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Method for improving thickness hit rate of high-alloy steel plate

A hit rate, steel plate technology, applied in the direction of metal rolling, metal rolling, metal processing equipment, etc., can solve the thin thickness of the steel plate head and tail thickness, secondary model calculation roll gap deviation, uneven distribution of head and tail deformation resistance and other problems to achieve the effect of improving the rolling thickness hit rate and solving difficult problems

Active Publication Date: 2021-11-19
NANJING IRON & STEEL CO LTD
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  • Application Information

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Problems solved by technology

[0002] During the rolling process of high-alloy steel for medium and heavy plates, due to the influence of heat conduction, radiation, convection, and water cooling, the temperature at the head and tail of the steel plate is lower than that in the middle, and the factors of uneven distribution of deformation resistance at the head and tail cause the secondary model to calculate the roll There is a certain deviation in the gap, and the absolute AGC roll gap control has an inherent response speed, and the thickness of the head and tail of the steel plate is too small

Method used

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Experimental program
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Effect test

Embodiment Construction

[0019] A method for improving the hit rate of high-alloy steel plate thickness provided in this embodiment includes:

[0020] 1. Optimize the roll gap compensation and bounce compensation of the steel bite during the rolling process, and reduce the thickness difference between the head and tail of the steel plate

[0021] Increase the roll gap compensation by 0.20mm from the establishment of the nip steel rolling process of 1 meter;

[0022] In the process of biting steel and rolling 1 meter, the rolling mill bounce coefficient of the roll gap calculation model is reduced by 5%, that is, from 100% to 95%.

[0023] 2. Use target thickness compensation to reduce heat treatment thickness loss

[0024] After the heat treatment of the steel plate, the thickness loss rate is 6‰~8‰. According to different steel types and different order thickness ranges, combined with actual experience values, the corresponding rolling target thickness setting is determined to compensate for the thi...

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Abstract

The invention discloses a method for improving the thickness hit rate of a high-alloy steel plate, and relates to the technical field of steel production. The method comprises the following steps: 1, optimizing roll gap compensation and bounce compensation of steel biting in a rolling process, and reducing the thickness difference of the head and the tail of the same steel plate; and 2, adopting target thickness compensation to reduce heat treatment thickness loss. Aiming at the problems of thickness difference of the same plate in the rolling process of the high-alloy steel plate and thickness change after off-line heat treatment, control over the thickness difference of the same plate and thickness compensation of heat treatment in the rolling process are realized, optimization and adjustment are mainly carried out from rolling steel biting roll gap compensation, steel biting bounce compensation and rolling target thickness setting, the problems are effectively solved, and the rolling thickness hit rate is greatly increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for improving the hit ratio of high-alloy steel plate thickness. Background technique [0002] During the rolling process of high-alloy steel for medium and heavy plates, due to the influence of heat conduction, radiation, convection, and water cooling, the temperature at the head and tail of the steel plate is lower than that in the middle, and the factors of uneven distribution of deformation resistance at the head and tail cause the secondary model to calculate the roll There is a certain deviation in the gap, and the absolute AGC roll gap control has an inherent response speed, and the thickness of the head and tail of the steel plate is too small. In addition, the thickness of the high-alloy steel plate of the medium-thick plate becomes thinner after the microstructure transformation of the heat treatment and the surface shot blasting. Therefore, ...

Claims

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Application Information

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IPC IPC(8): B21B37/16
CPCB21B37/16
Inventor 黄龙孙旭东陈维宇王玉姝蒋旭
Owner NANJING IRON & STEEL CO LTD