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0.4 mm thin IF steel strip continuous annealing anti-wrinkling control method

A control method and continuous retreating technology, applied in heat treatment process control, manufacturing tools, furnaces, etc., can solve problems such as broken belt accidents and great influence on unit stable operation

Active Publication Date: 2019-01-15
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when producing thin-strip IF steel, it is necessary not only to make the temperature of the strip steel meet the requirements and meet its performance, but also to ensure the stable operation of the unit and the safety of the strip steel. There will be wrinkles, and it is very easy to cause a broken belt accident, which has a great impact on the stable operation of the unit

Method used

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  • 0.4 mm thin IF steel strip continuous annealing anti-wrinkling control method
  • 0.4 mm thin IF steel strip continuous annealing anti-wrinkling control method
  • 0.4 mm thin IF steel strip continuous annealing anti-wrinkling control method

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Experimental program
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Effect test

Embodiment 1

[0047] Production variety: DC04, specification: 0.4*1024mm, the tension process in the furnace is shown in Table 2.

[0048] The process parameter base of each section tension in the furnace in table 2 embodiment 1

[0049]

[0050] Turn off the first pair of fans in the slow cooling section and the second pair of fans in the fast cooling section, turn off all the electric heaters in the aging section, and adjust the unit speed to 200m / min. After the above adjustments, the surface of the strip steel is smooth and there is no cold wrinkle.

Embodiment 2

[0052] Production variety: DC04, specification: 0.4*1320mm, the tension process in the furnace is shown in Table 3.

[0053] The process parameter base of each section tension in the furnace in table 3 embodiment 2

[0054]

[0055] Due to the roll change failure of the export tempering machine, the export was full, and the furnace area slowed down to shutdown.

[0056] When the unit slows down, switch the heating mode to the Standby mode in advance, that is, the standby mode. The Standby temperature heating section 1-13 zone is 450°C, 14 zone is 500°C, and the slow cooling section and the fast cooling section are both 300°C; The cooling fans in the slow cooling section, fast cooling section and final cooling section are all turned off, and the tension of each section in the furnace is reduced by 20%. At this time, the strip steel in the furnace has no wrinkles or deviations; Tension, when the temperature in the furnace area is lowered to below 550°C in Standby mode, start...

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Abstract

The invention discloses a 0.4 mm thin IF steel strip continuous annealing anti-wrinkling control method, including steps of: a) during normal operation of a steel strip annealing production unit, shutting off cooling fans of at least one group of slow cooling sections and quick cooling sections, and shutting off electric heaters in all aging sections; b) during emergency speed down of the steel strip annealing production unit, switching heating mode into standby mode; c) when the steel strip annealing production unit is shutdown in failure, reducing the temperature of all zones in the furnaceto lower than 550 DEG C and increasing technical speed to 75-85 m / min with maintenance, then heating the temperature of the internal zone of the furnace to 700 DEG C, and increasing the technical speed to 95-105 m / min with maintenance, and when the temperature of the internal zone of the furnace reaches technical design requirement, returning to normal production. By means of the method, cold-wrinkling during production of the 0.4 mm thin IF steel strip is prevented, and accident of breaking of the steel strip is avoided. The method guarantees normal and stable production of the unit and reaches the object of reducing cost and increasing efficiency in enterprises.

Description

technical field [0001] The invention relates to the field of strip steel processing methods, in particular to a 0.4mm thin strip IF steel continuous retreat anti-wrinkle control method. Background technique [0002] Continuous annealing is the core part of the continuous annealing process, and the annealing furnace is the core part of completing this process. [0003] In the prior art, the DREVER continuous annealing furnace is generally used, and its main function is to heat the strip steel to the recrystallization temperature under the protection of HNx protective gas, and keep it at this temperature for a period of time to cause the strip steel to recrystallize. And through slow cooling, rapid cooling, overaging and final cooling, the strip steel can achieve the organization and structure we want, so as to meet the requirements of our practical application. [0004] However, when producing thin-strip IF steel, it is necessary not only to make the temperature of the strip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/56C21D1/26C21D11/00
CPCC21D1/26C21D9/561C21D11/00
Inventor 张彩明
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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