CN102936644B - Method for improving magnetic property of twin roll strip casting non-oriented electrical steel - Google Patents
Method for improving magnetic property of twin roll strip casting non-oriented electrical steel Download PDFInfo
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- CN102936644B CN102936644B CN201210491627.2A CN201210491627A CN102936644B CN 102936644 B CN102936644 B CN 102936644B CN 201210491627 A CN201210491627 A CN 201210491627A CN 102936644 B CN102936644 B CN 102936644B
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 title abstract 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005097 cold rolling Methods 0.000 claims abstract description 18
- 230000006698 induction Effects 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000002425 crystallisation Methods 0.000 claims description 25
- 230000008025 crystallization Effects 0.000 claims description 25
- 238000009749 continuous casting Methods 0.000 claims description 22
- 238000005554 pickling Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 21
- 238000000137 annealing Methods 0.000 abstract description 14
- 238000005096 rolling process Methods 0.000 abstract description 6
- 238000000265 homogenisation Methods 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 11
- 238000001953 recrystallisation Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000011162 core material Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000002244 precipitate Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a production method of non-oriented electrical steel, in particular to a method for improving the magnetic property of twin roll strip casting non-oriented electrical steel. The method comprises the following steps of: firstly, preparing a casting strip, and thermally rolling the casting strip at a temperature of 900-1150 DEG C through an online hot mill, wherein the hot rolling deformation is 26-60 percent; then coiling at a temperature of 650-780 DEG C; then performing acid-washing and cold-rolling, annealing for 0.5-5 minutes at a temperature of 1000-1100 DEG C, and carrying out coating processing to obtain a twin roll strip casting non-oriented electrical steel sheet, wherein the iron loss P1.5/50 is at least reduced by 0.35W/kg and the magnetic induction strength B50 is improved by 0.01-0.03T. The method provided by the invention can be used for realizing homogenization and grain refining control of casting strip tissues, is improved in plasticity, plate shape and surface quality of the casting strip, provides a convenient condition for the subsequent cold rolling procedure, and ensures that the iron loss P1.5/50 of a twin roll strip casting non-oriented electrical steel finished plate is reduced by above 0.35W/kg and the magnetic induction strength B50 is improved by 0.01-0.03T.
Description
Technical field
The present invention relates to a kind of production method of non-oriented electrical steel, relate in particular to a kind of method that improves twin-roll thin strip continuous casting non-oriented electrical steel magnetic property.
Background technology
Non-oriented electrical steel uses mainly as the core material of various motors.Core loss and magnetic induction density are two key indexs evaluating non-oriented electrical steel magnetic property, core loss refers to the invalid electric energy that iron core consumes while magnetization under >=50Hz alternating magnetic field, be called for short iron loss, also claim alternate iron losses, its unit is W/kg, comprise magnetic hysteresis loss, eddy-current loss and unusual loss three parts, this because flux change is subject to the invalid electric energy that various obstructions consume, generate heat and both lose electric energy by iron core, cause again the temperature rise of motor and transformer, electrical sheet iron loss is low, both a large amount of electric energy can have been saved, can extend again motor and transformer work runtime, and simplify refrigerating unit.Magnetic induction density is the magnetic figure passing through on the iron core unit cross-sectional area of motor, also claims magneticflux-density, and it represents the magnetizability of material, unit is T, and magnetic induction density is high, and the magnetizing current of iron core reduces, copper loss and iron loss all decline, can save electric energy, in addition, magnetic induction density is high, also can improve the maximum magnetic induction of design, dwindle core section long-pending, make that core volume reduces, weight saving, reduce total loss and the manufacturing cost of motor.Energy waste when reducing motor rotation, improve electrical efficiency, must improve the magnetic property of non-oriented electromagnetic steel sheet, improve magnetic induction density, reduce core loss, the key that improves non-oriented electrical steel magnetic induction density is to obtain strong useful recrystallization texture, as { 001}<010>, { 001}<210>, { 001}<110>, { 110}<001> etc., the key that reduces non-oriented electrical steel core loss is to obtain thick and uniform recrystallized structure, strong useful recrystallization texture also promotes precipitate coarsening.
To be a kind of crystallization roll that utilizes two rotations become liquid metal direct pouring strip, can save heating process and significantly simplify the nearly end form forming technique of short flow process of hot-rolled process twin-roll thin strip continuous casting, has the advantage such as energy-saving and environmental protection, low cost.Twin-roll thin strip continuous casting has the feature of molten steel rapid solidification, and it is up to 10
2~ 10
4dEG C/speed of cooling of s makes the solidified structure of Cast Strip, texture be different from conventional continuous casting heavy slab.Find through retrieval, Chinese patent 201010539203.X, 201010539378.0 discloses the control method of twin-roll thin strip continuous casting non orientating silicon steel Cast Strip solidified structure and texture, but the impact of follow-up rolling and annealing operation is not described, the crystal grain of the non-oriented electrical steel Cast Strip of twin-roll thin strip continuous casting explained hereafter is extremely thick, plasticity and plate shape are all poor, direct cold rolling difficulty, the patent of the twin-roll thin strip continuous casting non-oriented electrical steel of Japanese kokai publication hei 6-31395, a kind of method that improves Cast Strip plasticity and toughness on crystallization roll by exerting pressure is disclosed, although the method makes, the lattice defect of Cast Strip reduces, toughness improves, but because the Cast Strip temperature of just having solidified is all more than 1400 DEG C, intensity is low, plasticity is poor, improves casting-rolling force and can cause surface transverse cracks, plate shape to be worsened, and affects the carrying out of follow-up rolling process, Chinese patent 02112304.7 discloses a kind of method of utilizing twin-roll thin strip continuous casting to manufacture high-performance non-oriented electrical steel, its main points are to be that 5% ~ 25% online hot rolling is to improve toughness and the finished product magnetic property of Cast Strip by Cast Strip being carried out to deflection, but, the method has only been pointed out the effect of online hot rolling, not by online hot rolling and continuous casting, the operations such as annealing combine, do not excavate under thin strap continuous casting whole process condition and (solidify, hot rolling, batch, cold rolling, annealing process) tissue, the advantage of texture control and potentiality, be unfavorable for the raising of production board magnetic property, in addition, because hot rolling deformation amount is less, therefore the thinning effect to Cast Strip tissue is bad, improvement degree to Cast Strip toughness is limited, in follow-up cold-rolled process, still can cause limit to split, affect carrying out smoothly of cold-rolling process, reduce lumber recovery.
Summary of the invention
For above-mentioned prior art existing problems, a kind of method that improves twin-roll thin strip continuous casting non-oriented electrical steel magnetic property of the present invention, object is plasticity, plate shape and the surface quality by improving Cast Strip, effectively improves the magnetic property of non-oriented electrical steel thin plate.
Realizing the technical scheme of the object of the invention carries out according to following steps:
(1) molten steel is poured into from tundish in the cavity being made up of the crystallization roll rotating and side seal board, form molten bath, in molten bath, the superheating temperature of molten steel is 30 ~ 80 DEG C, and molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is the Cast Strip that 1.5 ~ 4.0mm, width are 100 ~ 2000mm;
(2) Cast Strip through in-line hot rolling mill in 900 ~ 1150 DEG C of hot rollings, hot rolling deformation amount is 26 ~ 60%, then batch in 650 ~ 780 DEG C, then through pickling, cold rolling, in 1000 ~ 1100 DEG C of anneal 0.5 ~ 5min, through coating processing, obtain twin-roll thin strip continuous casting non-oriented electrical steel thin plate, compared with existing twin-roll thin strip continuous casting non-oriented electrical steel thin plate, its iron loss P1.5/50 at least reduces by 0.35 W/kg, and magnetic induction density B 50 improves 0.01 ~ 0.03T.
Compared with prior art, feature of the present invention is:
The superheating temperature of molten steel in molten bath is controlled at 30 ~ 80 DEG C by the inventive method, and object is to make Cast Strip before hot rolling, form thick and have a strong { solidified structure of 001}<0vw> texture;
The object of Cast Strip being carried out to hot rolling is improve the plasticity of Cast Strip and adjust hot rolling microstructure and texture, for follow-up cold rolling process ready, hot rolling start rolling temperature is too high or too low all will have a negative impact to tissue and texture, hot rolling deformation amount is too small, unfavorable to tissue and texture, affect finished product magnetic property, and increased follow-up cold rolling load; Hot rolling deformation amount is excessive, and hot rolls load increases, and plate shape is controlled difficult;
The object that Cast Strip is batched is to make hot rolling microstructure homogenizing, precipitate alligatoring.Coiling temperature is too low is unfavorable for microstructure homogenization and precipitate alligatoring, and coiling temperature is too high, and Cast Strip surface oxidation is serious, is unfavorable for follow-up pickling;
The object of annealing is to form thick, uniform recrystallized structure and favourable recrystallization texture.Annealing temperature is too low, annealing time is too short all unfavorable to tissue and texture, affects product magnetic property; Annealing temperature is too high, annealing time is long will increase the weight of annealing furnace burden, increase production cost.
The invention has the beneficial effects as follows:
(1) the present invention, by non-oriented electrical steel Cast Strip is carried out online hot rolling and batched, has realized homogenizing and grain refining control to Cast Strip tissue, has improved plasticity, plate shape and the surface quality of Cast Strip, is the follow-up cold rolling process condition of providing convenience;
(2) the present invention has thick recrystallized structure and strong { 001}<010>, { the non-oriented electrical steel thin plate of 110}<001> recrystallization texture by the control of the online start rolling temperature in Cast Strip, hot rolling deformation amount, coiling temperature and annealing temperature having been realized to the Effective Regulation to production board recrystallized structure and recrystallization texture, can having produced;
(3) production technique of the present invention is simple, can make more than the iron loss P1.5/50 of thin strap continuous casting non-oriented electrical steel reduces by 0.35 W/kg, and magnetic induction density B 50 improves 0.01 ~ 0.03T.
Brief description of the drawings
Fig. 1 process flow diagram of preparing twin-roll thin strip continuous casting non-oriented electrical steel of the present invention;
Wherein: 1: tundish; 2: molten bath; 3: crystallization roll; 4: Cast Strip; 5: cooling unit; 6: hot rolling unit; 7: reeling machine; 8: hot rolled coil; 9: pickling and cold-rolling associating unit; 10: annealing coating combination machine group
The micro-organization chart of non-oriented electrical steel production board prepared by Fig. 2 embodiment of the present invention 1;
The marcotexture figure of non-oriented electrical steel production board prepared by Fig. 3 embodiment of the present invention 1;
The micro-organization chart of non-oriented electrical steel production board prepared by Fig. 4 comparative example;
The marcotexture figure of non-oriented electrical steel production board prepared by Fig. 5 comparative example.
Embodiment
The technological process of preparing twin-roll thin strip continuous casting non-oriented electrical steel of the present invention as shown in Figure 1, its technological process is: the molten steel in tundish 1 flows into behind molten bath 2, molten steel contacts and forms scull with the crystallization roll 3 of two rotations, molten steel solidifies rear formation Cast Strip 4 completely, Cast Strip 4 is cooling through cooling unit 5, carry out on-line continuous hot rolling through hot rolling unit 6 again, then after being batched by reeling machine 7, obtain hot rolled coil 8, hot rolled coil 8 completes pickling and cold rolling operation through pickling and cold-rolling associating unit 9, finally, complete annealing and coating processing through annealing coating combination machine group 10, obtain high-performance non-oriented electromagnetic steel sheet.
The molten steel composition of preparing non-oriented electrical steel (mass percent) adopting in the embodiment of the present invention: C ﹤ 0.004, Si 2.70 ~ 3.40, Mn 0.10 ~ 0.50, P ﹤ 0.01, S ﹤ 0.004, N ﹤ 0.004, Al 0.2 ~ 0.8, surplus is Fe and impurity.
Embodiment 1
(1) molten steel is poured into from tundish in the cavity being made up of the crystallization roll rotating and side seal board, form molten bath, in molten bath, the superheating temperature of molten steel is 50 DEG C, and molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is the Cast Strip that 2.0mm, width are 250mm;
(2) Cast Strip through in-line hot rolling mill in 1150 DEG C of hot rollings, hot rolling deformation amount is 50%, batch in 700 DEG C again, then through pickling, cold rolling, in 1100 DEG C of anneal 2min, through coating processing, obtain the twin-roll thin strip continuous casting non-oriented electrical steel light sheet products that 0.35mm is thick, its average iron loss P1.5/50=2.70W/kg, magnetic induction density B 50=1.72T.
The microstructure of non-oriented electrical steel production board prepared by the present embodiment is shown in Fig. 2, and the non-oriented electrical steel production board that as can be seen from Figure 2 prepared by the inventive method has thick and uniform recrystallized structure, and average grain size is 153.3 μ m.Marcotexture (the φ of non-oriented electrical steel production board prepared by the present embodiment
2=45 °) see Fig. 3, level of density: 2.0,2.5,3.0,3.5,4.0,5.0,6.0,7.0, the non-oriented electrical steel production board that as can be seen from Figure 3 prepared by the inventive method has strong { 001}<010>, { 110}<001> recrystallization texture.
Embodiment 2
(1) molten steel is poured into from tundish in the cavity being made up of the crystallization roll rotating and side seal board, form molten bath, in molten bath, the superheating temperature of molten steel is 30 DEG C, and molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is the Cast Strip that 1.5mm, width are 100mm;
(2) Cast Strip through in-line hot rolling mill in 1000 DEG C of hot rollings, hot rolling deformation amount is 26%, batch in 650 DEG C again, then through pickling, cold rolling, in 1000 DEG C of anneal 5min, through coating processing, obtain the twin-roll thin strip continuous casting non-oriented electrical steel light sheet products that 0.35mm is thick, its average iron loss P1.5/50=2.85W/kg, magnetic induction density B 50=1.73T.
(1) molten steel is poured into from tundish in the cavity being made up of the crystallization roll rotating and side seal board, form molten bath, in molten bath, the superheating temperature of molten steel is 80 DEG C, and molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is the Cast Strip that 4.0mm, width are 2000mm;
(2) Cast Strip through in-line hot rolling mill in 900 DEG C of hot rollings, hot rolling deformation amount is 60%, batch in 780 DEG C again, then through pickling, cold rolling, in 1050 DEG C of anneal 0.5min, through coating processing, obtain the twin-roll thin strip continuous casting non-oriented electrical steel light sheet products that 0.35mm is thick, its average iron loss P1.5/50=2.80W/kg, magnetic induction density B 50=1.71T.
comparative example
Molten steel is poured into from tundish in the cavity being made up of the crystallization roll rotating and side seal board, form molten bath, in molten bath, the superheating temperature of molten steel is 50 DEG C, molten steel contacts with crystallization roll scull occurs, deriving thickness from crystallization roll is 2.0mm, width is the Cast Strip of 250mm, Cast Strip directly enters reeling machine and completes and batch operation after cooling unit is cooling, coiling temperature is 700 DEG C, after curling, after pickling, carry out cold rolling, obtain the cold-reduced sheet that 0.35mm is thick, 2min again anneals cold-reduced sheet under 1100 DEG C of conditions, after coating, obtain non-oriented electromagnetic steel sheet product, production board horizontal stroke, longitudinally average magnetic induction intensity B50=1.70T, average iron loss P1.5/50=3.20W/kg.
The microstructure of non-oriented electrical steel production board prepared by this comparative example is shown in Fig. 4, and the non-oriented electrical steel production board that as can be seen from Figure 4 prepared by this comparative example has tiny and inhomogeneous recrystallized structure, and average grain size is only 66.7 μ m.Marcotexture (the φ of non-oriented electrical steel production board prepared by this comparative example
2=45 °) see Fig. 5, level of density: 2.0,2.5,3.0,3.5,4.0,5.0,6.0,7.0, as can be seen from Figure 5 the non-oriented electrical steel production board that prepared by this comparative example has that strong { 111}<112> recrystallization texture does not exist { 110}<001> recrystallization texture.
Claims (1)
1. improve a method for twin-roll thin strip continuous casting non-oriented electrical steel magnetic property, carry out according to following steps:
(1) by composition by mass percent be: C ﹤ 0.004, Si2.70～3.40, Mn0.10～0.50, P ﹤ 0.01, S ﹤ 0.004, N ﹤ 0.004, Al0.2～0.8, surplus is that the molten steel of Fe and impurity pours into from tundish in the cavity being made up of the crystallization roll rotating and side seal board, form molten bath, in molten bath, the superheating temperature of molten steel is 30～80 DEG C, and molten steel contacts with crystallization roll scull occurs, and deriving thickness from crystallization roll is the Cast Strip that 1.5～4.0mm, width are 100～2000mm;
It is characterized in that:
(2) Cast Strip through in-line hot rolling mill in 900～1150 DEG C of hot rollings, hot rolling deformation amount is 26～60%, then batch in 650～780 DEG C, then through pickling, cold rolling, in 1000～1100 DEG C of anneal 0.5～5min, through coating processing, obtain twin-roll thin strip continuous casting non-oriented electrical steel thin plate, pour into from tundish in the cavity being formed by the crystallization roll rotating and side seal board with molten steel, form molten bath, in molten bath, the superheating temperature of molten steel is 50 DEG C, molten steel contacts with crystallization roll scull occurs, deriving thickness from crystallization roll is 2.0mm, width is the Cast Strip of 250mm, Cast Strip directly enters reeling machine and completes and batch operation after cooling unit is cooling, coiling temperature is 700 DEG C, after curling, after pickling, carry out cold rolling, obtain the cold-reduced sheet that 0.35mm is thick, 2min again anneals cold-reduced sheet under 1100 DEG C of conditions, after coating, obtaining non-oriented electromagnetic steel sheet product compares, its iron loss P1.5/50 at least reduces 0.35W/kg, magnetic induction density B 50 improves 0.01～0.03T.
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| CN104762551B (en) * | 2015-04-15 | 2017-09-01 | 江苏沙钢集团有限公司 | Manufacturing method of thin-strip continuous casting high-magnetic-induction non-oriented silicon steel |
| CN116786772A (en) * | 2022-03-18 | 2023-09-22 | 纽科尔公司 | Electrical steel |
| CN117305717B (en) * | 2023-11-27 | 2024-03-05 | 张家港扬子江冷轧板有限公司 | Preparation method of non-oriented silicon steel |
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| CN102069165B (en) * | 2010-11-11 | 2013-03-13 | 东北大学 | Method for preparing non-oriented silicon steel columnar crystal thin strip blank by twin-roll thin strip continuous casting |
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