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 3251 (OTTO) Chromium chunks, 2-15 mm (0.08-0.59in), 99.99% Cas 7440-47-3 - used as catalysts for processing hydrocarbons.