IRON-NICKEL ALLOY SHEET AND IRON-NICKEL-COBALT ALLOY SHEET FOR ELECTRONIC PARTS, EXCELLENT IN DEGREASING PROPERTY, AND THEIR PRODUCTION

摘要

PURPOSE: To produce an Fe-Ni alloy sheet and an Fe-Ni-Co alloy sheet for electronic parts, excellent in etching characteristic, by improving degreasing property. ;CONSTITUTION: An Fe-Ni alloy sheet or an Fe-Ni-Co alloy sheet, containing, by weight, 26-52% Ni and ≤0.1% Sn or further containing 1-20% Co, is used. This alloy sheet is subjected to a repetition of cold rolling and annealing, and then finish rolling is performed by using a dull roll at 15-80% rolling rate to regulate surface roughness to 40-200μm RSm and 0.3-1.5 Rsk. Subsequently, stress relief annealing is carried out in an atmosphere consisting of ≥1vol.% H₂, ≤0.02vol.% O₂, and the balance inert gas and having -10 to -60°C dew point. At this time, temp. is raised at (3 to 50)°C/sec temp. rise rate and annealing is performed at 450-690°C annealing temp., and then cooling is done at (3 to 150)°C/sec cooling rate.;COPYRIGHT: (C)1996,JPO