US4313758A
Expired / Lapsed
US
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Method for adding unalloyed magnesium metal to molten cast iron
Assignee: Elkem Metals Co LP
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Filing: 1980-10-01
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Granted: 1982-02-02
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Expires: 2000-10-01
Abstract
Abstract Finely sized unalloyed magnesium metal is blended with finely sized ferrosilicon alloy. The blended mixture is placed in metal containers and plunged into molten cast iron.
Inventors
- 👤 William A. Henning
- 👤 Henry F. Linebarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:12
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A method for adding magnesium to a molten base iron which comprises preparing a blended mixture consisting essentially of unalloyed magnesium metal suitably sized about 1/4" and finer with ferrosilicon base alloy suitably sized to 3/8" and finer; placing blended mixture in a suitable container; and plunging said container beneath molten base iron, the amount of unalloyed magnesium metal in said mixture being from about 4% to 40% by weight of the weight of said ferrosilicon base alloy and unalloyed magnesium.
Claim 2
Independent Claim
81 words
A method for adding magnesium to a molten base iron which comprises preparing a blended mixture consisting essentially of unalloyed magnesium metal suitably sized about 1/4" and finer with ferrosilicon base alloy suitably sized to 3/8" and finer; placing blended mixture in a suitable container; and plunging said container beneath molten base iron, the amount of unalloyed magnesium metal in said mixture being from about 4% to 40% by weight of the weight of said ferrosilicon base alloy and unalloyed magnesium.
Claim 3
Dependent Claim
21 words
A method in accordance with claim 1 wherein the amount of unalloyed magnesium is from about 4 to 25% by weight.
Claim 4
Dependent Claim
31 words
A method in accordance with claim 1 wherein said unalloyed magnesium is sized from about 8 to 100 mesh and said ferrosilicon base alloy is sized from 8 to 200 mesh.
Claim 5
Dependent Claim
25 words
A method in accordance with claim 1 wherein the ferrosilicon base alloy is a magnesium ferrosilicon containing from 3-12% magnesium and 0.1 to 2.5% cerium.
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) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |