在球墨铸铁中,硅是强烈的石墨化元素,因此它在球墨铸铁中视不同的断面与要求,对硅量应作一定的控制。一般在炉前都以观察三角试片的白口深度来判断铸铁的碳硅当量,然后在炉前用硅铁来调整硅的含量。对球墨铸铁来讲难以达到预期的要求。对较高牌号的球墨铸铁碳硅当量要求较高,因 In nodular cast iron, silicon is a strongly graphitized element, so it depends on different sections and requirements in the ductile iron, and the amount of silicon should be controlled. Generally in front of the furnace to observe the white triangle depth of the test piece to determine the carbon-silicon equivalent of cast iron, and then use ferrosilicon to adjust the silicon content in front of the furnace. Ductile iron in terms of difficult to achieve the desired requirements. Higher grades of ductile iron carbon-silicon equivalent higher requirements, because