Ferrochromium alloy and method thereof
AssigneeWarman International Limited
InventorKevin F. Dolman
Life of this patent
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Abstract
An erosion and corrosion resistant ferrochromium alloy comprising the following composition, in wt. %, 34-50 chromium, 1.5-2.5 carbon, up to 5 manganese, up to 5 silicon, up to 5 molybdenum, up to 10 nickel, up to 5 copper, up to 1% of each of one or more micro-alloying elements selected from the group consisting of titanium, zirconium, niobium, boron, vanadium and tungsten, and balance, iron and incidental impurities. The alloy has a microstructure comprising eutectic chromium carbides in a matrix comprising one or more of ferrite, retained austenite and martensite, as herein defined. Optionally, the microstructure further comprises one of primary chromium carbides, primary ferrite or primary austenite in the matrix.
Claims12
An erosion and corrosion resistant ferrochromium alloy comprising the following composition, in wt. %.
- 34-50 chromium
- 1.5-2.3 carbon
- up to 5 manganese
- up to 5 silicon
- up to 5 molybdenum
- up to 10 nickel
- up to 5 copper
- up to 1% of each of one or more micro-alloying elements selected from the group consisting of titanium, zirconium, niobium, boron, vanadium and tungsten, and
- balance, iron and incidental impurities, with a microstructure comprising eutectic chromium carbides in a matrix comprising one or more of ferrite, retained austenite and martensite, as herein defined.
A method of producing an erosion and corrosion resistant ferrochromium alloy comprising the following composition, in wt. %,
- 34-50 chromium
- 1.5-2.3 carbon
- up to 5 manganese
- up to 5 silicon
- up to 5 molybdenum
- up to 10 nickel
- up to 5 copper
- up to 1% of each of one or more micro-alloying elements selected from the group consisting of titanium, zirconium, niobium, boron, vanadium and tungsten, and
- balance, iron and incidental impurities, with a microstructure comprising eutectic chromium carbides in a matrix comprising one or more of ferrite, retained austenite and martensite, as herein defined,
- the method comprising heat treating the alloy at a temperature in the range of 600.degree.-1000.degree. C., and air cooling the alloy.
Dependencies are inferred from the claim text.