| 摘要 |
<p>1508591 Producing steels and ferrous alloys I G NIXON 18 Feb 1975 [26 Feb 1974] 8576/74 Heading C7D Steel, an alloy steel or a ferrous alloy is produced by charging steel, scrap, Fe sponge, cast iron or a mixture thereof to a converter, preferably an electric converter, together with a ferro-alloy and a flux and refining the melt with a decarburizing gas which is reducing to wustite at the refining temperature. The gas is preferably a mixture of CO/CO 2 /H 2 /H 2 O and optionally N2 formed by burning a hydrocarbon e.g. methane, natural gas, in 02 or air, the molar ratio of H 2 O/H 2 being not greater than 0À45, and the CO content being preferably greater than 10% vol. The ferro-alloy is preferably high-C ferrochrome, and the flux CaO+MgO. The decarburizing gas leaving the converter is quenched with a hydrocarbon stream, the reducing gas produced being used for ore reduction or as a fuel. Examples relate to the production of Cr steels (Examples 1, 3).</p> |
