A metal wire, which is one of a tungsten wire and a tungsten alloy wire, includes alkali metal on the surface thereof. The amount of alkali metal is at most 2.0 g per 1 g of the metal wire.

One aspect relates to a process for preparing a ring electrode including the steps of a) providing a monolithic metal precursor, wherein the monolithic metal precursor includes an outer tube forming a first cavity of the precursor, and wherein the outer tube has a wall including in one section an inner tube forming a second cavity of the precursor; b) preparing a composite precursor by inserting a first sacrificial core element into the first cavity of the precursor provided in a) and a second sacrificial core element into the second cavity of the precursor provided in a); c) forming the composite precursor obtained in b) to obtain a formed composite having a smaller outer diameter than the composite precursor obtained in b); d) separating a composite disk from the formed composite obtained in c); e) removing the first and the second sacrificial core element from the composite disk obtained in d).

A steel material for a torsionally stressed component, such as a driveshaft, having a minimum tensile strength of 800 MPs, and the microstructure consists of more than 50 vol. % of bainite, having an alloy with the following composition in wt. %: C: 0.02 to 0.3; Si: up to 0.7; Mn: 1.0 to 3.0; P: max. 0.02; S: max. 0.01; N: max. 0.01; Al: up to 0.1; Cu: up to 0.2; Cr: up to 3.0; Ni: up to 0.3; Mo: up to 0.5; Ti: up to 0.2; V: up to 0.2; Nb: up to 0.1; B: up to 0.01; where 0.02Nb+V+Ti0.25, residual iron, and smelting impurities. The steel material is inexpensive and has good torsional fatigue strength when used for a torsionally stressed component. The invention also relates to a method for producing a component made of the material and to such a component.

Disclosed is a method for manufacturing a zinc wire. The method comprises melting a zinc ingot at a first temperature of 420 C. to 650 C. to form a molten zinc. Further, the method comprises calibrating a set of impurities in the molten zinc. Furthermore, the method comprises maintaining the molten zinc at a second temperature between 400 C. to 600 C. Subsequently, the method comprises fluxing the molten zinc to remove a non-metallic impurity. Further, the method comprises transferring the molten zinc into a casting mould to form a cast bar. Furthermore, the method comprises continuously feeding the cast bar from the casting mould to a rolling mill to form a rolled zinc wire rod. Finally, the method comprises drawing a zinc wire rod from the rolled zinc wire rod.

The invention relates to an alloy for manufacturing a tool intended for manufacturing aeronautical parts made of composite material, the alloy comprising by weight:

[00001]$\begin{array}{c}32.6\%\mathrm{Ni}38.\%\\ 0.8\%\mathrm{Co}4.2\%\end{array}$ Co1.00Ni %+36.80%, where Ni % denotes the Ni content in weight percent in the alloy; and Co1.63Ni %+62.72%, where Ni % denotes the Ni content in weight percent in the alloy,

[00002]$\begin{array}{c}1.\%\mathrm{Ti}2.\%\\ 0.001\%\mathrm{rare}\mathrm{earths}0.05\%\\ 0.1\%\mathrm{Si}0.35\%\\ 0.15\%\mathrm{Mn}0.6\%\\ 0.005\%C0.04\%\end{array}$ the remainder being iron and impurities resulting from the production process.

A tungsten wire has a resistivity of at least 6.2 .Math.cm and at most 6.9 .Math.cm, and a diameter of at most 50 m. Crystal grains of the tungsten wire include dislocation. For example, the tensile strength of the tungsten wire is at least 2200 MPa and at most 2800 MPa.

A tungsten wire contains tungsten or a tungsten alloy. An average width of surface crystal grains in a direction perpendicular to an axis of the tungsten wire is at most 76 nm. The tungsten wire has a tensile of at least 4800 MPa, and a diameter of at most 100 m.

According to one embodiment, a tungsten wire includes a tungsten alloy containing rhenium. The tungsten wire includes a protrusion peak density (Spd) of 7000 or more and 11000 or less as a surface roughness parameter.