구상흑연주철(球狀黑鉛鑄鐵)의 내마모성(耐磨耗性)에 미치는 Sb첨가(添加)의 효과(效果)에 관한 연구(硏究)

A Study for the Effects of Sb Addition on the Wear Resistance of Ductile Cast Iron

It is very important to obtain wear resistant ductile iron by adding more economical alloying elements. In this study, 10 heat of Mg-treated ductile iron were made according to Sb content (0-0.1% Sb). Each melt was tasted to 30 ${\o}test$ bars in $CO_2$ mold under the same condition and inspected wear characteristics, mechanical properties and microstructures. The results obtained from this study are as follows; 1. It is confirmed that Sb should be a simple and useful additive for improving wear resistance in ductile iron. 2. Hardness of ferrite and pearlite is improved with increasing Sb amount in ductile iron. 3. For ductile iron, the recommended ladle addition of Sb amount is to 0.02-0.03%. 4. Sb has adverse influence on spheroidizing of graphite if the amount is over 0.04%.