CN103952629B - Silicon cold rolling non-orientation silicon steel and manufacture method in one - Google Patents

Silicon cold rolling non-orientation silicon steel and manufacture method in one Download PDF

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CN103952629B
CN103952629B CN201410200432.7A CN201410200432A CN103952629B CN 103952629 B CN103952629 B CN 103952629B CN 201410200432 A CN201410200432 A CN 201410200432A CN 103952629 B CN103952629 B CN 103952629B
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cold rolling
temperature
silicon steel
annealing
forging stock
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CN103952629A (en
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曾燕屏
吴萌
姚大志
杜毫杰
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The invention belongs to ferrous metallurgy and processing technique field, particularly silicon cold rolling non-orientation silicon steel and manufacture method in one.Its chemical composition is: Si:1.5 ~ 1.7%, Al:0.2 ~ 0.3%, Mn:0.3 ~ 0.6%, Cu:0.1 ~ 0.3%, C≤0.003%, P≤0.007%, S≤0.003%, N≤0.005%, and all the other are iron and inevitable impurity.Manufacturing condition is: forging stock thickness is 18 ~ 20mm; Forging stock Heating temperature is 1100 ~ 1150 DEG C, and rolling pass is 5 passages, and total reduction is 83 ~ 86%, and every time draft is 25 ~ 35%, and ensure that finishing temperature is more than 950 DEG C, coiling temperature is 550 ~ 560 DEG C; Normalizing annealing temperature is 920 ~ 930 DEG C, and annealing time is 20 ~ 30 minutes.Production technique of the present invention is simple, and not high to equipment requirements, can be widely used in the cold rolling non-orientation silicon steel manufacturer of different equipment, technique versatility is stronger.

Description

Silicon cold rolling non-orientation silicon steel and manufacture method in one
Technical field
The invention belongs to ferrous metallurgy and processing technique field, particularly silicon cold rolling non-orientation silicon steel and manufacture method in one.
Background technology
Silicon steel is mainly used as iron core and other electrical component of various motor, generator and transformer, it is indispensable important non-retentive alloy in electric power, electronics and war industry, its the key technical indexes is iron loss and magnetic strength, reduces iron loss, and improving magnetic strength is that the target pursued produced by silicon steel.Can not only reduce the iron loss of silicon steel owing to improving texture, and its magnetic strength can also be improved, therefore people are put into attention the research how improving non orientating silicon steel texture gradually and have come up in recent years.Kubo Tian Meng (Kubo Tian Meng, Japanese Patent Publication, clear 62-1800142 (1987)) research discovery, 0.31 ~ 0.39%Cu is added add 0.06 ~ 0.1%Sn in 0.4 ~ 0.5%Si steel while, greatly can improve the texture of steel, thus the magnetic property of steel is improved, but its reason unclear.The people such as G.Lyudkovsky (G.Lyudkovsky, J.M.Shapiro.Effectofaluminumcontentandprocessingontextur eandpermeabilityoflaminationsteels.JournalofAppliedPhysi cs, 1985, 57 (8): 4235.) have studied the impact that AlN is formed non-oriented electrical steel recrystallization texture, found that electrical steel composition, slab heating temperature, the processing parameters such as coiling temperature are all by realizing the impact of the finished product magnetic property on the impact of the AlN amount separated out in hot-rolled strip, the AlN separated out in hot-rolled strip is more, the AlN separated out in cold rolling rear recrystallization annealing process is fewer, in steel, { 111} reduces unfavorable texture component thereupon, the magnetic property of the finished product is better.
Summary of the invention
The object of this invention is to provide silicon cold rolling non-orientation silicon steel and manufacture method in one.It is characterized in that: in the cold rolling non-orientation silicon steel of (Si+Al)=1.7 ~ 1.9% (mass percent), add appropriate copper; in suitable hot rolling, batch with under normalizing annealing processing condition; utilize a large amount of cupric second-phases of separating out in hot-rolled strip to promote the favorable texture component { formation of 110} in steel; reduce { the formation of 111}, thus the magnetic property of steel is improved greatly of unfavorable texture component.With the cold rolling non-orientation silicon steel that present method manufactures, its magnetic induction density B 50> 1.7T, iron loss P 1.5< 3.2W/kg.(application number is respectively 200910083999.X and 201010216966.0 to two patents of previously having applied for the first contriver, wherein previous apply for a patent authorized, the patent No. is ZL200910083999.X) to compare, in this invention, the Si content of silicon steel significantly increases with (Si+Al) content (mass percent).The Si content that the first two applies for a patent middle silicon steel is respectively 1.08 ~ 1.28% and 0.9 ~ 1.25%, and (Si+Al) content is respectively 1.1 ~ 1.3% and 1.05 ~ 1.4%, belongs to low-silicon steel; And the Si content of silicon steel is 1.5 ~ 1.7% in the present invention, (Si+Al) content is 1.7 ~ 1.9%, silicon steel in genus.In addition, invention also reduces the carbon content in silicon steel, C≤0.005% (mass percent) in being applied for a patent by the first two has been reduced to C≤0.003% in the present invention.Compared with silicon steel in applying for a patent with the first two, the present invention is by carrying high Si content thus improving (Si+Al) content, reduce carbon content, and strict control its manufacturing process, can obtain the lower silicon steel of iron loss (the first two magnetic property of applying for a patent middle silicon steel is respectively: magnetic induction density B when not reducing magnetic strength 50> 1.7T, iron loss P 1.5< 4.0W/kg and B 50> 1.7T, P 1.5< 3.5W/kg; And the magnetic property of silicon steel is in the present invention: B 50> 1.7T, P 1.5< 3.2W/kg).
Technical scheme of the present invention is:
Silicon cold rolling non-orientation silicon steel in one, its chemical composition is by mass percentage: Si:1.5 ~ 1.7%, Al:0.2 ~ 0.3%, Mn:0.3 ~ 0.6%, Cu:0.1 ~ 0.3%, C≤0.003%, P≤0.007%, S≤0.003%, N≤0.005%, all the other are iron and inevitable impurity.
Silicified breccias all can improve the resistivity of iron, reduces its iron loss.But higher sial content can make the magnetic strength of silicon steel reduce, therefore in the present invention, (Si+Al) content of silicon steel is designed to 1.7 ~ 1.9%, to make it both have lower iron loss, has again higher magnetic strength.Mn can promote favorable texture component in cold rolling non-orientation silicon steel { formation of 110}, therefore the manganese adding 0.3 ~ 0.6% in silicon steel of the present invention.In order to make to separate out a large amount of cupric second-phase in hot-rolled strip, in silicon steel of the present invention, add the copper of 0.1 ~ 0.3%.In addition, reduce the content of carbon, sulphur, phosphorus, nitrogen in steel, to improve the magnetic property of silicon steel as far as possible.Silicon steel in the present invention requires its C≤0.003%, P≤0.007%, S≤0.003%, N≤0.005%.
In this, the manufacture method of silicon cold rolling non-orientation silicon steel comprises the steps:
(1) smelt and forging
Vacuum induction furnace smelting also forges, obtain the forging stock that chemical composition is by mass percentage following: Si:1.5 ~ 1.7%, Al:0.2 ~ 0.3%, Mn:0.3 ~ 0.6%, Cu:0.1 ~ 0.3%, C≤0.003%, P≤0.007%, S≤0.003%, N≤0.005%, all the other are iron and inevitable impurity.Forging stock thickness is 18 ~ 20mm.
(2) hot rolling with batch
Forging stock Heating temperature is 1100 ~ 1150 DEG C, and rolling pass is 5 passages, and total reduction is 83 ~ 86%, and every time draft is 25 ~ 35%, and ensure that finishing temperature is more than 950 DEG C, coiling temperature is 550 ~ 560 DEG C.
(3) normalizing annealing and pickling
Normalizing annealing temperature is 920 ~ 930 DEG C, and annealing time is 20 ~ 30 minutes, uses the heating mode that temperature enters stove, and after annealing, air cooling is to room temperature.Normalizing annealing plate, after pickling descaling, enters cold rolling process.
(4) cold rolling with annealing
Adopt once cold rolling method that the hot-rolled sheet after pickling is rolled finished product thickness, be generally 0.5mm, then at dry 25%H 2+ 75%N 2finished products is carried out in (dew point is lower than 0 DEG C) protective atmosphere.
The present invention compared with prior art has following beneficial effect:
1. adopt manufacture method of the present invention can obtain middle silicon cold rolling non-orientation silicon steel, its magnetic induction density B 50> 1.7T, iron loss P 1.5< 3.2W/kg.
2. because the present invention utilizes a large amount of cupric second-phases of separating out in hot-rolled strip to improve cold rolling non-orientation silicon steel texture, therefore be different from the production principle of current existing cold rolling non-orientation silicon steel.Production technique is simple, and not high to equipment requirements, can be widely used in the cold rolling non-orientation silicon steel manufacturer of different equipment, technique versatility is stronger.
Accompanying drawing explanation
Cupric second-phase in Fig. 1 hot-rolled strip
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment 1
Chemical composition (being calculated in mass percent) is: C:0.0029%, Si+Al=1.68%+0.20%, Mn:0.46%, Cu:0.17%, P:0.0053%, S:0.0025%, N:0.0031%, all the other are the forging stock of iron and inevitable impurity, after 1150 DEG C of soaking, carry out 5 passage hot rollings, total reduction is 85.5%, every time draft is 25 ~ 35%, namely by 20.0mm → 14.0mm → 9.1mm → 6.0mm → 3.9mm → 2.9mm.Finishing temperature is 960 DEG C, and coiling temperature is 560 DEG C.Hot-rolled sheet after 920 DEG C of normalizing annealing 30min air cooling to room temperature, and then pickling descaling.By once cold rolling method, normalizing annealing plate is cold rolled to finished product thickness 0.5mm, then at dry 25%H 2+ 75%N 2finished products is carried out in (dew point is lower than 0 DEG C) protective atmosphere.The magnetic property of gained finished product is: B 50=1.74T, P 1.5=3.17W/kg.
Embodiment 2
Chemical composition (being calculated in mass percent) is: C:0.0024%, Si+Al=1.52%+0.21%, Mn:0.58%, Cu:0.29%, P:0.0065%, S:0.0017%, N:0.0048%, all the other are the forging stock of iron and inevitable impurity, after 1100 DEG C of soaking, carry out 5 passage hot rollings, total reduction is 83.3%, every time draft is 25 ~ 35%, namely by 18.0mm → 13.5mm → 8.8mm → 5.8mm → 4.0mm → 3.0mm.Finishing temperature is 970 DEG C, and coiling temperature is 550 DEG C.Hot-rolled sheet after 930 DEG C of normalizing annealing 20min air cooling to room temperature, and then pickling descaling.By once cold rolling method, normalizing annealing plate is cold rolled to finished product thickness 0.5mm, then at dry 25%H 2+ 75%N 2finished products is carried out in (dew point is lower than 0 DEG C) protective atmosphere.The magnetic property of gained finished product is: B 50=1.71T, P 1.5=2.88W/kg.
Embodiment 3
Chemical composition (being calculated in mass percent) is: C:0.0025%, Si+Al=1.59%+0.28%, Mn:0.32%, Cu:0.12%, P:0.0047%, S:0.0021%, N:0.0038%, all the other are the forging stock of iron and inevitable impurity, after 1100 DEG C of soaking, carry out 5 passage hot rollings, total reduction is 84.7%, every time draft is 25 ~ 35%, namely by 19mm → 14.0mm → 9.1mm → 6.0mm → 3.9mm → 2.9mm.Finishing temperature is 960 DEG C, and coiling temperature is 550 DEG C.Hot-rolled sheet after 930 DEG C of normalizing annealing 20min air cooling to room temperature, and then pickling descaling.By once cold rolling method, normalizing annealing plate is cold rolled to finished product thickness 0.5mm, then at dry 25%H 2+ 75%N 2finished products is carried out in (dew point is lower than 0 DEG C) protective atmosphere.The magnetic property of gained finished product is: B 50=1.72T, P 1.5=2.96W/kg.

Claims (1)

1. the manufacture method of silicon cold rolling non-orientation silicon steel in a kind, it is characterized in that chemical composition is by mass percentage: Si:1.5 ~ 1.7%, Al:0.2 ~ 0.3%, Mn:0.3 ~ 0.6%, Cu:0.1 ~ 0.3%, C≤0.003%, P≤0.007%, S≤0.003%, N≤0.005%, all the other are iron and inevitable impurity;
Concrete preparation process is as follows:
(1) smelt and forging:
Vacuum induction furnace smelting also forges, obtain the forging stock that chemical composition is by mass percentage following: Si:1.5 ~ 1.7%, Al:0.2 ~ 0.3%, Mn:0.3 ~ 0.6%, Cu:0.1 ~ 0.3%, C≤0.003%, P≤0.007%, S≤0.003%, N≤0.005%, all the other are iron and inevitable impurity, and forging stock thickness is 18 ~ 20mm;
(2) hot rolling with batch:
Forging stock Heating temperature is 1100 ~ 1150 DEG C, and rolling pass is 5 passages, and total reduction is 83 ~ 86%, and every time draft is 25 ~ 35%, and ensure that finishing temperature is more than 950 DEG C, coiling temperature is 550 ~ 560 DEG C;
(3) normalizing annealing and pickling:
Normalizing annealing temperature is 920 ~ 930 DEG C, and annealing time is 20 ~ 30 minutes, uses the heating mode that temperature enters stove, and after annealing, air cooling is to room temperature; Normalizing annealing plate, after pickling descaling, enters cold rolling process;
(4) cold rolling with annealing:
Adopt once cold rolling method that the hot-rolled sheet after pickling is rolled finished product thickness, then at dry 25%H 2+ 75%N 2finished products is carried out, 25%H in protective atmosphere 2+ 75%N 2protective atmosphere dew point is lower than 0 DEG C.
CN201410200432.7A 2014-05-13 2014-05-13 Silicon cold rolling non-orientation silicon steel and manufacture method in one Expired - Fee Related CN103952629B (en)

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Publication number Priority date Publication date Assignee Title
CN108286014B (en) * 2018-01-16 2020-02-14 北京科技大学 Preparation method of low-iron-loss high-strength non-oriented electrical steel
CN110241362B (en) * 2019-07-09 2021-05-28 鞍钢股份有限公司 Non-oriented silicon steel for driving motor and production method thereof
CN112322972A (en) * 2020-10-17 2021-02-05 北京科技大学 Method for improving comprehensive performance of high-strength non-oriented high-silicon steel through normalizing treatment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0413306B1 (en) * 1989-08-18 1996-04-10 Nippon Steel Corporation Method of producing non-oriented magnetic steel plate having high magnetic flux density
JP2007031754A (en) * 2005-07-25 2007-02-08 Sumitomo Metal Ind Ltd Method for manufacturing non-oriented electromagnetic steel sheet to be aged
JP2009084646A (en) * 2007-09-28 2009-04-23 Kobe Steel Ltd Soft magnetic steel member, soft magnetic steel component, and method for producing the same
CN101528385A (en) * 2006-10-23 2009-09-09 新日本制铁株式会社 Method for manufacturing non-oriented electrical sheet having excellent magnetic properties
CN101921956A (en) * 2010-06-23 2010-12-22 北京科技大学 High-magnetic induction, low-iron loss, low-carbon, low-silicon and non-oriented electrical steel and manufacturing method thereof
EP2390373A1 (en) * 2008-12-31 2011-11-30 Baoshan Iron & Steel Co., Ltd. Method for manufacturing grain oriented silicon steel with single cold rolling

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0413306B1 (en) * 1989-08-18 1996-04-10 Nippon Steel Corporation Method of producing non-oriented magnetic steel plate having high magnetic flux density
JP2007031754A (en) * 2005-07-25 2007-02-08 Sumitomo Metal Ind Ltd Method for manufacturing non-oriented electromagnetic steel sheet to be aged
CN101528385A (en) * 2006-10-23 2009-09-09 新日本制铁株式会社 Method for manufacturing non-oriented electrical sheet having excellent magnetic properties
JP2009084646A (en) * 2007-09-28 2009-04-23 Kobe Steel Ltd Soft magnetic steel member, soft magnetic steel component, and method for producing the same
EP2390373A1 (en) * 2008-12-31 2011-11-30 Baoshan Iron & Steel Co., Ltd. Method for manufacturing grain oriented silicon steel with single cold rolling
CN101921956A (en) * 2010-06-23 2010-12-22 北京科技大学 High-magnetic induction, low-iron loss, low-carbon, low-silicon and non-oriented electrical steel and manufacturing method thereof

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