A Study on the Graphitization and Scaling Resistance property of High Al-Cast Iron

고(高)알루미늄 내열주철(耐熱鑄鐵)에서의 흑연구상화(黑鉛球狀化)와 내산화성(耐酸化性)에 관한 연구(硏究)

Graphite spheroidization and scaling resistance of cast iron containing 5-10% Al were investigated. It is impossible to obtain spheroidal graphite in cast iron containing Al with 8 % and over, but possible to obtain spheroidal graphite even in cast iron with an Al content of about 10 % by increasing Si content. In the scaling test carried out under the heating condition of $950^{\circ}C$ in air for total of 50 hours, the scaling resistance of cast iron containing Al with 8 % and over was remarkably superior, and also spheroidal graphite cast iron was superior to flake graphite cast iron. The scale became thinner more compacts and more protective with increasing Al content.