The galvanized sheet iron and its production method of being superior in surface quality

摘要

Topic It is used mainly in the one for internal board of the automobile high intensity as a black sheet, it offers the galvanized sheet iron which is superior in processability and surface quality.Solutions As for this steel sheet, weight % with, C: 0.04 - 0.25%, Mn: 0.2 - 2.5%, Si: 0.01 - 1.7%, Al: 0.01 - 1.5%, P: 0.01 - 0.1%, S: 0.02% or less, Sb: It includes 0.001 - 0.1%, residual Fe and in addition is constituted with the inevitable impurity, description above Si and Al fills up 0.5 Si+Al 2.0, when thickness of oxide layer of that surface after the cold rolled, being the annealing, it features that it is controlled 1 millimicrons or less. Selective figure Figure 1