METHOD FOR PRODUCING A FLAT STEEL PRODUCT HAVING HIGH REFLECTIVITY, FLAT STEEL PRODUCT, AND MIRROR ELEMENT FOR SOLAR CONCENTRATORS.

摘要

The invention relates to a method for producing a flat steel product having high reflectivity, the surfaces of which have an arithmetic mean roughness Ra less than 0.03 µm, wherein flat steel product having an arithmetic mean roughness Ra 2.5 µm on at least one surface is cold-rolled in several rolling passes, the total deformation rate achieved by means of the cold rolling is 75 - 90%, the deformation rate decreases from rolling pass to rolling pass, the rolling pressure in the first rolling pass is 200 - 800 MPa and the rolling pressure in the last rolling pass is 1000 - 4000 MPa, a rolling oil having a viscosity of 5 - 10 mm2/s at 40 °C is added during the cold rolling, the rolling speed is 200 m/min, and the cold rolling is performed by means of a working roller having a mean roughness Ra 0.01 µm at least in the last rolling pass. Then the cold-rolled flat steel product is annealed under a protective gas atmosphere and rerolled dry. The invention further relates to a flat steel product produced accordingly and a solar concentrator produced from such a flat steel product.