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Cold Rolled Strip Steel Hot Galvanized Production Line

Cold rolled strip steel hot galvanized production line The early hot dip galvanization is to adopt the cold rolled sheet after annealing as the raw material to conduct hot dip galvanization method, so called the line outside annealing method.Typical YouHui Lin method, steel belt first dip...

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Cold rolled strip steel hot  galvanized production line

  

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     The early hot dip galvanization is to adopt the cold rolled sheet after annealing as the raw material to conduct hot dip galvanization method, so called the line outside annealing method.Typical YouHui Lin method, steel belt first dip coating and plating aid, to prevent oxidation in the heating process, and then through the oven to 250 degrees Celsius, in zinc pot galvanizing, this process is complex, and the product quality is poorer. 

    In 1931, poles, Jimmy, succeeded in steel strip continuous annealing technology and continuous hot dip galvanizing technology, on the same production lines, with two kinds of processes of production, not only save the process, and produce better quality galvanized sheet, this is a kind of method is retreated inside line, named Jimmy's method, sen Jimmy's line has two independent component of the heating furnace, steel strip by oxidationHeat a qualitative gas furnace to 450 degrees Celsius to remove grease from the surface of the steel strip, which is oxidized.And steel belt into the reduction furnace to the heating to 700 ~ 800 degrees Celsius, complete recrystallization annealing, reduction in furnace gas ammonia decomposition to fully restore oxide film on the surface of the steel belt and to prevent further oxidation steel belt, the steel strip is cooled to 480 degrees Celsius, into the zinc galvanized steel. Mr Jimmy's method is a leap of steel strip hot galvanizing technology, it formed the basis of the modern hot galvanizing technology, achieved a meter, the width of the product line speed reached 90 m/min, the steel strip surface no longer use additives, and the temperature and liquid zinc is consistent, makes the temperature of the zinc pot, aluminum content is easy to control, greatly improve the quality of the product.

















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