A METHOD FOR MANUFACTURING AN IRON-NICKEL-BASED ALLOY THIN STRIP

摘要

PPROBLEM TO BE SOLVED: To provide a method for producing an Fe-Ni based alloy thin sheet which can solve the problem particularly on heating shrinkage, can realize excellent flatness even in the case of a wide width of 60 mm for example, and is used as the stock for a lead frame, the stock for a lead or the like. PSOLUTION: In the method for producing an Fe-Ni based alloy thin sheet, after final cold rolling, straightening by a leveler is performed, stress relieving annealing by a continuous annealing furnace is performed subsequently to the straightening by the leveler, and thereafter, thread coiling-slit processing is performed. Preferably, the stress relieving annealing by the continuous annealing furnace is performed at a furnace tension of 20 N/mmSP2/SP, and, more preferably, the stress relieving annealing is performed at 400 to 750C. PCOPYRIGHT: (C)2006,JPO&NCIPI