How does charge ferrochromium differ from high-carbon ferrochromium?

The distinction between high-carbon ferrochromium and charge ferrochromium lies primarily in their chemical composition and the specific smelting conditions used during chromium processing.

• High-carbon ferrochromium: This alloy typically contains 4 to 6 percent carbon and less than 1.5 percent silicon. It is produced using lumpy, refractory ores and a viscous slag. Its production is more energy-intensive, requiring approximately 4,600 kilowatt-hours of electric power per ton of alloy.1
• Charge ferrochromium: This is a carbon-saturated alloy produced by adding more silica to the furnace charge. This process results in an increased silicon content, typically ranging from 2 to 6 percent, while maintaining a carbon level of 5 to 7 percent. The production of charge ferrochromium is more energy-efficient, consuming about 4,000 kilowatt-hours per ton.1

Both alloys are forms of ferrochromium, an alloy used to incorporate chromium into steel.21