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Converting (metallurgy)
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<p>Converting is a type of metallurgical <a href="/facts/Smelting/Ghdvhlga">smelting</a> that includes several processes; the most commercially important form is the treatment of molten metal <a href="/facts/Sulfide/d8YMjLeu">sulfides</a> to produce crude metal and <a href="/facts/Slag/LD3qEAlV">slag</a>, as in the case of copper and nickel converting. A now-uncommon form is batch treatment of pig iron to produce steel by the Bessemer process. The vessel used was called the <i>Bessemer converter</i>. Modern steel mills use <a href="/facts/Basic_oxygen_process/yg5Ht8fC">basic oxygen process</a> converters. </p>