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Method and device for removing steel strip oxidation tint

A technology to eliminate banding and oxidation color, applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve problems such as product grade reduction and quality degradation

Active Publication Date: 2017-05-10
BEIJING SHOUGANG COLD ROLLED SHEET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a method and device for eliminating the oxidation color of strip steel, which is used to solve the problem that the oxidation color appears on the surface of the strip steel during the production process of the strip steel, which leads to quality degradation and the product grade is degraded. Reduced technical issues

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  • Method and device for removing steel strip oxidation tint

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Embodiment 1

[0029] Present embodiment provides a kind of method for eliminating strip steel oxidation color, as figure 1 As shown, the method mainly includes the following steps:

[0030] Step 110, producing the steel strip within a preset production period.

[0031] In this step, due to the long-time shutdown and re-starting of the furnace (continuous annealing furnace), oxidized color is likely to appear on the edge of the strip, and after the start-up, oxidized color appears on the entire surface of the strip in contact with the furnace roll. Therefore, in the process of producing steel strips, the steel strips need to be produced within a preset production period. Wherein, the preset period is 24-48 hours after starting the production line (starting up). Preferably, it is 24h, 25h or 30h.

[0032] The strip steel may be high-strength steel, specifically including: high-strength steel with a tensile strength of 340MPa, 490MPa, 590MPa, 790MPa and 980MPa.

[0033] Here, the continuou...

Embodiment 2

[0043] Corresponding to Embodiment 1, this embodiment also provides a device for eliminating the oxidation color of strip steel, such as figure 2 As shown, the device includes: a first control unit 21, a second control unit 22, and a third control unit 23; wherein,

[0044] First of all, due to the long-time shutdown and restart of the furnace (continuous annealing furnace), oxidation color is easy to appear on the edge of the strip. After starting the machine, oxidation color appears on the entire surface of the strip in contact with the furnace roller. Therefore, in the process of producing steel strips, the steel strips need to be produced within a preset production period. Wherein, the preset period is 24-48 hours after starting the production line (starting up). Preferably, it is 24h, 25h or 30h. The strip steel may be high-strength steel, specifically including: high-strength steel with a tensile strength of 340MPa, 490MPa, 590MPa, 790MPa and 980MPa.

[0045] Here, t...

Embodiment 3

[0053] In practical application, when the strip steel tensile strength is respectively 340MPa, 590MPa, 980MPa, utilize the method that embodiment 1 provides and the device that embodiment 2 provides to produce described strip steel, concrete process is as follows:

[0054] First of all, due to the long-term shutdown and restarting of the furnace (continuous annealing furnace), oxidation color is likely to appear on the edge of the strip steel. After the start-up, oxidation color appears on the entire surface of the strip steel in contact with the furnace roller. Therefore, in the process of producing steel strips, the steel strips need to be produced within a preset production period. Wherein, the preset period is 24-48 hours after starting the production line (starting up). In this embodiment, it is 26h.

[0055] Here, the continuous annealing furnace is a vertical continuous annealing furnace, including: a preheating section, a heating section, a soaking section, a slow coo...

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Abstract

The invention provides a method and device for removing steel strip oxidation tint. The method comprises the steps of producing the steel strip in a preset production period; controlling heating temperature of 770-800 DEG C, slow cooling temperature of 630-680 DEG C, fast cooling temperature of 250-310 DEG C, and over-aging temperature of 240-300 DEG C in the production process; controlling the steel strip speed of less than 200 / min at a furnace area, with the deviation of + / -10m / min; controlling leakage temperature of -55 - -45 DEG C in the furnace; in this way, if the steel strip to be produced is high-strength steel, producing the high-strength steel 24-48h after starting the steel strip production line so as to effectively avoid the oxidation tint of the contact part between the steel strip and furnace rollers; controlling the steel strip running speed at the furnace area and the fast cooling temperature of <=320 DEG C in the production process, and preventing atmosphere in the furnace from being oxidized through controlling the leakage temperature in the furnace, so that the problem of the oxidation tint occurred on the surface of the steel strip is solved basically, and the quality and grade of the steel strip are improved so as to avoid economic loss.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a method and a device for eliminating oxidation color of strip steel. Background technique [0002] In recent years, with the gradual improvement of users' requirements for the surface quality of cold-rolled products, the oxidation color defect on the surface of continuous annealing high-strength steel (yellow, blue or black on the surface when the strip is off-line) has become a typical surface defect. , Seriously affect the user's coating and further processing, it is difficult to meet the requirements of high-end cold-rolled sheets. [0003] Oxidation color of high-strength steel not only affects the surface quality of strip steel and lowers the product grade, but also causes great losses to the economic benefits of steel companies, and seriously affects the normal production rhythm. [0004] Based on this, there is an urgent need for a method for eliminat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/52C21D11/00
CPCC21D1/26C21D1/74C21D9/52C21D11/00
Inventor 程晓杰李振柳智博曾卫仔孙建华赵宁陈甚超任君茹
Owner BEIJING SHOUGANG COLD ROLLED SHEET
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