Processes for producing low nitrogen essentially nitride-free chromium and chromium plus niobium-containing nickel-based alloys and the resulting chromium and nickel-based alloys
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United States of America Patent
Stats
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Sep 26, 2017
Grant Date -
May 5, 2016
app pub date -
Nov 5, 2014
filing date -
Nov 5, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Processes for producing low nitrogen, essentially nitride-free chromium or chromium plus niobium-containing nickel-based alloys include charging elements or compounds which do not dissolve appreciable amounts of nitrogen in the molten state to a refractory crucible within a vacuum induction furnace, melting said elements or compounds therein under reduced pressure, and effecting heterogeneous carbon-based bubble nucleation in a controlled manner. The processes also include, upon cessation of bubble formation, adding low nitrogen chromium or a low nitrogen chromium-containing master alloy with a nitrogen content of below 10 ppm to the melt, melting and distributing said added chromium or chromium-containing master alloy throughout the melt, bringing the resulting combined melt to a temperature and surrounding pressure to permit tapping, and tapping the resulting melt, directly or indirectly, to a metallic mold and allowing the melt to solidify and cool under reduced pressure.
First Claim
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International Classification(s)
- 2014 Application Filing Year
- C22B Class
- 297 Applications Filed
- 251 Patents Issued To-Date
- 84.52 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Mar 26, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Mar 26, 2029 |
