Alloying elements which don’t form carbides or intermetallic, they will be dissolved as a homogenous solid solution. Austenite and Ferrite have limited solubility for alloying elements. For example, Cu can be maximum dissolved in iron up to 7%, if it exceeds this percentage it will exist as metal inclusion. In the case of nitrogen, the maximum solubility limit is up to 0.015%, and the remaining nitrogen will exist as an inclusion or will form nitrides with other alloying elements like V, Al and Ti.