Patent ID: 8286695
Filing Date: 2012-10-16
Classification: B32B,C10G,C22C,C23F,F28D,F28F,F28G,Y10T

Abstract:
1. A heat transfer component for heating a process stream, comprising: a heat transfer element for heating the process stream, wherein the heat transfer element is formed from a first material and has an inner diameter surface and an outer diameter surface; a sleeve which is formed of a steel composition that is resistant to sulfidation corrosion and corrosion induced fouling, comprising three materials, X, Y, and Z, where wherein the sleeve has (i) a first surface adapted to contact one of the inner diameter surface and the outer diameter surface of the heat transfer element and (ii) a second surface adapted to contact the process stream which surface has a surface roughness of less than 40 micro inches (1.1 μm), a Cr-enriched layer formed from the steel composition X, Y and Z, in which the ratio of Y to X in the Cr-enriched layer is greater than the ratio of Y to X in the remaining portion of the sleeve and a protective layer comprising an oxide layer, a sulfide layer, an oxy-sulfide layer or a combination thereof formed on a surface of the Cr-enriched layer.