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Method for controlling deviation of wide materials of continuous annealing unit

A continuous annealing unit and wide material technology, which is applied in the field of steel rolling heat treatment, can solve the problems that cannot be eliminated, scratches on the unit frame and furnace wall, material strip inlet loops, deviation in the furnace, etc.

Inactive Publication Date: 2020-10-30
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] During the production of wide slabs with a width of 1600mm and above, there have always been scratches on the surface of the strip, which cannot be eliminated. The material strip inlet loops and deviations in the furnace are serious, frequently scratching the frame of the unit and the furnace wall, causing shutdowns many times And broken belt accidents in the furnace, affecting the surface quality of the product, resulting in downgraded products

Method used

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  • Method for controlling deviation of wide materials of continuous annealing unit
  • Method for controlling deviation of wide materials of continuous annealing unit

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Effect test

Embodiment

[0015] Factors affecting strip deviation such as figure 1 As shown, for "strip deviation in continuous stripping" from human (operation), machine (measurement and wear of furnace roll surface roughness), material (rolling mill incoming material plate shape and "hot rolling raw material convexity, wedge shape exceeding standard"), Carry out cause analysis and comparison of existing measures in terms of method ("Deviation Control Plan"), ring and measurement (CPC detection accuracy), find out the real reason affecting the "strip deviation" of the 2130 continuous retreat unit in the current stage, and take corresponding measures Give a solution.

[0016] Bad influence of plate shape: H99030120, DC04, 1.6mm×1500mm, produced by the continuous retreating unit at 18:51:28 on September 14, 2019, the strip steel deviated 215mm from the entrance looper to the OS side and scratched the "looper frame", and the team stopped Cut off the deviation and scratched part. According to the video...

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Abstract

The invention belongs to the technical field of steel rolling heat treatment, and particularly relates to a method for controlling deviation of wide materials of a continuous annealing unit. The method comprises the following steps of 1) controlling the plate shape of an incoming material of a rolling mill; 2) controlling a convexity value and a wedge-shaped value of a hot-rolled strip steel; andconducting closed discharge or repairing and cutting off on a steel coil with the convexity value less than 40 micrometers or the convexity value larger than 80 micrometers and the wedge-shaped valuelarger than 50 micrometers; 3) cutting off a seriously defective part of the strip shape in the head and tail areas of the steel coil, and sealing the steel coil with a poor strip shape of the whole coil; and 4) controlling the deviation of a strip steel furnace area, specifically, when the temperature of the furnace area is reduced to 700 DEG C or below, controlling a strip steel speed at a deviation position to enable the strip steel to crawl out of the furnace at the speed of V less than or equal to 30m / min, and increasing the speed of the furnace area only after the deviation amount of thestrip steel is less than or equal to 50mm. According to the method, the strip steel deviation risk is reduced, and the strip breakage accident in the furnace is avoided.

Description

technical field [0001] The invention belongs to the technical field of steel rolling heat treatment, and in particular relates to a method for controlling deviation of wide material in a continuous annealing unit. Background technique [0002] The maximum process speed of the continuous annealing unit can reach 450mpm, so the stable and high-speed operation of the continuous annealing unit in the production process has become a prerequisite for ensuring high and stable production of the continuous annealing unit. [0003] During the production of wide slabs with a width of 1600mm and above, there have always been scratches on the surface of the strip, which cannot be eliminated. The material strip inlet loops and deviations in the furnace are serious, frequently scratching the frame of the unit and the furnace wall, causing shutdowns many times And broken belt accidents in the furnace will affect the surface quality of the product and cause downgraded products. Contents of...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/26
CPCC21D1/26C21D9/52
Inventor 王利国解志彪洪天生刘祥龙曲嘉宝阮国庆程欣
Owner ANGANG STEEL CO LTD
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