CN104962816A - Ultrathin oriented silicon steel sheet and short-process manufacturing method thereof - Google Patents
Ultrathin oriented silicon steel sheet and short-process manufacturing method thereof Download PDFInfo
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- CN104962816A CN104962816A CN201510418332.6A CN201510418332A CN104962816A CN 104962816 A CN104962816 A CN 104962816A CN 201510418332 A CN201510418332 A CN 201510418332A CN 104962816 A CN104962816 A CN 104962816A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000000137 annealing Methods 0.000 claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000005097 cold rolling Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 11
- 238000005554 pickling Methods 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 21
- 229910052739 hydrogen Inorganic materials 0.000 claims description 21
- 239000001257 hydrogen Substances 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 9
- 230000008025 crystallization Effects 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000005266 casting Methods 0.000 abstract 1
- 238000000746 purification Methods 0.000 abstract 1
- 238000001953 recrystallisation Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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Abstract
The invention relates to an ultrathin oriented silicon steel sheet and a short-process manufacturing method thereof. The steel sheet comprises the following components in percentage by mass: 0.002-0.08% of C, 2.8-3.4% of Si, 0.05-0.30% of Mn, 0.015-0.04% of S, 0.005-0.05% of Als, 0.003-0.010% of N, 0-0.6% of Cu, 0-0.2% of Sn, less than 0.004% of O, less than 0.01% of P and the balance of Fe. The thickness of the product is 0.05-0.15mm. The manufacturing method comprises the following steps: (1) smelting molten steel; (2) carrying out continuous casting to obtain a casting band; (3) cooling, carrying out hot rolling and coiling; (4) carrying out normalizing treatment and controlled cooling; (5) pickling, and carrying out primary cold rolling; carrying out interannealing; (6) pickling, and carrying out secondary cold rolling; carrying out decarburizing annealing; (7) coating an annealing separant; and (8) carrying out high-temperature annealing and purification annealing. The method greatly simplifies the ultrathin oriented silicon steel sheet production process, is simple and effective, and has the characteristics of short process, high controllability and low energy consumption.
Description
Technical field
The invention belongs to electrical steel and manufacture field, be specifically related to a kind of very thin directional silicon steel and short route manufacture method thereof.
Background technology
Oriented silicon steel (comprising common orientation silicon steel and high magnetic induction grain-oriented silicon steel) is a kind of siliceous soft magnetic materials of about 3%, owing to having strong { 110}<001> goss texture, thus there is low-down iron loss and very high magnetic induction density, mainly for the manufacture of transformer core along rolling direction; It is unique product using phenomenon of secondary recrystallization to produce in Iron And Steel Industry, is that texture controlling technology is comparatively successfully applied in suitability for industrialized production; Saving by reducing the iron loss of oriented silicon steel the target that a large amount of electric energy is people's unremitting pursue, reducing oriented silicon steel thickness and becoming the main method realizing the low iron loss of oriented silicon steel.
But adopting conventional secondary recrystallization method to produce oriented silicon steel has a finished product thickness limit, is generally about about 0.15mm, when lower than this thickness, the secondary recrystallization imperfection of finished product, or cannot secondary recrystallization be there is, cause magnetic property very poor, required military service performance cannot be reached; In order to obtain the orientation silicon steel thin belt of thickness≤0.15mm, present people all adopt the production technique of tertiary recrystallization to be: first, traditional processing technology is utilized to obtain the thick secondary recrystallization oriented silicon steel of 0.20 ~ 0.35mm, after removing the glassy membrane on production board surface and insulating film, be cold-rolled to 0.15mm and following target thickness, with after utilize tertiary recrystallization to obtain oriented silicon steel strip in razor-thin through 750 ~ 1000 DEG C of annealing; The defect that above-mentioned production technique exists is: the easy raw edges of strip, broken belt time cold rolling, and cold rolling efficiency is low; And current technology all needs to utilize the production board of oriented silicon steel as raw material, and the traditional mode of production flow process of oriented silicon steel exists the shortcomings such as product defects is many, lumber recovery is low, energy consumption is large, environmental pollution is serious.
Summary of the invention
The object of this invention is to provide a kind of very thin directional silicon steel and short route manufacture method thereof; The present invention makes full use of twin-roll thin strip continuous casting technology and secondary recrystallization method, obtains very thin oriented silicon steel, and the method has the feature of short route, easy to control, less energy-consumption.
The composition of very thin oriented silicon steel of the present invention is C 0.002 ~ 0.08% by mass percentage, Si 2.8 ~ 3.4%, Mn 0.05 ~ 0.30%, S 0.015 ~ 0.04%, Als 0.005 ~ 0.05%, N 0.003 ~ 0.010%, Cu 0 ~ 0.6%, Sn 0 ~ 0.2%, O<0.004%, P<0.01%, surplus is Fe.
The magnetic strength B of above-mentioned very thin oriented silicon steel
8be 1.72 ~ 1.83T.
The iron loss P of above-mentioned very thin oriented silicon steel
10/400be 6.6 ~ 8.1W/kg, P
10/1000be 19.2 ~ 27.2W/kg.
The thickness of above-mentioned very thin oriented silicon steel is at 0.05 ~ 0.15mm.
The short route manufacture method of very thin oriented silicon steel of the present invention is carried out according to the following steps:
The invention provides the manufacture method of above-mentioned very thin directional silicon steel, it comprises the steps:
1, smelting molten steel, molten steel composition is by mass percentage: C 0.002 ~ 0.08%, Si 2.8 ~ 3.4%, Mn 0.05 ~ 0.30%, S 0.015 ~ 0.04%, Als 0.005 ~ 0.05%, N 0.003 ~ 0.010%, Cu 0 ~ 0.6%, Sn 0 ~ 0.2%, O<0.004%, P<0.01%, surplus is Fe;
2, twin-roll thin strip continuous casting device is adopted, molten steel is poured in the cavity that is made up of two crystallization rolls and two pieces of side seal boards through tundish and forms molten bath, controlling molten bath upper surface superheating temperature is 10 ~ 70 DEG C, molten steel in molten bath solidifies along with the rotation of crystallization roll and derives with the speed of 20 ~ 60m/min, obtains Cast Strip;
3, hot rolling is carried out in Cast Strip after cooling unit cools with the speed of 20 ~ 100 DEG C/s, start rolling temperature is 900 ~ 1150 DEG C, and hot rolling draft is 15 ~ 50%, and finishing temperature is more than 800 DEG C, be cooled to less than 650 DEG C with the speed of 20 ~ 100 DEG C/s after hot rolling and batch, obtaining hot rolled coil;
4, hot rolled coil is carried out normalizing process, temperature is 850 ~ 1150 DEG C, and the time is 1 ~ 10min, carries out controlled cooling model after normalizing process, and speed of cooling is 5 ~ 50 DEG C/s, is cooled to normal temperature and obtains normalizing plate;
5, scale on surface is removed in the pickling of normalizing plate, then carry out once cold rolling, once cold rolling draft is 40 ~ 70%; Then carry out process annealing, temperature is 800 ~ 1100 DEG C, and the time is 3 ~ 10min, obtains process annealing plate;
6, scale on surface is removed in the pickling of process annealing plate, then carry out secondary cold-rolling, secondary cold-rolling draft is 70 ~ 98%; Then carry out decarburizing annealing, temperature is 800 ~ 900 DEG C, and the time is 3 ~ 10min;
7, the plate surface coating annealing separating agent after decarburizing annealing;
8, the sheet material of coating annealing separating agent is heated to 800 ± 10 DEG C, then be warming up to 1200 ± 10 DEG C with the speed of 10 ~ 30 DEG C/h and complete high temperature annealing, at least 20h is incubated again at 1200 ± 10 DEG C, complete sublimate annealing, finally by uncoiling, smooth stretching annealing and insulation layer coating, make very thin directional silicon steel.
The width of above-mentioned Cast Strip is 100 ~ 2000mm.
In aforesaid method, in molten bath, the contact arc length of molten steel and crystallization roll roll surface is 100 ~ 250mm, and the height in molten bath is 80 ~ 220mm.
In aforesaid method, atmosphere during process annealing is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
In aforesaid method, atmosphere during decarburizing annealing is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
In aforesaid method, atmosphere during high temperature annealing is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 75%, and atmosphere during sublimate annealing is hydrogen atmosphere.
Twin-roll thin strip continuous casting is with the cooling roller of two reverse rotations for crystallizer, by the technology of liquid metal direct production thin strip.The Sub realizable fuzzy matrix (10 utilizing it to have
2~ 10
4dEG C/s) characteristic, can in the base of Cast Strip the more inhibitor forming element of solid solution, thus obtain more, more disperse, more tiny inhibitor particle, improve restraint.In addition, the Cast Strip base thickness utilizing strip continuous casting technology to obtain is generally only 1 ~ 5mm, much smaller than conventional thickness of strand (50 ~ 200mm), greatly can simplify hot-rolled process.These all will be conducive to preparing very thin directional silicon steel.Visible, production twin-roll thin strip continuous casting technology being applied to very thin directional silicon steel has unrivaled superiority.
Feature of the present invention and beneficial effect are:
(1) based on twin-roll thin strip continuous casting technology, utilize secondary recrystallization method to prepare the thick very thin directional silicon steel of 0.05 ~ 0.15mm, breach traditional tertiary recrystallization preparation method;
(2) do not add other elements, only utilize conventional AlN and MnS as inhibitor, the quantity of inhibitor particle more easy to control, distribution and size under thin strap continuous casting condition;
(3) enormously simplify the technological process of production of very thin oriented silicon steel, manufacture method is simple, effectively, there is the feature of short route, easy to control, less energy-consumption.
Accompanying drawing explanation
Fig. 1 is the short route manufacture method schematic flow sheet of very thin directional silicon steel of the present invention.
Embodiment
Contact arc length in the embodiment of the present invention and comparative example is 100 ~ 250mm, and the height in molten bath is 80 ~ 220mm.
The crystallization roll diameter of the double roller continuous casting device adopted in the embodiment of the present invention and comparative example is 500 ~ 1000mm.
The width of the Cast Strip obtained in the embodiment of the present invention and comparative example is 100 ~ 2000mm.
In the embodiment of the present invention and comparative example, the magnetic property data of product adopt monolithic testing method to test to obtain on MATS-2010M type magnetism testing instrument.
The annealing separating agent adopted in the embodiment of the present invention is magnesium oxide.
In the embodiment of the present invention, atmosphere during process annealing is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
In the embodiment of the present invention, atmosphere during decarburizing annealing is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
In the embodiment of the present invention, atmosphere during high temperature annealing is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 75%, and atmosphere during sublimate annealing is hydrogen atmosphere.
embodiment 1
The molten steel composition of very thin directional silicon steel is C 0.04%, Si 3.0%, Mn 0.18%, S 0.022%, Als 0.025%, N 0.0095%, O<0.004%, P<0.01% according to mass percent, and surplus is Fe; Magnetic strength B
8for 1.80T, iron loss P
10/400for 6.6W/kg, P
10/1000be 22.0 W/kg, thickness 0.1mm;
Smelting molten steel, composition is the same;
Adopt twin-roll thin strip continuous casting device, molten steel is poured in the cavity that is made up of two crystallization rolls and two pieces of side seal boards through tundish and forms molten bath, controlling molten bath upper surface superheating temperature is 40 DEG C, and the molten steel in molten bath solidifies along with the rotation of crystallization roll and derives with the speed of 40m/min, obtains Cast Strip;
Cast Strip is through cooling unit to carry out hot rolling after the cooling of the speed of 60 DEG C/s, and start rolling temperature is 1000 DEG C, and hot rolling draft is 33.3%, and finishing temperature, more than 800 DEG C, is cooled to less than 650 DEG C with the speed of 60 DEG C/s after hot rolling and batches, and obtains hot rolled coil;
Hot rolled coil is carried out normalizing process, and temperature is 1000 DEG C, and the time is 5min, carries out controlled cooling model after normalizing process, and speed of cooling is 25 DEG C/s, is cooled to normal temperature and obtains normalizing plate;
Scale on surface is removed in the pickling of normalizing plate, and then carry out once cold rolling, once cold rolling draft is 50%; Then carry out process annealing, temperature is 950 DEG C, and the time is 6min, obtains process annealing plate;
Scale on surface is removed in the pickling of process annealing plate, and then carry out secondary cold-rolling, secondary cold-rolling draft is 88%; Then carry out decarburizing annealing, temperature is 850 DEG C, and the time is 6min;
Plate surface coating annealing separating agent after decarburizing annealing;
The sheet material of coating annealing separating agent is heated to 800 ± 10 DEG C, then be warming up to 1200 ± 10 DEG C with the speed of 20 DEG C/h and complete high temperature annealing, then at 1200 ± 10 DEG C of insulation 20h, complete sublimate annealing, finally by uncoiling, smooth stretching annealing and insulation layer coating, make very thin directional silicon steel;
Adopt the molten steel of heterogeneity to carry out contrast experiment in a manner described, composition is C 0.05%, Si 3.1%, Mn 0.04% according to mass percent, S 0.05%, Als 0.01%, N 0.02%, O<0.004%, P<0.01%, surplus is Fe; The silicon steel sheet magnetic strength B obtained
8for 1.66T, iron loss P
10/400for 11.2W/kg, P
10/1000be 28.5 W/kg.
embodiment 2
The molten steel composition of very thin directional silicon steel is C 0.002%, Si 2.8%, Mn 0.05%, S 0.015% according to mass percent, Als 0.005%, N 0.003%, Cu 0.3%, Sn 0.1%, O<0.004%, P<0.01%, surplus is Fe; Magnetic strength B
8for 1.72T, iron loss P
10/400for 8.1W/kg, P
10/1000for 19.2W/kg, thickness 0.05mm;
Manufacture method is with embodiment 1, and difference is:
(1) smelting molten steel, composition is the same;
(2) upper surface superheating temperature in molten bath is 10 DEG C, and molten steel is derived with the speed of 60m/min;
(3) Cast Strip is with the cooling of the speed of 20 DEG C/s, and hot rolling start rolling temperature is 900 DEG C, and draft is 15%, cools after hot rolling with the speed of 20 DEG C/s;
(4) normalizing treatment temp is 850 DEG C, and the time is 10min, and normalizing process speed of cooling is 5 DEG C/s;
(5) once cold rolling draft is 40%; Intermediate anneal temperature is 800 DEG C, and the time is 10min;
(6) secondary cold-rolling draft is 98%; Decarburization annealing temperature is 800 DEG C, and the time is 10min;
(7) sheet material of coating annealing separating agent is heated to 800 ± 10 DEG C, is then warming up to 1200 ± 10 DEG C with the speed of 10 DEG C/h and completes high temperature annealing, then at 1200 ± 10 DEG C of insulation 24h, complete sublimate annealing;
Adopt the molten steel of heterogeneity to carry out contrast experiment in a manner described, composition is C 0.06%, Si 3.0%, Mn 0.4% according to mass percent, S 0.03%, Als 0.03%, N 0.009%, O<0.004%, P<0.01%, surplus is Fe; The silicon steel sheet magnetic strength B obtained
8for 1.62T, iron loss P
10/400for 11.1W/kg, P
10/1000for 29.7W/kg.
embodiment 3
The molten steel composition of very thin directional silicon steel is C 0.08%, Si 3.4%, Mn 0.30%, S 0.04% according to mass percent, Als 0.05%, N 0.007%, Cu 0.6%, Sn 0.2%, O<0.004%, P<0.01%, surplus is Fe; Magnetic strength B
8for 1.83T, iron loss P
10/400be 7.1 W/kg, P
10/1000for 27.2W/kg, thickness 0.15mm;
Manufacture method is with embodiment 1, and difference is:
(1) smelting molten steel, composition is the same;
(2) upper surface superheating temperature in molten bath is 70 DEG C, and molten steel is derived with the speed of 20m/min;
(3) Cast Strip is with the cooling of the speed of 100 DEG C/s, and hot rolling start rolling temperature is 1150 DEG C, and draft is 50%, cools after hot rolling with the speed of 100 DEG C/s;
(4) normalizing treatment temp is 1150 DEG C, and the time is 1min, and normalizing process speed of cooling is 50 DEG C/s;
(5) once cold rolling draft is 70%; Intermediate anneal temperature is 1100 DEG C, and the time is 3min;
(6) secondary cold-rolling draft is 70%; Decarburization annealing temperature is 900 DEG C, and the time is 3min;
(7) sheet material of coating annealing separating agent is heated to 800 ± 10 DEG C, is then warming up to 1200 ± 10 DEG C with the speed of 30 DEG C/h and completes high temperature annealing, then at 1200 ± 10 DEG C of insulation 22h, complete sublimate annealing;
Adopt the molten steel of heterogeneity to carry out contrast experiment in a manner described, composition is C 0.07%, Si 2.9%, Mn 0.032% according to mass percent, S 0.06%, Als 0.11%, N 0.02%, Cu 0.3%, O<0.004%, P<0.01%, surplus is Fe; The silicon steel sheet magnetic strength B obtained
8for 1.67T, iron loss P
10/400for 10.7W/kg, P
10/1000be 30.9 W/kg.
Claims (7)
1. a very thin directional silicon steel, is characterized in that composition is C 0.002 ~ 0.08%, Si 2.8 ~ 3.4% by mass percentage, Mn 0.05 ~ 0.30%, S 0.015 ~ 0.04%, Als 0.005 ~ 0.05%, N 0.003 ~ 0.010%, Cu 0 ~ 0.6%, Sn 0 ~ 0.2%, O<0.004%, P<0.01%, surplus is Fe, thickness at 0.05 ~ 0.15mm, magnetic strength B
8be 1.72 ~ 1.83T.
2. the very thin directional silicon steel of one according to claim 1, is characterized in that the iron loss P of this steel plate
10/400be 6.6 ~ 8.1W/kg, P
10/1000be 19.2 ~ 27.2W/kg.
3. a short route manufacture method for very thin directional silicon steel according to claim 1, is characterized in that carrying out according to the following steps:
(1) smelting molten steel, molten steel composition is by mass percentage: C 0.002 ~ 0.08%, Si 2.8 ~ 3.4%, Mn 0.05 ~ 0.30%, S 0.015 ~ 0.04%, Als 0.005 ~ 0.05%, N 0.003 ~ 0.010%, Cu 0 ~ 0.6%, Sn 0 ~ 0.2%, O<0.004%, P<0.01%, surplus is Fe;
(2) twin-roll thin strip continuous casting device is adopted, molten steel is poured in the cavity that is made up of two crystallization rolls and two pieces of side seal boards through tundish and forms molten bath, controlling molten bath upper surface superheating temperature is 10 ~ 70 DEG C, molten steel in molten bath solidifies along with the rotation of crystallization roll and derives with the speed of 20 ~ 60m/min, obtains Cast Strip;
(3) hot rolling is carried out in Cast Strip after cooling unit cools with the speed of 20 ~ 100 DEG C/s, start rolling temperature is 900 ~ 1150 DEG C, and hot rolling draft is 15 ~ 50%, and finishing temperature is more than 800 DEG C, be cooled to less than 650 DEG C with the speed of 20 ~ 100 DEG C/s after hot rolling and batch, obtaining hot rolled coil;
(4) hot rolled coil is carried out normalizing process, temperature is 850 ~ 1150 DEG C, and the time is 1 ~ 10min, carries out controlled cooling model after normalizing process, and speed of cooling is 5 ~ 50 DEG C/s, is cooled to normal temperature and obtains normalizing plate;
(5) scale on surface is removed in the pickling of normalizing plate, then carry out once cold rolling, once cold rolling draft is 40 ~ 70%; Then carry out process annealing, temperature is 800 ~ 1100 DEG C, and the time is 3 ~ 10min, obtains process annealing plate;
(6) scale on surface is removed in the pickling of process annealing plate, then carry out secondary cold-rolling, secondary cold-rolling draft is 70 ~ 98%; Then carry out decarburizing annealing, temperature is 800 ~ 900 DEG C, and the time is 3 ~ 10min;
(7) the plate surface coating annealing separating agent after decarburizing annealing;
(8) sheet material of coating annealing separating agent is heated to 800 ± 10 DEG C, then be warming up to 1200 ± 10 DEG C with the speed of 10 ~ 30 DEG C/h and complete high temperature annealing, at least 20h is incubated again at 1200 ± 10 DEG C, complete sublimate annealing, finally by uncoiling, smooth stretching annealing and insulation layer coating, make very thin directional silicon steel.
4. the short route manufacture method of very thin directional silicon steel according to claim 3, in the molten bath that it is characterized in that step (2), the contact arc length of molten steel and crystallization roll roll surface is 100 ~ 250mm, and the height in molten bath is 80 ~ 220mm.
5. the short route manufacture method of very thin directional silicon steel according to claim 3, atmosphere when it is characterized in that the process annealing of step (5) is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
6. the short route manufacture method of very thin directional silicon steel according to claim 3, atmosphere when it is characterized in that step (6) decarburizing annealing is the mixed atmosphere of hydrogen and nitrogen, and the volume percent of hydrogen is 50%, and the dew point of mixed gas is 20 ~ 45 DEG C.
7. the short route manufacture method of very thin directional silicon steel according to claim 3, atmosphere when it is characterized in that the high temperature annealing of step (8) is the mixed atmosphere of hydrogen and nitrogen, the volume percent of hydrogen is 75%, and atmosphere during sublimate annealing is hydrogen atmosphere.
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| CN105950964A (en) * | 2016-05-24 | 2016-09-21 | 刘和来 | Non-oriented silicon steel for motor |
| CN107217198A (en) * | 2017-06-01 | 2017-09-29 | 东北大学 | A kind of method that rotation cube doubly oriented silicon steel is prepared based on thin strap continuous casting |
| CN107488815A (en) * | 2017-08-25 | 2017-12-19 | 包头钢铁（集团）有限责任公司 | A kind of medium temperature orientation silicon steel hot rolled strip and preparation method thereof |
| CN108339851A (en) * | 2017-12-21 | 2018-07-31 | 东北大学 | A kind of cold rolling of oriented silicon steel strip in razor-thin and method for annealing |
| CN108431267A (en) * | 2015-12-22 | 2018-08-21 | Posco公司 | Oriented electrical steel and preparation method thereof |
| CN110629127A (en) * | 2019-11-22 | 2019-12-31 | 东北大学 | Method for manufacturing invar alloy foil |
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| CN115896596A (en) * | 2022-11-15 | 2023-04-04 | 国网智能电网研究院有限公司 | Ultrathin oriented silicon steel and preparation method thereof |
| CN117737594A (en) * | 2024-02-19 | 2024-03-22 | 内蒙古矽能电磁科技有限公司 | Rare earth-containing ultrathin oriented silicon steel and preparation method thereof |
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