V Javaheri - Department of Material Engineering, Iran University of Industries and Mines, Tehran, Iran
M Tamizifar - Department of Material Engineering, Iran University of Science and Technology
F Shahri
M Mohammadnejad - Department of Material Engineering, Isfahan University of Technology, Isfahan, Iran

Cast heat-resistant HH stainless steels are particularly suitable for application where service conditions comprise high temperature; thus, they are extensively used in metallurgical furnace. The demand for better performance has motivated developments in these steel. In this work Ti and Nb was added to cast HH steel simultaneously. It was observed that its presence increased the level of fragmentation of the chromium carbides, a positive aspect for mechanical properties. Microstructures and mechanical properties confirmed that G phase transformation depend on Nb/Ti ratio, %W, in HHmodified with Nb and Ti.

Heat resistant Steel, Chromium Carbide, G-Phase, Niobium, Titanium