CN108754338B - Production process of high-magnetic-induction low-iron-loss oriented silicon steel - Google Patents
Production process of high-magnetic-induction low-iron-loss oriented silicon steel Download PDFInfo
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- CN108754338B CN108754338B CN201810446179.1A CN201810446179A CN108754338B CN 108754338 B CN108754338 B CN 108754338B CN 201810446179 A CN201810446179 A CN 201810446179A CN 108754338 B CN108754338 B CN 108754338B
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- steel
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 130
- 238000000034 method Methods 0.000 claims abstract description 69
- 230000008569 process Effects 0.000 claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 claims abstract description 57
- 238000007670 refining Methods 0.000 claims abstract description 52
- 238000009749 continuous casting Methods 0.000 claims abstract description 38
- 238000001953 recrystallisation Methods 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 223
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 214
- 239000001301 oxygen Substances 0.000 claims description 214
- 229910000831 Steel Inorganic materials 0.000 claims description 196
- 239000010959 steel Substances 0.000 claims description 196
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 108
- 238000007664 blowing Methods 0.000 claims description 100
- 238000000137 annealing Methods 0.000 claims description 73
- 239000002893 slag Substances 0.000 claims description 57
- 229910052786 argon Inorganic materials 0.000 claims description 54
- 238000001816 cooling Methods 0.000 claims description 54
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 45
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 45
- 239000004571 lime Substances 0.000 claims description 45
- 239000011572 manganese Substances 0.000 claims description 42
- 238000005096 rolling process Methods 0.000 claims description 40
- 238000010079 rubber tapping Methods 0.000 claims description 37
- 238000005097 cold rolling Methods 0.000 claims description 36
- 238000005261 decarburization Methods 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 28
- 235000019738 Limestone Nutrition 0.000 claims description 27
- 239000006028 limestone Substances 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 27
- 230000009467 reduction Effects 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000003723 Smelting Methods 0.000 claims description 20
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 19
- 239000011575 calcium Substances 0.000 claims description 18
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 18
- 239000010459 dolomite Substances 0.000 claims description 18
- 229910000514 dolomite Inorganic materials 0.000 claims description 18
- 239000010436 fluorite Substances 0.000 claims description 18
- 238000009489 vacuum treatment Methods 0.000 claims description 18
- 239000000956 alloy Substances 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- 229910052720 vanadium Inorganic materials 0.000 claims description 12
- 229910052787 antimony Inorganic materials 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 229910052758 niobium Inorganic materials 0.000 claims description 11
- 238000005275 alloying Methods 0.000 claims description 10
- -1 aluminum-magnesium-manganese Chemical compound 0.000 claims description 10
- 229910052718 tin Inorganic materials 0.000 claims description 10
- 229910001339 C alloy Inorganic materials 0.000 claims description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 9
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 9
- 229910052593 corundum Inorganic materials 0.000 claims description 9
- 229910052906 cristobalite Inorganic materials 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 9
- 230000008025 crystallization Effects 0.000 claims description 9
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 9
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052682 stishovite Inorganic materials 0.000 claims description 9
- 229910052715 tantalum Inorganic materials 0.000 claims description 9
- 229910052905 tridymite Inorganic materials 0.000 claims description 9
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 9
- 239000012467 final product Substances 0.000 claims description 4
- 238000005098 hot rolling Methods 0.000 abstract description 8
- 239000003112 inhibitor Substances 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 9
- 239000002244 precipitate Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005262 decarbonization Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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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
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
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- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
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- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
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- 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
- C21D8/1255—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
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- 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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- 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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
A production process of high-magnetic-induction low-iron-loss oriented silicon steel comprises the following components, by mass, 0.06-0.07% of C, 4.1-4.2% of Si, less than or equal to 0.01% of P, 0.06-0.12% of Mn, 0.02-0.03% of S, 4: 1% of Mn/S, 0.010-0.050% of Al, 0.003-0.020% of N, 0.04-0.045% of Se, 1.6-1.70% of Ni, 0.6-0.65% of Cr, 0.1-0.15% of Cu, 0.005-0.01% of Sb, 0.4-0.5% of Sn, 0.15-0.20% of Bi, 0.05-0.08% of Mo, 0.0010-0.010% of Nb, 0.1-0.15% of V, 0.05-0.08% of Ti, 0.1-0.15% of Ta, the balance of Fe and inevitable impurities, and is refined through hot rolling → 60nm in a converter → refining process, and the final size of MnS → 60nm in a hot rolling process of continuous casting and LF → refining → 60nm2The size of S particle is 25-40nm, the secondary recrystallization particle diameter is 10-11mm, and the iron loss W is17/50Is 0.78-0.82W/kg, B8Is 1.9-1.95T.
Description
Technical Field
The invention belongs to the field of steel materials, and particularly relates to a production process of high-magnetic-induction low-iron-loss oriented silicon steel.
Background
Making steel by a converter (or an electric furnace), carrying out secondary refining and alloying, and continuously casting the steel into a plate blank, wherein the basic chemical components of the plate blank comprise 2.5-4.5% of Si, 0.06-0.10% of C and 0.03-0.1% of Mn, and usually also comprise one or more of Cu, Mo, Sb, B, Bi and other elements, and the balance of iron and inevitable impurity elements; heating the plate blank in a special high-temperature heating furnace to the temperature of more than 1350 ℃, preserving heat to ensure that MnS or AlN which is beneficial to inclusion is fully dissolved, then rolling, rapidly spraying water to cool the plate blank to the temperature of less than 500 ℃ when the final rolling temperature reaches more than 950 ℃, and then coiling. So as to separate out fine and dispersed second phase particles, namely inhibitors, in the silicon steel matrix in the subsequent normalizing process; after normalizing the hot rolled plate, carrying out acid cleaning to remove surface iron oxide scales; cold rolling to the thickness of the finished product, decarburizing annealing and coating an annealing separant taking MgO as a main component to remove the [ C ] in the steel plate to the extent of not influencing the magnetism of the finished product (generally below 30 ppm); in the high-temperature annealing process, the steel plate undergoes physical and chemical changes such as secondary recrystallization, formation of a magnesium silicate bottom layer, purification (removal of elements harmful to magnetism such as S, N in the steel) and the like, so that high-magnetic-induction oriented silicon steel with high orientation degree and low iron loss is obtained; finally, the oriented silicon steel product in a commercial application form is obtained through coating an insulating coating and stretching annealing.
At present, the industrial production of the general oriented silicon steel is realized by controlling the inhibitor in the steel. The inhibitor mainly refers to specific second phase particles in the silicon steel, and inhibits the growth of other grains by controlling the type, distribution, quantity and size of the inhibitor in the silicon steel so as to realize secondary recrystallization of Goss grains. The common inhibitor is mainly a compound such as MnS, MnSe, AlN and the like, and a grain boundary segregation element such as Sn, Bi, Pb and the like can also be used as an auxiliary inhibitor. Generally, in order to obtain inhibitors such as MnS, MnSe, AlN and the like, a casting blank needs to be subjected to high-temperature and long-time heating treatment and then is subjected to hot rolling, the heating temperature reaches 1350-.
With the continuous increase of the demands for resource conservation and high performance, the requirements for the oriented silicon steel are also continuously changed.
Disclosure of Invention
The invention aims to provide a production method of high magnetic induction oriented silicon steel, which can obtain specific inhibitor type, size and distribution state by controlling product components and production process, ensure stable and higher inhibition capability and strictly control the average grain size of secondary recrystallization, thereby obtaining the oriented silicon steel with high magnetic induction, low iron loss and stable performance.
The technical scheme is as follows:
a production process of high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.06-0.07% of C, 4.1-4.2% of Si, less than or equal to 0.01% of P, 0.06-0.12% of Mn, 0.02-0.03% of S, 4: 1% of Mn/S, 0.010-0.050% of Al, 0.003-0.020% of N, 0.04-0.045% of Se, 1.6-1.70% of Ni, 0.6-0.65% of Cr, 0.1-0.15% of Cu0.005-0.01% of Sb, 0.4-0.5% of Sn, 0.15-0.20% of Bi, 0.05-0.08% of Mo, 0.0010-0.010% of Nb, 0.1-0.15% of V, 0.05-0.08% of Ti, 0.1-0.15% of Ta and the balance Fe and inevitable impurities, wherein the size of MnS particles in a final product is 20-50nm, the size of Se particles is 45-60nm, and the size of MnS particles is 45-2The size of S particle is 25-40nm, the secondary recrystallization particle diameter is 10-11mm, and the iron loss W is17/50Is 0.78-0.82W/kg, B8Is 1.9-1.95T;
the production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3V (t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime addition amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, and the mixture is mixed with theAdding 7kg/t steel, rotating the converter, discharging slag, adding limestone into the converter to prepare for decarbonization, wherein the oxygen supply speed in the decarbonization stage is 4.0-4.1m3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with arbitrary mixing proportion of wet N2+ H2 for decarburization annealing at 860 ℃ and 870 ℃ for 60-70 seconds; and coating a separant with MgO accounting for 80% on the surface of the steel plate after decarburization annealing, performing secondary recrystallization, and performing final annealing at 1180 ℃ for 8 hours in an H2 environment to prepare the oriented silicon steel.
Further: the production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.06% of C, 4.1% of Si, not more than 0.01% of P, 0.08% of Mn, 0.02% of S, a mass ratio of Mn/S of 4: 1, 0.010% of Al, 0.003% of N, 0.04% of Se, 1.6% of Ni, 0.6% of Cr, 0.1% of Cu, 0.005% of Sb, 0.4% of Sn, 0.15% of Bi, 0.05% of Mo, 0.001% of Nb, 0.1% of V, 0.05% of Ti and 0.1% of Ta, and the balance of Fe and inevitable impurities.
Further: the production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.065% of C, 4.15% of Si, 0.01% or less of P, 0.08% of Mn, 0.02% of S, 4: 1% of Mn/S, 0.03% of Al, 0.01% of N, 0.043% of Se, 1.65% of Ni, 0.62% of Cr, 0.12% of Cu, 0.008% of Sb, 0.45% of Sn, 0.18% of Bi, 0.07% of Mo, 0.005% of Nb0.12, 0.12% of V, 0.06% of Ti and 0.12% of Ta, and the balance of Fe and inevitable impurities.
Further: the production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.07 of C, 4.2 of Si, less than or equal to 0.01 of P, 0.12 of Mn, 0.03 of S, 4: 1 of Mn/S, 0.050 of Al, 0.020 of N, 0.045 of Se, 1.70 of Ni, 0.65 of Cr, 0.15 of Cu, 0.01 of Sb, 0.5 of Sn, 0.20 of Bi0.20 of Bi0.08 of Mo, 0.010 of Nb, 0.15 of V, 0.08 of Ti and 0.15 of Ta, and the balance of Fe and inevitable impurities.
Further: the production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: step (6), carrying out hot-rolled plate annealing on the obtained hot-rolled plate with the thickness of 2.3mm, specifically, keeping the temperature at 1120 ℃ for 30 seconds; (7) the first cold rolling was performed at a reduction of 82%, and then the first annealing was performed at a temperature of 1120 ℃ for 30 seconds, and then the second cold rolling was performed at a reduction of 65%, to obtain a final cold-rolled sheet.
Compared with the prior art, the invention has the technical effects that:
1. the invention obtains the high magnetic induction low iron loss oriented silicon steel by accurately controlling the product components and the specific production process, the size of MnS particles in the final product is 20-50nm, the size of MnSe particles is 45-60nm, the size of Cu2S particles is 25-40nm, the secondary recrystallization grain diameter is 10-11mm, the iron loss W17/50 is 0.78-0.82W/kg, and B8 is 1.9-1.95T.
2. According to the invention, by accurately controlling the alloy elements, the improvement of replacing the alloy with increased amount is avoided, the process cost is saved, and the production efficiency is improved.
3. The invention reduces the oxidability or oxygen content of slag by converter smelting process, protective pouring, and adopting the technical means of slag blocking plug, slag blocking rod double-slag-blocking tapping and the like, thereby reducing the generation of inclusions; the conditions for forming the inclusions are reduced by controlling the blowing flow, the wire feeding amount and the selection of the time through an LF refining process and an RH refining process, and the inclusions are actively floated and removed.
Next, the reason for limiting the chemical components of the present invention will be described. Here,% with respect to a component means weight percentage%.
C is a very important element in the steel field and directly determines the classification form of steel. Specifically, C in the oriented silicon steel is an interstitial solid solution element, so that the number of gamma-phases is increased when a plate blank is hot-rolled and heated, fine and dispersed carbides are precipitated when a hot-rolled plate is normalized, primary crystal grains are fine and uniform, and the stable development of secondary recrystallization is ensured; c, the hot and cold workability can be improved, and the edge crack of the hot rolled plate is prevented; c is a component useful for the generation of gaussian-oriented grains, and when C content is less than 0.06%, secondary recrystallization is unstable and hot rolling and cold rolling workability are poor, and cold rolling breakage is likely to occur, which affects sufficient solid solution of MnS and other elements, and stability of secondary recrystallization; however, if C is added in an amount exceeding 0.07%, the subsequent decarburization is not facilitated. Therefore, based on the control of strength, grain size, decarburization process, magnetic induction and low iron loss, C is determined to be in the range of 0.06 to 0.07%. Preferably 0.065%.
Si is an element required for increasing the resistivity of steel and reducing the iron loss, and at least 4.1% or more is added for stabilization of ferrite, realization of high-temperature heat treatment, and suppression of eddy current loss. However, if the amount exceeds 5%, the steel is hardened, which may cause internal cracking and edge cracking during hot rolling, and also makes cold rolling more difficult, and it is also not favorable to control the basicity of the molten pool and to remove inclusions, and Si is in the range of 4.1 to 4.2% in view of the temperature of product properties and cost saving. Preferably 4.15%.
Mn is a component effective for improving hot workability of steel, and is a useful component that forms precipitates such as MnS and MnSe in combination with S, Se and functions as an inhibitor. The Mn content is too low, the MnS inhibitor is too small, and the secondary recrystallization is unstable. However, if the Mn content is too high, the MnS solution temperature is raised, and precipitates such as MnSe coarsen, and lose the function as an inhibitor, and the object of reducing the slab heating cannot be achieved. In addition, a certain content of Mn can improve hot rolling workability and prevent hot shortness from occurring. However, if the Mn content is less than 0.06%, the above-mentioned effects cannot be obtained, while if it exceeds 0.12%, precipitates such as MnSe coarsen and lose the function as an inhibitor. Therefore, Mn is 0.06-0.12%. Preferably 0.08%.
Al forms AlN in steel and serves as a useful component for dispersing the second phase and thus functioning as an inhibitor. However, if the amount of al added as sol is less than 0.01%, the amount of AlN precipitated cannot be sufficiently secured, and therefore the above-described effects cannot be obtained, while if the amount of al added exceeds 0.05%, AlN coarsens and loses the effect as an inhibitor. Therefore, Al is 0.010 to 0.05%, preferably 0.03%.
N is a component necessary for forming AlN, like Al. However, if the amount of N added is less than 0.003%, sufficient AlN cannot be formed, and thus the above-described effects cannot be obtained, while if it exceeds 0.020%, surface defects such as expansion may occur during heating of the billet. Therefore, N is 0.003 to 0.020%. Preferably 0.01%.
P is an impurity element in the conventional steel product, and can improve the specific resistance of the oriented silicon steel and reduce the iron loss to a certain extent in the oriented silicon steel. However, too high P affects the homogeneity of MnS in the hot-rolled sheet, thereby affecting the secondary recrystallization stability. Therefore, P is less than or equal to 0.01 percent.
S is a substitutional solid solution element, MnS formed by the reaction of S and Mn is an important inhibitor of the grain-oriented silicon steel, and MnS precipitates mainly affect primary recrystallization and have an inhibitory effect on the regional variation of the grain growth caused by the primary recrystallization due to hot rolling. The appropriate [ Mn% × S% ] is the basis for ensuring the secondary recrystallization, and if the S content is too high, MnS in the cast slab becomes too coarse, the heating temperature increases, the crystal grains coarsen, and the hot rolling workability and magnetism decrease. While too high a sulfur also makes desulfurization difficult. However, if the S content is too low, the amount of MnS precipitated is insufficient, and secondary recrystallization becomes unstable. If the S content is less than 0.02%, the effect cannot be sufficiently obtained. On the other hand, if the Mn content exceeds 0.03%, the magnetic properties are liable to be degraded. In addition, the invention particularly researches the mass ratio of Mn/s to find that the size of MnS particles in the final product is 20-50nm when the mass ratio of Mn/s is 4: 1, thereby greatly improving the inhibition effect. Therefore, S is 0.02-0.03%. Preferably 0.02%.
Se is a useful component that forms a compound of MnSe or CuSe by binding with Mn or Cu, and precipitates as a dispersed second phase in steel to function as an inhibitor. However, if the total content of Se is less than 0.04%, the effect of addition is insufficient, while if it exceeds 0.045%, the solid solution during heating of the slab is not complete, and this may cause surface defects. Therefore, Se0.04 to 0.045%. Preferably 0.043%.
Ni is a conventional element for improving strength, and also has an effect of improving magnetic properties and suppressing in the oriented silicon steel. Therefore, Ni1.6 to 1.70 percent, and Ni 1.65 percent is preferred.
Cr: proper amount of Cr is added, Cr oxide can be formed on the surface of the decarburization plate, and the formation and quality improvement of a subsequent glass film are promoted; however, if the content exceeds 0.65%, the decarburization is affected, the total oxygen amount during the decarburization is not easily controlled, and the stability of nitriding is affected. Therefore, Cr0.6 to 0.65%. Preferably 0.62%.
Cu: and a proper amount of Cu can form a certain amount of CuS inhibitor, which is beneficial to the stability of secondary recrystallization. However, when the Cu content is too high, CuS precipitates become coarse, the suppression ability decreases, the effect of other inhibitors is affected, and secondary recrystallization failure is finally caused. Therefore, Cu is 0.1 to 0.15%. Preferably 0.12%.
Mo and Sb: the stability of the secondary recrystallization can be improved, but when the content exceeds a certain value, the stability of the secondary recrystallization is not increased any more. Therefore, 0.005-0.01% of Sb and 0.05-0.08% of Mo. Preferably 0.008% of Sb and 0.07% of Mo.
Sn: the method has the advantages that the grain boundary segregation is realized after the coiling and normalizing, the inhibiting force is enhanced, the effective solid solution carbon and nitrogen amount is increased during the cold rolling and aging rolling, primary crystal grains are finer and more uniform after decarburization, the number of secondary crystal nuclei is increased, the secondary recrystallization temperature is reduced, and the size of the secondary crystal grains is reduced. The content of Sn is too high, and excessive Sn oxide is formed on the surface during decarburization, so that the subsequent nitriding efficiency is influenced. Therefore, 0.4 to 0.5% of Sn, preferably 0.45% of Sn.
Bi. Ta is a common alloy element in the field of oriented silicon steel and can improve the magnetic property, so that 0.15-0.20% of Bi and 0.1-0.15% of Ta, preferably 0.18% of Bi and 0.12% of Ta are used.
Nb, V and Ti are common alloy elements in the field of oriented silicon steel, and can also form precipitates containing N or C to improve the strength. These precipitates have the effect of making the grain growth during the final annealing uniform regardless of the coil position, thereby suppressing the variation in the magnetic properties of the oriented silicon steel. Therefore, Nb is 0.0010 to 0.010%, V is 0.1 to 0.15%, Ti is 0.05 to 0.08%, and Nb is 0.005%, V is 0.12%, and Ti is 0.06% is preferable.
Detailed Description
The technical solution of the present invention will be described in detail with reference to exemplary embodiments. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Example 1
The production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.06% of C, 4.1% of Si, not more than 0.01% of P, 0.08% of Mn, 0.02% of S, a mass ratio of Mn/S of 4: 1, 0.010% of Al, 0.003% of N, 0.04% of Se0.04%, 1.6% of Ni, 0.6% of Cr, 0.1% of Cu, 0.005% of Sb, 0.4% of Sn, 0.15% of Bi, 0.05% of Mo, 0.001% of Nb, 0.1% of V, 0.05% of Ti0.05 and 0.1% of Ta, and the balance of Fe and inevitable impurities.
The production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, then adding the molten iron,removing P, the oxygen supply speed is 3.1-3.2m in the P removing stage3V (t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime adding amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, the adding amount of the mixture is 7kg/t steel, slag is discharged after the converter is rotated, then the limestone is added into the converter to prepare for C removing, and the oxygen supply speed of the C removing stage3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with arbitrary mixing proportion of wet N2+ H2 for decarburization annealing at 860 ℃ and 870 ℃ for 60-70 seconds; and coating a separant with MgO accounting for 80% on the surface of the steel plate after decarburization annealing, performing secondary recrystallization, and performing final annealing at 1180 ℃ for 8 hours in an H2 environment to prepare the oriented silicon steel.
Example 2
The production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.065% of C, 4.15% of Si, 0.01% or less of P, 0.08% of Mn, 0.02% of S, 4: 1% of Mn/S, 0.03% of Al, 0.01% of N, 0.043% of Se0.043% of Ni, 1.65% of Cr, 0.62% of Cu, 0.12% of Sb, 0.008% of Sn, 0.45% of Bi, 0.18% of Mo, 0.005% of Nb, 0.12% of V, 0.06% of Ti and 0.12% of Ta, and the balance of Fe and inevitable impurities.
The production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3V (t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime adding amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, the adding amount of the mixture is 7kg/t steel, slag is discharged after the converter is rotated, then the limestone is added into the converter to prepare for C removing, and the oxygen supply speed of the C removing stage3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with arbitrary mixing proportion of wet N2+ H2 for decarburization annealing at 860 ℃ and 870 ℃ for 60-70 seconds; and coating a separant with MgO accounting for 80% on the surface of the steel plate after decarburization annealing, performing secondary recrystallization, and performing final annealing at 1180 ℃ for 8 hours in an H2 environment to prepare the oriented silicon steel.
Example 3
The production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.07 of C, 4.2 of Si, less than or equal to 0.01 of P, 0.12 of Mn, 0.03 of S, 4: 1 of Mn/S, 0.050 of Al, 0.020 of N, 0.045 of Se0, 1.70 of Ni, 0.65 of Cr, 0.15 of Cu, 0.01 of Sb, 0.5 of Sn, 0.20 of Bi0.20 of Bi0.08 of Mo, 0.010 of Nb, 0.15 of V, 0.08 of Ti0.08 of Ti and 0.15 of Ta, and the balance of Fe and inevitable impurities.
The production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3V (t x min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high lance position → a low oxygen lance position, the oxygen supply amount of the high lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, and lime is addedAdding 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, adding a mixture of limestone and light-burned dolomite after the P removing, wherein the mass ratio of the limestone to the light-burned dolomite is 2.5: 1, the adding amount of the mixture is 7kg/t steel, discharging slag after rotating the converter, adding limestone into the converter to prepare for C removing, and the oxygen supply speed of the C removing stage is 4.0-4.1m3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with arbitrary mixing proportion of wet N2+ H2 for decarburization annealing at 860 ℃ and 870 ℃ for 60-70 seconds; and coating a separant with MgO accounting for 80% on the surface of the steel plate after decarburization annealing, performing secondary recrystallization, and performing final annealing at 1180 ℃ for 8 hours in an H2 environment to prepare the oriented silicon steel.
Comparative example 1
The production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the steel composition of the pipeline is oriented silicon steel composition which comprises, by mass, 0.04% of C, 0.2% of Si, 0.01% of P, 0.08% of Mn, 0.02% of S, 4: 1 of Mn/S, 0.010% of Al, 0.003% of N, 0.01% of Se, 1.1% of Ni, 0.6% of Cr, 0.1% of Cu, 0.005% of Sb, 0.4% of Sn, 0.15% of Bi, 0.05% of Mo, 0.001% of Nb, 0.1% of V, 0.05% of Ti and 0.1% of Ta, and the balance of Fe and inevitable impurities.
The production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3V (t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime adding amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, the adding amount of the mixture is 7kg/t steel, slag is discharged after the converter is rotated, then the limestone is added into the converter to prepare for C removing, and the oxygen supply speed of the C removing stage3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with arbitrary mixing proportion of wet N2+ H2 for decarburization annealing at 860 ℃ and 870 ℃ for 60-70 seconds; and coating a separant with MgO accounting for 80% on the surface of the steel plate after decarburization annealing, performing secondary recrystallization, and performing final annealing at 1180 ℃ for 8 hours in an H2 environment to prepare the oriented silicon steel.
Comparative example 2
The production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.065% of C, 4.15% of Si, 0.01% or less of P, 0.08% of Mn, 0.02% of S, a mass ratio of Mn/S of 4: 1, 0.03% of Al, 0.01% of N, 0.043% of Se0.043% of Ni, 1.65% of Cr, 0.4% of Cu, 0.01% of Sb, 0.1% of Sn, 0.01% of Bi, 0.01% of Mo, 0.005% of Nb, 0.05% of V, 0.01% of Ti, 0.02% of Ta and the balance of Fe and inevitable impurities.
The production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3(t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime addition amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, the mixture addition amount is 7kg/t steel, the slag is discharged after the converter is rotated, and then the slagAdding limestone into the converter to prepare for the de-C, wherein the oxygen supply speed in the de-C stage is 4.0-4.1m3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with arbitrary mixing proportion of wet N2+ H2 for decarburization annealing at 860 ℃ and 870 ℃ for 60-70 seconds; and coating a separant with MgO accounting for 80% on the surface of the steel plate after decarburization annealing, performing secondary recrystallization, and performing final annealing at 1180 ℃ for 8 hours in an H2 environment to prepare the oriented silicon steel.
Comparative example 3
The production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.07 of C, 4.2 of Si, less than or equal to 0.01 of P, 0.06 of Mn, 0.03 of S, 0.050 of Al, 0.020 of N, 0.045 of Se, 1.70 of Ni, 0.65 of Cr0.65, 0.15 of Cu, 0.01 of Sb, 0.5 of Sn, 0.20 of Bi0.08, 0.010 of Nb, 0.15 of V, 0.08 of Ti and 0.15 of Ta, and the balance of Fe and inevitable impurities.
The production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3V (t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime adding amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, the adding amount of the mixture is 7kg/t steel, slag is discharged after the converter is rotated, then the limestone is added into the converter to prepare for C removing, and the oxygen supply speed of the C removing stage3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min, and adjusting power againThe temperature of the whole molten pool is convenient for tapping, the soft blowing stops blowing argon, and the LF refining is finished;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with arbitrary mixing proportion of wet N2+ H2 for decarburization annealing at 860 ℃ and 870 ℃ for 60-70 seconds; and coating a separant with MgO accounting for 80% on the surface of the steel plate after decarburization annealing, performing secondary recrystallization, and performing final annealing at 1180 ℃ for 8 hours in an H2 environment to prepare the oriented silicon steel.
Comparative example 4
The production process of the high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.07 of C, 4.2 of Si, less than or equal to 0.01 of P, 0.12 of Mn, 0.03 of S, 4: 1 of Mn/S, 0.050 of Al, 0.020 of N, 0.045 of Se0, 1.70 of Ni, 0.65 of Cr, 0.15 of Cu, 0.01 of Sb, 0.5 of Sn, 0.20 of Bi0.20 of Bi0.08 of Mo, 0.010 of Nb, 0.15 of V, 0.08 of Ti0.08 of Ti and 0.15 of Ta, and the balance of Fe and inevitable impurities.
The production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3V (t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime adding amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, the adding amount of the mixture is 7kg/t steel, slag is discharged after the converter is rotated, then the limestone is added into the converter to prepare for C removing, and the oxygen supply speed of the C removing stage3V (t min), accounting for 65% of total oxygen supply amount, controlling the lance position to be high lance position → low oxygen lance position, oxygen supply amount of the high lance position being 25% of the total oxygen supply amount, oxygen supply amount of the low oxygen lance position being 40% of the total oxygen supply amount, lime addition amount being 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring the temperature, sampling and finely adjusting the components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is kept at 1080 ℃ for 30 seconds;
(7) carrying out primary cold rolling at the reduction of 75% for the first time, then carrying out primary annealing on a cold-rolled sheet kept at 1080 ℃ for 30 seconds, and then carrying out secondary cold rolling at the reduction of 70% to obtain a final cold-rolled sheet;
(8) the subsequent treatment is carried out in a wet atmosphere with any mixing ratio of wet N2+ H2 for decarburization annealing at 830 ℃ for 60 seconds; the surface of the steel sheet after decarburization annealing is coated with a release agent containing 80% MgO for secondary recrystallization, and further subjected to finish annealing at 1150 ℃ for 8 hours in an H2 atmosphere to produce oriented silicon steel.
It is important to emphasize that although the comparative examples have not been subjected to more comparative tests with respect to other specific steps, it is clear to the skilled person that processes such as converter smelting, LF refining process, RH refining, continuous casting and rolling, etc. also have a great influence on the product properties.
The steel sheets of examples 1 to 3 of the present invention and comparative examples 1 to 4 were subjected to performance tests, and the test results are shown in table 1.
TABLE 1
| Type (B) | Iron loss W17/50(W/kg) | B8(T) |
| Example 1 | ≥0.78 | ≥1.92 |
| Example 2 | ≥0.8 | ≥1.93 |
| Example 3 | ≥0.82 | ≥1.95 |
| Comparative example 1 | ≥0.88 | ≥1.72 |
| Comparative example 2 | ≥0.92 | ≥1.68 |
| Comparative example 3 | ≥0.85 | ≥1.8 |
| Comparative example 4 | ≥0.95 | ≥1.61 |
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (5)
1. A production process of high-magnetic-induction low-iron-loss oriented silicon steel is characterized by comprising the following steps of: the oriented silicon steel comprises, by mass, 0.06-0.07% of C, 4.1-4.2% of Si, less than or equal to 0.01% of P, 0.06-0.12% of Mn, 0.02-0.03% of S, 4: 1% of Mn/S, 0.010-0.050% of Al, 0.003-0.020% of N, 0.04-0.045% of Se, 1.6-1.70% of Ni, 0.6-0.65% of Cr, 0.1-0.15% of Cu0.005-0.01% of Sb, 0.4-0.5% of Sn, 0.15-0.20% of Bi, 0.05-0.08% of Mo, 0.0010-0.010% of Nb, 0.1-0.15% of V, 0.05-0.08% of Ti, 0.1-0.15% of Ta and the balance Fe and inevitable impurities, wherein the size of MnS particles in a final product is 20-50nm, the size of Se particles is 45-60nm, and the size of MnS particles is 45-2The size of S particle is 25-40nm, the secondary recrystallization particle size is 10-11 microns, and the iron loss W is17/50Is 0.78-0.82W/kg, B8Is 1.9-1.95T;
the production process route of the oriented silicon steel is as follows: molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting and continuous rolling → hot rolled plate annealing → cold rolling → subsequent treatment; the method comprises the following specific steps:
(1) pretreating molten iron;
(2) smelting in a converter: selecting the molten iron and the scrap steel blocks prepared in the step (1), wherein the mass ratio of the molten iron to the scrap steel is 8: 1, adding the scrap steel firstly, adding the molten iron secondly, removing P firstly, and the oxygen supply speed in the P removing stage is 3.1-3.2m3V (t & min), the P removing stage accounts for 35% of the total oxygen supply amount, the lance position is controlled to be a high oxygen lance position → a low oxygen lance position, the oxygen supply amount of the high oxygen lance position is 15% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 20% of the total oxygen supply amount, the lime adding amount is 6-7kg/t steel, the alkalinity of the P removing stage is 1.5-1.6, after the P removing is finished, a limestone and light-burned dolomite mixture is added, the mass ratio of the limestone to the light-burned dolomite in the mixture is 2.5: 1, the adding amount of the mixture is 7kg/t steel, slag is discharged after the converter is rotated, then the limestone is added into the converter to prepare for C removing, and the oxygen supply speed of the C removing stage3(t x min), accounting for 65% of the total oxygen supply amount, controlling the lance position to be a high oxygen lance position → a low oxygen lance position, wherein the oxygen supply amount of the high oxygen lance position is 25% of the total oxygen supply amount, the oxygen supply amount of the low oxygen lance position is 40% of the total oxygen supply amount, the lime addition amount is 12-13kg/t steel, and the converter end point alkalinity is 3.8-3.9; the tapping temperature is 1600-one 1620 ℃; carrying out double slag-blocking tapping by adopting a slag-blocking plug and a slag-blocking rod; 5-5.5kg/t of lime and 1.5-2kg/t of fluorite are added in the tapping process to make top slag; wherein the high oxygen lance position is H0× (1.4-1.5), and the low oxygen gun position is H0×(0.07～0.09)，H0Is the height of the liquid level of the steel in the converter;
(3) an LF refining process: firstly adding 0.2kg/t of aluminum wire, 0.6kg/t of fluorite and 1kg/t of lime, firstly controlling the flow of bottom blowing argon at 450-460L/min until the lime is molten and then adjusting to 210L/min, stopping electrifying after the slag is completely white, and making the target components of the white slag: CaO 55%, SiO225％，Al2O314.5％，MgO 5％，FeO+Fe2O3The MnO is less than or equal to 1.0 percent; stirring vigorously to remove P and O, controlling the flow rate of bottom blowing argon at 700-720L/min, stirring for 12min in the state, then controlling the flow rate of bottom blowing argon at 120-130L/min, stirring for 10-15min in the state, electrifying again to adjust the temperature of the molten pool so as to facilitate steel tapping, stopping argon blowing by soft blowing, and finishing LF refining;
(4) RH refining: vacuumizing for natural decarburization under the condition of not blowing oxygen, increasing the Ar flow rate to 800 plus 850NL/min, carrying out molten steel dehydrogenation, ensuring that the deep vacuum treatment time is more than or equal to 12min, adding 0.01-0.03kg/t of an aluminum-magnesium-manganese composite deoxidizer for removing redundant oxygen in the molten steel, then alloying the molten steel by using low-carbon ferromanganese, ferrosilicon and an alloy material containing Se, Ni, Cr, Cu, Sb, Sn, Bi, Mo, Nb, V, Ti and Ta, and after the component adjustment is finished, requiring the vacuum treatment time to be 6-7min, and measuring temperature, sampling and finely adjusting components in the period; after the vacuum is finished, hydrogen determination is carried out; feeding SiCa wires into molten steel in each furnace, and ensuring that the content of Ca in the molten steel is between 25 and 30ppm, and adjusting according to the content of calcium in the steel; soft blowing is carried out on the molten steel before the ladle is hung, the flow of soft argon blowing is controlled to be 50-60L/min, the slag surface is not blown open, and the soft blowing time of the molten steel is ensured to be 12-13 min; standing for 5-6min after soft blowing;
(5) continuous casting and rolling: the production is carried out by a CSP thin slab continuous casting and rolling process; controlling the superheat degree of molten steel to be between 15 and 20 ℃ plus the liquidus temperature, hydraulically vibrating a non-sinusoidal crystallizer vibration curve and a secondary cooling curve in the crystallization process, wherein the vibration frequency of the non-sinusoidal crystallizer vibration curve is 200-; controlling the finish rolling temperature to be 880-920 ℃, and controlling the thickness of the hot rolled plate to be 2-2.5 mm; after laminar cooling, coiling at the temperature of 600-700 ℃, after coiling, slowly cooling to 280-320 ℃ at a cooling speed of less than or equal to 10 ℃/S after coil-off, then rapidly cooling at a cooling speed of more than or equal to 30 ℃/S, blowing argon for protection in the whole process, avoiding molten steel oxidation, and controlling nitrogen increase in the continuous casting process; the tundish covering agent is adopted to prevent the molten steel from being exposed and low-carbon alloy covering slag is selected;
(6) hot-rolled plate annealing the obtained hot-rolled plate with the thickness of 2-2.5mm is subjected to hot-rolled plate annealing, and the hot-rolled plate is specifically kept at 1100-1120 ℃ for 30 seconds;
(7) performing primary cold rolling with the reduction of 80-85% for the first time, performing primary annealing on a cold-rolled sheet at 1100-1120 ℃ for 30 seconds, and performing secondary cold rolling with the reduction of 60-70% to obtain a final cold-rolled sheet;
(8) subsequent treatment in wet N2+H2Decarburizing annealing is carried out in a humid atmosphere with any mixing proportion, the decarburizing annealing temperature is 860-870 ℃, and the annealing time is 60-70 seconds; coating the surface of the decarburized and annealed steel sheet with a release agent comprising 80% MgO, performing secondary recrystallization, and further performing H2And (3) carrying out final annealing at 1180 ℃ for 8 hours under the environment to prepare the oriented silicon steel.
2. The process for producing the high-magnetic-induction low-iron-loss oriented silicon steel as claimed in claim 1, wherein: the oriented silicon steel comprises, by mass, 0.06% of C, 4.1% of Si, not more than 0.01% of P, 0.08% of Mn, 0.02% of S, a mass ratio of Mn/S of 4: 1, 0.010% of Al, 0.003% of N, 0.04% of Se, 1.6% of Ni, 0.6% of Cr, 0.1% of Cu, 0.005% of Sb, 0.4% of Sn, 0.15% of Bi, 0.05% of Mo, 0.001% of Nb0.001, 0.1% of V, 0.05% of Ti and 0.1% of Ta, and the balance of Fe and inevitable impurities.
3. The process for producing the high-magnetic-induction low-iron-loss oriented silicon steel as claimed in claim 1, wherein: the oriented silicon steel comprises, by mass, 0.065% of C, 4.15% of Si, less than or equal to 0.01% of P, 0.08% of Mn, 0.02% of S, 4: 1 of Mn/S, 0.03% of Al, 0.01% of N, 0.043% of Se, 1.65% of Ni, 0.62% of Cr, 0.12% of Cu, 0.008% of Sb, 0.45% of Sn, 0.18% of Bi, 0.07% of Mo0.07% of Nb, 0.005% of V, 0.06% of Ti and 0.12% of Ta, and the balance of Fe and inevitable impurities.
4. The process for producing the high-magnetic-induction low-iron-loss oriented silicon steel as claimed in claim 1, wherein: the oriented silicon steel comprises, by mass, 0.07 of C, 4.2 of Si, less than or equal to 0.01 of P, 0.12 of Mn, 0.03 of S, 4: 1 of Mn/S, 0.050 of Al, 0.020 of N, 0.045 of Se, 1.70 of Ni, 0.65 of Cr, 0.15 of Cu, 0.01 of Sb, 0.5 of Sn, 0.20 of Bi0.20 of Bi, 0.08 of Mo0.08 of Nb, 0.010 of V, 0.15 of Ti, 0.15 of Ta, and the balance of Fe and inevitable impurities.
5. The process for producing the high-magnetic-induction low-iron-loss oriented silicon steel as claimed in claim 1, wherein: step (6), carrying out hot-rolled plate annealing on the obtained hot-rolled plate with the thickness of 2.3mm, specifically, keeping the temperature at 1120 ℃ for 30 seconds; (7) the first cold rolling was performed at a reduction of 82%, and then the first annealing was performed at a temperature of 1120 ℃ for 30 seconds, and then the second cold rolling was performed at a reduction of 65%, to obtain a final cold-rolled sheet.
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