WO2011111862A1 - 方向性電磁鋼板の製造方法 - Google Patents
方向性電磁鋼板の製造方法 Download PDFInfo
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- WO2011111862A1 WO2011111862A1 PCT/JP2011/056127 JP2011056127W WO2011111862A1 WO 2011111862 A1 WO2011111862 A1 WO 2011111862A1 JP 2011056127 W JP2011056127 W JP 2011056127W WO 2011111862 A1 WO2011111862 A1 WO 2011111862A1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910000976 Electrical steel Inorganic materials 0.000 title abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- 238000005098 hot rolling Methods 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000000137 annealing Methods 0.000 claims description 29
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims description 17
- 238000005097 cold rolling Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052787 antimony Inorganic materials 0.000 claims description 6
- 229910052797 bismuth Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052714 tellurium Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 38
- 239000003112 inhibitor Substances 0.000 description 33
- 229910052742 iron Inorganic materials 0.000 description 18
- 238000001953 recrystallisation Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- 238000001556 precipitation Methods 0.000 description 8
- 230000002401 inhibitory effect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
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- 230000006866 deterioration Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- -1 MnS Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 230000002542 deteriorative effect Effects 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003346 selenoethers Chemical class 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D8/1261—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 following 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
- 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
- C21D8/1266—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 between cold rolling steps
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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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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- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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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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- 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
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/05—Grain orientation
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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
- C21D8/1255—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 with diffusion of elements, e.g. decarburising, nitriding
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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
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
Definitions
- the present invention relates to a method for producing a grain oriented electrical steel sheet.
- the present invention particularly relates to a method for producing a directional electrical steel sheet having a low magnetic loss and a high magnetic flux density over the entire length of the coil.
- Oriented electrical steel sheets are mainly used in a wide range as iron core materials for transformers and electrical equipment, and are required to have excellent magnetic properties such as low iron loss and high magnetic flux density.
- This grain-oriented electrical steel sheet is generally manufactured by the following process. That is, a slab having a thickness of 100 to 300 mm controlled to a predetermined component composition is heated to a temperature of 1250 ° C. or higher and then hot-rolled, and the obtained hot-rolled sheet is hot-rolled as necessary. Apply annealing. Thereafter, the cold rolled sheet or the hot rolled annealed sheet is subjected to one cold rolling or two or more cold rolling sandwiching intermediate annealing to obtain a cold rolled sheet having a final thickness. Thereafter, the cold-rolled sheet is subjected to decarburization annealing, and an annealing separator is applied to the surface of the steel sheet, followed by a final annealing for the purpose of secondary recrystallization and purification.
- the general manufacturing method of a grain-oriented electrical steel sheet is to obtain desired magnetic characteristics by the following processing.
- the inhibitor component inhibitor-forming element
- the resulting primary recrystallized structure is appropriately controlled by hot rolling the slab and further performing one or more cold rollings and one or more annealings.
- the primary recrystallized grains are secondarily recrystallized into crystal grains of ⁇ 110 ⁇ ⁇ 001> orientation (Goss orientation) by finish annealing.
- a dispersed phase called an inhibitor is used in the steel. It is important to control the precipitation state so that it is dispersed in a uniform and appropriate size. It is important that the primary recrystallized structure has an appropriate size of crystal grains and a uniform distribution over the entire plate thickness.
- inhibitors substances having extremely low solubility in steel such as sulfides, selenides and nitrides such as MnS, MnSe, AlN and VN are used.
- grain boundary segregation elements such as Sb, Sn, As, Pb, Ce, Te, Bi, Cu, and Mo are also used as inhibitors.
- Sb, Sn, As, Pb, Ce, Te, Bi, Cu, and Mo are also used as inhibitors.
- the finish rolling finish temperature of hot rolling is set in the range of 900 to 1100 ° C., and cooling for 2 to 6 seconds after the finish rolling is finished is expressed by the following formula (1): T (t) ⁇ FDT- (FDT-700) ⁇ t / 6 (1)
- T (t) steel plate temperature (° C.)
- FDT finish rolling finish temperature (° C.)
- t elapsed time from finish of hot rolling finish rolling (second) Is processed so as to satisfy the above, and is wound at 700 ° C. or lower.
- Patent Document 1 appropriately controls the upper limit temperature of the steel sheet in the cooling process from finish rolling to winding, and prevents the undesirable inhibitor precipitation state, thereby reducing the secondary recrystallization defect rate. It is a technology that achieves high magnetic flux density and low iron loss. This technology contributes to stabilizing the quality of grain-oriented electrical steel sheets. However, even if this technique is fully utilized, the magnetic properties, particularly the iron loss characteristics, at the tip portion in hot rolling, particularly at the portion corresponding to 5 to 10% of the length of the entire length of the coil, are smaller than those at the coil center portion. There was a tendency to be inferior by about 10%, and it was left as a quality problem to be solved.
- the present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to propose an advantageous manufacturing method capable of obtaining a grain-oriented electrical steel sheet having excellent magnetic properties over the entire length of the coil. .
- the inventors have conducted an intensive investigation focusing on the manufacturing history in the longitudinal direction of the hot rolled coil. As a result, the following was confirmed.
- batch-type hot rolling that is, hot rolling in which one coil is rolled at a time
- the plate thickness of the coil tip is 10% from the target plate thickness even in the present situation where the computer is used for highly predictive control. It is often off by about%.
- the coil tip is rolled at a low speed until the coil tip is wound around the coiler, it is often overcooled and overcooled compared to the coil center that is rolled at high speed.
- the present invention is C: 0.01-0.10 mass%, Si: 2.5-4.5 mass%, Mn: 0.02-0.12 mass%, Al: 0.005-0.10 mass%, Steel containing N: 0.004 to 0.015 mass%, and further containing one or two selected from Se: 0.005 to 0.06 mass% and S: 0.005 to 0.06 mass% After the slab is heated to a temperature of 1280 ° C.
- T (t) steel plate temperature (° C.)
- FDT finish rolling finish temperature (° C.)
- t elapsed time from finish finish (seconds)
- the steel sheet temperature after 3 seconds from the end of hot rolling is controlled to be 650 ° C. or more. Is the method.
- the steel slab may further include Cu: 0.01 to 0.15 mass%, Sn: 0.01 to 0.15 mass%, and Sb: One or two selected from 0.005 to 0.1 mass%, Mo: 0.005 to 0.1 mass%, Te: 0.005 to 0.1 mass%, and Bi: 0.005 to 0.1 mass% It contains the above, It is characterized by the above-mentioned. That is, the composition of the steel slab used in the present invention is summarized as follows: C: 0.01 to 0.10 mass%, Si: 2.5 to 4.5 mass%, Mn: 0.02 to 0.12 mass%, Al: 0.
- N 0.004 to 0.015 mass%
- at least one selected from Se: 0.005 to 0.06 mass% and S: 0.005 to 0.06 mass% Contains seeds, or Cu: 0.01 to 0.15 mass%, Sn: 0.01 to 0.15 mass%, Sb: 0.005 to 0.1 mass%, Mo: 0.005 to 0.1 mass% Te: 0.005 to 0.1 mass% and Bi: 0.005 to 0.1 mass%, at least one selected from among them, preferably the balance is iron and inevitable impurities.
- the magnetic properties are reduced at the hot-rolling tip portion in the coil longitudinal direction that the prior art has.
- the problem can be solved. Therefore, it becomes possible to produce a grain-oriented electrical steel sheet having excellent magnetic properties over the entire length of the coil.
- FIG. 1 shows the effect on the iron loss difference between the hot rolled coil tip and the coil center, the time spent at 650 ° C or higher after the hot finish rolling (horizontal axis: seconds) and the thickness variation (vertical axis: gauge) It is the graph which showed the influence of deviation rate (%).
- FIG. 2 is a graph (vertical axis: steel plate temperature (° C.), horizontal axis: elapsed time (seconds) after finish rolling) showing the temperature control range of the hot rolled coil tip in the present invention.
- the manufacturing method of the directional hot-rolled steel sheet of this invention is demonstrated.
- the production method of the present invention is characterized by optimizing the cooling conditions after the end of hot rolling, and there is no particular limitation other than controlling the cooling conditions after hot rolling to an appropriate range described later. Absent. Therefore, other manufacturing processes, for example, steel manufacturing, hot rolling, hot-rolled sheet annealing, pickling, intermediate annealing, cold rolling, decarburization annealing, annealing separator coating and finish annealing, etc. About conditions, what is necessary is just to follow according to a well-known method, respectively.
- the plate thickness of the coil tip often deviates from the target plate thickness by about 10%. Further, since the coil tip is rolled at a low speed until the coil tip is wound around the coiler, it has been confirmed that the coil tip is often in an overcooled state as compared with the coil central portion to be rolled at a high speed.
- the coil thickness variation at the coil tip is larger than ⁇ 5%, and after finishing rolling, it is cooled to less than 650 ° C. early and stays at a temperature of 650 ° C. or more. It was newly found that the coil loss time is less than 3 seconds and the iron loss difference between the coil tip and the center is large (that is, the iron loss at the tip is greatly deteriorated).
- FIG. 1 the coil loss time is less than 3 seconds and the iron loss difference between the coil tip and the center is large (that is, the iron loss at the tip is greatly deteriorated).
- the plate thickness fluctuation amount was evaluated by the plate thickness deviation rate (gauge deviation rate) with respect to the target plate thickness (target value of the average value in the center in the coil longitudinal direction) defined in the examples described later.
- the time after finishing rolling starts from the time when the steel sheet leaves the final rolling roll of the finishing mill.
- the target thickness of hot rolling is set to an optimum value in consideration of the influence of the reduction ratio in cold rolling on the subsequent steel sheet structure. That is, even if the plate thickness is thicker than the target value, even if the plate thickness is reduced, it deviates from the appropriate cold rolling reduction ratio, so that the magnetic characteristics tend to decrease.
- the temperature of the steel plate is less than 650 ° C., and therefore the time for staying at a temperature of 650 ° C. or more is less than 3 seconds.
- the deterioration of the iron loss is increased when the conditions are greatly deviated from the target plate thickness and the cold rolling reduction ratio is deviated from the appropriate range.
- the present invention prevents the deterioration of the magnetic characteristics of the hot rolled coil tip by the following method.
- the upper limit temperature of the steel sheet temperature of the entire length of the coil during cooling after completion of hot finish rolling is the following equation (1); T (t) ⁇ FDT- (FDT-700) ⁇ t / 6 (1)
- T (t) steel plate temperature (° C.)
- FDT finish rolling finish temperature (° C.)
- t elapsed time from finish finish (seconds) To satisfy.
- tip part (10% length part of a coil full length) of a hot-rolled coil is made so that the steel plate temperature after 3 second after completion
- the reason why the steel sheet temperature history during cooling needs to satisfy the above formula (1) is that when the steel sheet temperature deviates from the above formula (1) and changes in a high temperature region, the precipitation form of AlN, MnSe, and MnS changes. As a result, an unfavorable inhibitor with no suppressive force is deposited, resulting in an increase in the incidence of secondary recrystallization failure. As a result, the iron loss increases and the magnetic flux density decreases, resulting in deterioration of magnetic properties. It is to do. That is, this equation (1) needs to be satisfied not only at the tip of the hot rolled coil but also over the entire length of the hot rolled coil. In addition, from the viewpoint of preventing the inhibitor from becoming excessively coarse, the steel plate temperature 3 seconds after the end of hot rolling is preferably 800 ° C. or less.
- the reason why it is necessary to cool the steel plate after 3 seconds from the end of hot rolling so that the steel plate temperature becomes 650 ° C. or more, that is, the steel plate temperature after the end of hot rolling needs to be maintained at 650 ° C. or more for 3 seconds is as described above.
- the extension coil may be held over the entire length.
- the cooling condition of the coil tip after 3 seconds There is no particular lower limit on the cooling condition of the coil tip after 3 seconds.
- the thickness of the coil tip in batch type hot rolling may deviate up to about ⁇ 20% depending on the coil. Even in such a case, the magnetic thickness can be maintained by holding at 650 ° C. or more for 3 seconds or more. Characteristics can be maintained.
- Patent Document 1 Although the conventional techniques such as Patent Document 1 are studying the influence of cooling conditions after hot rolling on the precipitation behavior of the inhibitor, it is not possible to identify the site where the manufacturing conditions are stable, such as the central part in the longitudinal direction of the coil. This is merely an assumed study, and no consideration has been given to the precipitation behavior or dynamic recrystallization behavior of the inhibitor in the unsteady portion such as the hot rolled coil tip.
- the present invention is significant in that it focuses on the unsteady portion at the tip of the hot-rolled coil and proposes a method for preventing the deterioration of magnetic characteristics, which is a phenomenon peculiar to this portion.
- the slab heating temperature before hot rolling is preferably heated to a temperature of 1280 ° C. or higher because it is necessary to sufficiently dissolve the inhibitor component.
- the finish rolling finish temperature in hot rolling is preferably 900 to 1100 ° C.
- the coiling temperature after hot rolling is preferably 650 ° C. or less.
- the grain-oriented electrical steel sheet suitable for the production method of the present invention needs to be a composite addition of AlN, MnSe, and MnS as an inhibitor, and the component composition to be included is as follows.
- C 0.01-0.10 mass%
- C is an element useful not only for uniform refinement of the structure during hot rolling and cold rolling, but also for the development of Goss orientation, and at least 0.01 mass% must be contained in the slab stage.
- the upper limit is made 0.10 mass%.
- the lower limit of the preferred C content is 0.03 mass%.
- a preferable upper limit is 0.08 mass%.
- the amount of C after finish annealing shall be 0.004 mass% or less.
- Si 2.5 to 4.5 mass% Si is an essential element that increases the specific resistance of the steel sheet and contributes to the reduction of iron loss. If the Si content is less than 2.5 mass%, the iron loss reduction effect is not sufficient, and randomization of crystal orientation by ⁇ - ⁇ transformation in finish annealing at a high temperature for secondary recrystallization and purification. As a result, sufficient magnetic properties cannot be obtained. On the other hand, when it exceeds 4.5 mass%, the cold rolling property is impaired, and it becomes difficult to manufacture. Therefore, the Si content is in the range of 2.5 to 4.5 mass%. A preferred lower limit is 3.0 mass%. A preferable upper limit is 3.5 mass%.
- Mn 0.02 to 0.12 mass%
- Mn is an element effective for preventing cracking during hot rolling due to S, but if it is less than 0.02 mass%, the effect cannot be obtained. On the other hand, if added over 0.12 mass%, the magnetic properties deteriorate. Therefore, the Mn content is in the range of 0.02 to 0.12 mass%. A preferred lower limit is 0.05 mass%. A preferable upper limit is 0.10 mass%.
- Al 0.005 to 0.10 mass%
- Al is an element that acts as an inhibitor by forming N and AlN. If the Al content is less than 0.005 mass%, the inhibitory power as an inhibitor is not sufficient, while if it exceeds 0.10 mass%, the precipitates become coarse and the effect is impaired. Therefore, the amount of Al added is in the range of 0.005 to 0.10 mass%. A preferred lower limit is 0.01 mass%. A preferable upper limit is 0.05 mass%.
- N 0.004 to 0.015 mass%
- N is an element that forms Al and AlN and acts as an inhibitor. If the N content is less than 0.004 mass%, the inhibitory power as an inhibitor is not sufficient, while if it exceeds 0.15 mass%, the precipitate becomes coarse and the effect is impaired. Therefore, the amount of N added is in the range of 0.004 to 0.15 mass%. A preferred lower limit is 0.006 mass%. A preferable upper limit is 0.010 mass%.
- Se at least one of 0.005 to 0.06 mass%
- S 0.005 to 0.06 mass%
- Se is a powerful element that acts as an inhibitor by forming Mn and MnSe.
- S is a powerful element that acts as an inhibitor by forming Mn and MnS. Therefore, at least one of Se and S is added. If the Se content is less than 0.005 mass%, the inhibitory power as an inhibitor is not sufficient, while if it exceeds 0.06 mass%, the precipitates are coarsened and the effect is impaired. Therefore, the addition amount of Se is set to be in the range of 0.005 to 0.06 mass% in both cases where the Se is added alone and when it is combined with S.
- a preferred lower limit is 0.010 mass%.
- a preferable upper limit is 0.030 mass%.
- the addition amount of S is in the range of 0.005 to 0.06 mass% both when added alone and when combined with Se.
- a preferable lower limit is 0.015 mass%.
- a preferable upper limit is 0.035 mass%.
- the grain-oriented electrical steel sheet according to the present invention contains grain boundary segregation elements such as Cu, Sn, Sb, Mo, Te and Bi in addition to the above-described S, Se, Al, and N as inhibitor components. May be. When these elements are added, it is preferable to add Cu, Sn: 0.01 to 0.15 mass% and Sb, Mo, Te, Bi: 0.005 to 0.1 mass%. These inhibitor components may be added alone or in combination. Compositions other than the above are preferably iron and inevitable impurities.
- a silicon steel continuous casting slab having a component composition described in Table 1 and having the balance of Fe and inevitable impurities and having a thickness of 220 mm and a width of 1200 mm is heated in a normal gas heating furnace, and further in an induction heating furnace at 1430 ° C. Until the inhibitor component is in solution, hot rough rolling, hot finish rolling at a rolling end temperature of 1000 ° C. to form a hot rolled sheet with a thickness of 2.4 mm, and then the cooling conditions are controlled.
- the steel sheet temperature satisfies T (t) ⁇ FDT- (FDT-700) ⁇ t / 6 for the entire coil length, and the hot-rolled coil tip 3 seconds after the finish rolling is finished (within 10% of the length from the tip)
- the steel plate temperature of was controlled so as to be the temperature shown in Table 2, and wound at 550 ° C.
- Table 2 the following formula: ⁇ 100 (%) ⁇ (tip thickness ⁇ target thickness) / (target thickness) ⁇
- the deviation rate of the coil thickness with respect to the target plate thickness at each coil tip defined by the above is also shown.
- the hot-rolled sheet is then subjected to hot-rolled sheet annealing, pickling, and cold-rolled sheet having a final sheet thickness of 0.23 mm by two cold rolling sandwiching one intermediate annealing, and magnetic domain subdivision
- the cold-rolled sheet is subjected to decarburized refractory purity at 850 ° C. ⁇ 2 minutes in a wet hydrogen atmosphere, and an annealing separator mainly composed of MgO is applied, Final finishing annealing was performed at 1200 ° C. for 10 hours in a hydrogen atmosphere to obtain a product (oriented electrical steel sheet).
- specimens were taken from positions corresponding to the hot rolling coil tip (most advanced part) and the central part, and iron loss W 17/50 (frequency 50 Hz, maximum magnetic flux density 1.7 T) When iron loss) was measured.
Abstract
Description
T(t)<FDT−(FDT−700)×t/6 ・・・(1)
ここで、T(t):鋼板温度(℃)、FDT:仕上圧延終了温度(℃)、t:熱間圧延の仕上圧延終了からの経過時間(秒)
を満足するように処理し、700℃以下で巻き取る方法である。
しかしながら、この技術を駆使したとしても、熱間圧延における先端部分、特に、コイル全長の先端側5~10%長さに相当する部分における磁気特性、特に鉄損特性が、コイル中央部に比べて約10%程度劣る傾向があり、解決すべき品質課題として残されていた。
上記熱間圧延における仕上圧延終了後の冷却時におけるコイル全長の鋼板温度が、下記(1)式;
T(t)<FDT−(FDT−700)×t/6 ・・・(1)
ここで、T(t):鋼板温度(℃)、FDT:仕上圧延終了温度(℃)、t:仕上圧延終了からの経過時間(秒)
を満たし、かつ、コイル先端側10%長さ部分について、熱間圧延終了から3秒後の鋼板温度が650℃以上となるよう制御することを特徴とする磁気特性に優れる方向性電磁鋼板の製造方法である。
すなわち本発明で用いる鋼スラブの組成についてまとめると、C:0.01~0.10mass%、Si:2.5~4.5mass%、Mn:0.02~0.12mass%、Al:0.005~0.10mass%、N:0.004~0.015mass%を含有し、さらにSe:0.005~0.06mass%およびS:0.005~0.06mass%のうちから選ばれる少なくとも1種を含有し、あるいはさらにCu:0.01~0.15mass%、Sn:0.01~0.15mass%、Sb:0.005~0.1mass%、Mo:0.005~0.1mass%、Te:0.005~0.1mass%およびBi:0.005~0.1mass%うちから選ばれる少なくとも1種を含有し、好ましくは残部が鉄および不可避的不純物である。
本発明の製造方法は、後述するように、熱間圧延終了後の冷却条件を適正化したところに特徴があり、熱延後の冷却条件を後述する適正範囲に制御すること以外、特に制限はない。 したがって、その他の製造工程、例えば、製鋼、熱間圧延、熱延板焼鈍、酸洗(pickling)、中間焼鈍、冷間圧延、脱炭焼鈍、焼鈍分離剤塗布および仕上焼鈍などの各工程における製造条件については、それぞれ公知の方法にしたがって行えばよい。
先述したように、発明者らの調査の結果では、1コイルずつ圧延しているバッチ式の熱間圧延では、コイル先端部の板厚は、10%程度目標板厚から外れることが多いこと、また、コイル先端部は、コイル先端がコイラーに巻き付くまでの間、低速で圧延されるため、高速圧延されるコイル中央部と比較して過冷状態となることが多いことが確認された。
なお、図1は、後述の組成要件を満たす種々の鋼スラブから得られた方向性電磁鋼板を多数(コイル中央部の鉄損値(圧延方向)は0.72~0.84W/kg)、調査して得たものである。
また、板厚変動量は、後述の実施例で定義される、目標板厚(コイル長手方向中央の平均値の目標値)に対する先端部の板厚の外れ率(ゲージ外れ率)で評価した。
仕上圧延終了後の時間は、鋼板が仕上圧延機の最終の圧延ロールを出た時点を始点とする。
特許文献1の従来技術では、仕上圧延終了後2~6秒後の鋼板温度の上限温度を規制することにより、インヒビターが粗大化するのを抑制し、磁気特性の低下を防止している。しかしながら、逆に、仕上圧延終了後の鋼板を冷却し過ぎた場合には、インヒビターの析出が微細になり過ぎて、インヒビターとしての抑制力が強くなり過ぎる。 また、仕上圧延後の鋼板を急冷した場合には、動的再結晶が進行しないため、二次再結晶する際にゴス方位が蚕食して成長するために必要な(111)方位が減少し、有害な(200)方位が増加する。 これらの要因により、二次再結晶が安定して起こり難くなり、その結果、鉄損特性が低下してしまう。 すなわち、コイル全長の上限温度を規制しようとすると、比較的鋼板温度が低くなる熱延コイルの先端部は冷却し過ぎることになり、かえって問題が生じることが見出されたのである。
T(t)<FDT−(FDT−700)×t/6 ・・・(1)
ここで、T(t):鋼板温度(℃)、FDT:仕上圧延終了温度(℃)、t:仕上圧延終了からの経過時間(秒)
を満たすようにする。 また、熱延コイルの先端部(コイル全長の10%長さ部分)の冷却時の鋼板温度の下限温度は、熱間圧延終了後から3秒後の鋼板温度が650℃以上となるようにする。 すなわち、熱延コイル先端部の冷却時の鋼板温度が、図2に示した斜線部を通過するよう冷却条件を制御する。
なお、バッチ式の熱間圧延においてコイル先端部の板厚は、コイルによっては最大±20%程度まで外れることがあるが、そのような場合でも、650℃以上に3秒間以上保持することで磁気特性を維持することができる。
本発明の製造方法に適合する方向性電磁鋼板は、インヒビターとして、AlNとMnSe、MnSを複合添加したものであることが必要であり、その有すべき成分組成は以下のとおりである。
C:0.01~0.10mass%
Cは、熱間圧延、冷間圧延中の組織の均一微細化のみならず、ゴス方位の発達にも有用な元素であり、スラブの段階では少なくとも0.01mass%を含有させる必要がある。一方、0.10mass%を超えて添加すると、焼鈍工程で脱炭することが困難となり、却ってゴス方位に乱れが生じ、磁気特性が低下するので、上限は0.10mass%とする。 好ましいC含有量の下限は0.03mass%である。 好ましい上限は0.08mass%である。 なお、仕上焼鈍後のC量は0.004mass%以下とすることが好ましい。
Siは、鋼板の比抵抗を高め、鉄損の低減に寄与する必須の元素である。 Si含有量が2.5mass%未満では、鉄損低減効果が十分ではなく、また、二次再結晶と純化のために行われる高温での仕上焼鈍において、α−γ変態による結晶方位のランダム化が生じて、十分な磁気特性が得られなくなる。 一方、4.5mass%を超えると、冷間圧延性が損なわれ、製造することが困難となる。 よって、Si含有量は2.5~4.5mass%の範囲とする。 好ましい下限は3.0mass%である。 好ましい上限は3.5mass%である。
Mnは、Sに起因した熱間圧延時の割れを防止するのに有効な元素であるが、0.02mass%未満ではその効果は得られない。 一方、0.12mass%を超えて添加すると磁気特性が劣化する。 よって、Mn含有量は0.02~0.12mass%の範囲とする。 好ましい下限は0.05mass%である。 好ましい上限は0.10mass%である。
Alは、NとAlNを形成してインヒビターとして作用する元素である。 Al含有量が0.005mass%未満では、インヒビターとしての抑制力が十分ではなく、一方、0.10mass%を超えると、析出物が粗大化して、その効果が損なわれる。 よって、Alの添加量は0.005~0.10mass%の範囲とする。 好ましい下限は0.01mass%である。 好ましい上限は0.05mass%である。
Nは、AlとAlNを形成してインヒビターとして作用する元素である。 N含有量が0.004mass%未満では、インヒビターとしての抑制力が十分ではなく、一方、0.15mass%を超えると、析出物が粗大化して、その効果が損なわれる。 よって、Nの添加量は0.004~0.15mass%の範囲とする。 好ましい下限は0.006mass%である。 好ましい上限は0.010mass%である。
Seは、MnとMnSeを形成してインヒビターとして作用する有力な元素である。また、Sは、MnとMnSを形成してインヒビターとして作用する有力な元素である。 したがってSeおよびSの少なくともいずれかを添加する。
Se含有量が、0.005mass%未満では、インヒビターとしての抑制力が十分ではなく、一方、0.06mass%を超えると、析出物が粗大化して、その効果が損なわれる。 よって、Seの添加量は、単独添加する場合およびSと複合添加する場合のいずれとも0.005~0.06mass%の範囲とする。 好ましい下限は0.010mass%である。 好ましい上限は0.030mass%である。
上記以外の組成は鉄および不可避的不純物とすることが好ましい。
{100(%)×(先端部板厚−目標板厚)/(目標板厚)}
で定義される各コイル先端部の、板厚の目標板厚に対する外れ率を併記した。
上記熱延板は、その後、熱延板焼鈍を施した後、酸洗し、1回の中間焼鈍を挟む2回の冷間圧延で最終板厚が0.23mmの冷延板とし、磁区細分化のための溝をエッチングにより形成した後、上記冷延板を、湿水素雰囲気中で850℃×2分の脱炭焼純を施し、MgOを主成分とする焼鈍分離剤を塗布し、その後、水素雰囲気中で1200℃×10時間の最終仕上焼鈍を施し、成品(方向性電磁鋼板)とした。
かくして得られた成品について、熱間圧延のコイル先端部(最先端部分)と中央部に相当する位置から試験片を採取し、鉄損W17/50(周波数50Hz、最大磁束密度1.7Tのときの鉄損)を測定した。
Claims (2)
- C:0.01~0.10mass%、
Si:2.5~4.5mass%、
Mn:0.02~0.12mass%、
Al:0.005~0.10mass%、
N:0.004~0.015mass%を含有し、
さらにSe:0.005~0.06mass%およびS:0.005~0.06mass%のうちから選ばれる1種または2種を含有する鋼スラブを1280℃以上の温度に加熱後、熱間圧延し、あるいはさらに熱延板焼鈍し、1回の冷間圧延または中間焼鈍を挟む2回以上の冷間圧延により最終板厚とし、その後、脱炭焼鈍および仕上焼鈍を施す一連の工程を経て方向性電磁鋼板を製造する方法であって、かつ、
上記熱間圧延における仕上圧延終了後の冷却時におけるコイル全長の鋼板温度が下記(1)式を満たし、かつ、コイル先端側10%長さ部分について、熱間圧延終了から3秒後の鋼板温度が650℃以上となるよう制御する方向性電磁鋼板の製造方法。
記
T(t)<FDT−(FDT−700)×t/6 ・・・(1)
ここで、T(t):鋼板温度(℃)、FDT:仕上圧延終了温度(℃)、t:仕上圧延終了からの経過時間(秒) - 鋼スラブが、上記成分組成に加えてさらに、Cu:0.01~0.15mass%、Sn:0.01~0.15mass%、Sb:0.005~0.1mass%、Mo:0.005~0.1mass%、Te:0.005~0.1mass%およびBi:0.005~0.1mass%うちから選ばれる1種または2種以上を含有する請求項1に記載の方向性電磁鋼板の製造方法。
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- 2011-03-09 EP EP11753517.9A patent/EP2546367B1/en active Active
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- 2011-03-09 BR BR112012022875-7A patent/BR112012022875B1/pt active IP Right Grant
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EP2412831A1 (en) * | 2009-03-23 | 2012-02-01 | Nippon Steel Corporation | Process for producing grain-oriented magnetic steel sheet, grain-oriented magnetic steel sheet for wound core, and wound core |
EP2412831A4 (en) * | 2009-03-23 | 2017-05-03 | Nippon Steel & Sumitomo Metal Corporation | Process for producing grain-oriented magnetic steel sheet, grain-oriented magnetic steel sheet for wound core, and wound core |
EP3696288A3 (en) * | 2009-03-23 | 2020-09-09 | Nippon Steel Corporation | Manufacturing method of grain oriented electrical steel sheet, grain oriented electrical steel sheet for wound core, and wound core |
Also Published As
Publication number | Publication date |
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EP2546367A4 (en) | 2017-05-03 |
JP5712491B2 (ja) | 2015-05-07 |
RU2012143614A (ru) | 2014-04-20 |
RU2519691C2 (ru) | 2014-06-20 |
EP2546367B1 (en) | 2020-09-16 |
US20120298265A1 (en) | 2012-11-29 |
EP2546367A1 (en) | 2013-01-16 |
BR112012022875A2 (pt) | 2018-06-05 |
BR112012022875B1 (pt) | 2019-06-11 |
US8936687B2 (en) | 2015-01-20 |
JP2011190485A (ja) | 2011-09-29 |
KR101433492B1 (ko) | 2014-09-17 |
CN103124798B (zh) | 2016-06-29 |
KR20120120455A (ko) | 2012-11-01 |
CN103124798A (zh) | 2013-05-29 |
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