The invention includes a copper-nickel-zinc alloy with the following composition in weight %: Cu 47.0 to 49.0%, Ni 8.0 to 10.0%, Mn 0.2 to 0.6%, Si 0.05 to 0.4%, Pb 1.0 to 1.5%, Fe and/or Co up to 0.8%, the rest being Zn and unavoidable impurities, wherein the total of the Fe content and double the Co content is at least 0.1 weight % and wherein mixing silicides containing nickel, iron and manganese and/or containing nickel, cobalt and manganese are stored as spherical or ellipsoidal particles in a structure consisting of an - and -phase. The invention further relates to a method for producing semi-finished products from a copper-nickel-zinc alloy.

A copper alloy sputtering target is formed by a copper alloy including the content of Ca being 0.3 to 1.7% by mass, the total content of Mg and Al being 5 ppm or less by mass, the content of oxygen being 20 ppm or less by mass, and the remainder is Cu and inevitable impurities. A manufacturing method of a copper alloy sputtering target comprises steps of: preparing a copper having purity of 99.99% or more by mass; melting the copper so as to obtain a molten copper; controlling components so as to obtain a molten metal having a predetermined component composition by the addition of Ca having a purity of 98.5% or more by mass into the molten copper and by melting the

Ca; casting the molten metal so as to obtain an ingot; and performing stress relieving annealing after performing hot rolling to the ingot.

A pivotable tundish (1) for continuous casting a metal alloy. The tundish includes a body (3) with a first chamber (5), a second chamber (7), a first passage (12) between the first chamber and the second chamber, and a second passage (16) between the second chamber and a mold (9). The first chamber is adapted to receive and hold a base metal constituting the base for forming the metal alloy by addition of alloying elements. The metal alloy is fed from the second chamber to the mold through the second passage. The second chamber further includes a first portion (30) and a second portion (32), and a third passage (36) between the first portion and the second portion. In the casting state the metal alloy is formed while casting by adding the alloying elements to the second portion of the second chamber.

In a method of treating a material solvent, brass granules, copper granules, and carbon nanotubes are mixed, in the absence of silver, iron pyrite, and graphene, to form a first mixture. The first mixture is then added to a second mixture of brass and copper granules. The first and second mixtures are mixed until all of the granules of the second mixture of brass and copper are uniformly saturated with the first mixture, whereafter the second mixture is dried to form a treated material. The treated material can be mixed with one or more metals in a high-temperature crucible and heated until melted to form a metal alloy. Each of the one or more metals can be a ferrous and/or nonferrous metal. The melted metal alloy can be poured into a mold and allowed to cool and harden. The cooled and hardened metal alloy can be formed into a finished form via drawing through a die; continuous casting; or rolling.

The invention includes a copper-nickel-zinc alloy with the following composition in weight %: Cu 47.0 to 49.0%, Ni 8.0 to 10.0%, Mn 0.2 to 0.6%, Si 0.05 to 0.4%, Pb 1.0 to 1.5%, Fe and/or Co up to 0.8%, the rest being Zn and unavoidable impurities, wherein the total of the Fe content and double the Co content is at least 0.1 weight % and wherein mixing silicides containing nickel, iron and manganese and/or containing nickel, cobalt and manganese are stored as spherical or ellipsoidal particles in a structure consisting of an - and -phase. The invention further relates to a method for producing semi-finished products from a copper-nickel-zinc alloy.

A method of manufacturing sheet material made of copper-silver alloy, the method comprising the steps of: (a) casting continuously copper-silver alloy so as to obtain base material having a thickness or diameter within a range of 6 to 30 mm; (b) rolling the base material at least once so as to obtain sheet material having a thickness within a range of 0.01 to 0.10 mm; and (c) annealing the sheet material, wherein the sheet material having undergone operation in the step (c) has a Vickers hardness of 280 HV or higher.

A stranded wire conductor and a method for manufacturing a stranded wire, wherein the stranded wire conductor is made of a plurality of composite wire monofilaments stranded together, each having a nickel-tantalum-tungsten core wire, a conductive alloy tube wrapped around an outside of the nickel-tantalum-tungsten core wire, and a plating disposed on an outside of the conductive alloy tube. By stranding the plurality of composite wire monofilaments together to form the stranded wire conductor, and the composite wire monofilament is made of the nickel-tantalum-tungsten core wire, the conductive alloy tube, and the plating, the stranded wire conductor can still maintain a high strength and conductivity when operating at a temperature in a range of 600 C. to 700 C.

The invention includes a copper-nickel-zinc alloy with the following composition in weight %: Cu 47.0 to 49.0%, Ni 8.0 to 10.0%, Mn 0.2 to 0.6%, Si 0.05 to 0.4%, Pb 1.0 to 1.5%, Fe and/or Co up to 0.8%, the rest being Zn and unavoidable impurities, wherein the total of the Fe content and double the Co content is at least 0.1 weight % and wherein mixing silicides containing nickel, iron and manganese and/or containing nickel, cobalt and manganese are stored as spherical or ellipsoidal particles in a structure consisting of an - and -phase. The invention further relates to a method for producing semi-finished products from a copper-nickel-zinc alloy.

A copper alloy material production method is provided. A copper raw material including not higher than 30 ppm by mass of oxygen is melted to form a molten copper. Not lower than 4 ppm by mass and not higher than 55 ppm by mass of titanium is added to the molten copper. After the adding of the titanium, not lower than 100 ppm by mass and not higher than 7000 ppm by mass of magnesium is added.

A method of manufacturing sheet material made of copper-silver alloy, the method comprising the steps of: (a) casting continuously copper-silver alloy so as to obtain base material having a thickness or diameter within a range of 6 to 30 mm; (b) rolling the base material at least once so as to obtain sheet material having a thickness within a range of 0.01 to 0.10 mm; and (c) annealing the sheet material, wherein the sheet material having undergone operation in the step (c) has a Vickers hardness of 280 HV or higher.