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Reducing atmosphere establishment method and continuous annealing process for continuous annealing process

A technology of annealing process and establishment method, which is applied in the field of continuous annealing process and the establishment of reducing atmosphere to eliminate the problem of dezincification or pinhole exposed steel on the plate surface, prevent thermal wrinkles, and reduce the rate of defective products.

Active Publication Date: 2018-07-10
华冠新型材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the shortcomings and deficiencies of the prior art, and provides a method for establishing a reducing atmosphere for a continuous annealing process, which can prevent the problem of dezincification on the plate surface or pinhole-like exposed steel caused by a poor reducing atmosphere, and improve Galvanized sheet, galvalume sheet and aluminum sheet quality, reduce energy consumption

Method used

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  • Reducing atmosphere establishment method and continuous annealing process for continuous annealing process
  • Reducing atmosphere establishment method and continuous annealing process for continuous annealing process
  • Reducing atmosphere establishment method and continuous annealing process for continuous annealing process

Examples

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Embodiment 1

[0029] see figure 1 , which is a flowchart for establishing a reducing atmosphere in Example 1 of the present invention. The method for establishing a reducing atmosphere for a continuous annealing process includes the following steps:

[0030] Step 111: Heating the furnace body; passing nitrogen gas into the furnace body from the soaking zone of the furnace body, so that the nitrogen gas flows to the fast cooling zone of the furnace body, the radiant tube heating zone, and the non-oxidizing heating zone in order to replace the oxygen in each zone, and Keep the oxygen content in each zone below 1000PPM.

[0031] In the present embodiment, the nitrogen flow rate that feeds is 360Nm 3 / h.

[0032] Step 112: Before starting the strip conveying production line, when the dew point temperature of the furnace body is ≤-35°C and the temperature of the non-oxidation heating zone is ≥650°C, feed hydrogen into the furnace body from the soaking zone of the furnace body so that the hydr...

Embodiment 2

[0037] see figure 2 , which is a flowchart of the continuous annealing process in Example 2 of the present invention. The continuous annealing process includes the following steps:

[0038] Step 21: Establish a reducing atmosphere in the non-oxidation heating zone, radiant tube heating zone, fast cooling zone and soaking zone of the furnace body.

[0039] Among them, when establishing a reducing atmosphere, the following steps are included: specifically, please refer to image 3 , which is a flow chart for establishing a reducing atmosphere in Example 2 of the present invention.

[0040] Step 211: Heating the furnace body; passing nitrogen gas into the furnace body from the soaking zone of the furnace body, so that the nitrogen gas flows to the fast cooling zone of the furnace body, the radiant tube heating zone, and the non-oxidizing heating zone in order to replace the oxygen in each zone, and Keep the oxygen content in each zone below 1000PPM.

[0041] In the present emb...

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Abstract

The invention discloses a reducing atmosphere creating method for a continuous annealing technology. The reducing atmosphere creating method includes the steps that 111, a furnace body is heated, nitrogen gas is guided into the furnace body from a soaking zone of the furnace body and sequentially flows to a fast cooling area, a radiant tube heating area and a non-oxidizing heating area, so that oxygen gas in the areas is replaced, and the content of the oxygen gas in the areas is lower than 1000 PPM; and 112, before a strip steel conveying production line is started, the dew point temperature of the furnace body is smaller than or equal to 35 DEG C, the temperature of the non-oxidizing heating area is greater than or equal to 650 DEG C, hydrogen gas is guided into the furnace body from the soaking zone of the furnace body and sequentially flows to the fast cooling area, the radiant tube heating area and the non-oxidizing heating area, and the hydrogen gas and the nitrogen gas are fully mixed to meet the required range of the reducing atmosphere. According to the method, a good reducing atmosphere is created before the strip steel conveying production line is started, and therefore the problem of dezincification on plate surfaces or pinhole-shaped steel exposure caused by poor reducing atmospheres can be reduced or eliminated in the starting process, the cleanliness of the plate surfaces can be improved in the starting process, and the defective percentage is lowered.

Description

technical field [0001] The invention relates to the technical field of continuous hot-dip galvanizing, galvanizing or aluminum plating of strip steel, and in particular to a method for establishing a reducing atmosphere for a continuous annealing process and the continuous annealing process. Background technique [0002] Continuous hot-dip galvanizing, galvalume and aluminum plating of strip steel are the most widely used metal antirust methods, and galvanized sheet, galvanized sheet and aluminum plate are also widely used in various fields such as industry. In the production process of hot-dip galvanizing, the annealing furnace process is an important process link, and its design largely determines the quality of galvanized sheets, galvanized sheets and aluminum-coated sheets. [0003] The existing annealing furnace process is mainly divided into five stages: preheating, non-oxidizing heating, radiant tube heating, fast cooling and soaking section. Firstly, in the preheati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/52
CPCC21D1/26C21D1/74C21D9/52
Inventor 董秋华刘克勤郑东蓝俊
Owner 华冠新型材料股份有限公司
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