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The traditional steelmaking process, all the melting phase of molten steel in the high nitrogen content, due to the use of high nitrogen content of the scrap, slag formation delay or feeding in the early slag formation material, such as iron ore or directly in the smelting process reduced iron, and CO production in the smelting process.
BOF scrap the proportion of low nitrogen content of 35% to 65% in the pilot production process, early slag material such as iron ore, the amount of change from 0 ~ 15kg / t, while the use of cast iron to cause the carbon loaded in the feeding increase between 6 ~ 18% change. Found by the test, dissolved [C] more, dissolved in the molten steel [N] With the decline. BOF scrap the amount of the nitrogen content of the complete melting stage also affect the general trend is that the BOF scrap to join the greater proportion of the lower nitrogen content. However, due to the high cost of BOF scrap, so the production furnace feed ratio is limited to maximum 45% to 50%, and joined the cast iron into phosphorus, which will join the cast iron limit on the maximum 15%. Mixed use of these measures, the content of dissolved nitrogen in the test furnace can be reduced to 50 ~ 58ppm.
Found in traditional refining furnace, the nitrogen content increased 5ppm, not down. Melting open lightning arc, no decarburization boiling and no slag foaming. In the trial, in order to control the melting and refining the process of nitrogen involved in using the foamy slag protection arc, and 0.20% ~ 0.40% of the decarburization boiling.