Patent ID: 8808867
Filing Date: 2014-08-19
Classification: B01J,B22F,B23K,B32B,C10G,C22C,C23C,F16L

Abstract:
1. A bimetallic tube for transport of hydrocarbon feedstocks through radiant coils of refinery process furnaces, comprising: i) an outer tube layer being formed from T9 steel; ii) an inner tube layer being formed from an alumina forming bulk alloy comprising 5.66 to 6.90 wt. % of Al, 20.7 to 22.10 wt. % Cr, 0.17 to 0.34 wt. % Si, and 36.3 to 41.55 wt. % Fe with a balance being Ni, wherein the inner tube layer is formed by plasma powder welding the alumina forming bulk alloy on an inner surface of the outer tube layer; and iii) an oxide layer formed on a surface of the inner tube layer, wherein the oxide layer comprises alumina.