| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the service lives of furnaces and to reduce the cost of lining refractories, at the time of melting a stainless steel in blast furnaces, by alternately executing smelting reduction blowing and decarburization blowing in the same blast furnace. SOLUTION: A stainless steel is melted by smelting reduction by ores contg. Cr or Cr and Ni or smelting reduction blowing of melting molten metal contg. Cr or Cr and Ni and decarburization blowing of decarburizing and smelting the molten metal. At this time, simultaneously working two blast furnaces are used, smelting reduction blowing and decarburization blowing are alternately executed per 1 to 10 charge in each blast furnace, and lining refractories are always coated with slag. In this way, the stainless steel can be melted at an inexpensive refractory cost, and the service lives of the furnaces can be improved.</p> |
