Metallurgy - 11: The Making of Steel, Oxygen Furnace
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The first way to reduce the carbon is the basic oxygen furnace steel making process.

In this process, the amount of carbon is decreased by regulating the amount of oxygen that is injected into the pig iron. The oxygen removes the unwanted carbon by oxidation. This unwanted carbon, together with a mixture of other impurities constitutes the slag and is removed from the furnace.
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