THE METHOD OF DEVELOPING HOT DIP GALVANNEALED STEEL SHEET OF TRANSFORMATION INDUCED PLASTICITY STEEL WITH GOOD ADHESION PROPERTY

摘要

the present invention is used for automobiles and transformation of organic plastic reinforcement lessons galvannealed steel sheet manufacturing method of will. ; specifically, the carbon (C): 0.05~0.2wt%, silicon (Si): 0.2~2.0wt%, manganese (Mn): transformation of organic plastic cold-rolled steel sheet containing 0.2~3.0wt% degreasing and zinc plating in the first plating bath after the pickling and pre-heated to 400~500 first, by annealing at a rate of 2~100 / sec after the recrystallization annealing in the two-phase temperature range of 650~900 cooling to 300 ~580 galvanized again in the second plating bath after standing for more than 10 minutes at a temperature of , and that the alloying heat treatment after the 450 for more than 2 minutes at a temperature of ~650 Fe% in the coating layer to a 5 to 20% range, and the retained austenite volume fraction of the steel organization and method of 2 to 20% by the coating adhesion to meet the excellent transformation organic plastic Steel galvannealed steel sheet with its contents.