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Cold Rolling Hot Galvanizing Unit

Cold rolled galvanized the unit back and principle Cold rolled galvanized The main task of the Cold rolled galvanized Even back units main task even return units after the task is to cold rolling strip surface clean through decarburization and recrystallization annealing, the elimination of the...

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Cold rolled galvanized the unit back and principle

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 Cold rolled galvanized The main task of the 

     Cold rolled galvanized  Even back units main task even return units after the task is to cold rolling strip surface clean through decarburization and recrystallization annealing, the elimination of the strip in cold rolling process of stress, grain growth, and coated with insulation layer, the carbon content in steel control to 30 parts per million, to ensure that the magnetic

, mechanical properties to meet user needs.

     Cold rolled galvanized Main functions of the unit are as follows:

    (1) clean the surface dirt of cold rolled strip;

    (2) eliminate internal stress of cold rolled strip;

    (3) control the carbon content in steel to below 30ppm:

    (4) complete recrystallization and make recrystallized grains grow, and finally form perfect and uniform recrystallized grains.Obtain the required magnetism of the finished product:

    (5) apply insulation layer on the surface of strip steel to obtain necessary insulation performance.

    Process principle of the unit

    The ca1-4 unit first removes oil stains on the strip surface by means of spraying, cleaning and electrolytic cleaningImpurity, and then make the strip steel through the annealing furnace to carry out the process control process such as heating, equalizing heat and cooling, so as to achieve decarburization.To eliminate the stress recrystallization and grain growth of cold rolling and to coat the surface of the strip with insulation after continuous annealingLayer to ensure that magnetic energy, mechanical properties and surface quality meet the requirements. The carbon content of strip steel is generally controlledUnder 30ppm, the strip is kept flat by tension control during annealing.

     skim docin co after acid continuous rolling of strip steel in 70 ~ 80 ℃ before annealing, concentration of 3% ~ 5% of the lyeRemove the residual rolling oil and other grime on the surface of the strip to prevent damage to the protective atmosphere in the furnaceSound decarburization efficiency. Oil pollution can damage the quality of the steel strip, affect the quality of the coating, and cause the bottom roller knotSurface defects such as scratch on strip surface. After alkaline washing, the strip is washed and dried by hot water. Strip surface cleaning quality andLye temperature, concentration, speed of strip operation and other factors. Check the cleaning effect of strip surfaceWhite toilet paper is wiped on the steel plate after hot air drier, if there is black mark on white paper, explain caustic wash not.Clean, need to adjust process parameters.


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