METHOD OF PRODUCING FE-NI SERIES ALLOYS HAVING IMPROVED EFFECT FOR RESTRAINING STREAKS DURING ETCHING

摘要

An ingot of Fe-Ni series alloy comprising 30 80 wt% of NI or further 0.001 - 0.03 wt% of B and the balance of Fe is upset at a forging ratio of at least 1/1.2U, hot forged at a total sectional reduction ratio of at least 30% to from a slab, from which fine crystal grains are formed at final heat treating stage, whereby Fe-Ni series alloys for electronic and electromagnetic materials are economically produced without generating streaks at the etching.