Copper-zinc-nickel-manganese alloys

A watch component composed of a tetragonal age-hardened alloy consisting essentially of:

• 36 to 44% copper,
• 21 to 28% in toto of zinc with or without and/or indium, provided that tin and/or indium if present amount together to at most 10%,
• 18 to 25% in toto of nickel with or without cobalt, provided that cobalt if present amounts to at most 5%,
• 10 to 18% manganese
• up to 0.5% of at least one of beryllium and the rare-earth metals, provided that neither the beryllium content nor the rare-earth metals content exceeds 0.3%,
• additives from the group lithium, magnesium, calcium and titanium, serving as deoxidizing elements, and iron as the usual impurity.

A spring composed of a tetragonal age-hardened alloy consisting essentially of:

• 36 to 44% copper,
• 21 to 28% in toto of zinc with or without tin and/or indium, provided that tin and/or indium if present amount together to at most 10%,
• 18 to 25% in toto of nickel with or without cobalt, provided that cobalt if present amounts to at most 5%,
• 10 to 18% manganese,
• up to 0.5% of at least one of beryllium and the rare-earth metals, provided that neither the beryllium content nor the rare-earth metals content exceeds 0.3%,
• additives from the group lithium, magnesium, calcium and titanium, serving as de-oxidizing elements, and iron as the usual impurity.

An electric contact part composed of a tetragonal age-hardened alloy consisting essentially of

• 36 to 44% copper,
• 21 to 28% in toto of zinc with or without tin and/or indium, provided that tin and/or indium if present amount together to at most 10%,
• 18 to 25% in toto of nickel with or without cobalt, provided that cobalt if present amounts to at most 5%,
• 10 to 18% manganese,
• up to 0.5% of at least one of beryllium and the rare-earth metals, provided that neither the beryllium content nor the rare-earth metals content exceeds 0.3%,
• additives from the group lithium, magnesium, calcium and titanium, serving as de-oxidizing elements, and iron as the usual impurity.

A watch component comprising a tetragonal age-hardened alloy consisting essentially of:

• 38 to 42% copper,
• 23 to 26.5% in toto of zinc with or without tin and/or indium,
• 19.5 to 22.5% in toto of nickel with or without cobalt,
• 12 to 16% manganese, and
• 0.05 to 0.4% of at least one of beryllium and the rare-earth metals.

A spring composed of a tetragonal age-hardened alloy consisting essentially of:

• 38 to 42% copper,
• 23 to 26.5% in toto of zinc with or without tin and/or indium,
• 19.5 to 22.5% in toto of nickel with or without cobalt,
• 12 to 16% manganese, and
• 0.05 to 0.4% of at least one of beryllium and the rare-earth metals.

A electric contact part, comprising a tetragonal age-hardened alloy consisting essentially of

• 38 to 42% copper,
• 23 to 26.5% in toto of zinc with or within tin and/or indium,
• 19.5 to 22.5% in toto of nickel with or without cobalt, 12 to 16% manganese, and
• 0.05 to 0.4% of at least one of beryllium and the rare-earth metals.

A watch component comprising a tetragonal age-hardened alloy consisting essentially of

• 24.8% in toto of zinc, with or without tin and/or indium,
• 21% in toto of nickel with or without cobalt,
• 14% manganese, and
• 0.2% of at least one of the beryllium and the rare-earth metals the balance other than the additives and the iron being copper.

A spring composed of a tetragonal age-hardened alloy consisting essentially of:

• 24.8% in toto of zinc, with or without tin and/or indium,
• 21% in toto of nickel with or without cobalt,
• 14% manganese, and
• 0.2% of at least one of the beryllium and the rare-earth metals, the balance other than the additives and the iron being copper.

An electric contact part comprising a tetragonal age-hardened alloy consisting essentialy of:

• 24.8% in toto of zinc, with or without tin and/or indium,
• 21% in toto of nickel with or without cobalt,
• 14% manganese, and
• 0.2% of at least one of the beryllium and the rare-earth metals, the balance other than the additives and the iron being copper.