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 3617 (OTTO) Chromium sputtering target, diam. x thickness 50.6 mm x 3 mm, 99.99% - used in jet engines and gas turbines in lieu of common structural materials.