Patent ID: 11913106
Assignee: SAS INNO TECH CONSEILS
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 9:
10. The balance-wheel and hairspring combination of claim 8 comprising:
the hairspring produced from metastable β titanium alloy, said metastable β titanium alloy comprising, as a percentage by weight, between 24 and 45% niobium, between 0 and 20% zirconium, between 0 and 10% tantalum and/or between 0 and 1.5% silicon and/or less than 2% oxygen, said alloy having a crystallographic structure comprising:
a mixture of austenitic phase and alpha phase;
a presence of omega-phase precipitates the volumetric concentration of which is less than 10%; and
a balance-wheel made from metastable β titanium alloy wherein the alpha phase and the omega phase are present in the form of precipitates within a matrix constituted by austenitic grains.