Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-grey, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point.
C 2065 (OTTO) Chromium sputtering target, diam. × thickness 50 mm × 5 mm, 99.99% - used in jet engines and gas turbines in lieu of common structural materials.