WO2008133337A1 - 一方向性電磁鋼板の製造方法 - Google Patents
一方向性電磁鋼板の製造方法 Download PDFInfo
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- WO2008133337A1 WO2008133337A1 PCT/JP2008/058229 JP2008058229W WO2008133337A1 WO 2008133337 A1 WO2008133337 A1 WO 2008133337A1 JP 2008058229 W JP2008058229 W JP 2008058229W WO 2008133337 A1 WO2008133337 A1 WO 2008133337A1
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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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
- B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls
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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
- C21D8/1233—Cold rolling
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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
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- H01F1/16—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 in the form of sheets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
- H01F41/024—Manufacturing of magnetic circuits made from deformed sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/36—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
Definitions
- the present invention relates to a method for producing a unidirectional electrical steel sheet used for an iron core of an electrical device such as a transformer / generator.
- the secondary recrystallized grains In order to produce such a unidirectional electrical steel sheet with excellent magnetic properties, the secondary recrystallized grains have ⁇ 1 1 0 ⁇ ⁇ 0 0 1> orientation (Goth orientation) during final finish annealing. It is necessary to form a secondary recrystallization texture that is highly integrated.
- Inhibitors generally have A 1 N, M n (S, Se), Cu 2 Use precipitates such as (S, S e), and additionally use grain boundary segregation-type elements such as Sn and S b (for example, Japanese Examined Patent Publication No. 4 6-2 3 8 2 0)
- Sn and S b for example, Japanese Examined Patent Publication No. 4 6-2 3 8 2 0
- Zenjima rolling mills represented by 21 type and 2 type 2 are the mainstream, and from the viewpoint of securing the rolling properties of thin steel sheets, 9 Small diameter work rolls with a diameter of 5 mm or less are used.
- Patent Document 8 describes an example using rolls of 80 m m ⁇ i and 90 m m ⁇ .
- Zenzimer rolling mills represented by 2 1 and 2 2 types are incorporated in a monoblock housing.
- the space inside the housing is fixed, so the roll diameter that can be inserted is limited when the roll is replaced.
- the space in the housing can be adjusted by moving the housing up and down.
- the diameter of the work roll can be changed according to the steel type and thickness of the steel plate and the rolling conditions. Recently, it is possible to use a single chrome of 95 mm ⁇ or more due to technological progress in equipment and operation and development of NMS mill.
- the technique proposed by the present applicant in Japanese Patent Application Laid-Open No. 2 0 0 1 — 1 9 2 7 3 2 is a unidirectional electrical steel sheet using a single crawler having a diameter of 9 5 to 1 7 ⁇ .
- the aim is to improve the magnetic properties of the steel, and it is not intended to improve productivity by taking advantage of the advantages of using a small-diameter crawl, that is, the properties under high pressure.
- Japanese Patent Application Laid-Open No. 2 0 2-1 2 9 2 3 4 discloses that the division is based on the “metallurgical discovery that the large diameter work roll effect of the class evening mill is effective in the first stage of the rolling pass”
- Disclosed is a technology for producing grain-oriented electrical steel sheets by rolling a former stage pass of rolling with a large-diameter work roll using a cluster mill composed of a mold housing, and then rearranging the latter stage pass into a small-diameter work roll and rolling. Therefore, a method of using a Otsuchi work roll in the first pass of pre-rolling is disclosed.
- the first pass which is intended to have a large thickness, is cold-rolled using a large-diameter roll, so that there are difficulties in rolling restrictions such as stagnation in the first pass.
- this invention manufactures the unidirectional electrical steel sheet which solves the said subject. It aims to provide a method.
- the present inventor has paid attention to the fact that, in a Zenzimer rolling mill configured with a split housing, the steel roll can be exchanged depending on the steel type, the steel plate condition of the plate thickness, and the rolling condition.
- the grain size of the grains is uniform, and the Goss-oriented crystal grains and the oriented crystal grains corresponding to the Goss orientation are rolled. We found that primary recrystallized structures aligned in the direction can be formed.
- the present invention has been made on the basis of the above findings, and the gist thereof is as follows.
- the first cold rolling or the first and second cold rolling is performed using a small diameter work roll having a diameter of 55 to 105 mm,
- the diameter of the small diameter single crawl used in the final cold rolling is 55 ⁇ : L 0 5 mm or less, wherein one of the above (1) to (3) A method for producing grain-oriented electrical steel sheets.
- aging treatment is carried out at 100 to 35 ° C. for 1 minute or more between rollings.
- the manufacturing method of the unidirectional electromagnetic steel plate in any one of (4).
- Fig. 1 is a diagram showing the structure of a Sendzima rolling mill.
- A shows the structure built into a monoblock housing
- (b) shows the structure built into a split housing.
- FIG. 2 shows the relationship between the diameter of a single crawl and the rolling load.
- FIG. 3 is a diagram showing a change in rolling reaction force when a small-diameter work piece is used in one pass and a large-diameter work roll is used in an intermediate pass of 2 to 5 passes.
- Figure 4 shows the relationship between work roll diameter (mm) and magnetic flux density B8. It is a figure.
- Fig. 5 is a graph showing the relationship between the rotation angle around the ND axis, the Goth azimuth strength (IN), and the ⁇ 9 corresponding orientation strength (Ic ⁇ 9).
- Figure 6 shows the relationship between the work roll diameter (mm) and the magnetic flux density B8.
- the present inventor by mass%, C: 0.05%, Si: 3.3%, Mn: 0.1%, S: 0.07%, A1: 0.02 8
- An electromagnetic steel slab containing 2%, N: 0.0 0 70% and Sn: 0.07% was heated to 1 15 ° C. and hot rolled 1.
- An 8 mm thick hot-rolled sheet was annealed at 1 100 and then cold-rolled with a split housing type cluster one-type reverse rolling mill at a rolling count of 6 and a total rolling reduction of 90%. 0.1 8 mm steel plate was produced. Note that an aging treatment at 20 ° C. for 5 minutes was appropriately performed between the rollings.
- the diameter of the work roll used in the first cold rolling (hereinafter sometimes referred to as “one pass”) and the final cold rolling (hereinafter sometimes referred to as “final pass”) is 6 5 to 9
- the rolling load was measured in the range of 7 mm.
- measure the rolling load by changing the diameter of the work roll used in the second and subsequent cold rolling (except for the final pass) (hereinafter sometimes referred to as “intermediate pass”) in the range of 95 to 180 mm. did.
- the pass schedule was the same. The results are shown in Figure 2.
- the critical rolling reduction is defined for each condition such as the plate thickness and plate temperature of each pass.
- a small-diameter work roll with a diameter of 65 mm is used in one pass, and a large-diameter work roll with a diameter of 100 mm is used in an intermediate pass of 2 to 5 passes.
- the final pass (6 passes) the change in rolling reaction force when using a small diameter work roll with a diameter of 60 mm is shown.
- This allowable rolling load differs depending on the diameter of the work roll, but as shown in Fig. 3, the allowable rolling load can be greatly reduced by selecting the diameter of the small diameter work roll and the large diameter work roll as appropriate. . As a result, the number of passes required for rolling to the required plate thickness can be reduced, and the steel plate can be prevented from breaking, so that productivity can be significantly increased.
- Fig. 4 shows the magnetic flux density B8 [T] of a 0.23 mm thick magnetic steel sheet rolled by a small diameter work roll with a diameter of 50-60 mm and a diameter of 110 mm to 120 mm.
- the magnetic flux density B 8 [T] is shown for a 0.23 mm thick magnetic steel sheet produced by rolling with a large diameter work roll.
- the top is the magnetic flux density when high-temperature rolling is performed using processing heat generation, and the bottom is the magnetic flux density when normal rolling without aging treatment is performed.
- the magnetic flux density B 8 [T] does not improve even if the small diameter work roll is replaced with the large diameter work roll. However, if high temperature rolling is performed using the large diameter work roll, the magnetic flux density B 8 [T] It can be seen that it improves. In the initial rolling pass (1 pass, 2 passes), the steel sheet temperature is not sufficiently raised, so the effect of improving the magnetic flux density obtained by using a large diameter work roll cannot be expected.
- a small diameter work roll is used in the initial pass of rolling, and rolling is performed under high pressure under a low rolling load, and a large diameter work roll is used in the intermediate pass as appropriate.
- the basic idea is to improve the magnetic flux density by combining the effects of aging treatment due to processing heat generation.
- the final pass of cold rolling the cold rolled steel sheet is further reduced by using a small diameter single crawl to obtain the required product thickness.
- the rolling pass schedule is configured by using the small-diameter work roll and the large-diameter work mouth separately on the basis of the effects of the small-diameter single crawl and the large-diameter work roll. This is a feature of the present invention.
- the present inventor has confirmed that the magnetic flux density is improved by employing a large-diameter monochromal in the intermediate pass, as follows, histologically as follows: Thickness after primary recrystallization annealing 50 Specimens were taken from the thickness 1 / 5t (t: thickness) of the steel plate of mm and 110 mm, and analyzed by X-ray analysis.
- the SGH method Harasei et al .: The Japan Institute of Metals, Vol. 29, Volume 9 According to the 7th issue P 5 5 2 2
- the strength of Goss azimuth around ND axis (IN) and the strength of ⁇ 9 corresponding azimuth (Ic ⁇ 9) were analyzed. The results are shown in Fig. 5.
- the conditions that the primary recrystallization texture should have are (i) a large number of Goth orientations, and (ii) a preferential growth of the Goth orientation. 9
- the corresponding orientation is sharp. Therefore, it can be seen from FIG. 5 that a primary recrystallization texture suitable for increasing the goss accumulation degree of secondary recrystallization is sufficiently formed by using a large-diameter soot crawl in the intermediate pass. I understand.
- a 1 N has a strong inhibitory action and is thermally stable compared to M n S (n Se), so even if hot rolling using a large diameter single crawl is performed in the intermediate pass It is presumed that the primary recrystallization texture effectively exhibits the effect of improving the magnetic flux density.
- Sharpening this texture is effective in increasing the magnetic flux density. Therefore, from the viewpoint of improving productivity, in the present invention in which a small diameter single crawl is used in the initial rolling pass (1 pass, or 1 pass and 2 passes), a large diameter work roll is used in the intermediate pass,
- the texture after the primary recrystallization is a sharp texture preferable for improving the magnetic flux density.
- a 1 is an essential element as an inhibitor component. In order to secure the required amount of inhibitor and obtain a high magnetic flux density, 0.07% or more is necessary. On the other hand, if the amount is too large, the slab heating time required for the solution treatment becomes longer and the productivity decreases, so the upper limit is set to 0.040%.
- the electromagnetic steel slab is heated at a high temperature, it is necessary to perform annealing before the final cold rolling to form A 1 N. It is necessary to contain about 0.03 to 0.020%.
- the content of N in the electromagnetic steel slab is not particularly limited.
- C is an important element for forming austenite, and is required to be 0.025% or more. However, if too much, decarburization becomes difficult, so the upper limit is set to 0.1%.
- S i needs to be 2.5% or more in order to secure a predetermined electric resistance and obtain good iron loss characteristics.
- the upper limit is set to 4.5%.
- M n is an element mixed as an inevitable component, but has the effect of increasing toughness, so is added in an amount of 0.03% or more. On the other hand, if too much, A large amount of MnS or MnSe is generated, and it is difficult to form a solution even with high-temperature slab heating.
- S, S e combine with M n to form M n S or M n Se for use as an inhibitor, so depending on the type of inhibitor used, , Added.
- the addition amount is preferably 0.01 to 0.04% in both cases of single use and combined use.
- Sn, Sb, Cu, Ni, Cr, P, V, B, Bi, Mo, Nb, and Ge may be added in an appropriate amount as long as the mechanical properties and surface properties of the steel sheet are not impaired.
- the electromagnetic steel slab of the present invention may be manufactured by a known manufacturing method.
- the size and shape of the electromagnetic steel slab are adjusted as necessary, and then heated in a heating furnace at 1100 to 1450 ° C for hot rolling.
- the heating furnace may be a normal gas heating furnace, an induction furnace, or an electric heating furnace.
- cold rolling After hot rolling the steel slabs at 1 1 0 0 to 1 4 5 0 to obtain hot-rolled steel sheets of the required thickness, and annealing them, using a split housing type cluster-type levers rolling mill, Multiple cold rolling is applied.
- an aging treatment may be performed between the rollings.
- heat generated by processing may be used, or other heating means may be used.
- the temperature and time of the aging treatment may be appropriately selected within a known temperature and time range. It is preferably 0 to 3500 ° C for 1 minute or longer.
- the cold-rolled steel sheet may be annealed as necessary under known conditions. If high-temperature slab heating is assumed, this annealing is an essential process for finely depositing a sufficient amount of A 1 N (inhibition) in the steel sheet.
- annealing for A 1 N precipitation is not required, but carbide precipitation and solid solution C solid solution forms that make the aging treatment appropriately performed between passes more effective. In order to achieve this, annealing may be performed before the final cold rolling.
- the cold-rolled steel sheet is subjected to cold rolling with a split-type housing-type class evening type revers rolling machine.
- a split-type housing-type class evening type revers rolling machine In order to finally form a secondary recrystallization texture in which the Goss orientation is highly accumulated and to obtain a high magnetic flux density, it is preferable to perform cold rolling at a total rolling reduction of 81% or more.
- the present invention is characterized in that the pass schedule is configured by using the small-diameter work roll and the large-diameter work roll separately based on the action effect of the small-diameter steel crawl and the large-diameter steel crawl. That is, the basic technical idea is to incorporate the different effects of the small diameter work roll and the large diameter work roll into the manufacturing process of the electrical steel sheet.
- the present invention is characterized by using a split type housing type cluster type lever rolling mill (see FIG. 1 (b)).
- the diameter of the work roll can be changed by exchanging the intermediate port, but the changeable range is as small as about 10 mm. The work required is heavy.
- the diameter of the work roll can be changed by raising and lowering the upper and lower housings and adjusting the distance between the pores.
- the work roll can be replaced quickly during rolling, and productivity is not hindered.
- the split housing type cluster-type levers rolling mill is a 6-fold, 1-double or 20-fold roll from the viewpoint of stably performing high-temperature rolling in the intermediate pass and sheet rolling in the final pass.
- Machine such as Sendzimir mill and NMS mill.
- the diameter of the small diameter work roll used for rolling under high pressure with a low rolling load at the initial stage of rolling, and the small diameter single crawl used for further reducing the cold-rolled steel sheet in the final pass is the large diameter used in the intermediate pass. Although it must be smaller than the diameter of a single crawl, the diameter of the small diameter work roll should be less than 55 to 105 mm in consideration of the knowledge shown in Fig. 2 and Fig. 3.
- the diameter of the small diameter work roll should be at least 55 mm.
- the diameter is 105 mm or more, the effect of improving the critical reduction is reduced, and the advantage of using a small-diameter nozzle is lost, so the diameter of the first crawl in the first and final cold rolling
- the upper limit of the workpiece is less than 105 mm.
- the diameter of the work roll in the first and final cold rolling should be 70 to 95 mm is preferable.
- the diameter of a single crawl used in the second pass or the intermediate pass after 3 passes is In order to ensure excellent magnetic properties, it must be larger than the diameter of the work roll in the first and final cold rolling. Therefore, the diameter of the work roll should be 10 mm or more.
- Figure 6 shows the relationship between the diameter of the single crawl used in the intermediate path and the magnetic flux density B8 [T].
- the diameter of the work roll used in the second pass or the intermediate pass after the third pass is 105 mm or more, effective high-temperature rolling can be performed, and a high magnetic flux density directional current can be obtained.
- Magnetic flux density of 1.93 T or more required for magnetic steel sheets can be secured.
- the magnetic flux density tends to saturate at a diameter of 150 mm or more.
- the upper limit of the diameter of the single crawl used in the second pass or the intermediate pass after the third pass should be less than 150 mm.
- the diameter of the work roll used in the second pass or the intermediate pass after the third pass should be less than 105-150 mm.
- the magnetic flux density of 1.93 is surely obtained, and the handling characteristics of the rolling mill From the viewpoint, it is preferably less than 1 15 to 1550 mm.
- a cold-rolled steel sheet is further rolled to the required product plate thickness using a small-diameter work roll, but by selecting the diameter of the small-diameter work hole, 0.18 mm Product thickness can be reduced to:
- the diameter of the small diameter work roll used in the final pass should be smaller than the diameter of the work roll used in the intermediate pass after the second pass or the third pass.
- 5 5 to less than 10 5 mm is preferable.
- the number of passes in cold rolling is small from the viewpoint of productivity.
- the number of passes is preferably 3 or more and 7 or less.
- the steel sheet after final rolling is degreased and then annealed for both decarburization and primary recrystallization.
- the temperature at which the electrical steel slab is heated is below 1250 ° C (low temperature slab heating)
- nitriding is performed between the primary recrystallization and the secondary recrystallization to form A 1 N that functions as an inhibitor .
- the nitriding treatment is performed in the middle of finish annealing (refer to Japanese Patent Application Laid-Open No. Sho 60-0 1 79 8 85) or by annealing in a mixed gas of “hydrogen + nitrogen + ammonia” while running the steel plate. (See Japanese Laid-Open Patent Publication No. 8 2 3 93).
- the amount of nitrogen is required to be 120 ppm or more, preferably 1550 ppm or more. Further, controlling the primary recrystallized grain size further improves the magnetic properties (see Japanese Patent Application Laid-Open No. 1 8 2 9 39).
- an annealing separator mainly composed of MgO slurry is applied to the steel sheet, and then it is wound into a coil and subjected to final finishing annealing. After that, if necessary, an insulating coating is applied. However, if the magnetic domain fragmentation is performed by laser, plasma, mechanical method, etching, or other methods, the magnetic properties are improved.
- the conditions of the examples are one example of conditions adopted to confirm the feasibility and effects of the present invention, and the present invention is based on this one example of conditions. It is not limited.
- Electromagnetic steel slabs with composition shown in Table 1 a ⁇ : f is heated at the slab heating temperature shown in Table 2 and hot-rolled to a hot rolled sheet with a thickness of 2.0 ⁇ 2.8 mm It was.
- Table 2 a, b, and c are for high-temperature slab heating, and d, e, and: f are for low-temperature slab heating.
- the hot-rolled sheets shown in Table 2 were cold-rolled under the rolling conditions shown in Table 3 using a split housing cluster-type lever rolling mill.
- an aging treatment was performed for 1 minute or more between 20 00 and 3500 using processing heat generated between passes.
- the obtained cold-rolled sheet is decarburized and annealed by the usual method, and magnesia is applied by the usual method, and finish annealing, insulation coating, shape correction and baking annealing are performed to obtain a product steel plate.
- B 8 was measured.
- magnetic domain control was performed on the product steel plate by a mechanical method, and the iron loss (W17 / 50) was measured. The results are also shown in Table 3.
- the comparative example of category a is an example in which the diameter of the small diameter work roll is 50 mm and the lower limit specified by the present invention is 55 mm or less, and rolling was not possible.
- the diameter of the small work roll is 54 mm and the lower limit specified by the present invention is 55 mm or less, and the diameter of the large work roll is 95 mm, specified by the present invention. This is an example of a lower limit of 105 mm or less.
- the diameter of the small-diameter work roll is 110 mm, which exceeds the upper limit of less than 105 mm specified in the present invention, and the diameter of the large-diameter work piece is 150 mm. This is an example exceeding the upper limit of less than 1550 mm specified in the present invention. Since both crawls have a large diameter, it takes time to handle the rolling mill and this is an example of reduced productivity.
- the diameter of the small diameter work roll is 109 mm, which exceeds the upper limit of less than 105 mm specified in the present invention. As a result, the number of passes increases, resulting in decreased productivity. It is. 08058229 Table 1
- the plate thickness can be reduced without reducing the productivity.
- the present invention greatly contributes to low iron loss, miniaturization, and weight reduction of electrical equipment such as transformers and generators, and is highly applicable in the electrical equipment manufacturing industry.
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- Manufacturing Of Steel Electrode Plates (AREA)
- Metal Rolling (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/450,996 US8236110B2 (en) | 2007-04-24 | 2008-04-22 | Method of producing grain-oriented electrical steel sheet |
EP08740914.0A EP2140949B1 (en) | 2007-04-24 | 2008-04-22 | Process for producing unidirectionally grain oriented electromagnetic steel sheet |
PL08740914T PL2140949T3 (pl) | 2007-04-24 | 2008-04-22 | Sposób wytwarzania blachy cienkiej ze stali elektrotechnicznej o ziarnach zorientowanych jednokierunkowo |
KR1020097017729A KR101120125B1 (ko) | 2007-04-24 | 2008-04-22 | 일방향성 전자강판의 제조 방법 |
JP2009511922A JP5392076B2 (ja) | 2007-04-24 | 2008-04-22 | 一方向性電磁鋼板の製造方法 |
CN2008800133947A CN101668596B (zh) | 2007-04-24 | 2008-04-22 | 单向性电磁钢板的制造方法 |
BRPI0810570-7A BRPI0810570A2 (pt) | 2007-04-24 | 2008-04-22 | método de produção de chapa de aço elétrico com grão orientado |
Applications Claiming Priority (2)
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JP2007-114255 | 2007-04-24 | ||
JP2007114255 | 2007-04-24 |
Publications (1)
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WO2008133337A1 true WO2008133337A1 (ja) | 2008-11-06 |
Family
ID=39925781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2008/058229 WO2008133337A1 (ja) | 2007-04-24 | 2008-04-22 | 一方向性電磁鋼板の製造方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US8236110B2 (ja) |
EP (1) | EP2140949B1 (ja) |
JP (1) | JP5392076B2 (ja) |
KR (1) | KR101120125B1 (ja) |
CN (1) | CN101668596B (ja) |
BR (1) | BRPI0810570A2 (ja) |
PL (1) | PL2140949T3 (ja) |
RU (1) | RU2411092C1 (ja) |
WO (1) | WO2008133337A1 (ja) |
Cited By (1)
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JP2016047966A (ja) * | 2015-12-07 | 2016-04-07 | 新日鐵住金株式会社 | 高Si含有の方向性電磁鋼板の冷間圧延方法 |
Families Citing this family (4)
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CN102639742B (zh) * | 2009-11-18 | 2016-03-30 | 新日铁住金株式会社 | 奥氏体系不锈钢板及其制造方法 |
RU2769149C1 (ru) * | 2018-09-28 | 2022-03-28 | ДжФЕ СТИЛ КОРПОРЕЙШН | Способ изготовления листа из текстурированной электротехнической стали и стан холодной прокатки |
CN109468438A (zh) * | 2018-12-21 | 2019-03-15 | 武汉万实新能源科技股份有限公司 | 一种硅钢极薄带生产方法 |
KR102405173B1 (ko) * | 2019-12-20 | 2022-06-02 | 주식회사 포스코 | 방향성 전기강판 및 그의 제조방법 |
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- 2008-04-22 PL PL08740914T patent/PL2140949T3/pl unknown
- 2008-04-22 EP EP08740914.0A patent/EP2140949B1/en active Active
- 2008-04-22 JP JP2009511922A patent/JP5392076B2/ja active Active
- 2008-04-22 KR KR1020097017729A patent/KR101120125B1/ko active IP Right Grant
- 2008-04-22 CN CN2008800133947A patent/CN101668596B/zh active Active
- 2008-04-22 US US12/450,996 patent/US8236110B2/en active Active
- 2008-04-22 WO PCT/JP2008/058229 patent/WO2008133337A1/ja active Application Filing
- 2008-04-22 RU RU2009143317/02A patent/RU2411092C1/ru active
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2016047966A (ja) * | 2015-12-07 | 2016-04-07 | 新日鐵住金株式会社 | 高Si含有の方向性電磁鋼板の冷間圧延方法 |
Also Published As
Publication number | Publication date |
---|---|
KR101120125B1 (ko) | 2012-03-22 |
BRPI0810570A2 (pt) | 2011-11-08 |
US8236110B2 (en) | 2012-08-07 |
PL2140949T3 (pl) | 2017-10-31 |
US20100084058A1 (en) | 2010-04-08 |
EP2140949A1 (en) | 2010-01-06 |
RU2411092C1 (ru) | 2011-02-10 |
KR20090114413A (ko) | 2009-11-03 |
JP5392076B2 (ja) | 2014-01-22 |
JPWO2008133337A1 (ja) | 2010-07-29 |
CN101668596A (zh) | 2010-03-10 |
EP2140949B1 (en) | 2017-05-31 |
EP2140949A4 (en) | 2016-07-13 |
CN101668596B (zh) | 2012-09-26 |
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