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近年来,我厂铸造车间主要使用本省的地方生铁,这些生铁的特点是碳硅含量低、硫磷含量高,尤其我厂使用的镇江、苏州等地的生铁,磷的含量高达0.36～0.58%。目前,国内还没有找到在酸性炉内有效的脱磷措施,生产的铸件易出现“脆、裂、松”缺陷,铸件机械性能往往达不到产品设计要求。为了推广本省地方生铁的利用,自1980年以来,因地制宜,利用本省地方高磷生铁,生产中磷铸铁,提高了铸件的强度、硬度、耐磨性,消除了“脆、裂、松”倾向,废钢用量减少,产品质量稳定。主要着手解决: 1.控制碳当量,改变片状石墨的大小和
In recent years, our foundry mainly uses local pig iron in our province. These pig iron are characterized by low carbon and silicon content and high content of parathion. In particular, pig iron and phosphorus content in Zhenjiang and Suzhou of our factory are as high as 0.36 to 0.58% . At present, the effective dephosphorization measures in acid furnace have not been found in China, and the defects of “brittle, cracked and loose” are easily appeared in the castings produced. The mechanical properties of castings often fail to meet the product design requirements. In order to promote the utilization of local pig iron in our province, since mid-1960s, using local high-phosphorus pig iron to produce medium-phosphorus cast iron increased the strength, hardness and wear resistance of castings and eliminated the tendency of “brittle, cracked and loose” Scrap consumption reduced, product quality and stability. The main solution: 1. Control of carbon equivalent, change the size and shape of flake graphite