The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2014
Filed:
Apr. 13, 2012
Changmin Chun, Annandale, NJ (US);
David Samuel Deutsch, Flemington, NJ (US);
Vance A. Mccray, Oakton, VA (US);
James Edward Feather, Fairfax, VA (US);
Brenda Anne Raich, Annandale, NJ (US);
ChangMin Chun, Annandale, NJ (US);
David Samuel Deutsch, Flemington, NJ (US);
Vance A. McCray, Oakton, VA (US);
James Edward Feather, Fairfax, VA (US);
Brenda Anne Raich, Annandale, NJ (US);
ExxonMobil Research and Engineering Company, Annandale, NJ (US);
Abstract
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 stainless steels including chromium in the range of 15.0 to 26.0 wt. % based on the total weight of the stainless 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, wherein the oxide layer is substantially comprised of alumina, chromia, silica, mullite, spinels, or mixtures thereof.