CN100418697C - High magentic induction oriented electrical steel sheet and its manufacturing method - Google Patents
High magentic induction oriented electrical steel sheet and its manufacturing method Download PDFInfo
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Abstract
The present invention relates to a high magnetic induction oriented electrical steel plate and a manufacture method thereof. The present invention has the technical scheme that a plate blank of a new steel grade is heated to the temperature of 1200 to 1320 DEG C, the temperature is preserved for 2 to 5 hours, and then the hot rolling, the quick cooling and the coiling of the plate blank are carried out, and the cooling speed is from 10 to 200DEG C/second; the plate blank is rolled according to a secondary cold rolling method, the plate thickness is not larger than 0.30mm; the decarburizing annealing is carried out, a magnesium oxide isolation layer is coated on the plate blank, the plate blank is coiled, and finally, the high temperature annealing is carried out. The chemical components of the plate blank of the new steel grade comprises: 0.03 to 0.050 wt% of C, 2.9 to 3.3 wt% of Si, 0.001 to 0.04 wt% of Als, 0.01 to 0.12 wt% of Nb, 0.004 to 0.012 wt% of N, at most 0.015 wt% of P, the rest comprises Fe and unavoidable foreign matter, and AlN and Nb (C, N) are used as inhibitors. The present invention omits hot rolling plate normalization (annealing), the manufacturing processes are simple, and the heating temperature and the ultimate high temperature annealing temperature are low; manufactured high magnetic induction oriented electrical steel plate has the characteristics of simple chemical components, high magnetic induction (not smaller than 1.89T), low iron loss and low manufacture cost.
Description
One, technical field:
The invention belongs to the oriented electrical steel technical field.Relate in particular to a kind of heavy slab process high magnetic induction oriented electrical steel sheet and manufacture method thereof.
Two, background technology
Electrical sheet is to make motor, transformer and ballast iron core and various electric elements in order to one of energy-conservation most important Metallic Functional Materials.The Gauss of the U.S. in 1934 (Goss) has applied for the patent of oriented electromagnetic steel plate production method, and the main feature of this method is to adopt MnS as inhibitor, utilizes the secondary cold-rolling method.In the production exploitation of oriented electrical steel, what be with historically new significance is the production of high magentic induction oriented electrical sheet (Hi-B).The characteristics of company of the Nippon Steel oriented electrical steel production patent of Japan are to utilize the once cold rolling method, and its core is exactly the control of AlN, comprise the control of smelting composition and hot rolled plate annealing conditions.
Present industrial production oriented electrical steel has three kinds of representative art: (1) is the secondary cold-rolling method of main inhibitor with MnS; (2) with AlN+MnS be inhibitor, implement the once cold rolling method of 〉=80% total reduction ratio; (3) with MnS (and/or MnSe)+Sb be the secondary cold-rolling method of inhibitor.In above-mentioned three kinds of technology, for guaranteeing to obtain stable high magnetic, must make the complete solid solution of inhibitor, must heat slab down at high temperature (about 1400 ℃).
In the oriented electromagnetic steel plate production technology, in order to control recrystallization process and to obtain certain texture, inhibitor is absolutely necessary.Traditional inhibitor is based on MnS, AlN, and in recent years, (Li Wenda: the inhibition in the cold-rolled orientation electrical sheet is special steel, 19 (1998), pp.1-7 to people mutually; T.Kubota, M.Fujikura, Y.Ushigami:Recent progressand future trend on grain-oriented silicon steel, Journal of Magnetism and MagneticMaterials, 215-216 (2000), pp.69-73:N.Takahashi, Y.Suga, H.Kobayashi:Recentdevelopments in oriented silicon steel, Journal of Magnetism and Magnetic Materials, 160 (1996), pp.98-101; S.Mishra, V.Kumar:Co-precipitation of copper-manganesesuiphide in Fe-3%Si steel, Materials Science and Engineering B32 (1995), pp.177-184: red legend English: slab low-temperature heat explained hereafter oriented electromagnetic steel plate, the Shanghai metal, 23 (2001), pp.33-37) when the low-temperature heat of research slab, for guaranteeing inhibitor intensity, added except that MnS, the precipitate that also adds other is separated out element as nitride and crystal boundary and is waited and strengthen inhibitor.
At present, the production method of industrial employing slab low-temperature heat technology is to be inhibitor with AlN, carried out nitriding and handle that (October 2,2001 for Fortunati et al:US patent, Patent No.US 6296719B1 before secondary recrystallization begins; Former gesture two youths etc.: microalloying improves the production method of the oriented electrical steel of annealing back magnetic strength, the Wuhan Iron and Steel Plant technology, and the 35 (1997), the 6th phase pp.48-50), was main inhibitor with AlN perhaps, with Cu
2S and MnS be auxiliary inhibitor (Chol Gyu Seung etal: low temperature slab heating process is adopted in Pu item oriented electrical steel production, the Wuhan Iron and Steel Plant technology, 35 (1997), the 8th phase, pp.48-50).Its means are exactly nitriding in steel, make it to combine with original element in the steel, are formed with the AlN precipitate of inhibitor function.The inhibitor that is adopted in the slab low-temperature heat technology is mainly AlN, because the solid solubility temperature of AlN is lower than MnS, is more suitable for realizing low-temperature heat.When slab heating temperature being dropped to 1150～1200 ℃,, must make corresponding composition adjustment and process modification for obtaining the glass-film that complete secondary recrystallization tissue, high magnetic are become reconciled by the AlN scheme.(Xiao Song starts etc. the Hi-B new technology of Nippon Steel research: the plain steel plate of the high い one directionality silicon of flux density manufacturing side, Int.c:C21D8/12, day disclosure special permission communique, special public clear 62240315.1987.02.21) characteristics are: be inhibitor with AlN, slab heating temperature drops to 1150～1250 ℃, is containing NH after the decarburizing annealing
3H
2+ N
2Carry out nitriding in the atmosphere and handle, adopt the once cold rolling method can produce the thick product of 0.18～0.50mm, and the easier new product of making no glass-film.It is that the oriented electrical steel technology of the low-carbon (LC) 1.5%Mn2.2%Si of inhibitor reduces slab heating temperature (He Zhongzhi writes, electrical sheet, Beijing: metallurgical industry publishing house, 1996,796,802-803,811-813,839-840 that Sumitomo Metal Industries propose with AlN; He Zhongzhi: the latest developments of electrical sheet, Metallic Functional Materials, 1997,4 (6): pp.243～245).It is main inhibitor that Korea S Pohang Iron and Steel Corporation proposes with AlN, Cu
2S and MnS are auxiliary inhibitor, slab is 1250～1320 ℃ of heating, (Chol Gyu Seung et al: low temperature slab heating process is adopted in Pu item oriented electrical steel production to produce general oriented electrical steel and high magentic induction oriented electrical sheet technology, the Wuhan Iron and Steel Plant technology, 35 (1997), the 8th phase, pp.48-50).Its slab composition is: C is 0.035%～0.05%, Si is 2.9%～3.3%, P＜0.015%, Als are 0.011%～0.017%, N is 0.008%～0.012%, S＜0.007%, Ni and/or Cr are 0.06%～0.08%, Mn is 0.32%, Cu＜0.6% and Mn/S 〉=20.0, Cu/Mn＞1.5.
The strand high temperature heating process that the industrial production oriented electrical steel adopts always can obtain stable high magnetic, but that shortcoming is an oxidizing slag is many, and the scaling loss amount can reach 5%, and lumber recovery is low; Will often clear up furnace bottom, output reduces; The fuel cost height; Furnace life is short; The manufacturing cost height; Surface defects of products is many.
The production of oriented electrical steel all attempts to reduce the heating-up temperature of strand: the main method that Nippon Steel and Sumitomo Metal Industries reduce slab heating temperature is main inhibitor with AlN, carries out nitriding and handles, and process procedure is many, technical sophistication, difficulty height; Korea S Pohang Iron and Steel Corporation is main inhibitor with AlN, Cu
2S and MnS are complicated component, heating-up temperature height, the final annealing temperature height of auxiliary inhibitor.
Three, summary of the invention
The purpose of this invention is to provide a kind of chemical composition simple, can omit hot rolled plate normalizing (annealing), low, the final high temperature anneal temperature of heating-up temperature is low, magnetic strength is high (〉=1.89T), a kind of heavy slab process high magnetic induction oriented electrical steel sheet and the manufacture method thereof of low, the low cost of manufacture of iron loss.
For achieving the above object, the technical solution adopted in the present invention is: a kind of new steel grade slab is heated to 1200～1320 ℃, is incubated 2～5 hours, carry out hot rolling, cool off fast and batch, cooling velocity is 10～200 ℃/second fast; Being rolling to thickness of slab by the secondary cold-rolling method again is≤0.30mm; Carry out decarburizing annealing then; Be coated with rolling behind the magnesia separation layer, carry out high annealing at last.The chemical composition of this new steel grade slab is, C is that 0.03～0.050wt%, Si are that 2.9～3.3wt%, Als are that 0.001～0.04wt%, Nb are that 0.01～0.12wt%, N are 0.004～0.012wt%, P for＜0.015wt%, all the other are Fe and unavoidable impurities, inhibitor be AlN and Nb (C, N); Slab thickness is 150～300mm.Wherein:
(C N) is one or more mixing precipitate among NbC, NbN, the Nb (CN) to inhibitor Nb.
The reduction ratio of last 1～3 passage of hot rolling is 10～30%, and finishing temperature is 800～1050 ℃, and rolling back relaxation time 1～600 second, relaxation are meant under the constant substantially situation of temperature and keep certain hour.Obtain precipitate then and organize all tiny evenly suitable hot-rolled coil, cancelled the normalizing annealing of hot-rolled coil.
The secondary cold-rolling method is for the first time cold rolling laggard interline annealing, the intermediate annealing temperature is 800～1050 ℃, in the nitrogen and hydrogen mixture atmosphere, carry out, enter in the stove by humidification, dew point is 1～50 ℃, time inside furnace is 5～3000 seconds, and cold rolling reduction ratio is 40～70% for the second time, and the interior thickness of secondary cold-rolling method is 0.50～0.90mm.
The temperature of decarburizing annealing is 800～900 ℃, carries out in the nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 25～55 ℃, and time inside furnace was less than 1 hour.
High annealing is heated to 600 ℃ with 10～100 ℃ of/hour firing rates again for quickly heating up to 400 ℃, is heated to 1100～1200 ℃ with 20 ℃/hour speed then, is incubated 15～30 hours, at last cooling; Adopting protective atmosphere 400～1200 ℃ of heating processes is N
225%+H
275%, the holding stage protective atmosphere is 100%H
2
Owing to adopt technique scheme, the present invention is by the chemical composition of the high magentic induction oriented electrical sheet of appropriate design, select AlN and Nb (C, N) be inhibitor, slab is heated 1200～1320 ℃ of temperature ranges, through hot rolling, cold rolling and heat treatment, especially obtain evenly tiny precipitate and tissue by controlling each reduction in pass of hot rolling and finishing temperature and hot rolling band relaxation and cooling.Therefore; the present invention only uses existing working condition and production equipment; can produce secondary recrystallization with (110) [001] high-orientation, magnetic strength height, oriented electrical steel that iron loss is low; can omit hot rolled plate normalizing annealing (normalizing); simplified production technology; final high temperature anneal temperature is reduced, reduced production cost, improved product quality.Mainly show:
1, because AlN and Nb (C, solid solubility temperature N) is lower than MnS, the present invention adopt AlN and Nb (C N) is inhibitor, slab heating temperature can not only be reduced to 1200～1320 ℃, also can adopt lower final annealing temperature (1100～1200 ℃),
2, can obtain evenly tiny precipitate and tissue by each reduction in pass of control hot rolling, finishing temperature, hot rolling band relaxation and quick cooling, therefore omit hot rolled plate normalizing annealing (normalizing).
3, by adjusting the content of Als, Nb, C, N, and by control hot rolling each reduction in pass, finishing temperature, hot rolling band relaxation and fast cooling obtain evenly tiny precipitate and tissue, can guarantee inhibitor intensity, can significantly suppress grain growth one time, obtain stabilized magnetic, can guarantee that magnetic is higher than general oriented electrical steel (B
10〉=1.89T) level, thus the manufacture method of oriented electrical steel improved, obtain the oriented electrical steel of high magnetic strength.
4, pass through to adjust the content of Si, Als, Nb, C, N, P, and adjust hot rolling, cold rolling and process of thermal treatment parameter, simplified production technology, can produce high magentic induction oriented electrical steel sheet.
Four, the specific embodiment
Below in conjunction with embodiment, the present invention is further described.
The manufacture method of 1 one kinds of high magentic induction oriented electrical steel sheets of embodiment
A kind of new steel grade slab, thickness of slab is 210mm, its chemical composition is: C is that 0.035wt%, Si are that 3.12wt%, Als are that 0.02wt%, Nb are that 0.04wt%, N are that 0.008wt%, P are 0.013wt%, all the other are for Fe and unavoidable impurities, and inhibitor is AlN and NbC.
With this slab such as heat to 1280 ℃, be incubated 2 hours; Carry out hot rolling again, the reduction ratio of last 3 passages of hot rolling technology is 10%, and finishing temperature is 850 ℃; Rolling back relaxation 60 seconds obtains precipitate and organizes all tiny and uniform hot-rolled coil, has cancelled the normalizing annealing of hot-rolled coil.Cool off fast then and batch, the cooling velocity of cooling is 30 ℃/second fast.Relaxation is meant under the constant substantially situation of temperature and keeps certain hour.
For the first time be cold rolled to 0.7mm, carry out intermediate annealing afterwards, the intermediate annealing temperature is 1000 ℃, carries out in the nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 20 ℃, and time inside furnace is 15 minutes.It is cold rolling to carry out the second time again, is rolled to 0.3mm, carries out decarburizing annealing then, and the temperature of decarburizing annealing is 850 ℃, carries out in the nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 40 ℃, and time inside furnace is 45～50 minutes.
Be coated with magnesia separation layer, rolling, high annealing at last, during the high annealing, quickly heat up to 400 ℃ earlier, be heated to 600 ℃ with 10～100 ℃/hour firing rate again, be heated to 1120 ℃ with 20 ℃/hour speed then, in the cooling after 30 hours of insulation under 1120 ℃ of conditions.The protective atmosphere that adopts is N in 400～1120 ℃ of heating processes
225%+H
275%, the holding stage protective atmosphere is 100%H
2
The heating-up temperature of present embodiment 1 and final high temperature anneal temperature be low, can omit hot rolled plate normalizing (annealing); Made high magentic induction oriented electrical steel sheet has that chemical composition is simple, magnetic strength is high, iron loss is low, the characteristics of low cost of manufacture.After measured, the result of slab chemical composition and finished product magnetic is as shown in table 1.
Table 1 slab composition and finished product magnetic
2 one kinds of high magentic induction oriented electrical steel sheets of embodiment and manufacture method thereof
A kind of new steel grade slab, thickness of slab are 210mm, and its chemical composition is: C is that 0.030wt%, Si are that 3.16wt%, Als are that 0.01wt%, Nb are that 0.07wt%, N are that 0.010wt%, P are 0.014wt%, all the other are for Fe and unavoidable impurities; Inhibitor is AlN and NbN.
This slab is heated to 1250 ℃, is incubated 2 hours; Carry out hot rolling again, the reduction ratio of last 2 passages of hot rolling technology is 25%, and finishing temperature is 1050 ℃, and rolling back relaxation 30 seconds obtains precipitate and organizes all tiny and uniform hot-rolled coil, the normalizing annealing of cancellation hot-rolled coil.Cool off fast then, the cooling velocity of cooling is 50 ℃/second fast.
For the first time be cold-rolled to 0.75mm, carry out intermediate annealing afterwards, the intermediate annealing temperature is 1000 ℃, carries out in the nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 10 ℃, and time inside furnace is 10～12 minutes.It is cold rolling to carry out the second time again, is rolled to 0.3mm, carries out decarburizing annealing after cold rolling, and the temperature of decarburizing annealing is carried out in 820 ℃, nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 30 ℃, and time inside furnace is 45～50 minutes.
Be coated with magnesia separation layer, rolling, high annealing at last.During the high annealing, quickly heat up to 400 ℃, be heated to 600 ℃ with 10～100 ℃/hour firing rate again, be heated to 1170 ℃ with 20 ℃/hour speed then, be incubated 25 hours, cooling.The protective atmosphere that is adopted in 400-1170 ℃ of heating process is N
225%+H
275%, the holding stage protective atmosphere is 100%H
2
Present embodiment heating-up temperature and final high temperature anneal temperature be low, can omit hot rolled plate normalizing (annealing); Made high magentic induction oriented electrical steel sheet has that chemical composition is simple, magnetic strength is high, iron loss is low, the characteristics of low cost of manufacture.After measured, the result of slab chemical composition and finished product magnetic is as shown in table 2.
Table 2 slab composition and finished product magnetic
3 one kinds of high magentic induction oriented electrical steel sheets of example and manufacture method thereof
A kind of new steel grade slab, thickness of slab is 210mm, its chemical composition is: C is that 0.050wt%, Si are that 3.18wt%, Als are that 0.01wt%, Nb are that 0.12wt%, N are that 0.010wt%, P are 0.014wt%, all the other are for Fe and unavoidable impurities, and inhibitor is AlN, NbC and NbN.
This slab is heated to 1300 ℃, is incubated 2 hours; Carry out hot rolling again, the reduction ratio of last 1 passage of hot rolling technology is 28%, and finishing temperature is 1000 ℃, rolling back relaxation 40 seconds.Cool off fast, the cooling velocity of cooling is 40 ℃/second fast again, obtains precipitate and organizes all tiny evenly suitable hot-rolled coil, the normalizing annealing of cancellation hot-rolled coil.
Carry out being cold rolled to the first time 0.83mm, carry out intermediate annealing afterwards, the intermediate annealing temperature is 1050 ℃, carries out in the nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 30 ℃, and time inside furnace is 5 minutes.It is cold rolling to carry out the second time again, is rolled to 0.3mm, carries out decarburizing annealing after cold rolling, and the decarburizing annealing temperature is 890 ℃, carries out in the nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 30 ℃, and time inside furnace is 15～20 minutes.
Be coated with magnesia separation layer, rolling, high annealing at last.During the high annealing, quickly heat up to 400 ℃ earlier, be heated to 600 ℃ with 10～100 ℃ of/hour firing rates again, be heated to 1190 ℃ with 20 ℃/speed at one hour rating then, be incubated 20 hours, cooling.The protective atmosphere that is adopted in 400～1190 ℃ of heating processes is N
225%+H
275%, the holding stage protective atmosphere is 100%H
2
Low, the final high temperature anneal temperature of present embodiment heating-up temperature is low, can omit hot rolled plate normalizing (annealing), and made high magentic induction oriented electrical steel sheet has that chemical composition is simple, magnetic strength is high, iron loss is low, the characteristics of low cost of manufacture.After measured, the result of slab chemical composition and finished product magnetic is as shown in table 3.
Table 3 slab composition and finished product magnetic
Claims (3)
1. the manufacture method of a high magentic induction oriented electrical steel sheet, the chemical composition that it is characterized in that slab is, C is that 0.03～0.050wt%, Si are that 2.9～3.3wt%, Als are that 0.001～0.04wt%, Nb are that 0.01～0.12wt%, N are 0.004～0.012wt%, P for＜0.015wt%, all the other are Fe and unavoidable impurities, inhibitor be AlN and Nb (C, N); Slab is heated to 1200～1320 ℃, is incubated 2～5 hours, carry out hot rolling, the reduction ratio of last 1～3 passage of hot rolling is 10～30%, and finishing temperature is 800～1050 ℃, rolling back relaxation time 1～600 second; Cool off fast and batch, the cooling velocity of cooling is 10～200 ℃/second fast; Being rolling to thickness of slab by the secondary cold-rolling method again is≤0.30mm; In for the first time cold rolling laggard interline annealing, the intermediate annealing temperature is 800～1050 ℃, in the nitrogen and hydrogen mixture atmosphere, carry out, enter in the stove by humidification, dew point is 1～50 ℃, time inside furnace is 5～3000 seconds, and cold rolling reduction ratio is 40～70% for the second time, and the interior thickness of secondary cold-rolling is 0.50～0.90mm; Carry out decarburizing annealing then, the temperature of decarburizing annealing is 800～900 ℃, carries out in the nitrogen and hydrogen mixture atmosphere, enters in the stove by humidification, and dew point is 25～55 ℃, and time inside furnace is 1～60 minute; Be coated with rolling behind the magnesia separation layer; carry out high annealing at last; high annealing is for quickly heating up to 400 ℃; be heated to 600 ℃ with 10～100 ℃/hour firing rate again; be heated to 1100～1200 ℃ with 10～50 ℃/hour firing rate then; be incubated 15～30 hours, cooling at last, the protective atmosphere that is adopted in 400～1200 ℃ heating process is N
225%+H
275%, the holding stage protective atmosphere is 100%H
2
2. the manufacture method of high magentic induction oriented electrical steel sheet according to claim 1 is characterized in that (C N) is one or more mixing precipitate among NbC, NbN, the Nb (CN) to described Nb.
3. according to the high magentic induction oriented electrical steel sheet of the manufacture method manufacturing of each described high magentic induction oriented electrical steel sheet in the claim 1,2.
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| CN101348851B (en) * | 2008-09-05 | 2010-12-01 | 首钢总公司 | Method for producing common oriented electrical steel by low temperature casting blank heating |
| CN105714039B (en) * | 2016-05-04 | 2017-11-21 | 华北理工大学 | The annealing process and its control method of the low-temperature oriented silicon steel containing niobium |
| CN109609734B (en) * | 2019-01-07 | 2020-11-03 | 武汉钢铁有限公司 | Preparation method of cold-rolled non-oriented silicon steel |
| CN109825775B (en) * | 2019-04-04 | 2020-03-27 | 中山市中圣金属板带科技有限公司 | Cold-rolled non-oriented electrical steel 35WD1900 and production method thereof |
| CN112391512B (en) * | 2019-08-13 | 2022-03-18 | 宝山钢铁股份有限公司 | High magnetic induction oriented silicon steel and manufacturing method thereof |
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| JPH1096029A (en) * | 1996-07-30 | 1998-04-14 | Nippon Steel Corp | Manufacture of grain-oriented silicon steel sheet having high magnetic flux density |
| CN1190132A (en) * | 1996-10-11 | 1998-08-12 | 川崎制铁株式会社 | Method for manufacturing high magnetic flux density oriented electric steel plate |
| CN1219977A (en) * | 1996-07-12 | 1999-06-16 | 蒂森钢铁股份公司 | Process for producing grain-orientated magnetic steel sheet |
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2006
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219977A (en) * | 1996-07-12 | 1999-06-16 | 蒂森钢铁股份公司 | Process for producing grain-orientated magnetic steel sheet |
| US6153019A (en) * | 1996-07-12 | 2000-11-28 | Thyssen Stahl Ag | Process for producing a grain-orientated electrical steel sheet |
| JPH1096029A (en) * | 1996-07-30 | 1998-04-14 | Nippon Steel Corp | Manufacture of grain-oriented silicon steel sheet having high magnetic flux density |
| CN1190132A (en) * | 1996-10-11 | 1998-08-12 | 川崎制铁株式会社 | Method for manufacturing high magnetic flux density oriented electric steel plate |
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