HAIRSPRING MATERIAL FOR MECHANICAL TIMEPIECE AND HAIRSPRING USING THE SAME

摘要

[Problem] To provide a hairspring material for a mechanical timepiece, a variation in Young's modulus of which can be made smaller than that of conventional ones. [Solution] The hairspring material for a mechanical timepiece of the present invention comprises an alloy which contains 37.5 to 39.5% by mass of Ni, 9.2 to 9.9% by mass of Cr, 0.35 to 0.55% by mass of Ti and 0.6 to 0.9% by mass of Be, based on the total amount of the alloy, and contains a remainder including Fe and unavoidable impurities, said alloy being an alloy containing, as the unavoidable impurities, C (carbon), Mn in an amount of more than 0% by mass but not more than 0.5% by mass and Al in an amount of more than 0% by mass but less than 0.03% by mass, the amount of said C (carbon) being limited to not more than 0.03% by mass.

主权项

1. A hairspring material for a mechanical timepiece, comprising an alloy which contains 37.5 to 39.5% by mass of Ni, 9.2 to 9.9% by mass of Cr, 0.35 to 0.55% by mass of Ti and 0.6 to 0.9% by mass of Be, based on the total amount of the alloy, and contains a remainder comprising Fe and unavoidable impurities, said alloy being an alloy containing, as the unavoidable impurities, C (carbon), Mn in an amount of more than 0% by mass but not more than 0.5% by mass and Al in an amount of more than 0% by mass but less than 0.03% by mass, the amount of said C (carbon) being limited to not more than 0.03% by mass.