CA1070120A - Steelmaking process - Google Patents
Steelmaking processInfo
- Publication number
- CA1070120A CA1070120A CA239,319A CA239319A CA1070120A CA 1070120 A CA1070120 A CA 1070120A CA 239319 A CA239319 A CA 239319A CA 1070120 A CA1070120 A CA 1070120A
- Authority
- CA
- Canada
- Prior art keywords
- molten
- iron
- weight
- unmolten
- mix
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
ABSTRACT
Process for producing refined steel including the provision of molten iron, adding molten steel to said molten iron to provide a molten mix, adding iron bearing material in unmolten from to said mix, and refining the mixture by blowing essentially pure oxygen therethrough.
Process for producing refined steel including the provision of molten iron, adding molten steel to said molten iron to provide a molten mix, adding iron bearing material in unmolten from to said mix, and refining the mixture by blowing essentially pure oxygen therethrough.
Description
~7~L%C) , BACKGROUND OF THE INVENTION
It is known to melt solid materials bearing iron, such as scrap metal, with a flame produced by the combustion of a fuel and essentially pure oxygen. It has been found that the resultant product is of a steel making composition having a very low carbon content and is often highly oxidized. It is also known to add xeagents to the melt as it is discharged from the melter into a collection vessel.
It is further known to melt solid'materials bearing iron with an oxy-fuel flame and for continuous feeding of the melt to the receiving vessel of further refining means.
It is a purpose of the present invention to improve the efficiency of the above disclosed processes and to provide improved methods for controlling the oxygen and carbon contents of the melt from the oxy-fue,l flame melter.
This invention relates generally to a process for ; melting of iron or steel bearing material in which melting the charge ~ay be partly or entirely'scrap metal; the melt is then further treated in a number of different steps in a number of different apparatus having different functions.
In one aspect the invention provides a process for producing refined steel which comprises: providing a supply of molten iron bearing material, having a carbon content of at least 2%, by weight; adding, ko said molten iron, molten steel , having a carbon content less than 2~, by weight, to provide a molten mix; adding, to said molten mix, unmolten iron bearing material`in an amount where the unmolten material comprises . . .
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`approximately 5 - 15%, by weight, of the resultant mixture comprised of said molten mix and the added unmolten material; and blowing essentially pure oxygen through the resultant mixture to refine the same.
In another aspect the present invention provides a process for producing refined steel, comprising: (a) melting a supply of iron bearing material, in a melting chamber, said material being in solid form, with a reducing flame produced by the combustion oE fuel with essentially pure oxygen in a lower position of said chamber; (b) completing combustion of the reducing gases, resulting from said flame, by providing a supplementary source of combustion supporting gas at an elevated position of said chamber, in respect to said lower position; (c) adding the molten composition having a carbon content of at least 2%, by weight, resulting from step (a) to another iron bearing molten composition having a carbon content less than 2%, by weight, to produce a molten mix; (d) combining said molten mix with unmolten ferrous bearing material in an amount comprising approximately 5 - 15%, by weight of the resultant mixture and (e) refining the combination of step (d) by in~ecting essentially pure oxygen into the molten mix.
In a further aspect the present invention provides a process for the refining of steel-making composition, which comprises: (a) providing a supply of molten iron at a temperature oE about 2400F and having a composition comprising, in percent by weight:
.5 - 2.0 Silicon
It is known to melt solid materials bearing iron, such as scrap metal, with a flame produced by the combustion of a fuel and essentially pure oxygen. It has been found that the resultant product is of a steel making composition having a very low carbon content and is often highly oxidized. It is also known to add xeagents to the melt as it is discharged from the melter into a collection vessel.
It is further known to melt solid'materials bearing iron with an oxy-fuel flame and for continuous feeding of the melt to the receiving vessel of further refining means.
It is a purpose of the present invention to improve the efficiency of the above disclosed processes and to provide improved methods for controlling the oxygen and carbon contents of the melt from the oxy-fue,l flame melter.
This invention relates generally to a process for ; melting of iron or steel bearing material in which melting the charge ~ay be partly or entirely'scrap metal; the melt is then further treated in a number of different steps in a number of different apparatus having different functions.
In one aspect the invention provides a process for producing refined steel which comprises: providing a supply of molten iron bearing material, having a carbon content of at least 2%, by weight; adding, ko said molten iron, molten steel , having a carbon content less than 2~, by weight, to provide a molten mix; adding, to said molten mix, unmolten iron bearing material`in an amount where the unmolten material comprises . . .
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`approximately 5 - 15%, by weight, of the resultant mixture comprised of said molten mix and the added unmolten material; and blowing essentially pure oxygen through the resultant mixture to refine the same.
In another aspect the present invention provides a process for producing refined steel, comprising: (a) melting a supply of iron bearing material, in a melting chamber, said material being in solid form, with a reducing flame produced by the combustion oE fuel with essentially pure oxygen in a lower position of said chamber; (b) completing combustion of the reducing gases, resulting from said flame, by providing a supplementary source of combustion supporting gas at an elevated position of said chamber, in respect to said lower position; (c) adding the molten composition having a carbon content of at least 2%, by weight, resulting from step (a) to another iron bearing molten composition having a carbon content less than 2%, by weight, to produce a molten mix; (d) combining said molten mix with unmolten ferrous bearing material in an amount comprising approximately 5 - 15%, by weight of the resultant mixture and (e) refining the combination of step (d) by in~ecting essentially pure oxygen into the molten mix.
In a further aspect the present invention provides a process for the refining of steel-making composition, which comprises: (a) providing a supply of molten iron at a temperature oE about 2400F and having a composition comprising, in percent by weight:
.5 - 2.0 Silicon
2.0 min. Carbon .4 - 1.5 Manganese and the balance being essentially iron (b) adding to said molten iron, low carbon molten steel scrap to provide a - molten mixture being comprised of approximately 60% of ~J
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said molten scrap and approximately 40~ of said molten iron composition; said mixture being at a temperature of about 2600F
and being of a composition comprising:
.5 - .6 Silicon 2.0 Carbon .3 - .~ Manganese td) adding to said molten mixture unmolten iron bearing material ln an amount where said unmolten lron bearing material comprises approximately 5 - 15% of the resultant mixture; and (e) refining said resultant mixture by blowing oxygen therethrough with a nozzle having its discharge opening positioned beneath the surface of the molten charge.
The objects of this invention are attainable through the provision of method and means for oxy-fuel melting a charge of splid material, bearing iron, which melting produces a relatively low carbon containing composition; the low carbon composition is added to another molten composition of relatively higher carbon content, such as that produced by conventional blast furnace practice, to provide a molten mix; unmolten iron bearing material is added to said molten mix in a refining vessel having means for introducing essentially pure oxygen beneath the surface of the melt in said refining vessel.
; DESCRIPTION OF THE DR~WING
The single figure in the drawing is a schematic representation of the melting, mixing, and refining vessels used in conducting the basic steps comprising the process of this invention.
DESCRIPTION OF PREFERRED E~IBODIMENTS
In the drawing, there is disclosed method and means of the type which may be employed in the process of this invention for jl/7tr ~ -2a-' ' . :
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melting solid materials bearing iron, e.g. scrap metal. For convenience the melting apparatus is schematically illustrated and is generally designated by the numeral 10.
In a preferred embodiment, a plurality of oxy-fuel burners 12 are disposed about the melting vessel 10 and positioned to direct their flames at a bottom portion oE the feed charge ]llhi -2b-:
' .
7~12(~1 column 14. As portions of the bottom of column 14 are rendered molten, the melt flows toward and through a tap hole 16. Optionally, auxiliary heat may be directed at the tap hole 16 to deter "freezing" o~ the metal. Trough 18 is provided to direct the melt to positionable mixing vessel 20. The melting of the solid charge with oxy-fuel produces a melt which is of very low carbon content, generally less than 0.1%, and which is highly oxidized. For the purpose of definition in this patent application, a "low carbon" containing composition is considered to be one having less than 2% carbon, and a "high carbon" containing composition is one which includes at least 2% carbon. All % composition igures herein given are "by weight".
; Preferably, the low carbon composition melt from the malter 10 is directed to a mixing vessel 20 into which a high carbon molten composition - has been previously charged. Suitably, the high carbon melt may be blast fur-nace iron at a temperature generally around 2400 - 2500 F and having a typical composition comprising, by weight: .5 - 2.0% silicon; at least 2% carbon;
.40 - 1.5% manganese; and the balance being essentially iron. In a more preferred embodiment, the high carbon molten composition comprises: about 1~ eilicon, about 4% carbon, .5 - 1.0% manganese; and the balance essentially iron. Also preferably, a composite molten mix is provided which is compr sed of 40 - 75% low carbon composition and 60 - 25~ of the high carbon composition.
The mix will usually result in a composition being at a temperature of about 2600 F and comprising: .5 - .6% silicon; 1.8 - 2.0 carbon; .3 - .~ manganese;
and the balance essentially iron.
It is also preferred to provide agitating means for the mixing vessel 20 for stirring and enhancing intermixing of the "low carbon" and "high carbon" compositions. Such agitating means may be in any suitable form, mechanical, electrical, or by i .
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injection of a gaseous stream discharged below the surface of the molten mix through separate tuyeres 22.
By the addition of the low carbon composition from the melter to the high carbon composition (blast furnace iron) and the refinement of the res~lltant mix, it is expected that any QX-idized metal from the melter will be reduced by the carbon in the high carbon composition.
The molten composite mix metal is preferably charged, for ease in processing, to a separate refining vessel. However, it will be understood that the further refinement may be con~
ducted in the same vessel, where the mixing of the low carbon and the high carbon compositions takes place through the-provision of suitable means for introducing the refining medium.
The separate refining vessel~ referred to above, is desi~nated by the numeral 30 and is illustrated to be generally in the form of an open hearth t~pe furnace; h,owever, modified to omit the usual burners and/or oxygen lances employed in the typical open hearths. Instead, one o~ more tuyeres 32 are provided as refinement medium means for introducing a refinin~
gas, such as essentially pure ox~gen (at least 80%)~ beneath the surface of, into, and for refinement of the molten metal bath mix charged from mixing vessel 20.
- Alternatively, the refinement medium means may be incorporated in those refining vessels commonly referred to as "bottom" blown conyerters or to "side" blown converters~ As another alternative, as indicated above, the refinement medium means may be incorporated into the mixing vessel 20. It will be apparent from this disclosure that a single mixing vessel may be used to serYice more than one refining vessel.
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In a t~pical and preferred process, sufficient molten mix metal is provided to the vessel, where refining is to take place without the addition of more heat~ to constitute approximatel~
85 - 95% of the total anticipated work charge. The approximately remaining 5 - 15~ of the charge ma~ be advantageously comprised o cold unmolten scrap, and~or iron ore pellets, and/or other iron bearing materials in solid fo~m~ After the charge is com-pleted, refining is conducted by introducing substantially pure oxygen beneath the surface and blowing through the molten chargeO
Of ~ourse, if additional heat is provided~ such as b~ burners in the refining vessel, then the amount of unmolten scrap may be - increased.
It will be noted that the total "hot metal" (relatively high carbon content composition) imput to the refining vessel is in the order of 22 - 54%~ i.e., 25 to 60% total charge to mixing ~essel x 90% total charge to refining vessel. In con-trast, conventional open hearth and BOF practices utilize 55 -60% and 70% "hot metal"~ respectivel~
It is also anticipated that higher yields of usakle steel are attainable through the use of the introduction of the refining medium below the surface of the molten bath, as opposed to blowing unto the surface. One of the contributing factors is better utilization of the refining medium attained by virtue of the more intimate contact with the bath. Another factor is that there is less iron oxide emission loss than that encount-ered with the use of ox~gen lances and the resultant fumingO
The process of this invention provides several advan-tages in steel refinement as compared with conventional steel-making practices. Some of these advantages are:
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lo Improved yields of usable steel;
2. Unprepared scrap may be used;
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said molten scrap and approximately 40~ of said molten iron composition; said mixture being at a temperature of about 2600F
and being of a composition comprising:
.5 - .6 Silicon 2.0 Carbon .3 - .~ Manganese td) adding to said molten mixture unmolten iron bearing material ln an amount where said unmolten lron bearing material comprises approximately 5 - 15% of the resultant mixture; and (e) refining said resultant mixture by blowing oxygen therethrough with a nozzle having its discharge opening positioned beneath the surface of the molten charge.
The objects of this invention are attainable through the provision of method and means for oxy-fuel melting a charge of splid material, bearing iron, which melting produces a relatively low carbon containing composition; the low carbon composition is added to another molten composition of relatively higher carbon content, such as that produced by conventional blast furnace practice, to provide a molten mix; unmolten iron bearing material is added to said molten mix in a refining vessel having means for introducing essentially pure oxygen beneath the surface of the melt in said refining vessel.
; DESCRIPTION OF THE DR~WING
The single figure in the drawing is a schematic representation of the melting, mixing, and refining vessels used in conducting the basic steps comprising the process of this invention.
DESCRIPTION OF PREFERRED E~IBODIMENTS
In the drawing, there is disclosed method and means of the type which may be employed in the process of this invention for jl/7tr ~ -2a-' ' . :
~ C~7~
melting solid materials bearing iron, e.g. scrap metal. For convenience the melting apparatus is schematically illustrated and is generally designated by the numeral 10.
In a preferred embodiment, a plurality of oxy-fuel burners 12 are disposed about the melting vessel 10 and positioned to direct their flames at a bottom portion oE the feed charge ]llhi -2b-:
' .
7~12(~1 column 14. As portions of the bottom of column 14 are rendered molten, the melt flows toward and through a tap hole 16. Optionally, auxiliary heat may be directed at the tap hole 16 to deter "freezing" o~ the metal. Trough 18 is provided to direct the melt to positionable mixing vessel 20. The melting of the solid charge with oxy-fuel produces a melt which is of very low carbon content, generally less than 0.1%, and which is highly oxidized. For the purpose of definition in this patent application, a "low carbon" containing composition is considered to be one having less than 2% carbon, and a "high carbon" containing composition is one which includes at least 2% carbon. All % composition igures herein given are "by weight".
; Preferably, the low carbon composition melt from the malter 10 is directed to a mixing vessel 20 into which a high carbon molten composition - has been previously charged. Suitably, the high carbon melt may be blast fur-nace iron at a temperature generally around 2400 - 2500 F and having a typical composition comprising, by weight: .5 - 2.0% silicon; at least 2% carbon;
.40 - 1.5% manganese; and the balance being essentially iron. In a more preferred embodiment, the high carbon molten composition comprises: about 1~ eilicon, about 4% carbon, .5 - 1.0% manganese; and the balance essentially iron. Also preferably, a composite molten mix is provided which is compr sed of 40 - 75% low carbon composition and 60 - 25~ of the high carbon composition.
The mix will usually result in a composition being at a temperature of about 2600 F and comprising: .5 - .6% silicon; 1.8 - 2.0 carbon; .3 - .~ manganese;
and the balance essentially iron.
It is also preferred to provide agitating means for the mixing vessel 20 for stirring and enhancing intermixing of the "low carbon" and "high carbon" compositions. Such agitating means may be in any suitable form, mechanical, electrical, or by i .
: `
~ 3-rm~
D7~ZC~
injection of a gaseous stream discharged below the surface of the molten mix through separate tuyeres 22.
By the addition of the low carbon composition from the melter to the high carbon composition (blast furnace iron) and the refinement of the res~lltant mix, it is expected that any QX-idized metal from the melter will be reduced by the carbon in the high carbon composition.
The molten composite mix metal is preferably charged, for ease in processing, to a separate refining vessel. However, it will be understood that the further refinement may be con~
ducted in the same vessel, where the mixing of the low carbon and the high carbon compositions takes place through the-provision of suitable means for introducing the refining medium.
The separate refining vessel~ referred to above, is desi~nated by the numeral 30 and is illustrated to be generally in the form of an open hearth t~pe furnace; h,owever, modified to omit the usual burners and/or oxygen lances employed in the typical open hearths. Instead, one o~ more tuyeres 32 are provided as refinement medium means for introducing a refinin~
gas, such as essentially pure ox~gen (at least 80%)~ beneath the surface of, into, and for refinement of the molten metal bath mix charged from mixing vessel 20.
- Alternatively, the refinement medium means may be incorporated in those refining vessels commonly referred to as "bottom" blown conyerters or to "side" blown converters~ As another alternative, as indicated above, the refinement medium means may be incorporated into the mixing vessel 20. It will be apparent from this disclosure that a single mixing vessel may be used to serYice more than one refining vessel.
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In a t~pical and preferred process, sufficient molten mix metal is provided to the vessel, where refining is to take place without the addition of more heat~ to constitute approximatel~
85 - 95% of the total anticipated work charge. The approximately remaining 5 - 15~ of the charge ma~ be advantageously comprised o cold unmolten scrap, and~or iron ore pellets, and/or other iron bearing materials in solid fo~m~ After the charge is com-pleted, refining is conducted by introducing substantially pure oxygen beneath the surface and blowing through the molten chargeO
Of ~ourse, if additional heat is provided~ such as b~ burners in the refining vessel, then the amount of unmolten scrap may be - increased.
It will be noted that the total "hot metal" (relatively high carbon content composition) imput to the refining vessel is in the order of 22 - 54%~ i.e., 25 to 60% total charge to mixing ~essel x 90% total charge to refining vessel. In con-trast, conventional open hearth and BOF practices utilize 55 -60% and 70% "hot metal"~ respectivel~
It is also anticipated that higher yields of usakle steel are attainable through the use of the introduction of the refining medium below the surface of the molten bath, as opposed to blowing unto the surface. One of the contributing factors is better utilization of the refining medium attained by virtue of the more intimate contact with the bath. Another factor is that there is less iron oxide emission loss than that encount-ered with the use of ox~gen lances and the resultant fumingO
The process of this invention provides several advan-tages in steel refinement as compared with conventional steel-making practices. Some of these advantages are:
rm/~
~ ~7~Z~
lo Improved yields of usable steel;
2. Unprepared scrap may be used;
3. No additional heat imput required in the refining ; vessel or furnace;
4. The refining furnace charge may be comprised of as little as 22 - 54% hot metal (relatively high carbon content, e.g. blast furnace iron), in con-trast, 55 - 60% hot metal is required in conven-tional open hearth practice and 70% is required in conventional BOF practicei
5. Faster refining times are attainable through the introduction of refining oxygen beneath the surface and through the molten bath, i~e., the rate of oxygen that can be introduced is not limited to the extent as in the case of vertically supported oxygen lances in conyentional open hearths;
6. Higher fuel efficiencies are attainable, i.e~, 70%
or better, compared with usual 15~ in open hearth;
or better, compared with usual 15~ in open hearth;
7~ LmproYed ~essel roof life because of reduced dust emissions and decreased fuel consumption;
8. Flexibility of batch sizes which can be produced in refining vessel; and
9. Ease of process control through selectable adjust ment of oxygen injection in scrap melter and/or refining vessel.
~he present inYention proYides improye~ents in the melting practice as pre~iously known. In the melter of this in~ention, the burners are operated to provide a reducing fl~me, i.e., less oxygen .~s supplied directly to the burners than that xm~"
: :
` ' ~ ~7~20 required to provlde a stoichometric mixture. Such operation minimizes oxidation of the molten charge produced in the melter.
Also, supplementary combustion supporting gas supply means, illustrated in the form of nozzle 15, is provided. Air, oxygen enriched air, or additional essentially pure oxygen is introduced through the nozzle means 15, positioned at an elevated position in relation to the burner 12 and the work charge column 14.
The provision of such supplementary combustion supporting gas facilitates "burning" of the carbon monoxide, produced by the reducing flame of burner 12, and conversion to carbon dioxide for optimum fuel efficiency.
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~he present inYention proYides improye~ents in the melting practice as pre~iously known. In the melter of this in~ention, the burners are operated to provide a reducing fl~me, i.e., less oxygen .~s supplied directly to the burners than that xm~"
: :
` ' ~ ~7~20 required to provlde a stoichometric mixture. Such operation minimizes oxidation of the molten charge produced in the melter.
Also, supplementary combustion supporting gas supply means, illustrated in the form of nozzle 15, is provided. Air, oxygen enriched air, or additional essentially pure oxygen is introduced through the nozzle means 15, positioned at an elevated position in relation to the burner 12 and the work charge column 14.
The provision of such supplementary combustion supporting gas facilitates "burning" of the carbon monoxide, produced by the reducing flame of burner 12, and conversion to carbon dioxide for optimum fuel efficiency.
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Claims (8)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for producing refined steel which comprises:
(a) providing a supply of molten iron bearing material, having a carbon content of at least 2%, by weight;
(b) adding, to said molten iron, molten steel having a carbon content less than 2%, by weight, to provide a molten mix;
(c) adding, to said molten mix, unmolten iron bearing material in an amount where the unmolten material comprises approximately 5 - 15% by weight, of the resultant mixture comprised of said molten mix and the added unmolten material; and (d) blowing essentially pure oxygen through the resul-tant mixture to refine the same.
(a) providing a supply of molten iron bearing material, having a carbon content of at least 2%, by weight;
(b) adding, to said molten iron, molten steel having a carbon content less than 2%, by weight, to provide a molten mix;
(c) adding, to said molten mix, unmolten iron bearing material in an amount where the unmolten material comprises approximately 5 - 15% by weight, of the resultant mixture comprised of said molten mix and the added unmolten material; and (d) blowing essentially pure oxygen through the resul-tant mixture to refine the same.
2. A process, as described in Claim 1, wherein:
the molten steel added in step (b) is steel melted from scrap metal by oxy-fuel flame.
the molten steel added in step (b) is steel melted from scrap metal by oxy-fuel flame.
3. A process, as described in Claim 1, wherein:
said supply of molten iron comprises typical blast furnace iron.
said supply of molten iron comprises typical blast furnace iron.
4. A process, as described in Claim 1, wherein:
said unmolten material added in step (c) comprises iron ore pellets.
said unmolten material added in step (c) comprises iron ore pellets.
5. A process, as described in Claim 1, wherein:
the molten steel of step (b) comprises 40 - 75%, by weight, of the molten mix.
the molten steel of step (b) comprises 40 - 75%, by weight, of the molten mix.
6. A process for producing refined steel, comprising:
(a) melting a supply of iron bearing material, in a melting chamber, said material being in solid form, with a re-defining flame produced by the combustion of fuel with essentially pure oxygen in a lower position of said chamber;
(b) completing combustion of the reducing gases, resulting from said flame, by providing a supplementary source of combustion supporting gas at an elevated position of said chamber, in respect to said lower position;
(c) adding the molten composition having a carbon content of at least 2%, by weight, resulting from step (a) to another iron bearing molten composition having a carbon content less than 2%, by weight, to produce a molten mix;
(d) combining said molten mix with unmolten ferrous bearing material in an amount comprising approximately 5-15%, by weight of the resultant mixture; and (e) refining the combination of step (d) by injecting essentially pure oxygen into the molten mix.
(a) melting a supply of iron bearing material, in a melting chamber, said material being in solid form, with a re-defining flame produced by the combustion of fuel with essentially pure oxygen in a lower position of said chamber;
(b) completing combustion of the reducing gases, resulting from said flame, by providing a supplementary source of combustion supporting gas at an elevated position of said chamber, in respect to said lower position;
(c) adding the molten composition having a carbon content of at least 2%, by weight, resulting from step (a) to another iron bearing molten composition having a carbon content less than 2%, by weight, to produce a molten mix;
(d) combining said molten mix with unmolten ferrous bearing material in an amount comprising approximately 5-15%, by weight of the resultant mixture; and (e) refining the combination of step (d) by injecting essentially pure oxygen into the molten mix.
7. A process, as described in Claim 6, wherein the combination of step (d) is formed in a vessel separate from that in which step (c) is conducted.
8. A process for the refining of steel-making compositions, which comprises:
(a) providing a supply of molten iron at a temperature of about 2400°F and having a composition comprising, in percent by weight:
.5 - 2.0 Silicon 2.0 min. Carbon .4 - 1.5 Manganese and the balance being essentially iron (b) adding to said molten iron, low carbon molten steel scrap to provide a molten mixture being comprises of approximately 60%
of said molten scrap and approximately 40% of said molten iron composition;
said mixture being at a temperature of about 2600° F
and being of a composition comprising:
.5 .6 Silicon 1.8 - 2.0 Carbon .3 - .4 Manganese (d) adding to said molten mixture unmolten iron bearing material in an amount where said unmolten iron bearing material comprises approximately 5 - 15% of the resultant mixture; and (e) refining said resultant mixture by blowing oxygen therethrough with a nozzle having its discharge opening positioned beneath the surface of the molten charge.
(a) providing a supply of molten iron at a temperature of about 2400°F and having a composition comprising, in percent by weight:
.5 - 2.0 Silicon 2.0 min. Carbon .4 - 1.5 Manganese and the balance being essentially iron (b) adding to said molten iron, low carbon molten steel scrap to provide a molten mixture being comprises of approximately 60%
of said molten scrap and approximately 40% of said molten iron composition;
said mixture being at a temperature of about 2600° F
and being of a composition comprising:
.5 .6 Silicon 1.8 - 2.0 Carbon .3 - .4 Manganese (d) adding to said molten mixture unmolten iron bearing material in an amount where said unmolten iron bearing material comprises approximately 5 - 15% of the resultant mixture; and (e) refining said resultant mixture by blowing oxygen therethrough with a nozzle having its discharge opening positioned beneath the surface of the molten charge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA239,319A CA1070120A (en) | 1975-11-10 | 1975-11-10 | Steelmaking process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA239,319A CA1070120A (en) | 1975-11-10 | 1975-11-10 | Steelmaking process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1070120A true CA1070120A (en) | 1980-01-22 |
Family
ID=4104480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA239,319A Expired CA1070120A (en) | 1975-11-10 | 1975-11-10 | Steelmaking process |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1070120A (en) |
-
1975
- 1975-11-10 CA CA239,319A patent/CA1070120A/en not_active Expired
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