| 摘要 |
PURPOSE:To produce the title cast iron having high mechanical strength and toughness at a low cost by dephosphorizing molten iron in two stages to adjust the composition of the pretreated molten iron, and supplying the molten iron in a casting mold to cast the molten iron into a specified shape. CONSTITUTION:Blast-furnace molten iron is pretreated to reduce the content of impurities, especially phosphorus, to adjust the composition of the pretreated molten iron, and the molten iron is cast into a specified shape. In such a dephosphorizing stage, the molten iron is deslagged, the slag is removed, and the process is repeated twice. By this method, reinfiltration of phosphorus into the molten iron is practically prevented, the content of phosphorus is remarkably reduced, and the toughness can be increased. In addition, since the carbon content of the blast-furnace molten iron is close to the carbon content of the cast iron, the carbon content of the molten iron need not be sharply reduced. Moreover, since the cost of the blast-furnace molten iron itself is low, the production cost can be remarkably reduced.
|
