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Method for accurately realizing symmetric shielding of strip steel edge parts

A strip steel edge and edge technology, applied in the direction of temperature control, etc., can solve the problems of not being able to change the shielded width at any time, the shielding width of both sides is asymmetrical, and not meeting the requirements of precise control, etc., to achieve Improve the uniformity of transverse performance, improve the quality of visible plate shape, and control the effect of plate shape variation

Active Publication Date: 2020-03-06
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early stage of production in the hot rolling mill, the operator manually opens and closes the device according to the steel type and width on the HMI screen at the first level. There are many limitations, namely: 1. Frequently change the requirements of the side shielding operation state; ②For strip steel with different steel types, thicknesses, and widths, the requirements for changing the shielded width at any time cannot be met; ③When rolling steels that are sensitive to temperature or performance The precise control requirements cannot be met for steel types with relatively high requirements; ④ When the alignment of the strip steel is poor, the shielding width of the two sides will be asymmetrical, resulting in serious side bending and other defects

Method used

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  • Method for accurately realizing symmetric shielding of strip steel edge parts
  • Method for accurately realizing symmetric shielding of strip steel edge parts
  • Method for accurately realizing symmetric shielding of strip steel edge parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] High-grade pipeline steel with high alloy content is selected to obtain relatively pure molten steel through smelting, and then cast into slabs through continuous casting machines.

[0057] Heat the slab to 1196°C, stay in the heat preservation section for 35 minutes, and perform temperature compensation at the tail, then turn on all the high-pressure water for descaling, the pressure is 203 Bar, and the descaling temperature is 1180°C; the slab after descaling is subjected to 3+5 times of roughing Rolling, the reduction rate of the last pass of rough rolling is 5% higher than the automatic setting, the starting temperature of rough rolling is 1132°C, the temperature of finishing rolling of rough rolling is 1015°C, the water pressure of the second descaling is 209Bar; the vertical roll of rough rolling is normal Passes 1, 2 and 1, 3, and 5 were put into use, and the seal of the vertical roll baffle was normal without water leakage; after exiting the rough rolling mill, t...

Embodiment 2

[0061] High-grade pipeline steel with high alloy content is selected to obtain relatively pure molten steel through smelting, and then cast into slabs through continuous casting machines.

[0062] Heat the slab to 1191°C, stay in the heat preservation section for 38 minutes, and perform temperature compensation at the tail, then turn on all the descaling high-pressure water, the pressure is 197 Bar, and the descaling temperature is 1170°C; the slab after descaling is subjected to 3+5 times of rough Rolling, the reduction rate of the last pass of rough rolling is 5% higher than the automatic setting, the starting temperature of rough rolling is 1130°C, the temperature of finishing rolling of rough rolling is 990°C, the water pressure of the second descaling is 201Bar; the vertical roll of rough rolling is normal Passes 1, 2 and 1, 3, and 5 were put into use, and the seal of the vertical roll baffle was normal without water leakage; after exiting the rough rolling mill, the insul...

Embodiment 3

[0066] High-grade pipeline steel with high alloy content is selected to obtain relatively pure molten steel through smelting, and then cast into slabs through continuous casting machines.

[0067] Heat the billet to 1186°C, stay in the heat preservation section for 33 minutes, carry out temperature compensation at the tail, then turn on all the descaling high-pressure water, the pressure is 199Bar, and the descaling temperature is 1173°C; the cast billet after descaling is subjected to 3+5 rough Rolling, the reduction rate of the last pass of rough rolling is 5% higher than the automatic setting, the starting temperature of rough rolling is 1133°C, the temperature of finishing rolling of rough rolling is 991°C, the water pressure of the second descaling is 203Bar; the vertical roll of rough rolling is normal Passes 1, 2 and 1, 3, and 5 were put into use, and the seal of the vertical roll baffle was normal without water leakage; after exiting the rough rolling mill, the insulati...

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Abstract

The invention relates to a method for accurately realizing symmetric shielding of strip steel edge parts, and belongs to the technical field of hot rolling equipment modification and hot rolling process control in the metallurgical industry. According to the technical scheme, edge shielding parameters corresponding to different varieties and specifications are preset in a model data table, deviation of an actual shielding width are further identified and fed back by detecting the transverse temperature distribution of strip steel, flexible control of the edge shielding width adjustment is achieved, edge shielding requirements of different varieties of strip steel are guaranteed, and then temperature control of different varieties of strip steel is ensured. According to the method, by adjusting a transverse position of an edge shielding mechanism, symmetrical side part shielding of misalignment strip steel is achieved; and coordination and control are realized through two methods, so that the quality problems of the performance, the plate type and the like due to the influence of the edge temperature gradient of hot rolled products with different varieties, different specificationsand different alignment degrees are reduced.

Description

technical field [0001] The invention relates to a method for accurately realizing the symmetrical shielding of the edge of strip steel, and belongs to the technical field of hot-rolling equipment transformation and hot-rolling process control in the metallurgical industry. Background technique [0002] During the laminar cooling process of the strip steel, due to the different cooling conditions of each part, there will be different degrees of temperature inhomogeneity in the width direction, thickness direction and length direction of the strip steel, which will eventually lead to uneven microstructure and properties in each direction. In the width direction of the strip, the cooling of the edge of the strip and the middle of the strip during the post-rolling cooling process is not uniform in the width direction of the strip. The main reasons are as follows: [0003] ① During the rolling process, the heat transfer conditions at the edge of the steel plate are better than th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74
CPCB21B37/74
Inventor 年保国刘需郝学斌谷辉格李爱民任连波李增军
Owner HEBEI IRON AND STEEL
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