以铁屑压块为炉料,采用中频感应电炉熔炼生产厚大灰铁件,加工后出现一种裂纹状缺陷,经分析排除了缩松、渣孔,确认为析出性气孔,并对其产生的原因进行了分析。采取严格炉料管理、铁液升温至1 500~1 520℃静置5 min、控制铁屑压块用量不超过30%的措施,完全消除了该缺陷。 Iron scrap briquetting is used as the charging material, the medium-frequency induction electric furnace is used for smelting and manufacturing of large gray iron parts. After processing, a kind of crack-like defect appears, and the shrinkage and slag holes are excluded after the analysis, and the precipitated pores are confirmed, The reason is analyzed. Take strict charge management, the liquid iron heating to 1 500 ~ 1 520 ℃ for 5 min, the amount of iron scrap control does not exceed 30% of the measures to completely eliminate the defect.