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80年代初，宝钢首先从日本引进了一台大型烧结设备—450m2烧结机，其关键铸件为台车本体（图1），外形尺寸为5018X1486X440mm，壁厚20～60mm，浇注重量5．6t。由于台车本体工作条件恶劣，使用过程中容易变形和断裂。为此，日本采用了耐热球墨铸铁件，比我国传统铸钢件寿命要长?
In the early 1980s, Baosteel first imported a large-scale sinter-450m2 sintering machine from Japan. Its key castings are the body of the trolley (Figure 1). The overall dimensions are 5018X1486X440mm, wall thickness 20 ~ 60mm, and pouring weight 5.6t. Due to poor working conditions of the trolley body, easy to use the process of deformation and fracture. To this end, Japan adopted a heat-resistant ductile iron, cast steel than the traditional life expectancy longer?