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

• Main Authors: LANGE, KLAUS, MANFRED, KAZMIERSKI, JORG, KARSTEN, UTZ, KRAUTSCHICK, HANS-JOACHIM, WIEMER, DIRK, PULS, STEFAN, PETER, SCHAUER-PA?, JANINE, SCHUHMACHER, BERND, GLASS, ROMAN, KOLBE, NINA, WORSTER, FRANK
• Format: Patent
• Language: English
• Published: 27.10.2022
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING

The invention concerns a method for producing a flat steel product with high reflectivity, the surfaces of which have an arithmetic mean roughness Ra of less than 0.03 ?m and in which flat steel product, which on at least one surface has an arithmetic mean roughness Ra < 2 .5 ?m, is cold rolled in a plurality of rolling passes, the overall forming rate achieved through cold rolling is 75 - 90 %, the forming rate drops from rolling pass to rolling pass, the rolling pressure in the first rolling pass is 200 - 800 MPa and the rolling pressure in the final rolling pass is 1,000 - 4,000 MPa, the cold rolling takes place with the addition of a rolling oil with a viscosity of5 - 10 mm2 /s at 40 ?C, the rolling speed is> 200 m/min and the cold rolling at least in the final rolling pass takes place with a work roll having a mean roughness Ra< 0.01 ?m. The cold-rolled flat steel product is then annealed under a protective gas atmosphere and dry re-rolled. The invention also concerns a correspondingly produced flat steel product and a solar concentrator, produced from such a flat steel product.