CN107746941A - A kind of motor high strength cold-rolled non-orientation silicon steel and manufacture method - Google Patents
A kind of motor high strength cold-rolled non-orientation silicon steel and manufacture method Download PDFInfo
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- CN107746941A CN107746941A CN201711204222.5A CN201711204222A CN107746941A CN 107746941 A CN107746941 A CN 107746941A CN 201711204222 A CN201711204222 A CN 201711204222A CN 107746941 A CN107746941 A CN 107746941A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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Abstract
The present invention provides a kind of motor high strength cold-rolled non-orientation silicon steel and manufacture method, belongs to steel processing technique field.The silicon steel composition is：0.001 0.0015wt.%C, 2.5 3.0wt.%Si, 0.8 1.0wt.%Al, 0.5 0.8wt.%Mn, 1.0 2.0wt.%Cr, N≤0.002wt.%, 0.1 0.2wt.%Nb, remaining is Fe and inevitable impurity, by controlling secondary cold-rolling drafts and annealing process, so that the magnetic induction of non-orientation silicon steel, iron loss and yield strength reach balance.The steel grade that the present invention develops is after above-mentioned cold rolling, annealing process processing, magnetic induction B50For 1.67 1.70T, iron loss W1.0/50For 2.0 5.5W/kg, W1.0/400For 18.8 32.12W/kg, lower yield strength ReLFor 460 510MPa, tensile strength RmFor 560 640MPa, elongation percentage is 16.08% 23.3%, has reached and has surmounted requirement of the rolled products of ordinary high-strength non-orientation silicon steel to aspect of performance.
Description
Technical field
The present invention relates to steel processing technique field, particularly relates to a kind of motor with high strength cold-rolled non-orientation silicon steel
And manufacture method.
Background technology
In recent years, with the fast development of new-energy automobile, to the nothing as motor and micromachine core material
The performance requirement of orientation silicon steel is higher.As efficient motor, it is necessary to meet to rotate at a high speed and obtain high torque, together
When also need to ensure higher magnetic induction intensity and relatively low high frequency iron loss.Therefore, actual production drives with being required in use
More traditional high more than the 200MPa of non-oriented electrical steel intensity of motor, and also to need guarantee to damage its excellent simultaneously improving intensity
Magnetic property.
Up to the present mainly improvement No yield point magnetic strength is reached by optimizing non-orientation silicon steel composition and improving texture
Purpose.In composition design, the non-orientation silicon steel composition used in motor is generally all Ultra-low carbon, (mass fraction is respectively less than nitrogen
50×10-6) and high silicon, also need to add high Al content sometimes, to ensure that its excellent magnetic property is particularly low iron loss, also to have
Reach the purpose of improvement magnetic induction by adding rare earth element.In terms of texture is improved, mainly by be roughened hot-rolled strip crystal grain,
It is appropriate to add the elements such as Sn, Sb, Cu, Mn, suppress using AlN precipitation, thin-belt casting rolling and using the methods of initial column crystal
Harmful texture, increase favorable texture to improve the magnetic induction of non-orientation silicon steel.In order to meet the intensity of non-orientation silicon steel, at present
Mainly achieved the goal by modes such as solid solution strength, precipitation strength and dislocation strengthenings.How by controlling texture to improve magnetic strength
While intensity, improving the mechanical property of non-orientation silicon steel using various schedule of reinforcements makes its combination property reach Best Point, is
One of features of the present invention.
Traditional magnetic silicon steel improves intensity by Si solution strengthening reduces iron loss simultaneously, but can only at most improve to
550MPa or so, more high Si content cause to roll, and are decreased in addition with the raising magnetic induction intensity of Si contents.Cause
This, also has and substitutes Si related work by adding Al.Wherein, Japanese Patent Laid-Open 10-25554 in Si, Al total amount not
On the premise of change, improve the purpose of material magnetic induction intensity by increasing Al and Si contents, but as Al content raises, Si contains
Amount reduces, and material iron loss starts to deteriorate, and the mechanical property of materials also decreases.In addition, as the raising of Al content is to smelting
Sweetening process proposes more strict requirements.
Patent CN102453838A discloses a kind of " the high intensity non-oriented electrical steel and its manufacture method of higher magnetic strength ",
In traditional production technology, make matrix solid solution is substantial amounts of to close by improving composition addition 1%-8%Cr and 0.5%-5%Ni
While gold element is to improve the mechanical property of non-orientation silicon steel, the production cost of high intensity non-orientation silicon steel is also improved；Specially
Sharp CN106435358A discloses a kind of " manufacture method of new-energy automobile motor high intensity non-orientation silicon steel ", passes through
Add 0.5%-3.0%Cr and 0.005%-0.5%Nb and the high intensity non-orientation silicon steel Jing Guo thin-belt casting rolling technique productions
Performance is as follows：Magnetic induction B50For 1.65-1.70T, iron loss P1.0/400For 28-38.2W/kg, yield strength Rp0.2For 600-
780MPa, tensile strength 695-862MPa.Although the mechanical property and magnetic induction of this patent are higher, high frequency iron loss is higher
And thin plate rolling casting technology is difficult in current original industrial production.
Engineering steel using the element such as V, Nb and Ti carries out microalloying and can reached to have both high intensity and low cost
Purpose, but the research of silicon steel in this respect is very limited at present.Chang etc. thinks to add in 0.3%Si non-orientation silicon steels
0.002%-0.011%V, superfine VC and VN can be generated in low temperature thermal oxidation, be grown up so as to suppress recrystallization and crystal grain, but
Iron loss is caused drastically to raise；When annealing temperature rises to 1073K, VC and VN back dissolvings to matrix, cause the abnormal growth of crystal grain, and
{ 111 } //ND texture sharply increases therefore magnetic induction intensity and reduced.Also have by be dissolved appropriate Ti strengthen { 111 } plane texture come
The mechanical property of non-orientation silicon steel is improved, but the magnetic induction intensity for also resulting in non-orientation silicon steel reduces.Due to members such as Ti, Nb, V
Movement of the plain second phase particles to magnetic domain has large effect, when strengthening to non-orientation silicon steel, it is only necessary to which C, N etc. are contained
Amount is strictly controlled, and makes its precipitation strength lower degree infringement iron loss and magnetic induction, and is recrystallized and retained by suppressing
Partial deformation tissue and reach the purpose of reinforcing.It is characteristic of the invention that on the basis of existing production technology, not significantly
On the premise of increasing production cost, reach high-strength by optimizing the composition of non-orientation silicon steel and being suitably modified part of production
Spend the more preferable combination property of non-orientation silicon steel.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of motor high strength cold-rolled non-orientation silicon steel and manufacture
Method, added in 0.001-0.0015wt.%C, 2.5-3.0wt.%Si, 0.8-1.0wt.%Al cold rolling non-orientation silicon steel
Appropriate niobium and chromium, under appropriate hot rolling and technology, promote to have in non-orientation silicon steel using secondary cold-rolling technique
Sharp texture component increase, while the generation of unfavorable texture is reduced, so that non-orientation silicon steel magnetic induction is improved, add in addition
The chromium added increases the resistivity of non-orientation silicon steel so as to reduce iron loss to a certain extent.
The chemical composition of the silicon steel is：0.001-0.0015wt.%C, 2.5-3.0wt.%Si, 0.8-1.0wt.%Al,
0.5-0.8wt.%Mn, 1.0-2.0wt.%Cr, N≤0.002wt.%, 0.1-0.2wt.%Nb, it is remaining for Fe and inevitable
Impurity, by controlling secondary cold-rolling drafts and annealing process so that the magnetic induction of non-orientation silicon steel, iron loss and bend
Take intensity and reach balance.
The motor manufacture method of high strength cold-rolled non-orientation silicon steel, comprises the following steps：
(1) smelt：Raw material is weighed respectively according to chemical composition percentage, is smelted and obtained by converter, electric furnace or induction furnace
Molten steel；
(2) cast：The molten steel that step (1) is obtained uses continuous casting or casting, obtains ingot casting, and obtained ingot casting is entered
Row forging, forging stock thickness is 35-40mm；
(3) hot rolling：The forging stock for obtaining step (2) at 1100-1200 DEG C is incubated 1-2h, is carried out much through milling train after
In five passes, total reduction 92-94%, every time reduction ratio is 28%-35%, finishing temperature control 850 DEG C with
On, hot rolled plate is then incubated to furnace cooling after more than 1h under the conditions of 550 DEG C -650 DEG C；
(4) normalizing：Under purity nitrogen or protective atmosphere, by hot rolled plate made from step (3) in 980 DEG C of -1030 DEG C of conditions
Lower insulation 3-5min, then hot rolled plate is taken out and is air-cooled to room temperature, obtains normalizing plate；
(5) once cold rolling and annealing：Normalizing plate made from step (4) is subjected to pickling processes, then carries out once cold rolling
To 0.5mm, then in 25%H2+ 75%N22-5min is incubated under the conditions of atmosphere and 800 DEG C -900 DEG C, by obtain annealed sheet
Taking-up is air-cooled to room temperature；
(6) secondary cold-rolling and annealing：An annealed sheet made from step (5) is subjected to second of cold rolling, drafts control
In 15%-40%, then in 25%H2+ 75%N23-5min is incubated under the conditions of atmosphere and 940 DEG C -1020 DEG C, it is secondary by what is obtained
Annealed sheet takes out and is air-cooled to room temperature；
The magnetic induction B of obtained silicon steel50For 1.67-1.70T, iron loss W1.0/50For 2.0-5.5W/kg, W1.0/400For
18.8-32.12W/kg, lower yield strength ReLFor 460-510MPa, tensile strength RmFor 560-640MPa, elongation percentage is
16.08%-23.3%.Its preferable combination property be attributed to the niobium atom of solid solution in non-orientation silicon steel annealing process again
Crystallization has strong inhibitory action, so as to member-retaining portion deformed microstructure.Therefore, the movement of second phase particles pinning domain wall is avoided
Cause the deterioration of iron loss and magnetic induction.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
Because the present invention is to utilize dislocation strengthening, therefore annealing is needed using technique between high temperature, short time so as to reach dislocation weight
The special microstructure of row, the purpose strengthened both is reached or has not deteriorated iron loss and magnetic induction.In addition changed by secondary cold-rolling
Kind non-orientation silicon steel texture, therefore the production of current existing cold rolling non-orientation silicon steel is different from above.Simple production process, can
It is widely used in the cold rolling non-orientation silicon steel manufacturer of the different levels of production, technique versatility is stronger.
Brief description of the drawings
Fig. 1 is sample ODF figures after secondary cold-rolling of the present invention；
Fig. 2 is 980 DEG C of annealing specimen metallographs of the invention；
Fig. 3 is 940 DEG C of annealing specimen niobium distribution diagram of element of the invention；
Fig. 4 is 940 DEG C of annealing specimen SEM figures of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
The present invention provides a kind of motor high strength cold-rolled non-orientation silicon steel and manufacture method.
Embodiment 1
Chemical composition (being calculated in mass percent) is：0.0012wt.%C, 2.8wt.%Si, 0.8wt.%Al,
0.56wt.%Mn, 1.8wt.%Cr, 0.0020wt.%N, 0.2wt.%Nb, remaining is iron and inevitable impurity.
Forging stock carries out 7 passes, total reduction 94%, every time pressure after 1200 DEG C are incubated 2h, by milling train
Lower rate is 30%, and finishing temperature is 880 DEG C, and hot rolled plate is then incubated to furnace cooling after 1h under the conditions of 650 DEG C.Then by heat
Plate is rolled in 980 DEG C and dry 100%N2It is incubated after 5min and takes out under protective atmosphere and is air-cooled to room temperature.Normalizing plate is gone through pickling
After iron scale, 0.5mm is cold-rolled to, then by cold-reduced sheet in 850 DEG C and dry 25%H2+ 75%N2Protected under protective atmosphere
Warm 3min, then take out and be air-cooled to room temperature.It is cold-rolled to 0.20mm for the second time again to annealed sheet, it is then at 940 DEG C and dry
25%H2+ 75%N2After being incubated 5min under protective atmosphere, annealed sheet is taken out be air-cooled to room temperature immediately.The magnetic of products obtained therefrom
Performance B50=1.69T, iron loss W1.0/400=28.94W/kg, W1.0/50=4.684W/kg, mechanical property are：ReL=505MPa, Rm
=640MPa, elongation percentage 17.55%.
Wherein, secondary cold-rolling sample ODF figures are as shown in figure 1, sample metallograph is as shown in Fig. 2 940 DEG C after 980 DEG C of annealing
Annealing specimen niobium Elemental redistribution is as shown in figure 3,940 DEG C of annealing specimen SEM figures are as shown in Figure 4.
Embodiment 2
Chemical composition (being calculated in mass percent) is：0.0015wt.%C, 2.9wt.%Si, 0.91wt.%Al,
0.64wt.%Mn, 1.5wt.%Cr, 0.0018wt.%N, 0.17wt.%Nb, remaining is iron and inevitable impurity.
Forging stock carries out 7 passes, total reduction 94%, every time pressure after 1150 DEG C of heating, by milling train
Rate is 31%, and finishing temperature is 870 DEG C, and hot rolled plate is then incubated to furnace cooling after 1h under the conditions of 600 DEG C.Then by hot rolling
Plate is in 1030 DEG C and dry 100%N2Air cooling is taken out after being incubated 3min under protective atmosphere.Normalizing plate removes iron oxide through pickling
Pi Hou, 0.5mm is cold-rolled to, then by cold-reduced sheet in 800 DEG C and dry 25%H2+ 75%N25min is incubated under protective atmosphere, with
Take out afterwards and be air-cooled to room temperature.Then secondary cold-rolling is carried out again to annealed sheet to 0.20mm, then in 980 DEG C and dry 25%H2+
75%N2After being incubated 3min under protective atmosphere, annealed sheet is taken out be air-cooled to room temperature immediately.The magnetic property B of products obtained therefrom50=
1.673T iron loss W1.0/400=30.77W/kg, W1.0/50=5.02W/kg, mechanical property are：ReL=500MPa, Rm=
625MPa, elongation percentage 17.09%.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
- A kind of 1. high strength cold-rolled non-orientation silicon steel of motor, it is characterised in that：Chemical composition is：0.001- 0.0015wt.%C, 2.5-3.0wt.%Si, 0.8-1.0wt.%Al, 0.5-0.8wt.%Mn, 1.0-2.0wt.%Cr, N≤ 0.002wt.%, 0.1-0.2wt.%Nb, remaining is Fe.
- 2. the motor according to claim 1 manufacture method of high strength cold-rolled non-orientation silicon steel, it is characterised in that： Comprise the following steps：(1) smelt：Raw material is weighed respectively according to chemical composition percentage, is smelted by converter, electric furnace or induction furnace and is obtained molten steel；(2) cast：The molten steel that step (1) is obtained uses continuous casting or casting, obtains ingot casting, and obtained ingot casting is forged Make, forging stock thickness is 35-40mm；(3) hot rolling：The forging stock for obtaining step (2) at 1100-1200 DEG C is incubated 1-2h, is carried out after through milling train no less than five Passes, total reduction 92-94%, every time reduction ratio are 28%-35%, finishing temperature control more than 850 DEG C, with Hot rolled plate is incubated to the rear furnace coolings of more than 1h under the conditions of 550 DEG C -650 DEG C afterwards；(4) normalizing：Under purity nitrogen or protective atmosphere, hot rolled plate made from step (3) is protected under the conditions of 980 DEG C -1030 DEG C Warm 3-5min, then hot rolled plate is taken out and is air-cooled to room temperature, obtains normalizing plate；(5) once cold rolling and annealing：Normalizing plate made from step (4) is subjected to pickling processes, then carries out once cold rolling extremely 0.5mm, then in 25%H2+ 75%N22-5min is incubated under the conditions of atmosphere and 800 DEG C -900 DEG C, obtain annealed sheet is taken Go out to be air-cooled to room temperature；(6) secondary cold-rolling and annealing：An annealed sheet made from step (5) is subjected to second of cold rolling, drafts control exists 30%-60%, then in 25%H2+ 75%N23-5min is incubated under the conditions of atmosphere and 940 DEG C -1020 DEG C, secondary is moved back what is obtained Fiery plate takes out and is air-cooled to room temperature.
- 3. the high strength cold-rolled non-orientation silicon steel of motor according to claim 1, it is characterised in that：The silicon steel Magnetic induction B50For 1.67-1.70T, iron loss W1.0/50For 2.0-5.5W/kg, W1.0/400It is strong for 18.8-32.12W/kg, lower surrender Spend ReLFor 460-510MPa, tensile strength RmFor 560-640MPa, elongation percentage 16.08%-23.3%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108411205A (en) * | 2018-04-09 | 2018-08-17 | 内蒙古工业大学 | The method that CSP flows produce high-magnetic induction, low-iron loss non-oriented electrical steel |
| CN112226608A (en) * | 2020-09-07 | 2021-01-15 | 江阴市南闸中天电器有限公司 | Heat treatment process for silicon steel sheet |
| 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 |
| CN114058963A (en) * | 2021-11-26 | 2022-02-18 | 东北大学 | Method for preparing high-strength non-oriented silicon steel based on nano precipitation strengthening |
| CN114107799A (en) * | 2021-09-15 | 2022-03-01 | 鞍钢股份有限公司 | High-strength silicon steel thin strip plate with excellent high-frequency electromagnetic performance and production process |
| CN114606435A (en) * | 2022-02-09 | 2022-06-10 | 山西太钢不锈钢股份有限公司 | High-efficiency high-strength non-oriented silicon steel thin strip for automobile driving motor |
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| CN106435358A (en) * | 2016-10-11 | 2017-02-22 | 东北大学 | Manufacturing method of high-strength non-oriented silicon steel for new energy vehicle driving motor |
| CN107130169A (en) * | 2017-04-20 | 2017-09-05 | 北京科技大学 | A kind of high intensity cupric cold rolling non-orientation silicon steel and manufacture method |
| CN107385335A (en) * | 2017-08-08 | 2017-11-24 | 马钢(集团)控股有限公司 | A kind of new-energy automobile motor non-orientation silicon steel thin belt and manufacture method |
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| CN102925816A (en) * | 2012-11-21 | 2013-02-13 | 武汉钢铁(集团)公司 | Non-oriented silicon steel for electric drive motor and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108411205A (en) * | 2018-04-09 | 2018-08-17 | 内蒙古工业大学 | The method that CSP flows produce high-magnetic induction, low-iron loss non-oriented electrical steel |
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| CN112226608A (en) * | 2020-09-07 | 2021-01-15 | 江阴市南闸中天电器有限公司 | Heat treatment process for silicon steel sheet |
| 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 |
| CN114107799A (en) * | 2021-09-15 | 2022-03-01 | 鞍钢股份有限公司 | High-strength silicon steel thin strip plate with excellent high-frequency electromagnetic performance and production process |
| CN114058963A (en) * | 2021-11-26 | 2022-02-18 | 东北大学 | Method for preparing high-strength non-oriented silicon steel based on nano precipitation strengthening |
| CN114606435A (en) * | 2022-02-09 | 2022-06-10 | 山西太钢不锈钢股份有限公司 | High-efficiency high-strength non-oriented silicon steel thin strip for automobile driving motor |
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| CN107746941B (en) | 2019-03-26 |
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