一、概述 我厂承制的纯碱工业设备碳化塔中的铸铁管,其主要特点是直径小(外径为φ50～φ63;内径为φ38～φ50),长度长(2055～3750毫米),壁薄(6～7毫米),承受水压1MPa,直线度要求高及两端均需加工或有凸台等。因此铸造难度大。 于1981年和1984年进行试验,克服了重重的困难,最后获得成功。现在已成批生产(图1)。 First, an overview of our factory soda ash soda ash industrial equipment in the carbonation tower of the cast iron pipe, which is characterized by small diameter (diameter φ50 ~ φ63; diameter φ38 ~ φ50), long length (2055 ~ 3750 mm) (6 ~ 7 mm), to withstand water pressure 1MPa, high straightness and both ends of the need to process or have bosses and so on. Therefore casting difficult. Experiments were conducted in 1981 and 1984, overcoming the difficulties and finally succeeding. Now mass production (Figure 1).