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US3833361A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for adding special elements to molten pig iron

Assignee: KUSAKA RARE METAL PROD CO Ltd
•
Filing: 1971-02-09
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Granted: 1974-09-03
•
Expires: 1991-02-09
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Abstract

Abstract A method of adding a magnesium containing additive selected from the group consisting of metallic magnesium and alloys or mixtures of magnesium with at least one other metal selected from the group consisting of rare earth metals, calcium, aluminum, vanadium, zirconium, niobium, titanium, copper, nickel, chromium, molybdenum, cobalt and mixtures thereof, which comprises introducing said magnesium containing additive to at least one enclosure at the bottom of a molten pig iron ladle, covering said additive with a granular or powdered covering layer containing at least one material selected from the group consisting of carbon, silicon carbide and silicon, whereby the melting point of said covering layer is adjusted to between 1,100* and 1,600* C. and thereafter pouring the molten pig iron into said layer over said enclosure so that contact between said molten pig iron and said additive is delayed until at least a portion of the covering layer is melted.

Inventors

  • 👤 T Kusaka

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 23:02
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10; C21C1/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 37 words
The method of claim 1, wherein said magnesium containing additive is admixed with a powdered or granular secondary additive containing at least one material selected from the group consisting of carbon, iron, iron-silicon, silicon carbide and silicon.
Claim 2
Dependent Claim 24 words
The method of claim 1, wherein said enclosures are in the form of one or more pockets formed on the bottom of said ladle.
Claim 3
Dependent Claim 24 words
The method of claim 1, wherein said enclosures are in the form of one or more recesses formed in the bottom of said ladle.
Claim 4
Dependent Claim 28 words
The method of claim 3, wherein said pockets are semicircular, circular or square in shape and wherein the walls of said pockets are composed of a refractory material.
Claim 5
Dependent Claim 26 words
The method of claim 1, wherein 0.2 to 1.0 percent by weight of said covering materials are used, based on the weight of the molten iron.
Claim 6
Dependent Claim 76 words
The method of claim 1, wherein said magnesium containing alloy consists essentially of 8 percent magnesium, 4 percent rare earth, 2 percent calcium, 45 percent silicon and the remainder iron, wherein said covering material is in the form of granules having sizes of from 3 mm. to 10 mm. and wherein the total quantity of said Mg containing additive is from 0.8 to 1.0 percent by weight based on the weight of the molten pig iron.

References Cited (Backward Citations)

US2688535A Cited
US2698749A Cited
US2766206A Cited
US2762705A Cited
US3017267A Cited
US3001869A Cited
US3328164A Cited
US3598575A Cited
US3642466A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-09-02 1978-03-04 1978-09-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-09-02 1982-03-04 1982-09-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-09-02 1986-03-04 1986-09-03 $7700.00 Window Closed / Lapsed

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