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A Method for Accurately Realizing the Symmetric Shielding of Steel Strip Edge

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 shaded width at any time, the asymmetry of the shaded width of the two sides, and the lack of precise control requirements, 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: 2022-06-07
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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  • A Method for Accurately Realizing the Symmetric Shielding of Steel Strip Edge
  • A Method for Accurately Realizing the Symmetric Shielding of Steel Strip Edge
  • A Method for Accurately Realizing the Symmetric Shielding of Steel Strip Edge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] High-grade pipeline steel with high alloy content is selected, and the purer molten steel is obtained through smelting, and then continuous casting is formed into a casting billet by continuous casting machine.

[0057] The casting blank is heated to 1196 °C, the insulation section stays for 35 min, the tail temperature compensation is carried out, and then the descaling high-pressure water is all opened, the pressure is 203Bar, and the descaling temperature is 1180 °C; After descaling, the casting blank is roughed 3+5 times, and the final pressure rate of roughing is increased by 5% compared with the automatic setting, the roughing opening temperature is 1132 °C, the rough rolling final rolling temperature is 1015 °C, and the secondary descaling water pressure is 209 Bar; The rough rolling vertical roller is normally put into use 1, 2 and 1, 3, 5 times, and the vertical roller water barrier is sealed normally and does not leak; After the roughing mill, the insulation cover...

Embodiment 2

[0061]High-grade pipeline steel with high alloy content is selected, and the purer molten steel is obtained through smelting, and then continuous casting is formed into a casting billet by continuous casting machine.

[0062] The casting blank is heated to 1191 °C, the insulation section stays for 38 min, the tail temperature compensation is carried out, and then the descaling high-pressure water is all opened, the pressure is 197 Bar, and the descaling temperature is 1170 °C; After descaling, the casting blank is roughed 3+5 times, and the last pressure rate of rough rolling is increased by 5% compared with the automatic setting, the rough rolling opening temperature is 1130 °C, the rough rolling final rolling temperature is 990 °C, and the secondary descaling water pressure is 201 Bar; The rough rolling vertical roller is normally put into use 1, 2 and 1, 3, 5 times, and the vertical roller water barrier is sealed normally and does not leak; After the roughing mill, the insulati...

Embodiment 3

[0066] High-grade pipeline steel with high alloy content is selected, and the purer molten steel is obtained through smelting, and then continuous casting is formed into a casting billet by continuous casting machine.

[0067]The casting blank is heated to 1186 °C, the insulation section stays for 33 min, the tail temperature is compensated, and then the descaling high-pressure water is all opened, the pressure is 199 Bar, and the descaling temperature is 1173 °C; After descaling, the casting blank is roughed 3+5 times, and the final pressure rate of roughing is increased by 5% compared with the automatic setting, the opening temperature of rough rolling is 1133 °C, the final rolling temperature of rough rolling is 991 °C, and the water pressure of secondary descaling is 203 Bar; The rough rolling vertical roller is normally put into use 1, 2 and 1, 3, 5 times, and the vertical roller water barrier is sealed normally and does not leak; After the roughing mill, the insulation cover...

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Abstract

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. The technical solution is: by pre-setting the edge shading parameters corresponding to different varieties and specifications in the model data table, and further detecting the lateral temperature distribution of the strip to identify the deviation of the actual shading width and feedback, to achieve flexible control of the edge shading width Adjust to ensure the edge shielding requirements of different types of strip steel, and then ensure the temperature control of different types of strip steel. The present invention also realizes the symmetrical edge shielding of misaligned strip steel by adjusting the lateral position of the edge shielding mechanism; through the coordinated control of the two methods, the hot-rolled products of different varieties, specifications and alignment degrees are reduced due to edge Performance, plate shape and other quality problems caused by the influence of temperature gradient.

Description

Technical field [0001] The present invention relates to a method of precisely realizing symmetrical shielding of strip edges, belonging to the field of hot rolling equipment modification and hot rolling process control technology in the metallurgical industry. Background [0002] In the laminar flow cooling process, due to the different cooling conditions of each part, the strip will lead to different degrees of temperature unevenness along the width direction, thickness direction and length direction, and eventually lead to unevenness of tissue and performance in each direction. In the direction of strip width, the strip edges and strip middle are not cooled uniformly in the strip width direction during the post-roll cooling process, mainly due to the following reasons: [0003] (1) In the rolling process, the heat exchange conditions of the edge of the steel plate are better than the intermediate part, and there is a large temperature gradient in the edge after the final rollin...

Claims

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Application Information

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Patent Type & Authority Patents(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