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>  Properties and Occurence

Chromium, symbol Cr, gray metallic element that can take on a high polish. The atomic number of chromium is 24; the element is one of the transition elements of the periodic table.


More than half the production of chromium goes into metallic products, and about another third is used in refractories. It is an ingredient in several important catalysts. The chief use of chromium is to form alloys with iron, nickel, or cobalt. The addition of chromium imparts hardness, strength, and corrosion resistance to the alloy. In the stainless steels, chromium makes up 10 percent or more of the final composition. Because of its hardness, an alloy of chromium, cobalt, and tungsten is used for high-speed metal-cutting tools. When deposited electrolytically, chromium provides a hard, corrosion-resistant, lustrous finish. For this reason it is widely used as body trim on automobiles and other vehicles. The extensive use of chromite as a refractory is based on its high melting point, its moderate thermal expansion, and the stability of its crystalline structure.

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metallic products, transition elements, crystalline structure, periodic table, refractories, high melting point, tungsten, cobalt, nickel, corrosion resistance, hardness, alloys, automobiles, ingredient, iron, stability, strength, percent, vehicles, reason, body, Uses

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