Method or accurately controlling slab in-furnace time of stepping heating furnace

A step-by-step heating furnace, precise control technology, applied in the direction of heat treatment process control, heat treatment furnace, furnace, etc., can solve the problems of great difference in time of slab furnace, affecting quality, etc., to ensure the rhythm of steel passing and the quality of heating. , Precisely control the effect of furnace time

Inactive Publication Date: 2020-04-10
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It can be seen that the slab gap in the traditional mode is a fixed value, which causes a great difference in the time of different widths of the slab furnace, which affects the final quality.
In order to ensure the heating quality of the slab, avoid temperature under-burning, and at the same time ensure the rhythm of steel passing and the lowest oxidation loss, the existing control method needs to be improved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0019] Specific embodiment 1, three furnaces produce pipeline steel, the number of steel blocks per hour for pipeline steel is 30 pieces per hour, the length of the heating furnace is 54850 mm, and the width of the slab is 1500 mm. The time required for the slab to be in the furnace is not less than 200 Minutes, in order to ensure the time in the furnace, and can also reach the maximum production rhythm, the precise control of the time in the furnace is 210 minutes, which is 3.5 hours, and is solved as follows by the method of the present invention:

[0020] S1 Determine the thickness, steel type and width of the slab according to the production requirements, the width is 1500 mm, and according to the Taitz formula and empirical formula, consider the slab thickness, steel type and width to determine the furnace time as 3.5 hours;

[0021] The length of the S2 heating furnace is 54850 mm, and the number of steel blocks per hour is 30 blocks per hour.

[0022] The number of stee...

specific Embodiment 2

[0026] Specific embodiment 2, three furnaces produce hot charging temperature ≥ 550 ℃ hot charging slab, the steel type is the steel type that does not have the time requirement in the furnace, the slab section is a 1500 mm narrow section slab, and the slab entering furnace temperature is high, 900 -1000℃ slab oxidation begins to increase sharply. In order to reduce oxidation burning loss, it is required to control the furnace time at 165 minutes as the best, and the hour-over-steel rhythm is 32 pieces / hour.

[0027] S1 Determine the slab thickness, steel type and width according to the production requirements, the width is 1500 mm, and according to the Taitz formula and empirical formula, consider the slab thickness, steel type and width to determine the furnace time as 165 minutes, 2.75 hours;

[0028] The length of S2 heating furnace is 54850 mm, and the number of steel blocks per hour is 32 per hour.

[0029] The number of steel blocks loaded in a single furnace of S3 is 2...

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Abstract

The invention discloses a method for accurately controlling slab in-furnace time of a stepping heating furnace, and belongs to the technical field of metallurgical steel rolling heating furnace process control. According to the technical scheme, the method comprises the steps of determining slab thickness, steel grade and width according to production requirements, and determining in-furnace timeby comprehensively considering the slab thickness, steel grade and width according to a combination of a Tyzs formula and an empirical formula; determining the furnace length of the heating furnace and the tapping number of steel blocks per hour, calculating the loading number of steel blocks in a single furnace to obtain the distance between slabs, and writing the distance between the slabs intoa control system of the steel-making furnace, thereby accurately adjusting the gap between the slabs, realizing the purpose of accurately controlling the in-furnace time of the slabs, ensuring the heating quality of the slabs finally, avoiding the temperature under-burning, and also ensuring the steel passing rhythm and the lowest oxidation burning loss.

Description

technical field [0001] The invention relates to a method for controlling the furnace time of a walking heating furnace slab, and belongs to the technical field of metallurgical rolling heating furnace process control. Background technique [0002] The steel rolling heating furnace is a key process that affects the surface quality, product performance and yield of hot-rolled products. The slab residence time in the heating furnace is a major process parameter that affects product quality, performance, and yield. [0003] At present, the gap between the slabs in the walking heating furnace of the hot rolling mill is given a fixed value of 50mm. When the steel passing rhythm of the rolling mill is fixed, the time of the slab in the furnace varies with the width of the slab. In actual production, the rolling plan slab width specification span is large, generally between 900mm-2130mm, and the slab width is different, which determines the number of steel slabs in a single furnace ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/70C21D11/00
CPCC21D9/70C21D11/00
Inventor 潘竟忠蔡守丹李会朝王云周军锋李爱国李安州
Owner HANDAN IRON & STEEL GROUP
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