Method for controlling edge cracking of strip steel through crystallization roller shape

A technology for controlling strips and crystal rolls, applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc.

Active Publication Date: 2021-02-02
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of the present invention improves the balance of the thickness reduction ratio in the width direction of the strip steel by controlling the thickness of the edge of the cast strip and the difference between the thickness redu

Method used

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  • Method for controlling edge cracking of strip steel through crystallization roller shape
  • Method for controlling edge cracking of strip steel through crystallization roller shape
  • Method for controlling edge cracking of strip steel through crystallization roller shape

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In embodiment 1, it is determined that the length of the strip edge crack along the width direction of the strip is 50 mm, and the length of the roll profile of the crystallization roll side that needs to be modified is determined to be 90 mm; 1 point is taken at a distance of every 10 mm, and the original crystallization roll The edge roll shape curve is discretized and taken within the range of 90mm edge length to obtain the discretized original roll shape value S 0 , S 1 , S 2 ... S 9 ; At the same time obtain the edge thickness value H of the cast strip within the same length range 0 、H 1 、H 2 ......H 9 and strip thickness value h 0 、h 1 、h 2 ... h 9 ; Obtain the thickness of the cast strip at the central position of the strip width and the thickness of the rolled strip to be 1.758mm and 0.9mm, and calculate the thickness reduction ratio at the central position to be 48.8%; R i value and s i The value of is shown in Table 1, and according to the original ...

Embodiment 2

[0035] In embodiment 2, it is determined that the length of the strip edge crack along the width direction of the strip is 35mm, and the length of the roll profile of the crystallization roll that needs to be modified is determined to be 70mm; get 1 point at a distance of every 7mm, and the original crystallization roll The edge roll shape curve is discretized and taken within the range of 70mm edge length to obtain the discretized original roll shape value S 0 , S 1 , S 2 ... S 10 ; At the same time obtain the edge thickness value H of the cast strip within the same length range 0 、H 1 、H 2 ......H 10 and strip thickness value h 0 、h 1 、h 2 ... h 10 ; Obtain the thickness of the cast strip at the central position of the strip width and the thickness of the rolled strip to be 1.8mm and 1.2mm, and calculate the thickness reduction ratio at the central position to be 33.3%; R i value and s i The value of is shown in Table 1, and according to the original roll shape an...

Embodiment 3

[0040]In embodiment 3, it is determined that the length of the strip edge crack along the width direction of the strip is 15mm, and the length of the roll shape of the crystallization roll side that needs to be modified is determined to be 20mm; 1 point is taken at a distance of every 5mm, and the original crystallization roll The edge roll shape curve is discretized and taken within the range of 20mm edge length to obtain the discretized original roll shape value S 0 , S 1 , S 2 ... S 4 ; At the same time obtain the edge thickness value H of the cast strip within the same length range 0 、H 1 、H 2 ......H 4 and strip thickness value h 0 、h 1 、h 2 ... h 4 ; Obtain the thickness of the cast strip at the central position of the strip width and the thickness of the rolled strip to be 1.75mm and 0.8mm, and calculate the thickness reduction ratio at the central position to be 54.2%; R i value and s i The value of is shown in Table 1, and according to the original roll sha...

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Abstract

A method for controlling edge cracking of strip steel through a crystallization roller shape includes the steps that discretization point taking is performed on an edge roller shape curve, a cast strip thickness curve and a rolled strip thickness curve of an original crystallization roller, the thickness reduction ratio of the center position in the width direction of the strip steel is obtained through calculation, the thickness reduction ratio of the edge area of the strip steel is controlled, a corrected crystallization roller edge roller shape value is obtained according to the roller shape optimization variable and the like, and curve fitting is performed on the discretized roller shape value to obtain a new crystallization roller edge roller shape curve. According to the method, thethickness of the edge of a cast strip is controlled by changing the roller shape of the edge of the crystallization roller, the thickness reduction ratio of the strip steel in the width direction, especially in the central area and the edge area, in the hot rolling process is controlled, the rolling balance of the strip steel in the width direction in the hot rolling process is improved, the defect of edge cracks of the double-roller cast strip steel is overcome, the edge quality of the strip steel is improved, and the problems of strip breakage and poor production continuity caused by edge cracking defects are solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, relates to twin-roll thin strip continuous casting and steel rolling, and more specifically relates to a method for controlling edge cracking of strip steel through crystallized roll profiles. Background technique [0002] The twin-roll casting and rolling process is to cast molten steel through a pair of counter-rotating crystal rolls into a thin cast strip, the thickness of which is generally less than 4mm, and then roll the cast strip into a hot-rolled strip with a thickness of less than 3mm after hot rolling. For strip steel, the hot rolling reduction rate is generally below 70%. The production process of the twin-roll casting and rolling production line is short, with few production processes, and it is difficult to control the strip rolling. In the production process, it is difficult to solve the problem of edge crack defects. [0003] The edge quality control in the prior ...

Claims

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Application Information

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IPC IPC(8): B21B37/00
CPCB21B37/00
Inventor 陈爱华李化龙施一新周东升吴荣洲李婷婷
Owner SHAGANG GROUP
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