Patent ID: 8201619

Claim:
A heat transfer component for heating a process stream, comprising: a housing having a wall forming a hollow interior, wherein the wall having an inner surface; at least one heat transfer element located within the housing for heating the process stream within the hollow interior of the housing; wherein at least one of the inner surface and the at least one heat transfer element having a surface roughness of less than 40 micro inches (1.1 μm), wherein of the at least one heat transfer element being formed from a steel composition that is resistant to sulfidation corrosion and corrosion induced fouling, wherein the steel composition comprising: X, Y, and Z, wherein X is a metal selected from the group consisting of Fe, Ni, Co and mixtures thereof, wherein is Y is Cr, and wherein Z is at least one alloying element selected from the group consisting of Si, Al, Mn, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Sc, Y, La, Ce, Pt, Cu, Ag, Au, Ru, Rh, Ir, Ga, In, Ge, Sn, Pb, B, C, N, O, P, and S, each of the at least one heat transfer element having Cr-enriched layer formed thereon, wherein the Cr-enriched layer also being formed from the steel composition X, Y and Z, wherein the ratio of Y to X in the Cr-enriched layer being greater than the ratio of Y to X in the remaining portion of the heat transfer element, wherein the surface roughness of the Cr-enriched layer is less than 40 micro inches (1.1 μm), and a protective layer formed on an outer surface of the Cr-enriched layer, wherein the protective layer comprises an oxide selected from the group consisting of a magnetite, an iron-chromium spinel, a chromium oxide, and mixtures thereof.