Fe-Ni based permalloy and method of producing the same and cast slab

摘要

A Fe-Ni based permalloy comprises Ni: 70-85 wt%, C: not more than 0.015 wt%, Si: not more than 1.0 wt%, Mn: not more than 1.0 wt%, P: not more than 0.01 wt%, S: not more than 0.005 wt%, O: not more than 0.0060 wt%, Al: not more than 0.02 wt% and, if necessary, not more than 15 wt% of at least one selected from the group consisting of Mo, Cu, Co and Nb within a range of not more than 20 wt% in total. <IMAGE>