cast iron nails

Purpose of galvanized hexagonal net: building wall fixed, heat preservation, heat insulation

C, coating uniformity: galvanized layer is basically uniform with copper sulfate solution test etched five times without exposing iron.

That said, it can always deform by pulling hard without changing its integrity, so cold drawing has usually reached a limit, which is not a problem, because without this property it increases hardness, which is the desired effect. Cold wire drawing encountered more rain, when the climate is wet, easy oxidation and rust. Therefore, in the storage process should pay attention to avoid rust.