CN104046760A - Production method of electrical steel plate - Google Patents
Production method of electrical steel plate Download PDFInfo
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- CN104046760A CN104046760A CN201410276239.1A CN201410276239A CN104046760A CN 104046760 A CN104046760 A CN 104046760A CN 201410276239 A CN201410276239 A CN 201410276239A CN 104046760 A CN104046760 A CN 104046760A
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Abstract
The invention relates to a production method of an electrical steel plate. The production method comprises the following steps of (1), converter-smelting of molten steel; (2), RH refining; (3), thin plate blank continuous casting and continuous rolling; (4), normalizing and pickling; (5), single rack cold-rolling; and (6), continuous annealing. Furthermore, the production method comprises the followings steps of: (7), coating; and (8), finishing. A cold-rolled non-orientated steel belt produced by the method disclosed by the invention is excellent in magnetic performance, low in production cost, and can satisfy needs of downstream motor uses. Moreover, the invention firstly discloses a manufacturing process for non-orientated electrical steel plate without a phase-change chemical component at home, which is produced by thin plate blank continuous casting and continuous rolling, so that the advantages of producing non-orientated electrical steel with lower iron loss and high magnetic conductivity by thin plate blank continuous casting and continuous rolling are brought into full play, and therefore, technical support is provided for producing a high-level plate belt product on a thin plate blank continuous casting and continuous rolling line. And meanwhile, a production range for thin plate blank continuous casting and continuous rolling process products is further expanded.
Description
Technical field
The present invention relates to a kind of production method of electrical sheet, be specifically related to a kind ofly for making high efficiency motor iron core material, adopt CSP to produce the making method that possesses low iron loss, high magnetic permeability electrical steel steel plate.
Background technology
Non-oriented electromagnetic steel sheet is used as iron core material for generator for rotating machinery and medium and small transformer.Along with forcing in recent years to carry out energy-efficient and earth movement of environmental protection both at home and abroad, the tendency of high performance or perhaps high efficiency is very obvious.For this reason, also more and more stronger for the demand of the non-oriented electromagnetic steel sheet of low iron loss, high magnetic permeability.
Usually used as the means that reduce non-oriented electromagnetic steel sheet iron loss, generally by increasing resistance, reduce eddy losses and set out, take to improve that the content of Si or Al realizes.But on the other hand, the reduction of magnetic permeability has also become unavoidable problem.In addition, by improving the purity of steel, not merely the content that improves Si or Al, reduce in addition the content of C, S, N, O, or with in patent clear 54-163720 by add B etc. chemical treatment, improve cold rolling draft before finished products, improve finished products temperature etc., these are all also in order to reduce iron loss in production technique upper and lower time.But, for magnetic permeability, just there is no similar effect.Therefore also just can not get the non-oriented electromagnetic steel sheet that high magnetic permeability and iron loss are low.
By experience and the fact in the past, solve these conflicting performance index of low iron loss and high magnetic permeability, only by improving the purity of molten steel, the content that improves Si or Al is realized this goal is infeasible.This aspect, by the content of purity, raising Si or the Al of molten steel, is added micro-alloying element and hot rolling reeling temperature simultaneously and is reached the object that improves magnetic permeability and reduce iron loss.
From utilizing with effective the trace element adding by improving the purity of composition steel, then combine with production technique, make in production board, magnetic favourable (100) or (110) texture are able to prosperity.And suppress magnetic disadvantageous (111) texture, whether can obtain magneticflux-density the viewpoint high and non-oriented electromagnetic steel sheet that iron loss is low sets out, by reducing the content of S, improve the purity of the composition of steel, and add micro-Sn, control the coiling temperature of hot rolling, can when improving magneticflux-density, can also reduce iron loss.
Summary of the invention
The object of the present invention is to provide a kind of production method of electrical sheet, solve these conflicting performance index of low iron loss and high magnetic permeability, in the content of the purity by raising molten steel, raising Si or Al, add micro-alloying element and hot rolling reeling temperature and reach the object that improves magnetic permeability and reduce iron loss.Concrete technical scheme is as follows:
A production method for electrical sheet, comprises the steps:
(1) molten steel converter smelting;
(2) RH refining;
(3) CSP;
(4) normalizing pickling;
(5) single stand cold mill;
(6) continuous annealing.
Further, also comprise the steps:
(7) coating;
(8) finishing.
Further, in step (3), the finishing temperature of hot rolling is at 840～900 ℃, and coiling temperature is not less than 700 ℃.
Further, in step (1)-(3), molten steel continuous casting after smelting, refining becomes the thin slab of thickness 60～90mm, and thin slab heats without the cooling process furnace that directly enters.
Further, in step (3), the temperature of process furnace is at 1050～1160 ℃, and be 0.5～3.5h heat-up time; Through hot rolling, make again the hot-rolled sheet of 2.0～2.5mm thickness.
Further, the chemical component weight per-cent of described thin slab: 1.50%≤Si≤2.50%, 0.30%≤Al≤1.00%, 0.10%≤Mn≤2.00%, 0.010%≤Sn≤0.100%, and, the total amount of Si and Al is Si+2Al >=2.00%, C≤0.0030%, N≤0.0020%, S≤0.0030%, Ti≤0.0030%, Nb≤0.0030%, V≤0.0050%, As≤0.0030%, residuals is that Fe and inevitable inclusion form.
Further, in step (4), normalizing thermal treatment temp is at 900～1100 ℃, and soaking time is at 1～5min.
Further, in step (4), the steel plate after normalizing thermal treatment, through ball blast pickling, pickling temperature is controlled at 70～90 ℃.
Further, in step (5), cold rolling employing 5 passage rollings on single chassis reversable mill after pickling, cold rolling total reduction is 75～80%.
Further, in step (6), annealing is carried out in continuous annealing furnace, and annealing temperature is 800～950 ℃, and soaking time is 1～4min, and in stove, dew point is controlled at 10～35 ℃;
And/or,
In step (5)-(6), single chassis tandem rolling is rolled to 0.5mm thickness, finally by continuous annealing, coating and make the electrical steel strip finished product of 0.5mm thickness.
Compare with currently available technology, the cold rolling non-orientation steel band that the present invention adopts aforesaid method to make, its magnetic property is excellent, and production cost is low, can meet downstream motor user's demand.And a kind of CSP production has been proposed at home first without the manufacturing process of the non-oriented electromagnetic steel sheet of phase transformation chemical composition, give full play to CSP and produce the advantage of lower iron loss, high magnetic permeability non-oriented electrical steel, for CSP line, produce high-grade strip product technical guarantee is provided, also further expanded continuous casting and rolling technique of sheet bar product simultaneously and manufactured scope.The method is by adding trace alloying element Sn, in conjunction with production technique, controls coiling temperature well, obtains favourable (100) or (110) texture of magnetic, and magnetic permeability u1.0 improves 500～1000Gs/Oe, iron loss Quality level of actual product raising 5-10%.
Embodiment
Describe the present invention below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
Thin slab is produced low iron loss, high-magnetic strength non-oriented electrical steel and a manufacture method thereof, and 1, the technological process of production of low-carbon low-silicon cold rolled non-oriented electrical steel is: molten steel converter smelting → RH refining → CSP → normalizing pickling → single stand cold mill → continuous annealing → coating → finishing.2, in above-mentioned 1, through smelting, after refining, continuous casting becomes the thin slab of thickness 60～90mm to molten steel, and thin slab is without cooling and directly enter process furnace heating, and the temperature of process furnace is at 1050～1160 ℃, and be 0.5～3.5h heat-up time; Through hot rolling, make again the hot-rolled sheet of 2.0～2.5mm thickness; Hot-rolled sheet is after normalizing thermal treatment pickling, and single chassis tandem rolling is rolled to 0.5mm thickness, finally by continuous annealing, coating and make the electrical steel strip finished product of 0.5mm thickness.3, in above-mentioned 1, the chemical component weight per-cent of thin slab: 1.50%≤Si≤2.50%, 0.30%≤Al≤1.00%, 0.10%≤Mn≤2.00%, 0.010%≤Sn≤0.100% and, the total amount of Si and Al is Si+2Al >=2.00%, C≤0.0030%, N≤0.0020%, S≤0.0030%, Ti≤0.0030%, Nb≤0.0030%, V≤0.0050%, As≤0.0030%, residuals is that Fe and inevitable inclusion form.4, in above-mentioned 1, the finishing temperature of hot rolling is at 840～900 ℃, and coiling temperature must be not less than 700 ℃; 5, in above-mentioned manufacture method, there is normalizing thermal treatment temp at 900～1100 ℃, soaking time is at 1～5min.6, in above-mentioned 1, the steel plate after normalizing thermal treatment, through ball blast pickling, pickling temperature is controlled at 70～90 ℃; Cold rolling employing 5 passage rollings on single chassis reversable mill after pickling, cold rolling total reduction is 75～80%; 7, in above-mentioned 1, annealing is carried out in continuous annealing furnace, and annealing temperature is 800～950 ℃, and soaking time is 1～4min, and in stove, dew point is controlled at 10～35 ℃; 8, in above-mentioned 1, the iron loss P of electrical steel strip finished product
1.5/50≤ 3.2W/Kg, magnetic permeability u
1.0>=6500Gs/Oe, magnetic strength B
50>=1.72T.
The non-oriented electrical steel composition without phase transformation chemical composition in the present invention and the magnetic property under corresponding technique are in Table 1.The working condition of embodiment is 120 tons of converter smeltings; through ladle argon-blown, RH vacuum-treat; enter sheet blank continuous casting; after continuous tunnel furnace soaking; enter 7 frame tandem mill group rollings; hot-rolled sheet carries out normalizing pickling after being rolling to 2.2mm thickness, and normalizing thermal treatment process speed is 25m/min, and normalizing soaking zone temperature is 960 ℃.Steel plate after normalizing pickling, by single chassis reversable mill rolling 0.50mm thickness, is sent into follow-up continuous annealing+painting insulation layer production line, produces middle high grade non-oriented electrical steel finished steel coils.Clip epstein frame sample from finished product volume, carries out magnetic property detection, the results are shown in Table shown in 2.
Table 1 is without the electrical steel composition of phase transformation composition, %
| Sequence number | C | Si | Mn | P | S | Ti | N | Sn | CT/℃ | Remarks |
| 1 | 0.0020 | 1.85 | 0.25 | 0.013 | 0.0015 | 0.0020 | 0.0020 | 0.054 | 720 | Example 1 |
| 2 | 0.0030 | 1.82 | 0.25 | 0.018 | 0.0016 | 0.0021 | 0.0020 | 0.051 | 725 | Example 2 |
| 3 | 0.0028 | 1.81 | 0.27 | 0.010 | 0.0015 | 0.0019 | 0.0018 | ---- | 722 | Comparative example 1 |
| 4 | 0.0028 | 1.81 | 0.27 | 0.010 | 0.0015 | 0.0019 | 0.0018 | 0.050 | 680 | Comparative example 2 |
Table 2 electrical steel steel plate magnetic property
| Sequence number | P 15/50(W/Kg) | B 50(T) | u1.0(Gs/Oe) | Remarks |
| 1 | 3.124 | 1.75 | 6954 | Example 1 |
| 2 | 3.148 | 1.75 | 6832 | Example 2 |
| 3 | 3.358 | 1.72 | 5786 | Comparative example 1 |
| 4 | 3.379 | 1.73 | 6042 | Comparative example 2 |
As mentioned above, according to this invention, obtain high magnetic permeability and the low non-oriented electromagnetic steel sheet of iron loss can fully adapt to high performance or the high efficiency along with motor, to the non-oriented electromagnetic steel sheet requirement as its core material.
Above the present invention is exemplarily described; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method of the present invention design and technical scheme to carry out, or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. a production method for electrical sheet, is characterized in that, comprises the steps:
(1) molten steel converter smelting;
(2) RH refining;
(3) CSP;
(4) normalizing pickling;
(5) single stand cold mill;
(6) continuous annealing.
2. the production method of electrical sheet as claimed in claim 1, is characterized in that, also comprises the steps:
(7) coating;
(8) finishing.
3. the production method of electrical sheet as claimed in claim 1 or 2, is characterized in that, in step (3), the finishing temperature of hot rolling is at 840～900 ℃, and coiling temperature is not less than 700 ℃.
4. the production method of the electrical sheet as described in any one in claim 1-3, it is characterized in that, in step (1)-(3), molten steel continuous casting after smelting, refining becomes the thin slab of thickness 60～90mm, and thin slab heats without the cooling process furnace that directly enters.
5. the production method of electrical sheet as claimed in claim 4, is characterized in that, in step (3), the temperature of process furnace is at 1050～1160 ℃, and be 0.5～3.5h heat-up time; Through hot rolling, make again the hot-rolled sheet of 2.0～2.5mm thickness.
6. the production method of the electrical sheet as described in claim 4 or 5, it is characterized in that, the chemical component weight per-cent of described thin slab: 1.50%≤Si≤2.50%, 0.30%≤Al≤1.00%, 0.10%≤Mn≤2.00%, 0.010%≤Sn≤0.100%, and, the total amount of Si and Al is Si+2Al >=2.00%, C≤0.0030%, N≤0.0020%, S≤0.0030%, Ti≤0.0030%, Nb≤0.0030%, V≤0.0050%, As≤0.0030%, residuals is that Fe and inevitable inclusion form.
7. the production method of the electrical sheet as described in any one in claim 1-6, is characterized in that, in step (4), normalizing thermal treatment temp is at 900～1100 ℃, and soaking time is at 1～5min.
8. the production method of the electrical sheet as described in any one in claim 1-7, is characterized in that, in step (4), and the steel plate after normalizing thermal treatment, through ball blast pickling, pickling temperature is controlled at 70～90 ℃.
9. the production method of the electrical sheet as described in any one in claim 1-8, is characterized in that, in step (5), and cold rolling employing 5 passage rollings on single chassis reversable mill after pickling, cold rolling total reduction is 75～80%.
10. the production method of electrical sheet as claimed in any one of claims 1-9 wherein, is characterized in that, in step (6), annealing is carried out in continuous annealing furnace, annealing temperature is 800～950 ℃, and soaking time is 1～4min, and in stove, dew point is controlled at 10～35 ℃; And/or,
In step (5)-(6), single chassis tandem rolling is rolled to 0.5mm thickness, finally by continuous annealing, coating and make the electrical steel strip finished product of 0.5mm thickness.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789860A (en) * | 2015-05-07 | 2015-07-22 | 马钢(集团)控股有限公司 | Electrical steel and production method thereof |
| CN104831037A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | Low-iron-loss semi-processed cold-rolled non-oriented electrical steel and manufacturing method thereof |
| CN106011655A (en) * | 2016-08-08 | 2016-10-12 | 浙江华赢特钢科技有限公司 | High efficiency silicon steel normal substrate production method |
| CN106676237A (en) * | 2016-12-14 | 2017-05-17 | 北京首钢股份有限公司 | Method for eliminating non-oriented electrical steel surface crack defects |
| CN106756522A (en) * | 2017-03-21 | 2017-05-31 | 马钢(集团)控股有限公司 | The low iron loss of one kind production, high-magnetic strength non-oriented electrical steel and its manufacture method |
| CN107034415A (en) * | 2017-03-31 | 2017-08-11 | 马鞍山钢铁股份有限公司 | A kind of non-oriented electrical steel and its production method |
| CN107208171A (en) * | 2015-02-24 | 2017-09-26 | 杰富意钢铁株式会社 | The manufacture method of non orientation electromagnetic steel plate |
| CN114737129A (en) * | 2022-03-02 | 2022-07-12 | 新余钢铁股份有限公司 | High-performance non-oriented silicon steel for wound motor iron core and production method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208171A (en) * | 2015-02-24 | 2017-09-26 | 杰富意钢铁株式会社 | The manufacture method of non orientation electromagnetic steel plate |
| US10316382B2 (en) | 2015-02-24 | 2019-06-11 | Jfe Steel Corporation | Method for producing non-oriented electrical steel sheets |
| CN104789860A (en) * | 2015-05-07 | 2015-07-22 | 马钢(集团)控股有限公司 | Electrical steel and production method thereof |
| CN104831037A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | Low-iron-loss semi-processed cold-rolled non-oriented electrical steel and manufacturing method thereof |
| CN106011655A (en) * | 2016-08-08 | 2016-10-12 | 浙江华赢特钢科技有限公司 | High efficiency silicon steel normal substrate production method |
| CN106676237A (en) * | 2016-12-14 | 2017-05-17 | 北京首钢股份有限公司 | Method for eliminating non-oriented electrical steel surface crack defects |
| CN106756522A (en) * | 2017-03-21 | 2017-05-31 | 马钢(集团)控股有限公司 | The low iron loss of one kind production, high-magnetic strength non-oriented electrical steel and its manufacture method |
| CN107034415A (en) * | 2017-03-31 | 2017-08-11 | 马鞍山钢铁股份有限公司 | A kind of non-oriented electrical steel and its production method |
| CN114737129A (en) * | 2022-03-02 | 2022-07-12 | 新余钢铁股份有限公司 | High-performance non-oriented silicon steel for wound motor iron core and production method thereof |
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