Martin, Pierre Émile (1824–1915)
French engineer who developed the open-hearth process of steel manufacture. The Siemens-Martin process pre-heats the air-blast by a heat-regeneration method and the excess carbon is removed by adding a calculated amount of iron ore. By applying this process to an open-hearth furnace charged with a mixture of pig iron and wrought iron, Martin was able to obtain the desired carbon content simply by dilution.
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