Gray cast iron has the characteristics of low cost, good casting performance and shock absorption, The key to the further development of gray cast iron lies in how to further improve its strength. Changing the of gray cast iron under certain process conditions has become an important means to improve the mechanical properties of gray cast iron. Scholars at home and abroad have done a lot of research on the influence of silicon carbon ratio of gray cast iron. However, what should be the silicon carbon ratio, Some studies believe that the higher the silicon carbon ratio, the better. Other data believe that the use of silicon carbon ratio has an optimal application range, that is, the silicon carbon ratio has the highest strength within the “range”, while some scholars find that the strength is very poor when the silicon carbon ratio is about in thick and large parts.
In recent years, many studies have paid attention to other influencing factors of gray cast iron, especially the re understanding of the influence of sulfur and manganese, such as the problem of low sulfur and large tendency of white cast iron, made some research on the substrate effect of sulfide, made productive tests on the influence of sulfur, and proposed amendments to the neutralization formula of manganese and sulfur.
However, neither the research on the ratio of silicon to carbon nor the re understanding of the influence of manganese and sulfur has remained on the basis of separate research so far, while there are few studies on the comprehensive influence of manganese, sulfur and ratio of silicon to carbon on the mechanical properties of gray cast iron. The reason is that the means to analyze the mechanism of this influence are limited. However, the influence of ratio of silicon to carbon, ratio of manganese to sulfur and carbon equivalent on the mechanical properties of gray cast iron After all, the influence of gray iron properties has a role of mutual restriction and promotion. Comprehensively considering the influence of these factors on the mechanical properties of gray cast iron will be conducive to the further understanding and development of gray cast iron.
Based on the above assumption, based on the research results on the influence mechanism of silicon carbon ratio of gray cast iron at home and abroad in recent years, the effects of silicon carbon ratio and manganese sulfur ratio in gray cast iron are further discussed by means of orthogonal test and analysis of variance. On this basis, the mathematical model of this influence is explored to predict the best composition of high-strength cast iron.