How To Use Open-hearth furnace In A Sentence

• Manganese ores are used mainly in the manufacture of steel, the alloys spiegeleisen and ferromanganese being added to the molten steel after treatment in the Bessemer converter and open-hearth furnace in order to recarburize and purify the metal. The Economic Aspect of Geology
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• A plaque placed beside the mural, Spirit of Steel, notes that the scene depicts the entire steel manufacturing process, from the mining of coal and ore to the making of steel in open-hearth furnaces, to the finished steel shaft.
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• In the following years he reinvested profits to renovate the plants, raised additional money through bond issues, and replaced outdated open-hearth furnaces with modern production technologies.
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• After that would come the open-hearth furnaces, but they'd require a better supply of pig iron and a new building in which to build them.
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• The manufacture of steel was made possible by two new inventions, the Bessemer converter of 1856 and the Siemens-Martin open-hearth furnace of 1864.
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