Evaluation model of susceptibility to Cu hot shortness of Cu-containing LC steel

Abstract

It is well known that copper causes the hot shortness problem when in the scrap based steelmaking process. Hot shortness occurs because of selective oxidation of the iron whereby the more noble copper is enriched at the steel-oxide interface and embrittlement take places during hot working. In this paper, in order to control the Cu hot shortness, the evaluation model of susceptibility to Cu hot shortness was investigated. We found that Cu hot shortness susceptibility is related to the oxidation rate, the copper equivalence and the scale-steel interface length ratio. Also, it is founded to exist a fairly nice correlation between the oxidation rate and other factors such as chemistry elements, oxidation conditions, especially the Ni content.