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 0664 (OTTO) Chromium pieces, 2-3mm (0.08-0.12in) thick, 99.995% (metals basis) - used in the chemical, refractory, and foundry industries.