EP1662010A1 - Hot steel strip particularly suited for the production of electromagnetic lamination packs - Google Patents
Hot steel strip particularly suited for the production of electromagnetic lamination packs Download PDFInfo
- Publication number
- EP1662010A1 EP1662010A1 EP04425877A EP04425877A EP1662010A1 EP 1662010 A1 EP1662010 A1 EP 1662010A1 EP 04425877 A EP04425877 A EP 04425877A EP 04425877 A EP04425877 A EP 04425877A EP 1662010 A1 EP1662010 A1 EP 1662010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel strip
- strip according
- fact
- parallelism
- silicon
- 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.)
- Granted
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Classifications
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- 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
- C21D8/1238—Flattening; Dressing; Flexing
-
- 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
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- 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
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
Definitions
- the present invention relates to a low carbon hot rolled steel strip having such features that it can replace, in producing cut lamination packs, such as stators and rotors of electric motors, the cold rolled strips till now used for these utilizations.
- WO2004/013365 and EP1411138 disclose non-oriented grain magnetic strips provided with special chemical-physical features that, upon cold rolling and annealing treatment, render the same suitable to be used for producing, after cutting, lamination packs such as stators and rotors of electric motors.
- the strip according to the present invention is preferably, although not exclusively, manufactured by means of in-line systems of the "thin-slab" type, like the one described in the international publication WO 2004/026497 in the name of the same applicant, as schematically represented in Fig. 5, and this characterized, as set forth in claim 1, by a low silicon content (lower than 0.03 %) and a structure the fineness of which is higher than grade 9 of the ASTM E 112 standard, with a thickness comprised between 0.65 and 1.5 mm, a parallelism rate ⁇ 0.02 mm and a roughness ⁇ 1.3 ⁇ m.
- the mean thickness is preferably of 0.65 - 1.0 mm with strict tolerances of ⁇ 0.05 mm, whereas the parallelism is preferably even less than 0.01 mm.
- the hardness of the strip according to the present invention can reach values of HRB 55/70 or HV110/140.
- the particular roughness ⁇ 1.3 ⁇ m of the strip is helpful to prevent the cut pieces from closely joining together when packed to form a multilayer, thanks to the air being present in the gaps caused by the roughness, and in general the above-described features make this type of hot rolled strip particularly suitable to a fine cutting without any need of having to trim and straighten the cut pieces, thereby rendering them ready for the subsequent packing steps, which in general are carried out in-line and automatically, thus eliminating the trimming and straightening operations which are required in the traditional systems.
- the hot rolled steel strip according to the present invention can replace, without annealing treatment, the cold rolled strips for producing, upon cutting, lamination packs of magnetic sheets.
- the thickness of said steel strip is of 0.65-1.5 mm, preferably 0.65-1.0 mm with strict tolerances of ⁇ 0.05 mm and parallelism rate ⁇ 0.02, preferably 0.01 mm.
- the strip according to the prior art is characterized by a silicon content > 0.5 % and a ferritic grain with fineness lower than grade 7 of ASTM E 112 standard to enhance the magnetic permeability
- the strip according to the invention shows magnetic features comparable with those of non-oriented grain silicon-based strips being hot rolled and subsequently annealed to increase the size of the ferritic grain. This appears to be due to the substantial uniformity of the ferritic grain, wherein the 70% of the grains show a fineness grade comprised between levels 9 and 12 of the above-mentioned ASTM standard, thus rendering particularly permeable the magnetism of the same strip.
- the grain size plays a basic role concerning the magnetic permeability of the steel, experimental tests have in fact shown that in this respect the feature of the grain uniformity is also very important, irrespective of its size.
- the feature of uniformity of the ferritic grain which is fine and particularly homogeneous, descends also in particular from the microphotograph magnified one thousand times as represented in figure 2.
- packing factor which is defined as a ratio between the weight of a multilayer packet of regular shape (P) and that of a solid steel block having the same size (P').
- the strip according to the present invention is produced in a plant such as the one schematically illustrated in figure 5, for the continuous hot rolling, such as of the type being the object of publication WO2004/026497, from which the strip according to the present invention can be obtained with the above indicated features.
- the lower portion of the lay-out relates to the possible operations of pickling and skinpassing to which the strip from the rolling step can be subjected, thus being able to reach hardness values corresponding to HRB 55/70 or HV 110/140.
- Another advantage of the steel according to the invention is that of avoiding the critical state of the traditional non-oriented grain silicon steel, the slabs of which must be heated at temperatures higher (by about 200°C) than requested by the other steels which do not include silicon and must be cooled more slowly with a controlled process before the subsequent rolling step to avoid cracks on the slab itself.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
- The present invention relates to a low carbon hot rolled steel strip having such features that it can replace, in producing cut lamination packs, such as stators and rotors of electric motors, the cold rolled strips till now used for these utilizations.
- For example WO2004/013365 and EP1411138 disclose non-oriented grain magnetic strips provided with special chemical-physical features that, upon cold rolling and annealing treatment, render the same suitable to be used for producing, after cutting, lamination packs such as stators and rotors of electric motors.
- It is also known that cold rolling involves a cycle of operations which is rather burdensome when considering the required costs and time. These strips of known type are further characterized by a relatively high content of silicon and by a structure with not particularly fine grains. It is known in fact that the steel strip that is commonly used in the technique for the above-mentioned utilizations generally shows a silicon content > 0.5%, having a structure with ferritic grains not particularly fine and usually even lower than
grade 7 of the ASTM standard, in order to enhance its magnetic permeability. - It is an object of the present invention to provide a low carbon hot rolled steel strip having a reduced silicon content and thickness comprised between 0.65 and 1.5 mm, which shows without subsequent cold rolling or additional treatments, particular metallurgical and geometrical features, as well as relating to planarity and hardness, which may render the same particularly, although not exclusively, suitable to the production of lamination that, upon cutting can form the multilayer packs suitable for the above-mentioned utilizations.
- The strip according to the present invention is preferably, although not exclusively, manufactured by means of in-line systems of the "thin-slab" type, like the one described in the international publication WO 2004/026497 in the name of the same applicant, as schematically represented in Fig. 5, and this characterized, as set forth in
claim 1, by a low silicon content (lower than 0.03 %) and a structure the fineness of which is higher than grade 9 of the ASTM E 112 standard, with a thickness comprised between 0.65 and 1.5 mm, a parallelism rate< 0.02 mm and a roughness ≥ 1.3 µm. - The mean thickness is preferably of 0.65 - 1.0 mm with strict tolerances of ± 0.05 mm, whereas the parallelism is preferably even less than 0.01 mm. Upon possible pickling and skinpassing operations, the hardness of the strip according to the present invention can reach values of HRB 55/70 or HV110/140.
- The particular roughness ≥ 1.3 µm of the strip is helpful to prevent the cut pieces from closely joining together when packed to form a multilayer, thanks to the air being present in the gaps caused by the roughness, and in general the above-described features make this type of hot rolled strip particularly suitable to a fine cutting without any need of having to trim and straighten the cut pieces, thereby rendering them ready for the subsequent packing steps, which in general are carried out in-line and automatically, thus eliminating the trimming and straightening operations which are required in the traditional systems.
- These and other objects, advantages and features of the steel strip according to the invention will become clearer from the following detailed description with reference to the annexed drawings in which:
- Figure 1 shows, being graphically plotted, the curves of the frequency with which the presence of a given size of the grain has been statistically detected in a number of coils at the beginning, in the middle and at the end respectively of each coil of strip according to the present invention;
- Figure 2 shows a detail of the microstructure of the same strip, when seen with a magnification x 1000;
- Figure 3 shows a distribution of the burrs in mm, as experimentally detected on a number of pieces cut from a strip according to the present invention;
- Figure 4 schematically shows how is calculated the packing factor (rolling parameter according to the Italian standard UNI EN 10126) reference to which will be made in the following as indicator of parallelism and of the presence of burrs in the cut pieces of lamination;
- Figure 5 schematically shows a type of plant, such as that of the above-mentioned publication WO2004/026497, preferably used to manufacture the strip of the present invention; and
- Figure 6 shows a flow-chart of comparison between the manufacturing cycle of the strips according to the prior art and the present invention.
- As already stated above, the hot rolled steel strip according to the present invention can replace, without annealing treatment, the cold rolled strips for producing, upon cutting, lamination packs of magnetic sheets. The thickness of said steel strip is of 0.65-1.5 mm, preferably 0.65-1.0 mm with strict tolerances of ± 0.05 mm and parallelism rate < 0.02, preferably 0.01 mm.
- While the magnetic strip according to the prior art is characterized by a silicon content > 0.5 % and a ferritic grain with fineness lower than
grade 7 of ASTM E 112 standard to enhance the magnetic permeability, the strip according to the invention, in spite of the very low silicon content (< 0.03%) and the grain fineness higher than grade 9 of the above-mentioned standard, shows magnetic features comparable with those of non-oriented grain silicon-based strips being hot rolled and subsequently annealed to increase the size of the ferritic grain. This appears to be due to the substantial uniformity of the ferritic grain, wherein the 70% of the grains show a fineness grade comprised betweenlevels 9 and 12 of the above-mentioned ASTM standard, thus rendering particularly permeable the magnetism of the same strip. Although the grain size plays a basic role concerning the magnetic permeability of the steel, experimental tests have in fact shown that in this respect the feature of the grain uniformity is also very important, irrespective of its size. - With reference to figure 1 it can be observed how fine is the microstructure of the strips according to the invention in which in fact more than 80% of the grains has a size of less than that corresponding to grade 9 of the ASTM E 112 standard and thereby a fineness better than grade 9 itself.
- The feature of uniformity of the ferritic grain, which is fine and particularly homogeneous, descends also in particular from the microphotograph magnified one thousand times as represented in figure 2.
- Coming now to another feature of the strip according to the invention, i.e. the little height of the cutting burrs, the upper limit of which as requested on the market is of 0.04 mm, the graph of figure 3 clearly shows how such a limit is fully met by the strip of the invention, with which the value of 0.04 mm does not appear to have been reached.
- In order to determine the features of planarity and parallelism of the steel strip, in relation with the product of the intended use, i.e. lamination packs of magnetic sheets, in particular but not exclusively for producing stators and rotors of electric motors, reference is usually made to a packing factor which is defined as a ratio between the weight of a multilayer packet of regular shape (P) and that of a solid steel block having the same size (P'). Obviously the highest value of packing factor that is possible to reach is equal to 1, as can be seen with reference to figure 4, where on the left side a multi layer packet is represented and a solid steel block on the right side. Through said factor P/P' a measure of the parallelism of the multilayer pack is obtained, or in other words a check of the possible presence of gaps due to burrs or thickness unevenness. Experimental tests carried out on each position of the strip have shown that such a factor is very high, comparable with that of cold strips, which is comprised between 0.90 and 0.99, not only but in the field of the highest values corresponding to a parallelism grade < 0.02 mm and even lower than 0.01 mm.
- The strip according to the present invention is produced in a plant such as the one schematically illustrated in figure 5, for the continuous hot rolling, such as of the type being the object of publication WO2004/026497, from which the strip according to the present invention can be obtained with the above indicated features. In particular the lower portion of the lay-out relates to the possible operations of pickling and skinpassing to which the strip from the rolling step can be subjected, thus being able to reach hardness values corresponding to HRB 55/70 or HV 110/140.
- In the flow-chart of Fig. 6 there are clearly indicated on the right side the main steps of the manufacturing cycle of the strip according to the invention in a system of this type, thus pointing out the lower number of steps with respect to those of a manufacturing cycle according to the prior art, which involves the cold rolling, although the results of quality given are comparable.
- That the strip according to the invention is a valid alternative solution to the cold rolled silicon-based strips with non-oriented grains, when the applications do not require particular limits of the magnetic features, has been proved by means of experimental tests which have given the results listed in the following table 1. It will be noted that these experimental tests have been carried out on multi-layer packs obtained from a strip of the present invention, in other words hot rolled without additional treatments, which have been compared with similar packs obtained from a strip of the prior art, that has been cold rolled, annealed and skinpassed (1%).
- WIT e W1.5T are the magnetic losses in Watt/Kg of steel, measured respectively with a magnetic induction (polarization) of 1.0 and 1.5 Tesla in an alternate field at 50 Hz;
- B2500-B5000-
B 10000 are the magnetic induction values (polarization) in Tesla, measured with intensity of magnetic field H alternate at 50 Hz, of 2500, 5000, 10000 A/m, respectively. - Cycle 1: hot rolling + pickling + skinpassing
- Cycle 2: hot rolling + pickling + cold rolling (>70%) + annealing + skinpassing.
- Through observations of the results listed in the table it can be noted that the performances of the hot rolled strip according to the invention are fully comparable, under the aspect of the quality, with those of a strip according to the prior art further subjected to cold rolling, annealing and skinpassing treatment. The values of magnetic permeability which have been found are in fact fairly similar (highest difference: 0.6% at B10000), while the magnetic losses are even lower with the strip of the invention.
- It is also clear that the manufacturing of the steel according to the invention is more economical with respect to that of steel according to the prior art both for addition of less quantities of silicon and for the elimination of the cold rolling and annealing steps, as already remarked above. This saving can reach a value corresponding to about an amount of 15% of the total manufacturing costs.
- Another advantage of the steel according to the invention is that of avoiding the critical state of the traditional non-oriented grain silicon steel, the slabs of which must be heated at temperatures higher (by about 200°C) than requested by the other steels which do not include silicon and must be cooled more slowly with a controlled process before the subsequent rolling step to avoid cracks on the slab itself.
- Finally it is given in the following a typical example of chemical analysis of the strip according to the invention, when bearing in mind that it is not the case of a binding composition, except for the lower carbon and silicon content, as already mentioned before: C ≤ 0.06%, Mn 0.10-0.20%, Si < 0.03%, P ≤ 0,010%, S ≤ 0,005%, Cr ≤ 0.10%, Ni ≤ 0.12%, Mo ≤ 0.03%, Al 0.030±0.050%.
Claims (8)
- A hot rolled low carbon steel strip having a thickness comprised between 0.65 and 1.5 mm, particularly suitable to be used for the production of cold cut multilayer lamination packs for which a substantial parallelism, planarity and no burrs are required, characterized by the fact of having a silicon content < 0.03%, parallelism rate < 0.02 mm and fine grain structure with the 70% of the ferritic grains comprised between grades 9 and 12 of the ASTM E 112 standard.
- A steel strip according to claim 1, characterized by the fact of having at least the 80% of the ferritic grains with a lower size than that corresponding to grade 9 of said standard.
- A steel strip according to claim 1 or 2, characterized by the fact of having the thickness between 0.65 and 1 mm with tolerances corresponding to ± 0.05 mm.
- A steel strip according to claim 1 or 2, characterized by showing a parallelism rate < 0.01 mm.
- A steel strip according to one or more of the preceding claims, characterized by the fact of further showing a roughness ≥ 1.3 µm.
- A steel strip according to claims 4 and 5, characterized by a packing factor (P/P') ≥ 0.90.
- A steel strip according to claim 1 or 2, characterized by the fact of showing, after pickling and skinpassing, hardness values of HRB 55/70 or HV 110/140.
- A magnetic strip according to claim 1 or 2, having the following composition: C ≤ 0.06%, Mn 0.10÷0.20%, Si < 0.03%, P ≤ 0.010%, S ≤ 0.005%, Cr ≤ 0.10%, Ni ≤ 0.12%, Mo ≤ 0.03%, Al 0.030±0.050%.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04425877T ATE420214T1 (en) | 2004-11-24 | 2004-11-24 | HOT ROLLED MAGNETIC STEEL STRIP FOR PRODUCING STACKED MAGNETIC CORE SHEET |
PT04425877T PT1662010E (en) | 2004-11-24 | 2004-11-24 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
SI200431016T SI1662010T1 (en) | 2004-11-24 | 2004-11-24 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
ES04425877T ES2316949T3 (en) | 2004-11-24 | 2004-11-24 | HOT LAMINATED MEGNETIC STEEL SHEET PARTICULARLY ADEQUATE FOR THE MANUFACTURE OF ELECTROMAGNETIC SHEET PACKS. |
RSP-2009/0056A RS51272B (en) | 2004-11-24 | 2004-11-24 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
DE602004018942T DE602004018942D1 (en) | 2004-11-24 | 2004-11-24 | Hot-rolled magnetic steel strip for producing stacked magnetic core sheets |
EP04425877A EP1662010B1 (en) | 2004-11-24 | 2004-11-24 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
DK04425877T DK1662010T3 (en) | 2004-11-24 | 2004-11-24 | Magnetic hot-rolled steel, which is particularly suitable for the production of electromagnetic rolled packages |
PL04425877T PL1662010T3 (en) | 2004-11-24 | 2004-11-24 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
HR20090096T HRP20090096T3 (en) | 2004-11-24 | 2009-02-16 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04425877A EP1662010B1 (en) | 2004-11-24 | 2004-11-24 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1662010A1 true EP1662010A1 (en) | 2006-05-31 |
EP1662010B1 EP1662010B1 (en) | 2009-01-07 |
Family
ID=34932906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04425877A Revoked EP1662010B1 (en) | 2004-11-24 | 2004-11-24 | Magnetic hot rolled steel strip particularly suited for the production of electromagnetic lamination packs |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1662010B1 (en) |
AT (1) | ATE420214T1 (en) |
DE (1) | DE602004018942D1 (en) |
DK (1) | DK1662010T3 (en) |
ES (1) | ES2316949T3 (en) |
HR (1) | HRP20090096T3 (en) |
PL (1) | PL1662010T3 (en) |
PT (1) | PT1662010E (en) |
RS (1) | RS51272B (en) |
SI (1) | SI1662010T1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007086088A1 (en) * | 2006-01-26 | 2007-08-02 | Giovanni Arvedi | Hot rolled dual phase steel strip having features of a cold rolled strip |
WO2007086087A1 (en) * | 2006-01-26 | 2007-08-02 | Giovanni Arvedi | Hot steel strip particularly suited for the production of electromagnetic lamination packs |
WO2009012963A1 (en) * | 2007-07-21 | 2009-01-29 | Sms Siemag Ag | Process and device for producing strips of silicon steel or multiphase steel |
CN103028599A (en) * | 2012-05-25 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Production method for hot rolled ribbed steel bar steel wire rod |
WO2013051042A1 (en) | 2011-10-05 | 2013-04-11 | Centro Sviluppo Materiali S.Pa. | Process for the production of grain-oriented magnetic sheet with a high level of cold reduction |
JP2016047943A (en) * | 2014-08-27 | 2016-04-07 | Jfeスチール株式会社 | Non-oriented electromagnetic steel sheet and manufacturing method therefor |
CN107962075A (en) * | 2017-11-27 | 2018-04-27 | 武汉钢铁有限公司 | The cold rolling process of high grade non-oriented silicon steel hot rolling acid-cleaning not cutting edge |
CN109097535A (en) * | 2018-09-27 | 2018-12-28 | 长春工业大学 | A method of high-intensitive non-orientation silicon steel is prepared based on Processed by Accumulative Roll-bonding |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1192864A (en) * | 1997-09-19 | 1999-04-06 | Kawasaki Steel Corp | Hot rolled steel plate for working, having superfine grain, and its production |
JP2000273577A (en) * | 1999-03-19 | 2000-10-03 | Nkk Corp | High tensile strength hot rolled steel plate excellent in stretch-flanging workability and material stability and its production |
JP2001073096A (en) * | 1999-09-01 | 2001-03-21 | Sumitomo Metal Ind Ltd | Nonoriented silicon steel sheet for power steering motor, and its manufacture |
JP2001192788A (en) * | 2000-01-12 | 2001-07-17 | Sumitomo Metal Ind Ltd | Nonoriented silicon steel sheet excellent in workability, and its manufacturing method |
EP1170390A1 (en) * | 1999-09-28 | 2002-01-09 | Nkk Corporation | Hot-rolled steel sheet having high tensile strength and method for production thereof |
WO2004013365A1 (en) | 2002-08-06 | 2004-02-12 | Jfe Steel Corporation | Nonoriented magnetic steel sheet, member for rotary machine and rotary machine |
WO2004026497A1 (en) | 2002-09-19 | 2004-04-01 | Giovanni Arvedi | Process and production line for manufacturing ultrathin hot rolled strips based n the thin slab technique |
EP1411138A1 (en) | 2001-06-28 | 2004-04-21 | JFE Steel Corporation | Nonoriented electromagnetic steel sheet |
-
2004
- 2004-11-24 DE DE602004018942T patent/DE602004018942D1/en active Active
- 2004-11-24 PT PT04425877T patent/PT1662010E/en unknown
- 2004-11-24 SI SI200431016T patent/SI1662010T1/en unknown
- 2004-11-24 EP EP04425877A patent/EP1662010B1/en not_active Revoked
- 2004-11-24 PL PL04425877T patent/PL1662010T3/en unknown
- 2004-11-24 AT AT04425877T patent/ATE420214T1/en active
- 2004-11-24 DK DK04425877T patent/DK1662010T3/en active
- 2004-11-24 RS RSP-2009/0056A patent/RS51272B/en unknown
- 2004-11-24 ES ES04425877T patent/ES2316949T3/en active Active
-
2009
- 2009-02-16 HR HR20090096T patent/HRP20090096T3/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1192864A (en) * | 1997-09-19 | 1999-04-06 | Kawasaki Steel Corp | Hot rolled steel plate for working, having superfine grain, and its production |
JP2000273577A (en) * | 1999-03-19 | 2000-10-03 | Nkk Corp | High tensile strength hot rolled steel plate excellent in stretch-flanging workability and material stability and its production |
JP2001073096A (en) * | 1999-09-01 | 2001-03-21 | Sumitomo Metal Ind Ltd | Nonoriented silicon steel sheet for power steering motor, and its manufacture |
EP1170390A1 (en) * | 1999-09-28 | 2002-01-09 | Nkk Corporation | Hot-rolled steel sheet having high tensile strength and method for production thereof |
JP2001192788A (en) * | 2000-01-12 | 2001-07-17 | Sumitomo Metal Ind Ltd | Nonoriented silicon steel sheet excellent in workability, and its manufacturing method |
EP1411138A1 (en) | 2001-06-28 | 2004-04-21 | JFE Steel Corporation | Nonoriented electromagnetic steel sheet |
WO2004013365A1 (en) | 2002-08-06 | 2004-02-12 | Jfe Steel Corporation | Nonoriented magnetic steel sheet, member for rotary machine and rotary machine |
WO2004026497A1 (en) | 2002-09-19 | 2004-04-01 | Giovanni Arvedi | Process and production line for manufacturing ultrathin hot rolled strips based n the thin slab technique |
Non-Patent Citations (4)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 1999, no. 09 30 July 1999 (1999-07-30) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 13 5 February 2001 (2001-02-05) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 20 10 July 2001 (2001-07-10) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 24 11 May 2001 (2001-05-11) * |
Cited By (11)
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WO2007086088A1 (en) * | 2006-01-26 | 2007-08-02 | Giovanni Arvedi | Hot rolled dual phase steel strip having features of a cold rolled strip |
WO2007086087A1 (en) * | 2006-01-26 | 2007-08-02 | Giovanni Arvedi | Hot steel strip particularly suited for the production of electromagnetic lamination packs |
WO2009012963A1 (en) * | 2007-07-21 | 2009-01-29 | Sms Siemag Ag | Process and device for producing strips of silicon steel or multiphase steel |
US8137485B2 (en) | 2007-07-21 | 2012-03-20 | Sms Siemag Aktiengesellschaft | Process and device for producing strips of silicon steel or multiphase steel |
WO2013051042A1 (en) | 2011-10-05 | 2013-04-11 | Centro Sviluppo Materiali S.Pa. | Process for the production of grain-oriented magnetic sheet with a high level of cold reduction |
CN103028599A (en) * | 2012-05-25 | 2013-04-10 | 宝钢集团新疆八一钢铁有限公司 | Production method for hot rolled ribbed steel bar steel wire rod |
CN103028599B (en) * | 2012-05-25 | 2014-11-05 | 宝钢集团新疆八一钢铁有限公司 | Production method for hot rolled ribbed steel bar steel wire rod |
JP2016047943A (en) * | 2014-08-27 | 2016-04-07 | Jfeスチール株式会社 | Non-oriented electromagnetic steel sheet and manufacturing method therefor |
CN107962075A (en) * | 2017-11-27 | 2018-04-27 | 武汉钢铁有限公司 | The cold rolling process of high grade non-oriented silicon steel hot rolling acid-cleaning not cutting edge |
CN107962075B (en) * | 2017-11-27 | 2019-07-09 | 武汉钢铁有限公司 | The cold rolling process of high grade non-oriented silicon steel hot rolling acid-cleaning not cutting edge |
CN109097535A (en) * | 2018-09-27 | 2018-12-28 | 长春工业大学 | A method of high-intensitive non-orientation silicon steel is prepared based on Processed by Accumulative Roll-bonding |
Also Published As
Publication number | Publication date |
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PT1662010E (en) | 2009-03-03 |
RS51272B (en) | 2010-12-31 |
SI1662010T1 (en) | 2009-04-30 |
HRP20090096T3 (en) | 2009-05-31 |
DK1662010T3 (en) | 2009-04-27 |
ATE420214T1 (en) | 2009-01-15 |
EP1662010B1 (en) | 2009-01-07 |
PL1662010T3 (en) | 2009-06-30 |
DE602004018942D1 (en) | 2009-02-26 |
ES2316949T3 (en) | 2009-04-16 |
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