US4129439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining molten steel using ferroalloy
Assignee: Nippon Steel Corp
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Filing: 1976-09-30
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Granted: 1978-12-12
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Expires: 1996-09-30
Abstract
Abstract Disclosed is a ferroalloy for refining molten steel, composed of, by weight, 5 to 40% Si, 40 to 80% Mn, 1 to 10% Al, and the remainder of Fe with inevitable amounts of impurities. The ferroalloy is suitable for use in deoxidizing molten steel and adjusting the composition thereof.
Inventors
- 👤 Hajime Nashiwa
- 👤 Susumu Tsuzita
- 👤 Tsutomu Nagahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:22
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/06; C22; C22C; C22C35/00; C22C35/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
In a process for the manufacture of steel composed of 0.12 to 0.20% C, 0.20 to 0.50% Si, 1.20 to 1.60% Mn, 0.02 to 0.05% Al and the remainder Fe, the improvement in which a ferroalloy consisting essentially of 13 to 16% Si, 55 to 63 Mn, 4 to 6% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.03 to 0.12% C, 0.10 to 0.25% Mn and the balance of Fe, in an amount of 17 to 22 kg of said ferroalloy per ton of said molten steel so as to deoxidize increase the yield and homogeneity of aluminium addition and said steel and adjust the composition thereof.
Claim 2
Dependent Claim
117 words
In a process for the manufacture of steel composed of 0.12 to 0.20% C, 0.20 to 0.50% Si, 1.20 to 1.60% Mn, 0.02 to 0.05% Al and the remainder Fe, the improvement in which a ferroalloy consisting essentially of 13 to 16% Si, 55 to 63 Mn, 4 to 6% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.03 to 0.12% C, 0.10 to 0.25% Mn and the balance of Fe, in an amount of 17 to 22 kg of said ferroalloy per ton of said molten steel so as to deoxidize increase the yield and homogeneity of aluminium addition and said steel and adjust the composition thereof.
Claim 3
Dependent Claim
118 words
In a process for the manufacture of steel composed of 0.20 to 0.38% C, 0.20 to 0.35% Si, 1.20 to 1.80% Mn, 0.01 to 0.05% Al and the remainder of Fe, the improvement in which a ferroalloy consisting essentially of 13 to 16% Si, 55 to 63% Mn, 4 to 6% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.12 to 0.25% C, 0.20 to 0.32% Mn and the balance of Fe in an amount of 17 to 22 kg of said ferroalloy per ton of said molten steel so as to increase the yield and homogeneity of aluminium addition and deoxidize said steel and adjust the composition thereof.
Claim 4
Dependent Claim
118 words
In a process for the manufacture of steel composed of 0.20 to 0.38% C, 0.20 to 0.35% Si, 1.20 to 1.80% Mn, 0.01 to 0.05% Al and the remainder of Fe, the improvement in which a ferroalloy consisting essentially of 13 to 16% Si, 55 to 63% Mn, 4 to 6% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.12 to 0.25% C, 0.20 to 0.32% Mn and the balance of Fe in an amount of 17 to 22 kg of said ferroalloy per ton of said molten steel so as to increase the yield and homogeneity of aluminium addition and deoxidize said steel and adjust the composition thereof.
Claim 5
Dependent Claim
109 words
In a process for the manufacture of steel composed of 0.40 to 0.60% C, 0.15 to 0.35% Si, 0.70 to 1.00% Mn, 0.01 to 0.05% Al and the remainder of Fe, the improvement in which a ferroalloy consisting essentially of 13 to 16% Si, 55 to 63% Mn, 4 to 6% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.30 to 0.50% C, 0.25 to 0.32% Mn and the balance of Fe in an amount of 7 to 10 kg of said ferroalloy per ton of said molten steel so as to deoxidize said steel and adjust the composition thereof.
Claim 6
Dependent Claim
109 words
In a process for the manufacture of steel composed of 0.40 to 0.60% C, 0.15 to 0.35% Si, 0.70 to 1.00% Mn, 0.01 to 0.05% Al and the remainder of Fe, the improvement in which a ferroalloy consisting essentially of 13 to 16% Si, 55 to 63% Mn, 4 to 6% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.30 to 0.50% C, 0.25 to 0.32% Mn and the balance of Fe in an amount of 7 to 10 kg of said ferroalloy per ton of said molten steel so as to deoxidize said steel and adjust the composition thereof.
Claim 7
Dependent Claim
118 words
In a process for the manufacture of steel composed of 0.10 to 0.18% C, 0.15 to 0.35% Si, 0.60 to 1.10% Mn, 0.01 to 0.05% Al and the remainder of Fe, the improvement in which a ferroalloy consisting essentially of 27 to 32% Si, 48 to 55% Mn, 8 to 10% Al, and the remainder of Fe, with inevitable amounts of impurities, is added to molten steel containing 0.07 to 0.17% C, 0.12 to 0.22% Mn and the balance of Fe, in an amount of 7 to 12 kg of said ferroalloy per ton of said molten steel so as to increase the yield and homogeneity of aluminium addition and deoxidize said steel and adjust the composition thereof.
Claim 8
Dependent Claim
118 words
In a process for the manufacture of steel composed of 0.10 to 0.18% C, 0.15 to 0.35% Si, 0.60 to 1.10% Mn, 0.01 to 0.05% Al and the remainder of Fe, the improvement in which a ferroalloy consisting essentially of 27 to 32% Si, 48 to 55% Mn, 8 to 10% Al, and the remainder of Fe, with inevitable amounts of impurities, is added to molten steel containing 0.07 to 0.17% C, 0.12 to 0.22% Mn and the balance of Fe, in an amount of 7 to 12 kg of said ferroalloy per ton of said molten steel so as to increase the yield and homogeneity of aluminium addition and deoxidize said steel and adjust the composition thereof.
Claim 9
Dependent Claim
118 words
In a process for the manufacture of steel composed of 0.10 to 0.24% C, 0.15 to 0.35% Si, 0.50 to 0.80% Mn, 0.01 to 0.05% Al, and the remainder of Fe, the improvement of which a ferroalloy consisting essentially of 27 to 32% Si, 48 to 55% Mn, 8 to 10% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.07 to 0.17% C, 0.12 to 0.22% Mn and the balance of Fe, in an amount of 7 to 12 kg of said ferroalloy per ton of said molten steel so as to increase the yield and homogeneity of aluminium addition and deoxidize said steel and adjust the composition thereof.
Claim 10
Dependent Claim
118 words
In a process for the manufacture of steel composed of 0.10 to 0.24% C, 0.15 to 0.35% Si, 0.50 to 0.80% Mn, 0.01 to 0.05% Al, and the remainder of Fe, the improvement of which a ferroalloy consisting essentially of 27 to 32% Si, 48 to 55% Mn, 8 to 10% Al, and the remainder of Fe with inevitable amounts of impurities, is added to molten steel containing 0.07 to 0.17% C, 0.12 to 0.22% Mn and the balance of Fe, in an amount of 7 to 12 kg of said ferroalloy per ton of said molten steel so as to increase the yield and homogeneity of aluminium addition and deoxidize said steel and adjust the composition thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |