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我厂生产高硅耐酸铸铁(含Si 14.0～16.0%)已经十多年了,先后生产过耐酸泵、蒸溜塔顶、塔圈、管子等主要产品。但是因为该材质机械性质不良,即硬度高、质地脆、加工困难;在温度发生剧烈变化时会产生碎裂,铸造时由于吸气性强收缩大等特点,给制造工艺上带来了一系列的困难,致使铸件经常产生气孔、缩孔、疏松、夹渣和裂纹等铸造缺陷,产品质量一直处于不稳定状态。几年来,由于采取了相应措施,裂纹虽然减少了,但疏松与皮下气孔仍较严重,废品率一般在30%左右,影响了工程拖期,增加了企业产品成本。
I plant production of high-silicon acid-resistant cast iron (Si 14.0 ~ 16.0%) has been more than 10 years, has produced acid pump, steam tower top tower tower, pipe and other major products. However, because of poor mechanical properties of the material, that is, high hardness, texture crisp, difficult processing; in the event of dramatic changes in temperature will produce fragmentation, foundry due to strong suction contraction characteristics, to the manufacturing process has brought a series of Of the difficulties, resulting in castings often produce porosity, shrinkage, loose, slag and crack casting defects, product quality has been in an unstable state. In recent years, due to the corresponding measures, although the crack is reduced, loose and sub-stoma are still more serious. The reject rate is generally around 30%, which affects the project delay and increases the product cost of the enterprise.