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- Withdrawn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
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
Description
Claims
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 | ||
EP12724955.5A EP2714943A1 (en) | 2011-05-27 | 2012-05-25 | Process for producing clean steels and clean steel produced thereby |
PCT/EP2012/059881 WO2012163849A1 (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 WO PCT/EP2012/059881 patent/WO2012163849A1/en active Application Filing
- 2012-05-25 EP EP12724955.5A patent/EP2714943A1/en not_active Withdrawn
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2012163849A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012163849A1 (en) | 2012-12-06 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20140102 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: TATA STEEL NEDERLAND TECHNOLOGY B.V. |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: VAN DER KNOOP, WILLEM Inventor name: TIEKINK, WOUTER KAREL |
|
17Q | First examination report despatched |
Effective date: 20170111 |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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INTG | Intention to grant announced |
Effective date: 20171204 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20180417 |