ALUMINA FORMING BIMETALLIC TUBE FOR REFINERY PROCESS FURNACES AND METHOD OF MAKING AND USING

• Main Authors: MCCRAY, VANCE, A, DEUTSCH, DAVID, SAMUEL, CHUN, CHANGMIN, FEATHER, JAMES, E
• Format: Patent
• Language: English; French
• Published: 26.04.2012
• Subjects: BLASTING; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CRACKING HYDROCARBON OILS; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; ENGINEERING ELEMENTS AND UNITS; FUELS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; LUBRICANTS; MACHINE TOOLS; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; MINERAL WAXES; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PIPES; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; PUNCHING METAL; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; SOLDERING OR UNSOLDERING; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WELDING; WORKING BY LASER BEAM; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

Provided is a bimetallic tube for transport of hydrocarbon feedstocks in refinery process furnaces, and more particularly in furnace radiant coils, including: i) an outer tube layer being formed from carbon steels or low chromium steels comprising less than 15.0 wt.% Cr based on the total weight of the steel; ii) an inner tube layer being formed from- an alumina forming bulk alloy including 5.0 to 10.0 wt.% of Al, 20.0 wt.% to 25.0 wt.% Cr, less than 0.4 wt.% Si, and at least 35.0 wt.% Fe with the balance being Ni, wherein the inner tube layer is formed plasma powder welding the alumina forming bulk alloy on the inner surface of the outer tube layer; and iii) an oxide layer formed on the surface of the inner tube layer. Cette invention concerne un tube bimétallique pour le transport des charges d'hydrocarbures dans des fours de raffinerie, et plus particulièrement, dans des serpentins radiants de fours, comprenant : i) une couche extérieure formée à partir d'aciers au carbone ou d'aciers à faible teneur en chrome comprenant moins de 15,0 % en poids de Cr, par rapport au poids total de l'acier; ii) une couche intérieure formée à partir d'un alliage aluminoformeur massif comprenant de 5,0 à 10,0 % en poids d'Al, de 20,0 à 25,0 % en poids de Cr, moins de 0,4 % en poids de Si, et au moins 35,0 % en poids de Fe, le reste étant du Ni, la couche intérieure du tube étant formée au moyen d'un soudage plasma-poudre de l'alliage aluminoformeur massif sur la surface intérieure de la couche extérieure du tube; et iii) une couche d'oxyde formée sur la surface de la couche intérieure du tube.