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夹渣是球铁生产中常见的缺陷。我厂生产的泥浆泵缸套其尺寸为φ204～235×360～425,壁厚28～38毫米,因该件产生的二次氧化渣浮不到铸件顶面,故往往在铸件中间形成夹渣缺陷,有时夹渣缺陷占废品率的80％以上。根据国内外经验,以全部铁水球化处理与包面孕育联用,代替原来的二次出铁水处理,能有效地消除球铁缸套的夹渣缺陷。这是因为,原来用的二次冲入法,第二次冲入的铁水中硫、氧过高,常与包内铁水中的各元素反应并生成比重小、粘度大的氧化
Slag is a common defect in ductile iron production. I plant the production of mud pump liner its size φ204 ~ 235 × 360 ~ 425, wall thickness 28 ~ 38 mm, because the pieces of secondary oxidation residue floating to the top of the casting, it is often formed in the middle of casting slag Defects, sometimes slag defects accounted for more than 80% of the rejection rate. According to the experience both at home and abroad, all the hot metal spheroidization treatment combined with the cover generation instead of the original secondary hot metal treatment can effectively eliminate the slag inclusion defects of the ductile iron cylinder liner. This is because the original secondary injection method, the second influx of molten iron in the sulfur, oxygen is too high, often with the package of molten iron in the reaction of the elements and generate a small proportion of high viscosity oxidation