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随着机床工业对灰铸铁要求的提高,HT30—54和HT35—61高牌号铸铁的生产正日益广泛。目前国内普遍应用的75硅铁孕育处理,由于孕育衰退快,白口敏感性大,断面均一性差,变质效果不良,已不能满足要求。为此,我们结合高牌号灰铸铁的生产,研制了钡基、锶基和锆基等几种高效孕育剂,并浇注了100多吨铸件。钡基孕育剂已投产应用,取得了内在质量、加工性能和表面状态都比较理想的效果。
With the increasing demand for gray iron in the machine tool industry, the production of HT30-54 and HT35-61 high grade cast iron is becoming more widespread. At present, the commonly used 75 ferrosilicon inoculation treatment in our country can not meet the requirements because of its rapid recession, large white mouth sensitivity, poor cross-section uniformity and bad metamorphic effect. To this end, we combine the production of high grade gray cast iron with several highly effective inoculants such as barium, strontium and zirconium and cast more than 100 tons of castings. Barium-based inoculant has been put into operation, has achieved intrinsic quality, processing performance and surface conditions are more ideal results.