The Performance Of Low-carbon Ductile Iron, With The Ball

In this paper,the structure, mechanic properties, treat technology and spheroidising of low carbon ductile cast iron are studied,The structure and different properties of four kind of low carbon ductile cast iron, including C%=1.2%, Si%=1.8%, C%=1.4%, Si%=2.0%, C%=1.8%, Si%=2.2%, C%=2.0%, Si%=2.4%,are analysised.The influence of elements in low carbon ductile cast iron and in Sx inoculant are analisised.As a result there are many much small graphite nodule in low carbon ductile cast iron which are inoculated by SX inoculantThe comprehensive mechanic properties of low carbon ductile cast iron are not less than the traditional spheroidal graphite iron.Their strength of extension can reach the level of QT700-2,but the cost of low carbon ductile cast iron is much low.The strength of extension of low carbon ductile cast iron can reach 750MPa in casting state, the impact ductility can reach 20J/cm2.The diameter of graphite nodule is 5-20 (am,the base body is consisted of pearlite -. a little ferrite and cementite, through the analysis of the strengther and ductiler ,we draw the conclusion that this is very important in reality, observing the graphite nodule in SEM and TEM, there are many spheroiding element and anti-spheroiding elements in the core and edge of graphite nodule, they form the oxides sulphide and nitride .we draw the conclusion that they may be the core of graphite nodule. At last we make an advocate to improve the properties of low carbon ductile cast iron.