HIGH PERFORMANCE FIRED HEATER TUBES

摘要

Fired heater tubes with improved resistance to corrosion and fouling suitable for use in thermal processing units of petroleum refineries and petrochemical plants are fabricated from a bulk alloy of an alumina-forming alloy which is capable of forming a stable oxide film on the surfaces of the tubes. The bulk alloy comprising about 3 wt. % to about 20 wt. % of Al, about 5 wt. % to about 30 wt. % Cr and at least one alloying component selected from Fe, Ni, Co, Si, Mn, B, C, N, P, Ga, Ge, As, In, Sn, Sb, Pb, Sc, La, Y, Ce, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Re, Ru, Rh, Ir, Pd, Pt, Cu, Ag, Au and mixtures of these components.

主权项

1. A fired heater tube having an inner surface and an outer surface formed from an alumina-forming bulk alloy comprising about 3 wt. % to about 20 wt. % of Al, about 5 wt. % to about 30 wt. % Cr and at least one element selected from the group consisting of Fe, Ni, Co, Si, Mn, B, C, N, P, Ga, Ge, As, In, Sn, Sb, Pb, Sc, La, Y, Ce, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Re, Ru, Rh, Ir, Pd, Pt, Cu, Ag, Au and mixtures thereof, the tube having a surface oxide layer on at least one of its alumina-forming bulk alloy surfaces, substantially comprised of alumina, chromia, silica, mullite, spinels, or mixtures thereof.