为了适应大跃进的需要,克服原材料供应上的困难,如何利用碳、硅、锰低而硫、磷高的土铁来直接浇注铸件,是一个艰巨而光荣的任务。我厂职工在党的领导和厂长的亲自指挥下,发挥了冲天干劲,克服了重重困难,终于将土铁变成合格的灰口铁。为了攻破土铁关,我们组织了土铁铸造研究小组,通过分析研究,认为要使土铁变成灰口铸件,首先需要解决的问题是在熔炼过程中提高炉温,造大量碱性渣以去硫,并使冲天炉炉气呈还原气氛,以增碳、增硅、增锰。要增加炉温和造大量碱性渣就需要采用较高的热风温度,要炉气呈还原性需要 In order to meet the needs of the Great Leap Forward and overcome the difficulties in supplying raw materials, it is an arduous and glorious task to directly cast castings using soil iron with low carbon, silicon, manganese and sulfur and phosphorus contents. Under the direct leadership of the party leadership and director of the factory, the staff and workers of our factory have played a pioneering role in overcoming all kinds of difficulties and finally turned the soil iron into a qualified gray iron. In order to break the soil off, we organized a soil iron casting research group, through analysis and research, that make soil iron into gray castings, the first problem to be solved is to raise the temperature in the melting process, making a large amount of alkaline residue to Desulfurization, and the cupola furnace gas was restored atmosphere, to carbon, silicon, manganese. To increase the furnace temperature and make a large amount of alkaline slag on the need to use a higher hot air temperature, furnace gas was required to restore