuation after rolling, improving the uniformity, improving the color difference and the thickness fluctuation after rolling

Pending Publication Date: 2022-05-24
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the bell furnace structure itself, the temperature at different positions in the bell furnace is not uniform during the annealing process, which eventually leads to a series of problems such as annealing color difference, uneven performance, and uneven thickness of the strip after rolling on the surface of the stainless steel hot-rolled coil. In severe cases, the whole coil of stainless steel hot-rolled coil will be scrapped
Seriously affect the benefits of the company and the use of customers

Method used

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  • Method for improving annealing uniformity of bell-type furnace
  • Method for improving annealing uniformity of bell-type furnace
  • Method for improving annealing uniformity of bell-type furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] 1. Choose a bell-type furnace with a fan frequency of 65Hz for annealing, and discard the bell-type furnace below 40HZ.

[0019] 2. The hydrogen flow rate of 2h before heating is increased from 9m 3 / h adjusted to 13m 3 / h; the hydrogen flow rate 1h before the end of the insulation is increased from 15m 3 / h adjusted to 23m 3 / h. The color difference of the selected bell furnace number before and after adjustment is out of proportion and the customer complaints are as follows

[0020]

[0021] 3. The 19# and 20# furnaces were added to simulate the failure for 1h, and the time was added by 1.5 times (1.5h).

[0022]

[0023]

[0024] 5, 17, 18# furnace table is adjusted from 225 ℃ to 245 ℃ according to the furnace temperature, the color difference of the selected bell furnace number before and after adjustment is out of proportion (100% by weight) and customer complaints are as follows

[0025]

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Abstract

The invention relates to the field of metallurgical stainless steel production, in particular to a method for improving annealing uniformity of a bell-type furnace, which is characterized by comprising the following steps of: 1, selecting a furnace condition; 2, adjusting the hydrogen flow; 3, process time-complementing correction is carried out under the fault condition; and fourthly, the tapping temperature is adjusted. By adjusting various annealing parameters (hydrogen flow, fan frequency and the like) of the bell-type furnace and a production system under the fault condition, the uniformity of temperatures at different positions in the furnace during annealing of the bell-type furnace is improved, and the color difference of a stainless steel hot-rolled coil and the thickness fluctuation after rolling are improved. After the process is modified, the color difference of the stainless steel hot-rolled coil and the thickness fluctuation after rolling are obviously improved. Through the implementation of the process, the color difference rate of hot rolling of the 430 stainless steel commodity is reduced from 3.2% to 1.95; and the complaint of a user in the thickness aspect after rolling is obviously reduced.

Description

technical field [0001] The invention relates to the field of metallurgical stainless steel production, in particular to a method for improving the annealing uniformity of a bell furnace. Background technique [0002] At present, the full hydrogen bell furnace is widely used for hot rolling and annealing of stainless steel. Due to the limitation of the structure of the bell-type furnace, the temperature at different positions in the bell-type furnace during the annealing process is not uniform, which eventually leads to a series of problems such as annealing color difference, uneven performance, and uneven thickness of the strip after rolling on the surface of the stainless steel hot-rolled coil. Seriously, the whole coil of stainless steel hot-rolled coil will be scrapped. Seriously affect the company's efficiency and the use of customers. By adjusting various annealing parameters of the bell furnace (hydrogen flow rate and fan frequency, etc.) and the production system un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/52
CPCC21D1/26C21D1/74C21D9/52
Inventor 赵子钧白晋钢杨永超杨东
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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