US3850618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demolybdenum refining method of molybdenum containing alloy steel material
Assignee: Individual
•
Filing: 1973-03-19
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Granted: 1974-11-26
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Expires: 1993-03-19
Abstract
Abstract A Mo reduction method of refining a melt of Mo alloy steel that includes Cr, Si, C, P and Mn comprises the steps of effecting oxidation of the molten steel to arrange that Cr is below 1%, and Si, C, P and Mn are below 0.1 percent respectively, arranging to contain oxygen above 0.02 percent in the molten steel, oxidizing Mo in the molten steel to produce Mo oxide by charging or blowing oxide of the alkali metal or alkali earth metal or salts of those metals and solid oxide (solid bond oxygen) or oxygen containing gas into the molten steel, and shifting the double salt formed by the Mo oxide and the oxide of the alkali metal or alkali earth metal into the slag.
Inventors
- 👤 T Seya
- 👤 K Naguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:01
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A MOLYBDENUM REDUCTION METHOD OF REFINING A MELT OF MOLYBDENUM ALLOY STEEL THAT INCLUDES CHROMIUM, SILICON, CARBON, PHOSPHORUS AND MAGANESE COMPRISING THE FOLLOWING STEPS: EFFECTING OXIDATION OF SAID MOLTEN STEEL WHEREBY CHROMIUM IS OXIDIZE BELOW 1 PERCENT AND SILICN, CARBON, PHOSPHORUS AND MANGANESE ARE OXIDIZE BELOW 0.1 PERCENT AND SAID MOLTEN STEEL CONTAINS MORE THAN 0.02 PERCENT OF OXYGEN; EFFECTING INTRODICTION OF A CHARGINGMATERIAL OF A STREAM OF AN OXIDIZING GAS RICH IN OXYGEN AND AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN OXIDE OF AN ALKALI METAL, ALKALI EARTH METAL AND SALTS OF SAID ALKALI METAL AND ALKALI METAL TO PRODUCE AN OXIDE OF MOLYBDENUM; AND EFFECTING THE TRANSFER OF SAID OXIDE OF THE ALKALI METAL AND ALKALI EARTH METAL AND THE FORMED DOUBLE SALT OF THE OXIDE OF MOLYBDENUM FROM THE MOLTEN BATH.
Claim 2
Dependent Claim
138 words
A MOLYBDENUM REDUCTION METHOD OF REFINING A MELT OF MOLYBDENUM ALLOY STEEL THAT INCLUDES CHROMIUM, SILICON, CARBON, PHOSPHORUS AND MAGANESE COMPRISING THE FOLLOWING STEPS: EFFECTING OXIDATION OF SAID MOLTEN STEEL WHEREBY CHROMIUM IS OXIDIZE BELOW 1 PERCENT AND SILICN, CARBON, PHOSPHORUS AND MANGANESE ARE OXIDIZE BELOW 0.1 PERCENT AND SAID MOLTEN STEEL CONTAINS MORE THAN 0.02 PERCENT OF OXYGEN; EFFECTING INTRODICTION OF A CHARGINGMATERIAL OF A STREAM OF AN OXIDIZING GAS RICH IN OXYGEN AND AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN OXIDE OF AN ALKALI METAL, ALKALI EARTH METAL AND SALTS OF SAID ALKALI METAL AND ALKALI METAL TO PRODUCE AN OXIDE OF MOLYBDENUM; AND EFFECTING THE TRANSFER OF SAID OXIDE OF THE ALKALI METAL AND ALKALI EARTH METAL AND THE FORMED DOUBLE SALT OF THE OXIDE OF MOLYBDENUM FROM THE MOLTEN BATH.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, in which the oxygen in said oxidizing gas is at least 0.02 percent.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 1, wherein said oxidizing gas includes a nitrogen gas.
Claim 5
Dependent Claim
32 words
A method as claimed in claim 1, wherein said oxygen containing gas stream is blown into said molten steel in a separate and distinct step from the charging of the selected compound.
Claim 6
Dependent Claim
21 words
A method as claimed in claim 1, in which the alkali earth metal group includes BeMoO4, MgMoO4, CaMoO4, SrMoO4, and BaMoO4.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 1, in which the alkali metal group includes Li2MoO4, Na2MoO4, Na2O33MoO3, Na20.5MoO3, K3MoO4, K20.2Na2O3, MoO3, Cs2MoO4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |