自从去年全民大办钢铁以来,各地生产了大量土铁。这些土铁在我国社会主义建设中起了巨大的作用,現在已经成为铸造原料中的一支生力軍。土铁有土铁的特点,沒有掌握这些特点以前,必然会遇到許多困难。前一阶段,各地在使土铁变灰口方面作了很多工作,也交流了不少經驗,这些都为更好地利用土铁鋪平了道路。但是,土铁的鑄造性能却还掌握得不够,許多工厂废品率还相当高,大家都觉得土铁特別容易发生縮孔、縮松、气孔、夹砂及裂紋等缺陷。因此,广泛交流这方面的经驗就十分必要了。这里,打算简单讲一讲土铁的主要特性,并介紹一点工厂現場經验,供铸造工人同志参考。 Since last year, the People’s Daily became a major steel producer, a large number of soil iron products have been produced all over the country. These earth irons have played a huge role in the socialist construction in our country and have now become a new force in casting raw materials. Soil iron has the characteristics of earth iron, do not have these characteristics before, will inevitably encounter many difficulties. In the previous stage, a great deal of work was done by the local authorities in turning the soil iron into a gray mouth. Many experiences were also exchanged, all of which paved the way for better utilization of soil and iron. However, the soil cast iron casting performance is still not enough, many factory scrap rate is still very high, we all feel soil iron is particularly prone to shrinkage, shrinkage, porosity, sand and cracks and other defects. Therefore, extensive exchange of experience in this area is very necessary. Here, I intend to give a brief account of the main features of the soil railway and introduce a little factory field experience for the reference of the foundry workers.