Based on the purpose of developing a heat-resistant casting steel which its service temperature of 1200 ℃,by chemical composition designing,RE Medium Carbon Fe-Cr26-Ni13 heat-resistant casting steel and on this basis,three kinds of heat-resistant casting steel,such as 2wt Al%,4wt Al%,6wt Al%,were added separately,which were melt and cast in medium fequency induction furnace. The effects of Al addition on the microstructure and high temperature yield strength,high temperature compressive strength were resear...