Steel compositions having improved anti-coking properties
AssigneeVallourec Tubes France
InventorsValentin Rossi, Fernando Andres Bonilla Angulo, Nicolas Dulcy
Life of this patent
Estimating the term…
Abstract
Special usage steels, particularly those intended to be in contact with combustion fumes, are described. Tubular components produced based on such steels are also described. The steel both is resistant to the coking phenomenon and has improved mechanical performances. The steel contains in percentage by weight from 0.08 to 0.15% carbon, from 0.4 to 0.8% manganese, from 1.5 to 2.5% silicon, from 0.5 to 2% copper, from 8 to 10% chrome, from 0.5 to 3% nickel, from 0.01 to 0.07% nitrogen, from 0.8 to 1.1% molybdenum, with the remainder being iron and impurities.
Claims11
A tubular component adapted for use in furnace environments having temperatures of at least 600° C., the tubular component comprising a steel having a composition in percentage by weight:
- from 0.08 to 0.15% carbon,
- from 0.4 to 0.8% manganese,
- from 1.98 to 2.5% silicon,
- from 0.5 to 2% copper,
- from 8 to 10% chrome,
- from 0.5 to 3% nickel,
- from 0.01 to 0.07% nitrogen,
- from 0.8 to 1.1% molybdenum, and
- the remainder of the composition being iron and impurities, wherein the tubular component has a minimum average impact energy of 40 J in a longitudinal direction at 20° C.
Dependencies are inferred from the claim text.