Alumina forming bimetallic tube for refinery process furnaces and method of making and using
US8808867B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2011 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Aug 14, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/714
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 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, wherein the oxide layer is substantially comprised of alumina, chromia, silica, mullite, spinels, or mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.