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一、前言我厂多年来生产球墨铸铁一直用纯镁作球化剂,用密封自建压式压力加镁包处理铁水。虽然已经掌握了这种生产方法,但由于镁球铁固有的极易产生黑渣、缩松、皮下气孔等缺陷的性质,即使采取了水晶石集渣、防氧化及多次扒渣等措施也不能得到彻底解决。我厂镁球铁件的突出缺陷是黑渣,黑渣层厚度一般为10—20毫米,较严重的可达25—30毫米,如图1所示。用镁作球铁对微量铅、铋、钛等干扰元素敏感,因
I. Introduction I plant over the years the production of ductile iron has been used as a pure magnesium nodulizer, pressure with self-sealed pressure plus magnesium package treatment of hot metal. Although this production method has been mastered, due to the intrinsic defects of magnesia ductile iron, such as defects of black slag, shrinkage, and subcutaneous pores, even if measures such as crystal slag collection, oxidation prevention and multiple slag scraping are adopted Can not be completely solved. The outstanding defect of our factory magnesium iron ball is black slag, black slag layer thickness is generally 10-20 mm, more serious up to 25-30 mm, as shown in Figure 1. Ductile iron with magnesium for trace amounts of lead, bismuth, titanium and other sensitive elements, due to