Soft magnetic alloy for clock-making
The invention relates to a soft magnetic alloy with the following composition in wt. %: 28%≦Ni≦34%, 0%≦Co≦4%, 0%≦Cu≦4%, 1%≦Cr, 0%≦Mo≦8%, 0%≦Nb≦1%, 0%≦Mn≦2%, 0%≦V≦5%, 0%≦W≦5%, 0%≦Si≦4%, 0%≦Al≦4%, 0%≦C≦0.4%, optionally one or several elements selected from magnesium and calcium the content of which is such as to remain below 0.1%, the rest being iron and impurities from production. The chemical composition furthermore satisfies the following relationships: 180.5≦6×Ni2.5×(Cr+Mo+V+W+Si+Al)+4×(Co+Cu)≦197.5 et Co+Cu≦4%. The invention relates to the use thereof for production of a stator for use in a motor for clock-making.
1. A soft magnetic alloy, the composition of which comprises, in % by weight:
28%≦Ni<34%
0%≦Co≦4%
0%≦Cu≦4%
1%≦Cr
1.5%≦Mo≦8%
0%≦Nb<1%
0%≦Mn<2%
0%≦V<5%
0%≦W<5%
0%≦Si<4%
0%≦Al<4%
0%≦C≦4%
optionally, one or more elements taken from magnesium and calcium in contents such that their sum remains less than 0.1%, the balance being iron and impurities resulting from melting, the chemical composition furthermore satisfying the relationships:
180.5≦6Ni−2.5(Cr+Mo+V+W+Si+Al)+4(Co+Cu)≦197.5 and
Co+Cu<4%.
2. The alloy as claimed in claim 1 , the composition of which is furthermore such that:
Cr≧2%.
3. The alloy as claimed in claim 1 , characterized furthermore in that:
Cr≦7.5%.
4. The alloy as claimed in claim 1 , characterized furthermore in that it contains less than 0.003% titanium.
5. The alloy as claimed in claim 4 , characterized furthermore in that it contains less than 0.002% titanium.
6. An electric motor for watchmaking, the stator of which consists of a soft magnetic alloy as claimed in claim 1 .
7. An electric motor stator for watchmaking, consisting of a soft magnetic alloy as claimed in claim 1 .