公开(公告)号：US20240254606A1

公开(公告)日：2024-08-01

申请号：US18561557

申请日：2022-05-13

申请人： NIPPON STEEL Chemical & Material Co., Ltd.

发明人： Hiroto UNNO ,  Atsushi YASHIRO ,  Hiroaki OHARA ,  Ayaka SAWADA ,  Naoki FUJIMOTO ,  Naoya SAWAKI

IPC分类号： C22C38/52 ,  C21D7/02 ,  C21D7/13 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/50

CPC分类号： C22C38/52 ,  C21D7/02 ,  C21D7/13 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/50

摘要： The present invention addresses the problem of reducing the cause of etching failure or pinholes as much as possible in an extremely thin ferrous alloy foil that has a thickness of 10-30 μm and that is applied to a metal mask used for increasing the precision of an electronic component. In order to solve the abovementioned problem, the present invention provides a ferrous alloy foil that has a composition containing at most 0.150% of C, at most 2.00% of Si, at most 10.00% of Mn 2.00-50.00% of Ni, at most 19.00% of Cr, at most 0.20% of N, at most 0.030% of Al, at most 5.00% of Co, at most 0.0005% of Mg, at most 0.0005% of Ca, at most 0.01% of Ti, at most 0.035% of P, and at most 0.0300% of S, with the balance consisting of Fe and impurities. The amount of Al2O3 is at most 30 mass % and the amount of MgO is at most 15 mass % with respect to the total mass of inclusions having a particle diameter of 2.00 μm or larger, and among the inclusions having a particle diameter of 2.00 μm or larger, the number ratio of inclusions having a particle diameter of no larger than 5.00 μm is 80.00% or higher.