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Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing procedure

A control method and technology of annealing process, applied in the direction of quenching agent, manufacturing tools, heat treatment equipment, etc., can solve the problems of strip steel surface oxidation, bluing, yellowing and other problems, and achieve the effect of improving the oxidation color defects on the surface of dual-phase steel

Active Publication Date: 2016-06-08
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The application provides a method for controlling the oxidation color of dual-phase steel in the continuous annealing process of cold rolling, which solves or partially solves the problem of serious oxidation of the strip surface in the production method of dual-phase steel in the prior art, such as yellowing, darkening, and Blue and other oxidation color defects, resulting in the technical problem of poor surface quality of the steel plate, realized the technical effect that the oxidation color defects on the surface of the dual-phase steel were significantly improved during the continuous annealing process

Method used

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  • Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing procedure
  • Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing procedure

Examples

Experimental program
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Effect test

Embodiment 1

[0043] S1: Clean the dual-phase steel; during the cleaning process, reduce the inlet punching speed of the dual-phase steel, so that the time difference between the completion of the punching and the flicking of the same coil in the dual-phase steel is 10s. Before the dual-phase steel is sent into the annealing furnace, the relief valve from the heating section to the final cooling section in the relief device is opened 2 hours in advance, and the opening degree is 20%. Adjust the dew point from the heating section to the final cooling section to -47°C, and control the hydrogen content at 2.5%.

[0044] S2: Send the cleaned dual-phase steel into the annealing furnace for annealing treatment; the initial temperature setting value of the heating section is 6°C lower than the target value. The set value is adjusted to the target value. The temperature of the final cooling section is controlled at 111°C.

[0045] S3: The annealed dual-phase steel is water-quenched; during the wa...

Embodiment 2

[0049] S1: Clean the dual-phase steel; during the cleaning process, reduce the inlet punching speed of the dual-phase steel, so that the time difference between the completion of the punching and the flicking of the same coil in the dual-phase steel is 20s. Before the dual-phase steel is sent into the annealing furnace, the relief valve from the heating section to the final cooling section in the relief device is opened 2.5 hours in advance, and the opening degree is 25%. Adjust the dew point from the heating section to the final cooling section to -49°C, and control the hydrogen content at 2.7%.

[0050] S2: Send the cleaned dual-phase steel into the annealing furnace for annealing treatment; the initial temperature setting value of the heating section is 7°C lower than the target value. The set value is adjusted to the target value. The temperature of the final cooling section is controlled at 112°C.

[0051] S3: The annealed dual-phase steel is water-quenched; during the ...

Embodiment 3

[0055] S1: Clean the dual-phase steel; during the cleaning process, reduce the inlet punching speed of the dual-phase steel, so that the time difference between the completion of the punching and the flicking of the same coil in the dual-phase steel is 30s. Before the dual-phase steel is sent into the annealing furnace, the relief valve from the heating section to the final cooling section in the relief device is opened 2.8 hours in advance, and the opening degree is 30%. Adjust the dew point from the heating section to the final cooling section to -50°C, and control the hydrogen content at 2.8%.

[0056] S2: Send the cleaned dual-phase steel into the annealing furnace for annealing treatment; the initial temperature setting value of the heating section is 6°C lower than the target value. The set value is adjusted to the target value. The temperature of the final cooling section is controlled at 115°C.

[0057] S3: The annealed dual-phase steel is water-quenched; during the ...

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Abstract

The invention relates to a method for controlling the oxide color of dual-phase steel in the cold rolling continuous annealing procedure. The method comprises the following steps that the dual-phase steel is cleaned; in the cleaning process, the inlet punching speed of the dual-phase steel is reduced; the cleaned dual-phase steel is fed into an annealing furnace for annealing treatment; the annealing furnace comprises a heating segment, a soaking segment, a slow cooling segment, a quick cooling segment, an overaging segment and a final cooling segment, and the initial temperature set value of the heating segment is lower than the target value by 5 DEG C-10 DEG C; the temperature of the final cooling segment is controlled to range from 100 DEG C to 130 DEG C; the annealed dual-phase steel is subjected to water quenching; in the water quenching process, the electric conductivity of circulating water is smaller than 20+ / -10 microseconds / cm, the PH value is 8+ / -0.3, and the water temperature is smaller than 45 DEG C; and the dual-phase steel subjected to water quenching is leveled, and a finished product of the dual-phase steel is obtained. According to the method for controlling the oxide color of the dual-phase steel, the defect of the oxide color on the surface of the dual-phase steel is remarkably reduced in the continuous annealing process.

Description

technical field [0001] The invention relates to the technical field of cold rolling, in particular to a method for controlling the oxidation color of dual-phase steel in the continuous annealing process of cold rolling. Background technique [0002] In the continuous annealing process of cold rolling, the problem of surface oxidation color of dual-phase steel is very prominent. The traditional dual-phase steel production method one-sidedly emphasizes the low dew point and high hydrogen content of the furnace atmosphere, and the dew point used in actual production is too low and the hydrogen content is too high, not only the surface oxidation color problem is not improved obviously, but also causes nitrogen and hydrogen gas Consumption increases. For the cleaning in the cleaning section, attention is paid to the load of the brush roller, the temperature and concentration of the degreasing agent, but the influence of the cleaning time is ignored. There is no correct control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D1/26C21D1/60
CPCC21D1/26C21D1/60C21D8/0247
Inventor 王立朋吴伦童建佳常树林王硕陈文武张波张少波姜顺昱任秋红张阳阳巫雪松
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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