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以前,我们生产球铁一直采用二次冲入法。合金的加入量为1.8～2.0％。球铁件的皮下气孔、氧化皮,夹渣等缺陷比较多,有时也发生球化不良等现象,甚至出现灰口。究其原因,主要是第一次放铁水的数量控制不准,合金反应过快,镁烧损严重等,致使处理后的球铁质量不稳定。为此需要寻求一种稳定生产球铁的工艺和方法。 经过逐步改进,采用一次法处理球铁工艺,可使球化质量稳定,减轻皮下气孔、夹渣等缺陷的出现,而且降低了合金的加入量。
In the past, we used ductile method to produce ductile iron. Alloy added in an amount of 1.8 to 2.0%. Ductile iron ductile iron, oxide skin, slag and other defects are more, and sometimes the phenomenon of bad ball, and even gray mouth. The reason, mainly for the first time the amount of molten iron is not allowed to control the amount of alloy reaction too fast, serious loss of magnesium, resulting in the quality of iron after treatment is not stable. To this end, we need to seek a stable process and method of producing ductile iron. After a gradual improvement, using a one-time treatment of ductile iron process, the quality of the ball can be stabilized, reducing subcutaneous pores, inclusions and other defects, but also reduces the amount of alloy added.