Claims
- 1. 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.
- 2. The alloy defined in claim 1, wherein the microstructure further comprises one of chromium carbides, ferrite or austenite in the
- 3. The alloy defined in claim 1, wherein the matrix contains a 25-35 wt. % solid solution of chromium.
- 4. The alloy defined in claim 1 comprising in wt. %:
- 3- 40chromium
- 1.9-2.1 carbon
- 1-2 manganese
- 0.5-1.5 silicon
- 1-2 molybdenum
- 1-5 nickel
- 1-2 copper.
- 5. The alloy defined in claim 2 comprising in wt. %:
- 36-40 chromium
- 1.9-2.1 carbon
- 1-2 manganese
- 0.5-1.5 silicon
- 1-2 molybdenum
- 1-5 nickel
- 1-2 copper.
- 6. The alloy defined in claim 3 comprising in wt. %:
- 36-40 chromium
- 1.9-2.1 carbon
- 1-2 manganese
- 0.5-1.5 silicon
- 1-2 molybdenum
- 1-5 nickel
- 1-2 copper.
- 7. 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.
- 8. The method defined in claim 7, wherein the microstructure of the alloy further comprises one of primary chromium carbides, primary ferrite or primary austenite in the matrix.
- 9. The method defined in claim 7, wherein the alloy matrix contains a 25-35 wt. % solid solution of chromium.
- 10. The method defined in claim 7, wherein the alloy comprises in wt. %:
- 36-40 chromium
- 1.9-2.1 carbon
- 1-2 manganese
- 0.5-1.5 silicon
- 1-2 molybdenum
- 1-5 nickel
- 1-2 copper.
- 11. The method defined in claim 8, wherein the alloy comprises in wt. %:
- 36-40 chromium
- 1.9-2.1 carbon
- 1-2 manganese
- 0.5-1.5 silicon
- 1-2 molybdenum
- 1-5 nickel
- 1-2 copper.
- 12. The method defined in claim 9, wherein the alloy comprises in wt. %:
- 36-40 chromium
- 1.9-2.1 carbon
- - 2manganese
- 0.5-1.5 silicon
- 1-2 molybdenum
- 1-5 nickel
- 1-2 copper.
Priority Claims (1)
Number |
Date |
Country |
Kind |
PJ5628 |
Aug 1989 |
AUX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/671,885, filed Apr. 3, 1991, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (7)
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Date |
Country |
63734 |
Mar 1967 |
AUX |
12869 |
Apr 1968 |
AUX |
14453 |
Apr 1970 |
AUX |
43163 |
Jun 1972 |
AUX |
220006 |
Dec 1923 |
GBX |
362375 |
Nov 1931 |
GBX |
401644 |
Dec 1933 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Derwent Abstract, Week W1, Class M27, SU 414326 (Dolbenko) Jul. 19, 1974. |
Derwent Abstract Accession No. 61284X/32, Class M27, SU 489808 Feb. 4, 1976. |
Continuations (1)
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Number |
Date |
Country |
Parent |
671885 |
Apr 1991 |
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