EP2714943A1 - Process for producing clean steels and clean steel produced thereby - Google Patents
Process for producing clean steels and clean steel produced therebyInfo
- Publication number
- EP2714943A1 EP2714943A1 EP12724955.5A EP12724955A EP2714943A1 EP 2714943 A1 EP2714943 A1 EP 2714943A1 EP 12724955 A EP12724955 A EP 12724955A EP 2714943 A1 EP2714943 A1 EP 2714943A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molten steel
- alloys
- furnace
- liquid additive
- elements
- 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.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 42
- 230000000996 additive effect Effects 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000005275 alloying Methods 0.000 claims abstract description 17
- 238000009843 secondary steelmaking Methods 0.000 claims abstract description 7
- 238000009844 basic oxygen steelmaking Methods 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 32
- 239000000956 alloy Substances 0.000 claims description 32
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000000746 purification Methods 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 230000001603 reducing effect Effects 0.000 claims description 5
- 229910005347 FeSi Inorganic materials 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 3
- 238000005188 flotation Methods 0.000 claims description 3
- 229910015136 FeMn Inorganic materials 0.000 claims description 2
- 229910005438 FeTi Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 150000003568 thioethers Chemical class 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000009842 primary steelmaking Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the steel After the primary steelmaking in the oxygen converter or the electric furnace, the steel has not yet reached its final qual ity. Certain operations which have an essential bearing on final product quality are performed during the various secondary or ladle refining treatment: the analytical quality of the liquid metal is adjusted, including compositional trimming. Not only of metallic alloying elements, but also the control of metal loids (C, H , N, O, P, S) to different degrees depending on the g rade. The type and content of oxide inclusions is controlled, by deoxidation (or killing) of the steel, generally by the add ition of aluminium and/or silicon, by calcium treatment to modify their compositions, and by controlled flotation . Other elements like manganese can be used for deoxidation, but aluminium and silicon are the most commonly used elements.
- additive alloys To obtain the desired chemical composition of the steel, other elements are added to the steel, usually in the form of additive alloys. There are three moments in the known steelmaking processes where the addition of additive alloys can be done relatively easily:
- DE10164610 discloses a method to produce TWIP steels comprising up to 30% manganese, silicon and up to 1% carbon . During production of these exotic steels so-called brown smoke develops as a result of the evaporation and subsequent oxidation of manganese and iron and the formation of CO- bubbles which wildly agitate the melt thereby throwing droplets into the air. In DE10164610 an excess of aluminium is added to deoxidise the steel melt to prevent CO-formation in combination with adding the manganese and silicon alloying elements in molten form thus allowing to keep the temperature low thereby counteracting evaporation of volatile elements.
- the invention relates to a method of producing clean steel by means of an oxygen converter process or an electric furnace to produce a molten steel wherein the molten steel is further processed in a secondary steelmaking process characterised in that the secondary steelmaking process involves the add ition of add itive al loying elements which are l iq u id at the moment of addition to the molten steel wherein the liquid additive alloying elements to be added to the molten steel have been subjected to a purification treatment prior the moment of addition to the molten steel and wherein the purification treatment involves reducing the contamination of the liquid additive alloys by removing unwanted elements such as Al from FeSi, Ca from FeSi, Zr from FeTi and/or S from FeMn.
- the purification treatment is performed in an electric induction furnace or an electric arc furnace or in any other device that can heat the additive alloys to a temperature higher than their melting point.
- the pu rification treatment involves red ucing the amou nt of strong ly oxid isi ng elements from the add itive al l oys thereby creating the correct oxygen potential in the argon or nitrogen shielded furnace after melting, so that the oxidising elements react with the oxygen.
- the slag on the liquid additive alloys is skimmed just before the liquid additive alloys are added to the molten steel . This also diminishes the amount of unwanted elements added to the molten steel.
- the sulphur content of the liquid additive alloys is reduced by adding a desulphurising slag onto the melted alloy in a fully argon or nitrogen shielded furnace and/or the addition of some additional Al, Ti or Si to enable the desulphurisation reaction.
- the liquid is added to or into the molten steel while the latter is held in a ladle which is usually gas-agitated or gas-stirred .
- the bubble breakthrough region at the upper surface of the molten steel is commonly referred to as spout region or the plume eye.
- the stirring may also be performed by means of electromag netic stirring in which case there is no plume eye as defined above.
- a ladle shroud can be used or any other refractory tube, which is fitted below a small tundish, as illustrated in figure 1.
- the small tundish serves as a temporary holder of the liquid additive alloys prior to being added to the molten steel.
- this embodiment can also be used in a ladle which is not gas-agitated . It is the preferred embodiment of the two adding methods.
- FIG. 1 shows a schematic representation of the embodiment in which the liquid additive alloying elements are added in the plume eye.
- Vessel 1 represents the vessel or furnace in which the additive alloys are melted .
- the liquid add itive al loying elements 2 are subsequently poured into a tund ish 3, which serves as a temporary holder of the liq uid additive alloying elements.
- a tube 5 usually a ceramic tube, the alloying elements are poured through the ladle slag 4 into the plume eye 8 which is caused by the rising bubbles 7 of the gas-stirring 9 into the molten steel 6.
- figure 1 A variant of figure 1 is presented in figure 2 where the exit of the tube 5 is suspended just above the pl ume eye. This way any pressure d ifference between the liquid alloy and molten steel is avoided.
- FIG. 3 shows a schematic representation of the embodiment in which the liquid additive alloying elements are added through the nozzle though the slag in the molten steel .
- Vessel 1 represents the vessel or furnace in which the additive alloys are melted .
- the liquid additive alloying elements 2 are subsequently poured into a tundish 3, which serves as a temporary holder of the liquid additive alloying elements.
- a tube 5 usually a ceramic tube, the alloying elements are poured through the ladle slag 4 away from the plume eye 8 which is caused by the rising bubbles 7 of the gas-stirring 9 into the molten steel 6.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Method of producing clean steel by means of an oxygen converter process or an electric furnace to produce a molten steel wherein the molten steel is further processed in a secondary steelmaking process characterised in that the secondary steelmaking process involves the addition of additive alloying elements which are liquid at the moment of addition to the molten steel.
Description
PROCESS FOR PRODUCI NG CLEAN STEELS AND CLEAN STEEL PRODUCED THEREBY
This invention relates to a method of producing clean steel by means of an oxygen converter process or an electric furnace to produce a molten steel wherein the molten steel is further processed in a secondary steelmaking process.
After the primary steelmaking in the oxygen converter or the electric furnace, the steel has not yet reached its final qual ity. Certain operations which have an essential bearing on final product quality are performed during the various secondary or ladle refining treatment: the analytical quality of the liquid metal is adjusted, including compositional trimming. Not only of metallic alloying elements, but also the control of metal loids (C, H , N, O, P, S) to different degrees depending on the g rade. The type and content of oxide inclusions is controlled, by deoxidation (or killing) of the steel, generally by the add ition of aluminium and/or silicon, by calcium treatment to modify their compositions, and by controlled flotation . Other elements like manganese can be used for deoxidation, but aluminium and silicon are the most commonly used elements.
The temperature is controlled by management of heat losses during the various operations, by reheating, or where necessary by cooling with the aid of suitable amounts of scrap.
To obtain the desired chemical composition of the steel, other elements are added to the steel, usually in the form of additive alloys. There are three moments in the known steelmaking processes where the addition of additive alloys can be done relatively easily:
• at the moment of tapping the molten steel from the BOF-converter or from the electric arc furnace (EAF) into a ladle,
• during ladle metallurgy where very exact adjustments to steel by the addition of the additive alloys can be made, or
• in the casting tundish so that for instance several grades can be made out of one converter- or EAF-heat.
The addition of additive alloys is usually performed in the form of pellets of the additive alloy(s) or broken iron-alloy metals.
DE10164610 discloses a method to produce TWIP steels comprising up to 30% manganese, silicon and up to 1% carbon . During production of these exotic steels so-called brown smoke develops as a result of the evaporation and subsequent oxidation of manganese and iron and the formation of CO- bubbles which wildly agitate the melt thereby throwing droplets into the air. In DE10164610 an excess of aluminium is added to deoxidise the steel melt to prevent CO-formation in combination with adding the manganese and silicon alloying elements in molten form thus allowing to keep the temperature low thereby counteracting evaporation of volatile elements.
The invention relates to a method of producing clean steel by means of an oxygen converter process or an electric furnace to produce a molten steel wherein the molten steel is further processed in a secondary steelmaking process characterised in that the secondary steelmaking process involves the add ition of add itive al loying elements which are l iq u id at the moment of addition to the molten steel wherein the liquid additive alloying elements to be added to the molten steel have been subjected to a purification treatment prior the moment of addition to the molten steel and wherein the purification treatment involves reducing the contamination of the liquid additive alloys by removing unwanted elements such as Al from FeSi, Ca from FeSi, Zr from FeTi and/or S from FeMn.
In this way very pure alloys can be added to the steel to make clean steels that will not be affected by residuals or oxides or sulphides originally present in the solid as bought alloys.
The advantage of the process according to the invention is that the additive alloying elements added to the molten steel are optimally suited to perform their task without introducing unwanted elements in the molten steel . Th is resu lts i n a steel with out ad d itiona l elements in the molten state immediately prior to casting, and therefore also in a steel with a smaller amount of unwanted elements in the solidified steel. These unwanted elements usually manifest themselves in the form of inclusions or precipitates in the solid matrix. These inclusions or precipitates affect the formability of the steel , for instance during deep d rawing or wire drawing, or they result in surface defects which is unacceptable for appl ications where the surface quality of the steel is one of the important properties. This is particularly the case fo r o ute r pa n el s fo r a uto m o b i l e a p p l i cati o n s . W i re b rea ka g e o r
contamination of wire by inclusions is of particular interest in the case of steel cast as bl ooms o r bi l lets for a ppl ications su ch as wel d i n g wi re, or fo r automotive tyres etc. Clean billets or blooms will lead to fewer occurrences of wire breakage during wire drawing . The purification treatment diminishes the amount of unwanted elements added to the molten steel .
In an embodiment the purification treatment is performed in an electric induction furnace or an electric arc furnace or in any other device that can heat the additive alloys to a temperature higher than their melting point.
Preferably these additive alloys are melted in a melting facility which is provided with means to shield the (molten) additive alloys from the surround ing atmosphere . Preferably this shield ing is performed by gas- shielding, such as argon or nitrogen shielding . The invention is therefore also embodied in a method wherein the additive alloys, molten or otherwise, are shielded from the surrounding atmosphere, preferably by gas-shielding, such as argon or nitrogen shielding .
In an embod iment the pu rification treatment involves red ucing the amou nt of strong ly oxid isi ng elements from the add itive al l oys thereby creating the correct oxygen potential in the argon or nitrogen shielded furnace after melting, so that the oxidising elements react with the oxygen.
In an embodiment the purification treatment involves reducing the amount of oxides and sulphides which do not dissolve in the liquid additive alloys by flotation in the furnace after melting the additive alloys.
In a preferable embod iment the slag on the liquid additive alloys is skimmed just before the liquid additive alloys are added to the molten steel . This also diminishes the amount of unwanted elements added to the molten steel.
In an embodiment the sulphur content of the liquid additive alloys is reduced by adding a desulphurising slag onto the melted alloy in a fully argon or nitrogen shielded furnace and/or the addition of some additional Al, Ti or Si to enable the desulphurisation reaction.
In adding the liquid additive alloying elements a special way is needed to add the liquid to the molten steel without causing re-oxidation and in order to have a reproducible and high recovery of the alloying element.
The liquid is added to or into the molten steel while the latter is held in a ladle which is usually gas-agitated or gas-stirred . The bubble breakthrough
region at the upper surface of the molten steel is commonly referred to as spout region or the plume eye. The stirring may also be performed by means of electromag netic stirring in which case there is no plume eye as defined above.
In an embodiment a ladle shroud can be used or any other refractory tube, which is fitted below a small tundish, as illustrated in figure 1. The small tundish serves as a temporary holder of the liquid additive alloys prior to being added to the molten steel.
Two ways of adding can be employed :
1. to add the liquid additive alloying elements to the steel in the plume eye by adjusting the tube just above the plume eye to avoid dragging in ladle slag or,
2. to put through the tube through the ladle slag into the molten steel, so that a plume eye is not necessary.
Consequently this embodiment can also be used in a ladle which is not gas-agitated . It is the preferred embodiment of the two adding methods.
In the following, non-limitative and schematic figures, the invention is further explained .
Figure 1 shows a schematic representation of the embodiment in which the liquid additive alloying elements are added in the plume eye. Vessel 1 represents the vessel or furnace in which the additive alloys are melted . In this embod iment the liquid add itive al loying elements 2 are subsequently poured into a tund ish 3, which serves as a temporary holder of the liq uid additive alloying elements. By means of a tube 5, usually a ceramic tube, the alloying elements are poured through the ladle slag 4 into the plume eye 8 which is caused by the rising bubbles 7 of the gas-stirring 9 into the molten steel 6.
A variant of figure 1 is presented in figure 2 where the exit of the tube 5 is suspended just above the pl ume eye. This way any pressure d ifference between the liquid alloy and molten steel is avoided.
Figure 3 shows a schematic representation of the embodiment in which the liquid additive alloying elements are added through the nozzle though the slag in the molten steel . Vessel 1 represents the vessel or furnace in which the additive alloys are melted . In this embodiment the liquid additive alloying elements 2 are subsequently poured into a tundish 3, which serves as a
temporary holder of the liquid additive alloying elements. By means of a tube 5, usually a ceramic tube, the alloying elements are poured through the ladle slag 4 away from the plume eye 8 which is caused by the rising bubbles 7 of the gas-stirring 9 into the molten steel 6.
Claims
1. Method of producing clean steel by means of an oxygen converter process or an electric furnace to produce a molten steel wherein the molten steel is further processed in a secondary steelmaking process wherein the secondary steelmaking process involves the addition of additive alloying elements which are liquid at the moment of addition to the molten steel wherein the liquid additive alloying elements to be added to the molten steel have been subjected to a purification treatment prior the moment of addition to the molten steel and wherein the purification treatment involves reducing the contamination of the liquid additive alloys by removing unwanted elements such as Al from FeSi, Ca from FeSi, Zr from FeTi and/or S from FeMn.
2. Method according to claim 1 wherein the purification treatment is performed in an electric induction furnace or an electric arc furnace or in any other device that can heat the additive alloys to a temperature higher than their melting point.
3. Method according to claim 1 or 2 wherein the additive alloys are shielded from the surrounding atmosphere, preferably by gas-shielding, such as argon or nitrogen shielding .
4. Method according to claim 1 or 3 wherein the purification treatment involves reducing the amount of strongly oxidising elements from the liquid additive alloys thereby creating the correct oxygen potential in the argon or nitrogen shielded purification furnace after melting, so that the oxidising elements react with the oxygen.
5. Method according to any one of claim 1 to 4 wherein the purification treatment involves decreasing the amount of oxides and sulphides which do not dissolve in the liquid additive alloys by flotation in the furnace after melting the additive alloys.
6. Method according to any one of claim 1 to 5 wherein the slag on the liquid additive alloys is skimmed just before the liquid additive alloys are added to the molten steel.
7. Method according to any one of claim 1 to 5 wherein the sulphur content of the liquid additive alloys is reduced by adding a desulphurising slag onto the melted alloy in a fully argon or nitrogen shielded furnace and/or the addition of some additional Al, Ti or Si to enable the desulphurisation reaction.
8. Clean steel produced by the method of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP12724955.5A EP2714943A1 (en) | 2011-05-27 | 2012-05-25 | Process for producing clean steels and clean steel produced thereby |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP11167992 | 2011-05-27 | ||
| PCT/EP2012/059881 WO2012163849A1 (en) | 2011-05-27 | 2012-05-25 | Process for producing clean steels and clean steel produced thereby |
| EP12724955.5A EP2714943A1 (en) | 2011-05-27 | 2012-05-25 | Process for producing clean steels and clean steel produced thereby |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2714943A1 true EP2714943A1 (en) | 2014-04-09 |
Family
ID=44801258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12724955.5A Withdrawn EP2714943A1 (en) | 2011-05-27 | 2012-05-25 | Process for producing clean steels and clean steel produced thereby |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2714943A1 (en) |
| WO (1) | WO2012163849A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO310980B1 (en) * | 2000-01-31 | 2001-09-24 | Elkem Materials | Process for grain refining of steel, grain refining alloy for steel and process for the production of grain refining alloy |
| DE10164610C1 (en) | 2001-12-27 | 2003-07-17 | Thyssenkrupp Stahl Ag | Producing a steel melt comprises melting a process material into a melt, deoxidizing the melt with aluminum, adding manganese and silicon to the deoxidized melt, and treating the melt |
| UA82962C2 (en) * | 2005-12-02 | 2008-05-26 | Sms Demag Ag | Method and smelting unit for obtaining steel with high manganese and low carbon content |
-
2012
- 2012-05-25 EP EP12724955.5A patent/EP2714943A1/en not_active Withdrawn
- 2012-05-25 WO PCT/EP2012/059881 patent/WO2012163849A1/en not_active Ceased
Non-Patent Citations (2)
| Title |
|---|
| None * |
| See also references of WO2012163849A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012163849A1 (en) | 2012-12-06 |
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