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钙和其同族元素在铁水凝固时对石墨的结晶起非常有效的作用,但是钙一方面在铁水中难于熔解,另外它也易于和硫、气体及悬浮状夹杂物起反应。为了使在铁水中难熔的,存在极少量的钙等元素在铁水中起有效的孕育作用,应尽可能减少与钙易引起反应的气体元素和夹杂物的含量。为此,对不同成分的铁水,试验用多孔塞吹入氩气、氮气和二氧化碳等气体,在尽量去除铁水中气体和夹杂物后,再加
Calcium and its congeners play a very effective role in the crystallization of graphite in the solidification of molten iron. However, calcium, on the one hand, is difficult to melt in molten iron and, on the other, it easily reacts with sulfur, gases and suspended inclusions. In order to make refractory in molten iron, there is a very small amount of calcium and other elements in the hot metal to play an effective role in breeding, should be as easy as possible to reduce the calcium-reactive gas elements and inclusions content. To this end, different components of hot metal, test porous plug blown with argon, nitrogen and carbon dioxide and other gases, as much as possible to remove the hot metal gas and inclusions, plus