中间形石墨铸铁的存在(在灰铁和球铁中发现的)早已为人们所知,珊瑚状石墨铸铁便是这样一种材料。以前的研究工作指出,生产这类铸铁,要求铁水中的含硫量极低(低于0.002%),这在本文中也得以证实。研究工作还证明,需要有较快的冷却速度,例如采用石墨型。但是如用锆处理铁水,就无须采用石墨型,珊瑚状石墨组织可采用砂型铸造获得。虽然这类铸铁的延伸率比较低,但它的抗拉强度却接近于球铁。企图通过添加珠光体稳定剂来提高铸件的抗拉强度是行不通的,因为珠光体稳定剂会促使形成片状石墨。本文研究了用低硫铁水生产伪片状石墨铸铁(译注:又称蠕虫状石墨铸铁)的其它改良形式的问题,添加0.013%的铈,可促使形成100%的伪片状石墨组织,由于添加的铈量少,它的回收率就高。伪片状石墨铸铁的机械性能近似于珊瑚状石墨铸铁,这两种材料的优缺点在本文中均有论述。 The presence of intermediate graphite cast iron, found in gray iron and ductile iron, has long been known and coral graphite cast iron is one such material. Previous studies have pointed out that the production of such cast iron requires a very low sulfur content (less than 0.002%) in the hot metal, as demonstrated in this paper. Research has also shown that faster cooling rates are required, such as graphite. However, as with zirconium molten iron, there is no need to use graphite, coral graphite can be obtained by sand casting. Although this type of cast iron elongation is relatively low, but its tensile strength is close to ductile iron. Attempts to increase the tensile strength of castings by adding pearlite stabilizers do not work because pearlite stabilizers promote the formation of flake graphite. In this paper, the authors studied the problem of producing other improved forms of pseudo-flake graphite cast iron with low-sulfur molten iron. The addition of 0.013% cerium promoted the formation of 100% pseudo-flake graphite structure, Less cerium, its recovery rate is high. The mechanical properties of pseudo-flake graphite cast iron are similar to those of coral-like graphite cast iron. The advantages and disadvantages of these two materials are discussed in this article.