The invention relates to a steel sheet skin-pass rolled with a deterministic surface structure, and to a method for producing it.

A method for producing an internally and/or externally toothed pot-shaped sheet metal part having teeth extending toward the pot center axis, wherein an un-toothed pot-shaped sheet metal part is inserted into a die and then, by means of a relative movement between the sheet metal part and associated profile rollers, a profile is rolled onto the pot-shaped sheet metal part by the profile rollers applied to the sheet metal part and thus alternating internal and external gear teeth are applied to the sheet metal part, wherein the profile rollers form the sheet metal part oriented radially from the inside toward the outside, in that the profile rollers roll along the inner circumference of the sheet metal part.

A method and an apparatus for producing a microporous metal foil comprising (a) passing a metal foil through a gap between a pattern roll having large numbers of high-hardness, fine particles on the surface and a hard roll while pressing, to provide the metal foil with large numbers of fine penetrating pores, with a thin hard plastic film interposed between the metal foil and the pattern roll, and a thick soft plastic film interposed between the metal foil and the hard roll; and (b) adjusting tension applied to each of the metal foil, the hard plastic film and the soft plastic film to such an equal level that the metal foil is not broken during forming the fine penetrating pores.

Coated surfaces and coatings are described. The coated surfaces can include a surface coating comprising an alloy layer. The alloy layer can include molybdenum or tungsten in combination with one or more of nickel, cobalt, chromium, tin, phosphorous, iron, magnesium or boron Processes for producing the surface coatings are also described.

Devices with a moveable component that includes a coated surface are described. In some examples, the moveable component can contact a functional fluid during movement of the moveable component. The moveable component includes a coated surface with a surface coating comprising an alloy layer. The alloy layer comprises molybdenum or tungsten in combination with one or more other materials.

This application discloses methods of preparing a work roll for applying a dulled gloss finish on a metal substrate surface. The resulting finish has a fairly uniform glossiness with a slightly matted appearance and with minimal directionality. The work rolls have an Ra value of from 0.2 to 0.4 m and an Rz value of less than 3.0 m. Methods of forming a dulled gloss finish on a metal substrate are also described herein.

Processes for producing coated surfaces and coatings are described. The processes can be used to produce a surface coating comprising an alloy layer. The produced alloy layer can include molybdenum or tungsten in combination with one or more of nickel, cobalt, chromium, tin, phosphorous, iron, magnesium or boron or other materials.

Rods, pipes and internal cavities that include a coated surface are described. The rod or pipe can include an alloy layer on an external surface, an internal surface or both. The alloy layer can include molybdenum or tungsten and at least one element or at least one compound comprising one or more of nickel, cobalt, chromium, tin, phosphorous, iron, magnesium or boron.

Hydraulic devices that include a moveable component configured to contact a functional fluid during movement of the hydraulic device are described. The hydraulic device can include a coating on a surface. The coating can include a metal or metal alloy such as, for example, a molybdenum or tungsten in combination with one or more other materials.

The invention relates to a method for coating a mill roll by means of thermal spraying of a powder by means of a spraying column to form an isotropic roughness (Ra) on the surface of said mill roll, wherein the mill roll rotates at a speed (Vr) about the longitudinal axis thereof and the spraying column moves translationally at a speed (Vt), depositing the material in a helicoidal way. After establishing a granulometry (G) of powder to be sprayed, an objective roughness (Ra) and an objective thickness (t) of the coating, the corresponding feed flow (Fr) of powder is determined in an empirical table which shows the objective roughness (Ra) on the basis of the feed flow (Fr) and the granulometry (G) according to a pre-established formula, after which the rotational speed (Vr) and the translational speed (Vt) are defined from an equation that relates the objective coating thickness (t) as a function of the defined feed flow (Fr), the translational speed (Vt) and the rotational speed (Vr).