A steel mill or steelworks is an industrial plant for the manufacture of steel. It may be an integrated steel works carrying out all steps of steelmaking from smelting iron ore to rolled product, but may also be a plant where steel semi-finished casting products are made from molten pig iron or from scrap. HistorySince the invention of the , steel mills have replaced , based on or methods. New ways to produce steel appeared later: from scrap melted in an and, more recen. .
An integrated steel mill has all the functions for primary steel production: • (conversion of to liquid iron),• (conversion of to liquid steel),. .
A minimill is traditionally a secondary steel producer; however, (one of the world's largest steel producers) and use minimills exclusively. Usually it obtains most of its iron from. [pdf]
A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. [pdf]
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