A method for producing a metal film from an alloy consisting of (in % by mass) W 5 to 30 %, wherein W can be completely or partly replaced by Mo, Mg 0.0001 to 0.050 %, wherein Mg can be completely or partly replaced by Ca, if required Ti max. 0.10 % Al max. 0.10 % B max. 0.020 % Fe max. 1,0 % Co max. 1,0 % Mn max. 0.20 % Si max. 0.20 % Cr, Cu, Nb respectively max. 0.20 % P max. 0.020 % C max. 0.050 % N max. 0.020 % S max. 0.020 % Ni rest (> 50 %) as well as the usual impurities resulting from the smelting process comprising the following process steps: (a) an amount of more than one ton of the alloy will be smelted in a vacuum induction furnace or openly in an induction or electric arc furnace, followed by a treatment in a VOD or VLF installation, (b) afterwards, the alloy will be cast into ingots, electrodes or as continuous casting for forming a primary product, optionally followed by a one-time or repeated remelting by means of VAR and/or ESU (c) afterwards, the primary product will be optionally annealed at temperatures comprised between 800 and 1350°C during a period of 1 h through 300 h in air or protective gas, (d) then, the primary product will be hot-formed, especially hot-rolled, at temperatures comprised between 1300°C and 600°C, wherein the thickness of the original material will be reduced by the factor 1.5 - 200, such that the primary product will have a thickness comprised between 1 and 100 mm after the rolling and is not recrystallized and/or recovered and/or is (dynamically) recrystallized with a grain size of less than 300 μm, in particular less than 150 μm, (e) the primary product will afterwards be stained and/or grinded, (f) then, for producing a film, the primary product will be cold-formed to a final thickness comprised between 10 and 300 μm, in particular between 40 and 150 μm, with a degree of deformation of more than 90 %, wherein the cold-forming is carried out with rolls having a defined surface for setting roughnesses of less than 2 μm, (g) after the cold-forming the film will be cut into strips of 5 to 300 mm, (h) afterwards, the film strips will be coated with a ceramic powder in a loose manner or by means of an adhesive or by means of an oxide dissolved in alcohol or will be covered by a separating foil and optionally dried, (i) then, the film strips will be wound up in an annular manner on one or more mandrels or one or more sleeves, wherein the inner and the outer ends will be respectively fixed by means of spot-welding or clamping, (j) the film strips which have been wound up in an annular manner will then be annealed in protective gas at temperatures comprised between 600 and 1200°C during a period of 1 min through 300 h, (k) wherein after this annealing the annealed film-like material will be recrystallized and comprise a high proportion of cubic texture. (a) an amount of more than one ton of the alloy will be smelted in a vacuum induction furnace or openly in an induction or electric arc furnace, followed by a treatment in a VOD or VLF installation, (b) afterwards, the alloy will be cast into ingots, electrodes or as continuous casting for forming a primary product, optionally followed by a one-time or repeated remelting by means of VAR and/or ESU (c) afterwards, the primary product will be optionally annealed at temperatures comprised between 800 and 1350°C during a period of 1 h through 300 h in air or protective gas, (d) then, the primary product will be hot-formed, especially hot-rolled, at temperatures comprised between 1300°C and 600°C, wherein the thickness of the original material will be reduced by the factor 1.5 - 200, such that the primary product will have a thickness comprised between 1 and 100 mm after the rolling and is not recrystallized and/or recovered and/or is (dynamically) recrystallized with a grain size of less than 300 μm, in particular less than 150 μm, (e) the primary product will afterwards be stained and/or grinded, (f) then, for producing a film, the primary product will be cold-formed to a final thickness comprised between 10 and 300 μm, in particular between 40 and 150 μm, with a degree of deformation of more than 90 %, wherein the cold-forming is carried out with rolls having a defined surface for setting roughnesses of less than 2 μm, (g) after the cold-forming the film will be cut into strips of 5 to 300 mm, (h) afterwards, the film strips will be coated with a ceramic powder in a loose manner or by means of an adhesive or by means of an oxide dissolved in alcohol or will be covered by a separating foil and optionally dried, (i) then, the film strips will be wound up in an annular manner on one or more mandrels or one or more sleeves, wherein the inner and the outer ends will be respectively fixed by means of spot-welding or clamping, (j) the film strips which have been wound up in an annular manner will then be annealed in protective gas at temperatures comprised between 600 and 1200°C during a period of 1 min through 300 h, (k) wherein after this annealing the annealed film-like material will be recrystallized and comprise a high proportion of cubic texture.