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EP0090654A2
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Alloy and process for producing ductile and compacted graphite cast irons
Assignee: Elkem Metals Co LP
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Filing: 1983-03-29
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Granted: —
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Expires: 2003-03-29
Abstract
Abstract The present invention is directed to an alloy composition, a method of making it and a method of treating molten cast iron with such alloy to produce ductile and compacted graphite cast iorns. The alloy may contain from 0.1 % to 10% silicon, from 0.05 to 2.0% cerium and/or other rare earth elements, from 0.5 to 4% magnesium, 0.5 to 6.5% carbon (percent by weight) the balance being iron.
Inventors
- 👤 Paul J. Bilek
- 👤 Richard A. Flinn
- 👤 Thomas K. Mccluhan
- 👤 Paul K. Trojan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:37
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/04; C21; C21C; C21C1/00; C21C1/10; C22C33/00; C22C33/08; C22C33/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
32 words
An iron alloycomprising by weight from 0.1 to 10.0% silicon, from 0.05 to 2.0% of one or more rare earth elements, from 0.5 to 4.0% magnesium, from 0.5 to 6.5% carbon,and iron.
Claim 2
Dependent Claim
32 words
An iron alloycomprising by weight from 0.1 to 10.0% silicon, from 0.05 to 2.0% of one or more rare earth elements, from 0.5 to 4.0% magnesium, from 0.5 to 6.5% carbon,and iron.
Claim 3
Dependent Claim
20 words
An alloy as claimed in CLaim 1 wherein the balance after silicon, rare earth elements, magnesium and carbon is iron.
Claim 4
Dependent Claim
39 words
An aLLoy as claimed in claim 1 or CLaim 2 being predominantly iron by weight and having by weight from 1.0 to 6.0% silicon, from 0.2 to 2.0% rare earth element or elements and from 0.9 to 2.0% magnesium.
Claim 5
Dependent Claim
20 words
An alloy as claimed in any of CLaims 1 to 3 wherein cerium is present as a rare earth element.
Claim 6
Dependent Claim
17 words
An aLLoy as claimed in CLaim 4 wherein cerium is the predominant rare earth element by weight.
Claim 7
Dependent Claim
18 words
An alloy as claimed in any of the preceding claims comprising by weight from 3.0 to 6.0% carbon.
Claim 8
Dependent Claim
18 words
An aLLoy as claimed in any of the preceding claims having density from 6.5 to 7.5 gms/cm. 3
Claim 9
Independent Claim
73 words
A method of making an alloy which comprises the steps of forming a molten iron bath comprising by weight from 0.1 to 10.0% silicon, from 0.05 to 2.0% one or more rare earth elements, from 0.5 to 4.0% magnesium, from 0.5 to 6.5% carbon and iron and maintaining said molten bath under superatmospheric pressure of an inert gas while reaction takes place and then rapidly solidifying the melt to form the iron alloy.
Claim 10
Independent Claim
73 words
A method of making an alloy which comprises the steps of forming a molten iron bath comprising by weight from 0.1 to 10.0% silicon, from 0.05 to 2.0% one or more rare earth elements, from 0.5 to 4.0% magnesium, from 0.5 to 6.5% carbon and iron and maintaining said molten bath under superatmospheric pressure of an inert gas while reaction takes place and then rapidly solidifying the melt to form the iron alloy.
Claim 11
Dependent Claim
57 words
A method as claimed in CLaim 8 which comprises maintaining the said molten bath under from 3515 to 5273 g/cm 2 gauge (50 to 75 p.s.i.g.) pressure of an inert gas while reaction takes place and adjusting the proportions of said metals to produce the iron aLLoy with density from about 6.5 to about 7.5 gms/cm. 3
Claim 12
Dependent Claim
34 words
A method as claimed in CLaim 8 or CLaim 9 wherein the components of the molten bath are present in amounts to produce an aLLoy as claimed in any of CLaims 2 to 7.
Claim 13
Independent Claim
43 words
A method of producing ductile or compacted graphite cast irons which comprises the step of introducing into the molten iron that contains carbon an iron alloy as claimed in any of CLaims 1 to increase the magnesium content of said treated molten iron.
Claim 14
Dependent Claim
43 words
A method as claimed in CLaim 11 in which the iron aloy is added to the molten iron in an amount sufficient to provide in the molten iron from 0.015% to about 0.08% magnesium based on the weight of the treated molten iron.
Claim 15
Dependent Claim
16 words
A ductile or compacted cast iorn produced by the method of CLaim 11 or CLaim 12.
References Cited (Backward Citations)
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