VERFAHREN ZUR HERSTELLUNG EINER LOCHMASKE

摘要

In this invention, a sheet steel is annealed and is subjected to skin-pass rolling of a reduction of 0.5-15% before forming a desired pattern of small holes therein with an etching (i.e. photoetching) method, thereby to provide a sheet steel having no elongation of the yield point and being slow in aging and to decrease the thermal deformation of the shadow mask by applying the residual stress occurring therein due to the skin-pass rolling.