Material selection for water-wall and superheater/reheater tubing for a heavy liquid fuel-fired supercritical boiler was performed based on hot corrosion testing. This was carried out at varying temperatures through simulated firing conditions using Saudi Aramco’s heavy liquid fuel on bare carbon steel carbon steel with Inconel 622 weld overlay and carbon steel with 50Cr-50Ni thermal spray coating for water wall tubing; and on ASME Code Case 2328 material (18Cr-9Ni-3Cu-Cb-N) stainless steel type 347HTB stainless steel type 310HCbN Inconel 617 Inconel 740 Incoloy 800H and Incoloy 803 for superheater/reheater tubing. Mg-based fuel additive an inhibitor of hot corrosion was also used in testing the superheater/reheater tubing. The results showed that carbon steel with Inconel 622 weld overlay and stainless steel type 310HCbN yielded the best performance for waterwall tubing and superheater/reheater tubing respectively. The application of a Mg-based fuel additive also showed great merit in suppressing corrosion in the superheater and reheater sections. This test program constitutes part of a feasibility study for the design and construction of supercritical boilers to enhance power generation in Saudi Arabia