EP1434890A1 - Verfahren zum herstellen von nichtkornorientierten elektroblechen - Google Patents
Verfahren zum herstellen von nichtkornorientierten elektroblechenInfo
- Publication number
- EP1434890A1 EP1434890A1 EP02779469A EP02779469A EP1434890A1 EP 1434890 A1 EP1434890 A1 EP 1434890A1 EP 02779469 A EP02779469 A EP 02779469A EP 02779469 A EP02779469 A EP 02779469A EP 1434890 A1 EP1434890 A1 EP 1434890A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- hot
- casting
- ppm
- carbon content
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
- C21D8/1211—Rapid solidification; Thin strip casting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
Definitions
- non-grain-oriented electrical sheet is understood to mean a steel sheet or a sheet steel strip which, regardless of its texture, falls under the sheets mentioned in DIN 46 400 Part 1 or 4 and whose loss anisotropy does not meet the maximum values specified in DIN 46 400 Part 1 exceeds.
- electrical sheet and “electrical steel” are used synonymously here.
- B 25 hereinafter denotes the magnetic polarization at a magnetic field strength "H” of 2500 A / m.
- P 1.5 is understood to mean the loss of remagnetization with a polarization of 1.5 T and a frequency of 50 Hz.
- the carbon content of the sheets is of major importance for the magnetic properties of non-grain-oriented electrical sheets. High carbon contents lead to magnetic aging, which leads to a sharp increase in losses.
- these measures include intensive decarburization of the steel in the RH plant.
- an optimized ladle slag working method is used, with which it is possible to reduce the increase in the C content associated with every temperature increase to a minimum.
- the pan slag must have a low C content.
- the slags obtained in this way must be added as early as possible, but at the latest before the vacuum treatment.
- an argon purge treatment is carried out. Due to the early slag application combined with a rinsing treatment, carbonates in the slag, such as e.g. B. CaC0 3 decay into CaO and C0 2 , without the transition of carbon into the steel. With this procedure it is possible to produce electrical steel with particularly low carbon contents.
- the decarburization of the sheets can also be carried out by a suitable decarburization annealing after the strips have been hot-rolled and then cold-rolled. Following the melting process, the melt is cast into slabs using the conventional method. The slabs are then reheated and pre-rolled in order to be finally rolled into hot strip. If sheet thicknesses are required that cannot be made available as hot strip, the hot strip is usually cold-rolled in one or more stages to the required final thickness.
- CSP system casting and rolling system
- strip casting system Another way to save slab casting, reheating and roughing is to produce hot rolled electrical steel strips using a so-called "strip casting system".
- low-carbon steel produced in the manner described is cast between casting rolls rotating in opposite directions to form cast strip, which is then subjected to hot rolling.
- the thicknesses of the hot strip obtained in this way are in the range from 1.8 mm to 3 mm.
- the object of the invention is to provide a method for producing non-grain-oriented electrical sheets with extremely low carbon contents.
- the steel is cast and hot-rolled, largely avoiding carburization, so that the carbon content of the hot strip obtained after hot rolling is below 100 ppm.
- a low-carbon steel alloy known per se for the production of electrical sheets is cast in a casting and rolling plant to form a strand and thin slabs produced therefrom or in a strip casting plant to cast strip.
- the strip or thin slabs are then continuously rolled into hot strip.
- the carburization in the casting process is kept low, the cast strip or strand and the thin slabs produced therefrom coincide with the respective carbon-old environment during the casting process or during the work steps immediately followed with such a low carbon content that the then unavoidable carburization does not become one of the specified according to the invention Limit increases beyond the carbon content leads.
- the individual rolling steps themselves can also be carried out in such a way that the risk of carburization is minimized.
- One measure within the scope of the invention for avoiding carburization is, for example, to guide the melt during casting through a distribution device with devices arranged therein for deflecting the melt stream in such a way that mixing of slag and steel lying on the melt is avoided.
- This can be achieved by means of suitable internals in the distribution channel, by means of which the melt flow in the distribution channel is calmed.
- a calmed bath level is achieved in the distribution channel, in which the area of the phase transition between slag and melt is kept largely free of turbulence.
- the measure serves the same purpose to control the inflow of the melt flow into the distribution device by means of a stopper device in such a way that an essentially constant melt level is obtained in the casting device used in each case.
- a stopper device in such a way that an essentially constant melt level is obtained in the casting device used in each case.
- the development of smooth melt movements in the distributor channel and in the mold or in the casting gap is favored with the result that the miniscus in the pouring area and the phase boundary steel / slag on the surface of the melt level are stabilized.
- melt in the casting mold or the casting gap are supported in that the melt flow flowing from the distribution device into the mold or the casting gap of the casting device used in each case is regulated by means of an electromagnetic brake.
- the immersion tube connected to the distribution channel can also be designed in such a way that the melt flow is calmed down and the bath level movements in the mold or occurs in the casting gap.
- flow dividers or other obstacles can be provided in the dip tube in a manner known per se, which lead to the elimination of kinetic energy of the melt flow, with the result that a melt jet that is as turbulent as possible enters the casting gap or the casting mold.
- components of the distribution device which come into contact with the melt are made from a material with a low carbon content.
- the hot strips produced according to the invention are basically suitable for being used directly for the production of electrical machines or other electrical devices. However, if sheet metal with lower final thicknesses is required, hot strip produced according to the invention can be readily produced Pickle, cold roll to a final thickness of ⁇ 0.75 mm and then heat treat.
- the cold strip obtained in this way has guaranteed magnetic reversal losses P 1 # 5 of less than 6.5 W / kg due to the production method according to the invention.
- Cold rolling can be carried out in one or more stages in a known manner. If at least two-stage cold rolling is carried out, in order to optimize the properties of the non-grain-oriented electrical sheet obtained in the last cold rolling stage, the degree of deformation should not exceed 15%.
- the heat treatment of the strip since the strip produced according to the invention has extremely low carbon contents, can be carried out in a low to non-decarburizing atmosphere.
- the outstanding properties of cold baths produced according to the invention can also be guaranteed with relatively large final thicknesses of, for example, 0.5 mm or 0.65 mm.
- the maximum permissible deviation of the final thickness of the cold strip from the respective target specification should be a maximum of 2%.
- the procedure according to the invention makes it possible to carry out the casting process and the subsequent hot rolling in such a way that the difference between the carbon content of the molten steel before casting and the carbon content of the hot strip obtained after hot rolling is less than 30 ppm by weight, preferably less than 10 percent by weight .ppm or even less than 5 wtppm. In this way it can be used accordingly low carbon content of the starting melt produce a hot strip which is less than 50 ppm by weight, preferably less than 30 ppm by weight. having.
- a non-grain-oriented electrical sheet with such low carbon contents has a particularly low tendency to magnetic aging and shows particularly low losses.
- Low-carbon steel melts A-D have been melted in a conventional manner to produce non-grain-oriented electrical sheets. These are steels. subsequently cast into thin slabs using a conventional casting and rolling system, which was then hot-rolled in a continuously successive sequence.
- Table 1 shows the compositions in the liquid phase for steel melts A, B, C, D, E, F when leaving the steelworks.
- the respective melt was poured into the casting gap formed between two cooled casting rolls of the casting and rolling system via an immersion pipe connected to a distributor trough.
- the distribution channel and / or the dip tube were designed so that the melt stream entered the casting gap with low kinetic energy.
- a control was provided with which the melt flow entering the casting gap could be metered exactly. In this way, the movements at the transition between the slag floating on the surface of the melt present in the casting gap and the melt located underneath were minimized, so that the slag was prevented from being drawn into the melt as far as possible.
- Table 2 shows the compositions of the thin slabs produced from the steel melts AF when they leave the casting and rolling plant.
- the cast thin slab emerging from the mold with a thickness of, for example, 50 mm was continuously fed to a hot rolling mill, in which it was finished rolled to a final hot strip thickness of 2.5 mm with a degree of deformation of up to 96%.
- the hot strips obtained in this way were then further processed in a conventional manner to a cold strip, in which they were pickled, multi-stage cold-rolled to a final thickness of 0.5 mm and finally subjected to a final annealing.
- the properties of the strips obtained in this way are given in Table 3 for cold strip samples produced from AF steels.
- "P 1.5" is the magnetic loss at a polarization of 1.5 T and a frequency of 50 Hz
- P 1.5 the magnetic loss at a polarization of 1.5 T and a frequency of 50 Hz
- J2500 the magnetic polarization at a magnetic field strength of 2500 A / m
- J5000 the magnetic polarization at a magnetic field strength of 5000 A / m designated.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001150642 DE10150642A1 (de) | 2001-10-12 | 2001-10-12 | Verfahren zum Herstellen von nicht kornorientierten Elektroblechen |
DE10150642 | 2001-10-12 | ||
PCT/EP2002/011286 WO2003033746A1 (de) | 2001-10-12 | 2002-10-09 | Verfahren zum herstellen von nichtkornorientierten elektroblechen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1434890A1 true EP1434890A1 (de) | 2004-07-07 |
Family
ID=7702436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02779469A Ceased EP1434890A1 (de) | 2001-10-12 | 2002-10-09 | Verfahren zum herstellen von nichtkornorientierten elektroblechen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1434890A1 (de) |
DE (1) | DE10150642A1 (de) |
WO (1) | WO2003033746A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104805353A (zh) * | 2015-05-07 | 2015-07-29 | 马钢(集团)控股有限公司 | 一种纵向磁性能优异电工钢及其生产方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1583626A1 (de) * | 1967-12-05 | 1970-09-24 | Maximilianshuette Eisenwerk | Verfahren zum Stranggiessen von Staehlen mit niedrigem Kohlenstoffgehalt |
JPS5468717A (en) * | 1977-11-11 | 1979-06-02 | Kawasaki Steel Co | Production of unidirectional silicon steel plate with excellent electromagnetic property |
JPS5662662A (en) * | 1979-10-25 | 1981-05-28 | Nippon Steel Corp | Molten steel heat insulating method of less carburization |
WO1983000878A1 (en) * | 1981-08-28 | 1983-03-17 | Nippon Steel Corp | Process for manufacturing steel for isotropic silicon steel plate |
JPS6360227A (ja) * | 1986-08-29 | 1988-03-16 | Sumitomo Metal Ind Ltd | 無方向性電磁鋼板の製造方法 |
JPH08283853A (ja) * | 1995-04-11 | 1996-10-29 | Nippon Steel Corp | 磁気特性の優れた無方向性電磁鋼板の製造方法 |
EP0997540B1 (de) * | 1998-10-27 | 2004-04-28 | JFE Steel Corporation | Elektrostahlblech und dessen Herstellungsverfahren |
DE19918484C2 (de) * | 1999-04-23 | 2002-04-04 | Ebg Elektromagnet Werkstoffe | Verfahren zum Herstellen von nichtkornorientiertem Elektroblech |
DE19930518C1 (de) * | 1999-07-05 | 2000-10-12 | Thyssenkrupp Stahl Ag | Verfahren zum Herstellen von nicht kornorientiertem Elektroblech |
-
2001
- 2001-10-12 DE DE2001150642 patent/DE10150642A1/de not_active Withdrawn
-
2002
- 2002-10-09 EP EP02779469A patent/EP1434890A1/de not_active Ceased
- 2002-10-09 WO PCT/EP2002/011286 patent/WO2003033746A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO03033746A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003033746A1 (de) | 2003-04-24 |
DE10150642A1 (de) | 2003-04-30 |
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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 |
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AK | Designated contracting states |
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AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: RASIM, WOLFGANG A. Inventor name: FRIEDRICH, KARL, ERNST Inventor name: WUPPERMANN, CARL-DIETER Inventor name: SCHNEIDER, JUERGEN Inventor name: TELGER, KARL |
|
17Q | First examination report despatched |
Effective date: 20041208 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: THYSSENKRUPP STEEL AG |
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