Chromium is a chemical element which has the symbol Cr and atomic number 24, first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odourless, tasteless, and malleable. It was discovered by Louis Nicolas Vauquelin in the mineral crocoite (lead chromate) in 1797. Crocoite was used as a pigment, and after the discovery that the mineral chromite also contains chromium this latter mineral was used to produce pigments as well.

Chromium was regarded with great interest because of its high corrosion resistance and hardness. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding chromium and nickel to form stainless steel. This application, along with chrome plating (electroplating with chromium) are currently the highest-volume uses of the metal. Chromium and ferrochromium are produced from the single commercially viable ore, chromite, by silicothermic or aluminothermic reaction or by roasting and leaching processes. Although trivalent chromium (Cr(III)) is required in trace amounts for sugar and lipid metabolism in humans and its deficiency may cause a disease called chromium deficiency, hexavalent chromium (Cr(VI)) is toxic and carcinogenic, so that abandoned chromium production sites need environmental cleanup.


Material Chrome Type I Chrome Type II
Cr2O3 48-50%, Basic 48% 58-60%, Basic 56%
Al2O3 15% max 15% max
MgO 14% max 14% max
SiO2 6.5% max 15.% max
Phos 0.007 PCT max 0.007% max
Sulphur 0.03 PCT max 0.01% max
Cr:Fe 2.45:1 min 3:1 min, normally 3.5:1
Size 0-10mm 90 PCT min 0-3 mm 90% min
Packing Loose 1MT approx. Jumbo bag

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