| 摘要 |
<p>An additive composition for use in steel making, which comprises 84.8-99.3 % by weight of an oxide component; 0.5-1.6 % by weight of a metal component; and 0.04-0.07 % by weight of a rare-earth element component, is used in such a way that its four aliquots are each added in blast furnace. The amount of the composition to be added is dependent on the steel to be produced. It is used at an amount of 15-17 % by weight for special carbonic steel, at 18-20 % by weight for special tool and die steel and at 21-25 % by weight for special high-speed tool steel.</p> |
