| 摘要 |
<p>The formation of inclusions in an ingot of killed or semi-killed steel is prevented by raising the temp. of the liquid steel, prior to casting, to 20 degrees C above the temp. at which the steel solidifies. The melt in the ingot mould is covered either during or immediately after casting, depending on whether the mould is filled from the bottom or top, with an exothermic agent. This agent is highly combustible in order to raise the total heat content per ton of molten steel to >1800 kcal. The time from the exothermic reaction to the max. temp. is not >4 min.</p> |
