Galvanized sheet metal itself does not possess magnetism. Galvanized sheet metal usually refers to a metal composite material coated with a layer of zinc on the surface of a metal sheet (such as a steel plate), with the main purpose of enhancing the corrosion resistance and service life of the metal sheet. Due to the fact that the galvanized layer is mainly composed of zinc, which is a non-magnetic material, the galvanized layer itself does not increase the magnetism of the metal sheet.

Meanwhile, although metal plates (such as steel plates) have a certain degree of magnetism, their magnetic strength depends on their composition and microstructure. For most galvanized sheet metals, the substrate (i.e. the metal sheet before galvanizing) may have some magnetism, but the galvanizing process does not change its basic magnetic properties. However, it should be noted that if the metal sheet has undergone special treatment (such as annealing) before galvanizing, it may have an impact on its magnetism.

In addition, in practical applications, some galvanized sheet metals may be used or processed together with magnetic materials, but this does not mean that galvanized sheet metals themselves have magnetism. It may simply serve as a carrier or support structure, in physical contact or interaction with magnetic materials.

In summary, galvanized sheet metal itself does not possess magnetism, and its magnetic properties mainly depend on the composition and microstructure of its substrate. During normal use and processing, the magnetic properties of galvanized sheet metals usually do not have a significant impact on their performance and effectiveness.