| 摘要 |
<p>A method of operating an electric furnace which permits judging whether or not the state in which slag is produced in the electric furnace steel production is allowable by measuring the NOx content in the exhaust gas and which conditions the forming state to keep molten steel completely out of contact with the air so as to achieve a low nitrogen content consistently when the molten steel is tapped, or which can reduce the power unit consumption. When scrap iron is successively melted, refined and heated in an electric arc furnace to produce molten steel, the NOx content of the exhaust gas is measured in refining and heating the molten metal to judge the slag forming state in accordance with the measured values. Further, the electric furnace is operated by utilizing the judging method.</p> |
