RESEARCH ON PROMOTING THE FORMATION AND CLUSTERS OF TiN PHASE IN HIGH PURITY CAST IRON

As China is constantly striding forward from a large foundry country to a powerful one, the requirements of high purity cast iron for high-end castings have increased significantly and urgently. However, high purity cast iron produced by blast furnaces in China is always unable to meet national standard of high-end castings due to the exceeding of Ti. Based on the thermodynamic analysis, a detitanization method of increasing N in hot cast iron to promote the formation and clusters of TiN is proposed. High-temperature experiment has proved that N-addition can effectively promote the formation and clusters of TiN in hot cast iron, which provides the possibility for subsequent removal of Ti from high purity cast iron to meet the national standard.